Search related to Centos

FFmpeg on CentOS

This article will guide you on how to install FFMPEG on #CentOS and fix its related #errors. FFmpeg is a powerful tool that can do almost anything with #multimedia files.

FFmpeg is a standard package on many #linux systems. 

You can check if it is installed with a #command like dpkg -s ffmpeg . 

If it is not installed, you should be able to install with your system's package manager. i.e. sudo apt-get install ffmpeg or search 'ffmpeg' in the Software Center on Ubuntu.

To run #FFmpeg in #Linux:

1. Start by updating the packages list: sudo apt update.

2. Next, install FFmpeg by typing the following command: sudo apt install ffmpeg.

3. To validate that the package is installed properly use the ffmpeg -version command which prints the FFmpeg version: ffmpeg -version. 

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Enable FirewallD logging for denied packets on Linux

This article will guide you on how to enable #FirewallD logging for denied packets on #Linux. It is an important task to keep an eye on the rejected and dropped packets using FirewallD for #Linux system administrators. 

To enable logging option you need to use #LOG iptables/kernel module. It turn on kernel logging of matching packets. When this option is set for a rule, the Linux kernel will print some information on all matching packets (like most IP header fields) via the kernel log.

To log a dropped packet in iptables:

1. iptables -N LOGGING: Create a new chain called LOGGING.

2. iptables -A INPUT -j LOGGING: All the remaining incoming packets will jump to the LOGGING chain.

3. line#3: Log the incoming packets to syslog (/var/log/messages).

To  restart iptables:

i. To start firewall from a shell enter: # chkconfig iptables on. # service iptables start.

ii. To stop firewall, enter: # service iptables stop.

iii. To restart #firewall, enter: # service iptables restart.

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Memcached DDOS attack

This article will guide you on methods to mitigate Memcached DDOS attacks which occur mostly by accident. To mitigate this attack, you can Disable #UDP, #Firewall #Memcached servers, and so on.

 DoS attack is a denial of service attack where a computer is used to flood a server with TCP and UDP packets. A DDoS attack is where multiple systems target a single system with a DoS attack. The targeted network is then bombarded with packets from multiple locations.

DDoS attacks are illegal under the Computer Fraud and Abuse Act. Starting a DDoS attack against a network without permission is going to cost you up to 10 years in prison and up to a $500,000 fine.

There are three essential security measures that all small businesses should take to protect themselves from #DDoS #attacks: Use a web application firewall (#WAF): The absolute best way to prevent a DDoS attack is through the use of a WAF that blocks bad traffic and prevents DDoS attacks from accessing your web server.

A Denial-of-Service (#DoS) attack is an attack meant to shut down a machine or network, making it inaccessible to its intended users. DoS attacks accomplish this by flooding the target with traffic, or sending it information that triggers a crash.

Different DDoS attack method:

1. UDP flood.

2. ICMP (Ping) flood.

3. SYN flood.

4. Ping of Death.

5. Slowloris.

6. NTP Amplification.

7. HTTP flood.

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Install SQL Server 2019 on Linux

This article will guide you the process to install #MSSQL Server 2019 on #CentOS 7 and Ubuntu 16.04.

SQL Server 2019 #Developer is a full-featured free edition, licensed for use as a development and test database in a non-production environment.

SQL Server 2019 allows us to integrate data from structured and unstructured data sources. 

We can now process diverse big data and relational data sources using Transact-SQL from SQL Server using PolyBase. 

We can see below PolyBase support external databases.

SQL Server Express can be used in production (beware of the limitations, like the 10GB cap), but according to this link Express is available for Linux. SQL Server Express is available to use in Production.

Starting with SQL Server 2017, SQL Server runs on Linux. It's the same SQL Server database engine, with many similar features and services regardless of your operating system. It's the same SQL Server database engine, with many similar features and services regardless of your operating system.

To run a SQL script in #Linux terminal:

1. Open Terminal and type mysql -u to Open the MySQL command line.

2. Type the path of your #mysql bin directory and press Enter.

3. Paste your #SQL file inside the bin folder of mysql server.

4. Create a #database in MySQL.

5. Use that particular database where you want to import the SQL file.

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Install WireShark CentOS

This article will guide you on how to install WireShark on #CentOS. WireShark is one of the leading #network analyzing tools. It helps in troubleshooting the traffic problems of a server and malicious activity. 

Wireshark is an open-source, free network packet analyzer, used to capture and analyze network traffic in real-time.

Basically, with Wireshark you can capture and view data traveling through your network.

You can install WireShark with yum install wireshark-gnome . 

After you install it, the Wireshark application will be at /usr/sbin/wireshark .

To install #wireshark on RHEL 8 / CentOS 8 Linux step by step instructions:

1. Install package called Whireshark using the dnf command. For a GUI Wireshark application execute: # dnf install wireshark To install Wireshark command line tool only execute: # dnf install wireshark-cli.

2. Launch Wireshark.

To install Wireshark from #terminal:

Open terminal and type the #commands:

i. sudo apt-get install wireshark.

ii. sudo dpkg-reconfigure wireshark-common.

iii. sudo adduser $USER wireshark.

iv. wireshark.

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Monitor System Metrics with the TICK Stack on CentOS 7

This article will guide you on how the TICK stack can be a powerful tool for storing, analyzing, and visualizing time series data. To monitor InfluxDB _internal metrics in a production #cluster, use Telegraf and the influxdb input plugin to capture these metrics from the InfluxDB /debug/vars endpoint and store them in an external InfluxDB monitoring instance.

More about Kapacitor:

#Kapacitor is a native data processing engine for #InfluxDB 1. x and is an integrated component in the InfluxDB 2.0 platform. 

Kapacitor can process both stream and batch data from InfluxDB, acting on this data in real-time via its programming language TICKscript.

A retention policy (RP) is the part of InfluxDB data structure that describes for how long InfluxDB keeps data. 

InfluxDB compares your local server's timestamp to the timestamps on your data and deletes data that are older than the RP's DURATION . 

A single database can have several RPs and RPs are unique per database.

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OpenVPN on Linux

This article will guide you on steps to set up OpenVPN on Linux.

OpenVPN config files (. ovpn) offer an easy way to configure #OpenVPN on your computer to work with our servers. These files contain the correct cipher types, #Certificate Authority, Certificate, and Private Keys. You can use these files on Mac, Linux, #Windows, Android, and iOS.

By default the OpenVPN Access Server comes configured with OpenVPN daemons that listen on port 1194 UDP, and OpenVPN daemons that listen on port 443 TCP. While the best connection for an OpenVPN #tunnel is via the #UDP port, we implement TCP 443 as a fallback method.

To Set up OpenVPN Server on Ubuntu #Linux:

1. Find and note down your public IP address.

2. Download openvpn-install.sh script.

3. Run openvpn-install.sh to install OpenVPN server.

4. Connect an OpenVPN server using iOS/Android/Linux/Windows client.

5. Verify your connectivity.

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WordPress Brute Force Attack

This article will guide you on Brute Force Attack and different ways to troubleshoot and fix a Brute-Force Attack in #WordPress.

Brute-force attacks work by calculating every possible combination that could make up a password and testing it to see if it is the correct password. 

As the password's length increases, the amount of time, the computational power required on average, to find the correct password increases exponentially.

#Brute #Force #Attack Prevention Techniques:

1. Limit failed login attempts.

2. Make the root user inaccessible via #SSH by editing the sshd_config file.

3. Don't use a default port, edit the port line in your sshd_configfile.

4. Use Captcha.

5. Limit logins to a specified IP address or range.

6. Two factor authentication.

7. Unique login URLs.

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Nagios migration to new Linux server

This article will guide you on steps to #migrate Nagios server to a new Linux server. Nagios provides complete monitoring of #applications and application state – including #Windows applications, #Linux applications, #UNIX applications, and #Web applications.

Main benefits of #Nagios:

1. Increased server, services, process, and application availability.

2. Fast detection of network and server outages and protocol failures.

3. Fast detection of failed servers, services, processes and batch jobs.

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Automate Windows Server 2019 Administration with Ansible

This article will guide you on steps to automate Windows Server 2019 #Administration with Ansible. 

Ansible can be used to manage and execute core functions in Windows #environments, from security updates to remote management using #WinRM. Although Ansible must be run on #Linux, Windows administrators can use Ansible to manage and automate their systems without needing to know how to use a Linux #terminal.

To Connect Ansible on Windows from #Ubuntu:

1. Create Ansible Windows User. Create a new user for the Ansible windows connection setup.

2. Setup Libraries and WinRM.

3. Update the Ansible Inventory file.

4. Update the Ansible Group Variables.

5. Configure #Windows Servers to Manage.

6. Test Connectivity to the Windows Server.

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GlusterFS install CentOS 7

This article will guide you on the steps to install and setup #GlusterFS. 

GlusterFS is a scalable #network filesystem suitable for data-intensive tasks such as cloud storage and media streaming. 

GlusterFS has a client and #server component. Servers are typically deployed as storage bricks, with each server running a glusterfsd daemon to export a local file system as a #volume.

To install GlusterFS:

1. Have at least two nodes. CentOS 7 on two servers named "server1" and "server2".

2. Format and mount the bricks.

3. Installing GlusterFS.

4. #Iptables configuration.

5. Configure the trusted pool.

6. Set up a GlusterFS volume.

7. Testing the GlusterFS volume.

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Enable firewalld in Centos 7 How to do it

This article will guide you on steps to enable firewalld on #centos 7 servers for our customers. The firewall is one of the most important features of webservers. The #firewalld supports both IPv4 and IPv6 #firewall #settings.

Never run the iptables service and FirewallD service at the same time! The #iptables service is now provided by a separate package called iptables-services: Stop and disable the firewalld service first. # systemctl stop firewalld.

The firewalld daemon manages groups of #rules using entities called "zones". Zones are basically sets of rules dictating what traffic should be allowed depending on the level of trust you have in the networks your #computer is connected to.

To use FirewallD:

1. Installing and Managing FirewallD.

2. To start the service and enable FirewallD on boot: sudo systemctl start firewalld sudo systemctl enable firewalld.

3. Check the firewall status.

4. To view the status of the FirewallD daemon: sudo systemctl status firewalld.

5. To reload a FirewallD configuration: sudo firewall-cmd --reload.

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Install imagemagick on CentOS

This article will guide you on steps to #install #ImageMagick and fix its errors. Basically, ImageMagick is used to manipulate the digital images.

ImageMagick helps to create, edit, compose, or convert #bitmap images. It can read and write images in a variety of formats (over 200) including #PNG, JPEG, GIF, HEIC, TIFF, DPX, EXR, WebP, Postscript, PDF, and #SVG.

To install ImageMagick from the source:

1. First #download the latest version of the program sources - ImageMagick.

2. Unzip the package to a folder of choice.

3. In the folder where you have unzipped ImageMagick run the configuration script.

4. If no errors were found, you can start the install process.

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Install Froxlor on CentOS 7

This article will guide you on steps to #install Froxlor on #CentOS 7 and also resolve common Froxlor #errors.
#Froxlor is a simple but powerful server administration #software for managing #domains, emails and files.
To install Froxlor web hosting control panel:
1. Ensure that your webserver serves /var/www.
2. Extract froxlor into /var/www.
3. Point your browser to http://[ip-of-webserver]/froxlor.
4. Follow the #installer.
5. Login as #administrator.
6. Adjust "System > Settings" according to your needs.
7. Choose your distribution under "System > Configuration".
8. Follow the steps for your services.

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Content Encoding Error content_encoding_error

This article will guide you on steps to resolve #Content #Encoding #Error (content_encoding_error) which makes the server returns a #gzip compressed object, but the content is actually text.
The  cause of this error message is a #web server whose #HTTP response headers indicate that it will be responding with one type of encoding, but instead responds with a different type of encoding. For example, what is commonly seen is that a web server returns a gzip compressed object, but the content is actually text.

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List installed software Linux

This article will guide you on different methods to #list all #software, the number of #packages available on the server along with the method to copy them and use them when we reinstall our operating system(#OS).
Yum automatically refreshes the list of packages, whilst with apt-get you must execute a command 'apt-get update' to get the fresh packages.
To list of installed programs in #Linux:
1. Aptitude-based distributions (#Ubuntu, #Debian, etc): dpkg -l.
2. RPM-based distributions (#Fedora, #RHEL, etc): rpm -qa.
3. pkg*-based distributions (#OpenBSD, #FreeBSD, etc): pkg_info.
4. Portage-based distributions (#Gentoo, etc): equery list or eix -I.
5. pacman-based distributions (Arch Linux, etc): pacman -Q.

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Add Glance Cloud images to OpenStack

This article will guide you on steps to add #Glance #Cloud images to #OpenStack with different #Linux distributions which enables users to discover, register, and retrieve virtual machine images. 

After images are created they should be registered in Openstack Glance - #image operation service.

Upload Image Into Glance:

1. Replace <NAME> with the name that users will refer to the disk image by. 

2. Replace <IMAGE_FILE> with the local path to the image file to upload.

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Cant locate LWP UserAgent pm in @INC

This article will guide you on how to get rid of error "Can't locate LWP/UserAgent.pm in @INC" which occurs in the process of installing #applications like CSF in the DirectAdmin server or any other #Linux #distros. 

libwww-perl (also known as LWP) is a collection of #Perl #modules that provide a simple and consistent programming interface (API) to the World-Wide Web.

In order to install and use this #package you will need Perl version

5.8.1 or better:

Some modules within this package depend on other packages that are distributed separately from Perl.  We recommend that you have the following #packages installed before you install

libwww-perl:

i. Digest-MD5

ii. Encode-Locale

iii. HTML-Form

iv. HTML-Parser

v. HTML-Tagset

vi. HTTP-Cookies

vii. HTTP-Date

viii. HTTP-Message

ix. HTTP-Negotiate

x. libnet

xi. LWP-MediaTypes

xii. MIME-Base64

xiii. Net-HTTP

xiv. URI

xv. WWW-RobotRules


If you want to access sites using the https protocol, then you need to

install the LWP::Protocol::https module from CPAN.

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Install Graylog on CentOS 7 How to do it

This article will guide you on steps to #Graylog on #CentOS 7 and an effective method to make the logs more structured and searchable.

Graylog is a leading centralized log management solution built to open standards for capturing, storing, and enabling real-time analysis of terabytes of #machine data. 

Graylog is an open source log management platform which enables you to aggregate up to terabytes of log data, from multiple log sources, DCs, and geographies with the capability to scale horizontally in your data center, #cloud, or both.

To #Install Graylog 3 with Elasticsearch on CentOS 7:

1. Configure #SELinux. 

2. Add required #repositories 

3. Install #Java, #Elasticsearch, and #MongoDB. 

4. Configure Elasticsearch for Graylog. 

5. Install Graylog 3 on CentOS 7. 

6. Start Graylog service on CentOS 7.

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Backup and Restore Nagios Log Server

This article will guide you on the steps to perform #backup and #restore a #Nagios #Log #Server cluster. Taking Backup and Restore of Nagios Log Server helps not to lose any data as it is held in other instances.

Backup and recovery describes the process of creating and storing copies of #data that can be used to protect organizations against data loss. #Recovery from a backup typically involves restoring the data to the original location, or to an alternate location where it can be used in place of the lost or damaged data.

To do a backup and system restore:

1. Click Start.

2. Go to Control Panel.

3. Go to System and Security.

4. Click Backup and Restore.

5. At the Back up or restore your files screen, click Restore my files. 

6. Browse to locate the backup file. 

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Steps to Deploy Virtual Machines in RHEV Environment

This article will guide you on how to #deploy #virtual #machines in the #RHEV environment and also on #Linux and #Windows virtual machines.

A Virtual Machine (#VM) is a compute resource that uses software instead of a physical computer to run programs and deploy apps. One or more virtual "guest" #machines run on a physical "host" machine.

The main purpose of VMs is to operate multiple operating systems at the same time, from the same piece of hardware. Without virtualization, operating multiple systems — like Windows and Linux — would require two separate physical units.

The two basic types of virtual machines are process and system VMs:

1. A process virtual machine allows you to run a single process as an application on a host machine. 

2. A system virtual machine is a fully virtualized #VM designed to be a substitute for a physical machine.

Your virtual machine internet connection goes through your computer and through your router. So they can track your router's #IP address, and possibly track you down at least to your city, if not to individual street or house.

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Install InfluxDB on CentOS 7

This article will guide you on steps to Install #InfluxDB on #CentOS 7. You can Turn any InfluxData #instance into a production-ready cluster that can run anywhere. Easily create and share a comprehensive monitoring solution.

InfluxDB is similar to a #SQL #database, but different in many ways. Relational databases can handle time series data, but are not optimized for common time series workloads. InfluxDB is designed to #store large volumes of time series data and quickly perform real-time analysis on that data.

The local InfluxDB configuration file is located here: Linux: /etc/influxdb/influxdb. conf. macOS: /usr/local/etc/influxdb.

To Install InfluxDB:

Option 1 : Download the InfluxDB archive via the browser.

Option 2 : Adding the #repositories to your package manager.

i – Start your InfluxDB service.

ii – Configure your InfluxDB instance.

iii – Test your InfluxDB instance.

iv – #Download InfluxDB 2.0 archive from the website.

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Plesk Multi Server How to install it

This article will guide you on how to install #Plesk #Multi #Server which will enable us to work with a single Plesk user interface to run hosting services on multiple #servers. A multi-server environment can support more #connections and services, helps to keep the system running, and can also cost significantly less each month than continually adding resources to a single server.

Plesk Multi Server is most useful for the following types of business:

1. Web design and development studios that also host the clients web sites;

2. Small and medium-sized shared hosting providers;

3. Larger hosting providers for #reselling to customers, who are small and medium-sized shared #hosting #providers.

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Apache Performance Tuning via MPM Directives

This guide will help you to configure #MPM directives in the #Apache server. You can simply configure MPM #directives by logging into the server and create an optimization file and add the necessary directive change. 

Starting with Apache 2.0, Apache extended its features with a selection of Multi-Processing Modules (#MPMs), which are responsible for binding to #network ports on the machine, accepting and handling the requests. These modules determine the basis of how Apache addresses multi-processing.

To know which MPM Apache is using:

1. Enable Apache mod_info.

2. Query the mod_info url, typically curl localhost/server-info.

3. The "Server Settings" section will show "MPM Name: #Worker"

4. Run httpd -V again. It will still show prefork, not worker.

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How to Install OpenNMS on CentOS 8

This article will guide via a step-by-step procedure to #install OpenNMS in #CentOS. 

OpenNMS is a free, Open Source network monitoring system that can be used to #monitor tens of thousands of unlimited devices with a single #instance.

It will discover and monitor the services or nodes automatically in your #network, or you can assign a particular service to monitor by OpenNMS.

To configure #OpenNMS:

1. Install OpenNMS Horizon. Add yum repository and import GPG key. 

2. Initialize and set up #PostgreSQL. Initialization of the PostgreSQL database will start.

3. Initialize and start OpenNMS Horizon. 

4. First Login and change default password.

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Pure-ftpd 530 login authentication failed error on Directadmin

This article will guide you how to resolve Pure-ftpd 530 login #authentication failed #error on #DirectAdmin which occurs as a result of incorrect ownership of pureftp.passwd file or password #database corruption.

While trying to connect to your FTP server hosted by #IIS, you may run into “530 User cannot log in, home directory inaccessible” error. This error occurs whether you are using anonymous access or basic authentication. A sample connection log from an FTP #client: 530 User cannot log in, home directory inaccessible.

To Install Pure-FTPd on Ubuntu 20.04 :

1. Create Atlantic.Net Cloud Server. First, log in to your Atlantic.Net Cloud Server. 

2. #Install Pure FTPd. 

3. Create #FTP User. 

4. Create a Self-signed SSL/TLS certificate. 

5. Configure Pure FTPd to use SSL/TLS. 

6. Connect FTP Server from Client.

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oVirt Guest Agent on CentOS 8 and RHEL 8 Steps to install

This article will guide you on how to install oVirt Guest Agent on CentOS and RHEL. oVirt / #RedHat V#irtualization guest agent provides information, notifications, and actions between the #oVirt web interface and the guest.

To install oVirt guest agent:

1. Log in to the Red Hat Enterprise Linux virtual machine.

2. Enable the Red Hat Virtualization Agent #repository.

3. Install the guest #agent and #dependencies: # yum install ovirt-guest-agent-common.

4. Start and enable the ovirt-guest-agent service.

5. Start and enable the qemu-guest-agent service.

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NFS Server on RHEL CentOS 8 Steps to install and configure

This article will guide you on the steps to Install and Configure #NFS Server on #RHEL or #CentOS.

The terms client and server are used to describe the roles that a computer plays when sharing file systems. The NFS service enables any given computer to access any other computer's file systems and, at the same time, to provide access to its own file systems.

To install NFS server:

1. Install NFS #Kernel Server. 

2. Create the #Export #Directory. 

3. Assign server access to client(s) through NFS export file. 

4. Export the shared directory. 

5. Open #firewall for the client (s).

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Backup MariaDB Databases to Linode Object Storage with Restic

This article will guide you on how to backup #MariaDB Databases to #Linode Object Storage which helps in restoration in the event of a server fault, a user #error, or a hacking or defacing of #website or #applications.

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Zabbix Single Sign-On SSO Authentication in Active Directory

This article will guide you on how to set #Zabbix : Single Sign-On (#SSO) Authentication in #Active Directory which helps users authenticate the Zabbix frontpage without entering credentials.
Users and resources are added to the directory service for central management and ADDS works with authentication protocols like #NTLM and #Kerberos. Thus, users that belong to ADDS can authenticate from their #machines and get access to others #systems that integrate with ADDS. This is a form of Single Sign-on.

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Using Cron to Automate Tasks on CentOS 8

This article will guide you on the steps to set up #Cron job on #CentOS 8 to help automate #tasks. Cron is a #clock daemon, whose name originates from #Chronos, the Greek word for time. It enables users to automate the execution of #commands, scripts (a group of commands) or programs at specified time intervals.
The simplest way to validate that cron tried to run the #job is to simply check the appropriate log file; the log files however can be different from system to system. In order to determine which log file contains the cron #logs we can simply check the occurrence of the word cron in the log files within /var/log .

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Nagios Authentication and Importing Users with AD and LDAP

This article will guide you on how to integrate #Nagios Log Server with Active Directory or #LDAP to allow user authentication and validation with the Nagios Log Server interface.
Currently by default LDAP traffic (without SSL/TLS) is unsigned and unencrypted making it vulnerable to man-in-the-middle attacks and eavesdropping. After the patch or the windows update would be applied, LDAPS must be enabled with Active Directory.
To Set up Active Directory Authentication using LDAP:
1. Enter the LDAP "Server" and "Port" attributes on the Server Overview tab of the LDAP Users page.
2. Enter the proper base for the Active Directory in the "Base DN" attribute.
3. Set the Search Scope.
4. Enter the Username Attribute.
5. Enter the Search Filter.
6. Verify that the settings are correct by clicking the Verify button.

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Monitoring VMware with Nagios XI

This article will guide you on the steps to Monitor VMware with #Nagios.
To Monitor the VMware host
i. Enter the Address, Username and Password of your #ESX / #ESXi host.
ii. Select Monitor the #VMware #Host.
iii. Click Next to go to Step 2.
iv. On step 2 you will configure all of the options for #monitoring.

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Send Syslog with SSL TLS to Nagios Log Server

This article will guide you on how to Send #Syslog with #SSL / #TLS to Nagios Log Server by encryption which ensures that the #traffic between the #Linux machine and Nagios Log Server is not sent in plain text.

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How to install Metricbeat on CentOS 7 to Gather Infrastructure Metrics

This article will guide you on the steps to install #Metricbeat and configure the Elastic Stack to collect and analyze system metrics. Metricbeat is configured using a #YAML configuration file. On Linux, this file is located at: /etc/metricbeat/metricbeat. yml. On #Docker, you will find it at: /usr/share/metricbeat/metricbeat.
Both #Filebeat and #Logstash can be used to send #logs from a file-based data source to a supported output destination.

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Steps to Edit Sudoers File in Linux Process to get it done

This article will guide you on how to edit #Sudoers File in Linux which involves #root privileges, with a special focus on editing the /etc/sudoers file. You can configure who can use #sudo #commands by editing the /etc/sudoers file, or by adding configuration to the /etc/sudoers. To edit the sudoers file, we should always use the #visudo command. This uses your default editor to edit the sudoers configuration.

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HAProxy Logging with Rsyslog on CentOS 8

This article will guide you on how to set up #HAProxy Logging #Rsyslog with some quick and easy steps. HAProxy is installed with RightScale load #balancer ServerTemplates. Load-balancer servers are also known as front-end servers. Generally, their purpose is to direct users to available #application servers. HAProxy can be installed in front of them to provide load balancing and high availability.

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Modify Data Store Path in Nagios Log Server

This article will guide you on the process to modify the data #storage location in a #Nagios #Log #Server.

The Nagios Core log, includes checks, notifications, external #commands, and events. This file is rotated daily into the /usr/local/nagios/var/archives folder by default setting in nagios.

Changing Data Path In Nagios Log Server involves: 

DATA_DIR="$ES_HOME/data" Modify it to the new path you would like to use: DATA_DIR="/new/path/data" Save the file and exit vi. The time it takes to move your existing data will vary depending on how much data there is and the speed of the source and destination #paths.

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Using Bpytop to monitor Linux and FreeBSD Resources

This article will guide you on how to use Bpytop Monitoring for Linux & FreeBSD Resources.

#Bpytop is a great utility which is useful on your #Linux, #macOS, and #FreeBSD as a #resource #monitor. It is much faster than bashtop and works pretty well as Python 3 is standard on many Unix boxes.

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Steps to create a Self-Signed SSL Certificate for Apache in CentOS 8

This article will guide you on how to configure #Apache to serve encrypted requests using a self-signed SSL certificate and to redirect unencrypted HTTP requests to #HTTPS. Self-signed #certificates or certificates issued by a private CAs are not appropriate for use with the general public. It can only properly verify the identity of the server when it is signed by a trusted third party because any attacker can create a self-signed certificate and launch a man-in-the-middle attack.

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Send NXLogs with SSL TLS to Nagios Log Server

This guide will guide you on how to send NXLogs with SSL/TLS to #Nagios #Log #Server. Encryption ensures that the traffic between the #Windows machine and Nagios Log Server is not sent in plain text.

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Cloning existing KVM virtual machine images on Linux

This article will guide you on how to use the virt-clone command which provides a number of options to clone a #KVM #VM. You can use the virt-sysprep if you need to clone the VM and make/reset anything inside the guest #OS.

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Deploy Zimbra Collaboration using docker

This article will guide you on the steps to run #Zimbra on #Docker #Container. Docker enables apps to quickly assemble from components.

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Installation and Configuration of ClamAV

This article will guide you on the steps to install #Clam #AntiVirus which is an open-source #antivirus tool to detect many types of #malicious #software, including #viruses. 

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Install and configure Grafana on CentOS 7

This article will guide you on the steps to #install #Grafana on #CentOS 7 which is a #visualization and #analytics #monitoring software. Grafana is Free and Open Source which Runs on all major #OS operating systems.

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Step by step process to Secure Apache with Lets Encrypt on CentOS 8

This article will guide you on the process to secure #Apache with Let’s Encrypt by installing Let's Encrypt #Certbot client, downloading #SSL #certificates for the #domain, and setting up automatic certificate renewal.

The objective of Let's Encrypt and the #ACME protocol is to make it possible to set up an #HTTPS server and have it automatically obtain a browser-trusted certificate, without any human intervention.

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Monitoring squid proxy server with Nagios log server

This article will guide you on how to configure the #Nagios log server to use a #proxy server.

#Squid is a caching and forwarding #HTTP web proxy. It has a wide variety of uses, including speeding up a web server by caching repeated requests, #caching web, #DNS and other computer network #lookups for a group of people sharing network resources, and aiding security by filtering #traffic.

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How To Troubleshoot Common HAProxy Errors

This article will guide you on the different methods to #troubleshooting and fix common #HAProxy errors which can range from diagnosing #errors with the service itself to locating misconfigured options for modules. 

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ifconfig centos 7

This article will guide you on the steps to #install #ifconfig in #CentOS using the yum #package #manager.

The ifconfig command can tell you a lot about your Unix server's connection to your #network and the role it's playing in both generating and receiving network traffic.

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Install Prometheus Network Monitoring Server on CentOS 7

#Prometheus collects metrics from targets by scraping 3metrics #HTTP endpoints. Since Prometheus exposes #data in the same manner about itself, it can also scrape and monitor its own health. 

This article will guide you on the steps to perform #installation of Prometheus on #CentOS 7 along with the method used for the #setup.

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Debugging Bandwidth Performance Graphs in Nagios

This article will guide you through the steps to perform #debugging of #bandwidth #performance #graphs in #Nagios.

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Sync Two CentOS 8 Servers Using File Replication

The #sync command forces an immediate write of all cached data to disk. Run sync if you anticipate the system to be unstable, or the storage device to become suddenly unavailable, and you want to ensure all data is written to disk. Individual files may be synced, or the entire filesystem containing the specified files.

This article will guide you on the right steps to sync two #CentOS 8 #servers using file replication.

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Backup, Restore and Migrate a MongoDB database on CentOS 8

MongoDB is highly scalable, using shards. Horizontal scalability is a big plus in most #NoSQL databases. MongoDB is no exception. It is also highly reliable due to its replica sets, and the data is replicated in more nodes asynchronously.

This article will guide you on the steps to perform #backup, #restore and #migrate a #MongoDB #database on #CentOS 8.

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Logs Not Searchable or Not Coming In Nagios Log Server

This article will guide you in solving #Logs Not Searchable or Not Coming In #Nagios Log #Server which occurs in the process of running a query in the Nagios dashboard.

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Crashed Database Tables in Nagios XI

This article will guide you through the steps to fix Crashed #Database #Tables in #Nagios which occurs if the #MySQL process appears to be consuming large amounts of #CPU.

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Facts about Apache Thrift

Thrift can be set up to use HTTP and JSON pretty easily if you want it (say if your client is somewhere on the internet and needs to pass firewalls) Thrift supports persistent connections and avoids the continuous TCP and HTTP handshakes that HTTP incurs.

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RAM Disk in Nagios XI

This article will guide you on how to make use of a RAM disk can provide huge performance improvements on larger systems or any system where check latencies are greater than 2 seconds.

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Different methods to List Users in CentOS 7

This article will guide you on the different methods to list users in CentOS 7.

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Nagios Log Server To Monitor A New Log Source

This article will guide you through the steps to need to take to configure Nagios log server to monitor a new log source.

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Virtualmin common Website errors

This article will guide you on the steps to troubleshoot common website errors in Virtualmin.

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Virtualmin common installation errors

This article will guide you on the different common errors in Virtualmin / Webmin and their fixes.

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Install Squid Proxy on CentOS 7

This guide will show you the steps to install squid on Centos 7 as well as configure the port and adjusting the access control list.

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Install DHCP Server Client on Centos

This article will guide you on the steps to install and configure a DHCP server on CentOS 8.

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OpenStack instance Creation

This tutorial is all about assigning a fixed static IP address in OpenStack by creating ports and adding them to the instance.

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Using Ansible to copy MySQL databases

This article will guide us on how to perform database migration using Ansible as the controller which can help to copy a MySQL database from one remote server to another.

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Major effects of shifting focus to CentOS Stream

This article is about the major effects of shifting focus to the CentOS Stream which is a sudden move by Red Hat.

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Install Kamailio SIP proxy server on CentOS 7 in a few steps

This article will guide you on the steps to install and configure Kamailio sip proxy on CentOS.

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Configuration File Is Out Of Date in Nagios

This article will guide you on the different methods to fix Nagios error "Configuration File Is Out Of Date" in CCM after applying configuration changes in Nagios due to incorrect configuration of system time.

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Zimbra firewall configuration with UFW and firewalld How to set it up

This article will help you to configure Zimbra firewalls with UFW and firewalld.

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Nagios login screen redirects to itself Steps to fix it

This article will help to resolve Nagios login screen redirecting to itself which occurs due to a mismatch in the time zone can cause the Nagios login screen to redirects to itself after entering the login credentials.

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Hyper V VM Boot Error The Image Hash and Certificate Are not Allowed DB

This guide will help to fix the error "image's hash and certificate are not allowed (DB)" which generally occurs while trying to install Linux CentOS on a virtual machine running on a Hyper-V server.

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Install Nagios XI in an offline environment

This article will guide you on how to install Nagios XI in an offline environment using powershell.

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Troubleshooting Common Virtualmin email errors

This article will guide you on the different tips to resolve email errors in Virtualmin are mostly triggered by failure of the components of its mail system.

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Zimbra zmconfigd not running starting Tips to fix it

This article will help to fix "zmconfigd not running/starting" issue which results from factors such as such as  missing netcat (nc) command, Pid issue of zimbra and so on.

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Steps to install OpenLiteSpeed on CentOS

This article will guide you on how to perform installation of OpenLiteSpeed on Centos Server.

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TigerVNC Server installation and configuration

This article will guide you on how to install TigerVNC server CentOS 7.

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Steps to Install Terraform On Ubuntu

This guide will show you how to install terraform on CentOS 7/Ubuntu 18.04.

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Smartctl installation and configuration

This article will guide you on how to install and configure Smartctl which is a Monitoring and Analysis tool for Hard drive which helps to detect any potential problems with the hardware.

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How to fix Nagios bandwidth graph showing 0 MB in Non-English Systems

This guide will show you the steps to fix Nagios bandwidth graph showing 0 MB issue.

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Last Check Time Not Updating in Nagios XI

This guide will help you to solve Nagios error "Last Check Time Not Updating" which affects Nagios XI.

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How to fix Nagios error XI installation script fails when installing dependency pymssql

This article will help to fix Nagios error experienced during XI installation when its script fails in the process of installing dependency pymssql which occurs as a result of missing packages in the Server repositories. 

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How to fix scheduled backups no longer working in Nagios

This article will guide you on how to solve Nagios scheduled backups failure which occurs when the database is currupted.

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Unable to login to Nagios XI web interface

Sometimes, Nagios users experience login issues and are unable to Log into the Nagios XI web interface due to a number of reasons ranging from the wrong password to the SELinux policy.

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HAProxy Network Error cannot bind socket

This article will guide you on how to fix HAProxy Network Error "cannot bind socket" which results from different reasons.

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phpIPAM installation on CentOS

This article will guide you on how to install phpIPAM on CentOS 8.

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Munin installation on CentOS

This article will guide you through the steps to get Muni installed on CentOS Server.

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KVM Installation on CentOS 7

This article will guide you through the process of installing kernel-based virtual machine (KVM) on your CentOS 7 machine.

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Puppet installation on CentOS 7

This article will guide you through the steps you need to follow to get Puppet installed and configured on CentOS 7 Machine.

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Running multiple versions of PHP on Apache PHP-FPM

This article will guide you through the steps you need to take to run multiple PHP versions on Apache PHP-FPM. We implemented this on Ubuntu 20.04 server handling two websites with two different PHP versions (PHP 7.2 and 7.3).

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Steps to install Debian 9 Stretch

This article will guide you through the complete steps you need to follow to install Debian 9 Stretch on your Machine.

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Htop installation on Linux


This article will show you how to install Htop across different Linux Distributions and Operating System.

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ioncube Installation on Ubuntu

This article will guide you through the steps to install ionCube on Ubuntu.

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MongoDB installation on Ubuntu

This article will guide you on how to install MongoDB on Ubuntu.

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Ansible Software installation on ubuntu

This article will put you through to install Ansible on Ubuntu and Debian Machines to get it to work via its inventory file.

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DBeaver installation on debian


This well documented article will guide you on how to install DBeaver on Debian and Ubuntu Server.

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Odoo installation on Centos

This article will guide you on how to install Odoo software on CentOS 7. Odoo is a very popular business software for managing business application.

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Enable Epel repository on Linux

This article will show you how to enable EPEL repository on different Linux distribution. EPEL repo can be installed with the yum utility on CentOS and RHEL.

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PostgreSQL installation on Centos 7

This article will show you how to install PostgreSQL via the default Centos repositories or from the official Postgres repositories.

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VirtualBox installation on CentOS 7

This article will help you to install VirtualBox on Centos. VirtualBox Software helps to create and run virtual machines on a single hardware machine.

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Skyline installation on CentOS 7

The right steps to install Skyline and Redis databases.

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Rclone installation process

Rclone is an open-source command line tool which helps to sync files to cloud storage which is makes data migration between storage spaces easy.

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Setup redis on centos 7

The Process of Installing Redis and Setting its Firewall on Centos 7.

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Solve rsync error code 19

Best method of fixing Rsync error code 19.

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Solution to invalid command SSLEngine Error in apache

Effective method of fixing Invalid command SSLEngine Error in Apache web server.

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Solve SQL server error 7416

Most sql users discover that the logins which they used before suddenly develops server error 7416.

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Resolve strace command not found error in Linux

An easy method to solving strace command not found in CentOS, Debian and Ubuntu Linux Distribution

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Solve curl 52 empty reply from server

Curl is the command line tool which is responsible for running curl through a Server shell. curl runs under the libcurl library which relays response from the server whenever a request is called.

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How to get rid of Docker error 255

Docker errors such as the exit status error 255 are quite difficult to troubleshoot because it tends to stop the process giving that error status.

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Fix SQL Server Error 11001

We have handled numerous SQL related bugs for our customers as part of our Linux Support Services.

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Fix curl error 67

Curl error 67 occurs when trying to download a file from an remote server for use in a local environment. This error relates with not using the correct login information.

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How to solve CodeIgniter a PHP error was encountered

Easy method to fix CodeIgniter a PHP error was encountered bug when the code used by the programmer is poor and contains bugs.

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Solve SQL server error 15023

Here at IbmiMedia, we have seen numerous support request relating to SQL bugs and have fixed Databases related issues as part of our Server Support Services.

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How to setup Railgun in Cpanel

Websites using Railgun appears to be more efficient in terms of page loading time. Railgun catalyses the speed at which a website process in a web browser. Thus it helps to increase site speed.

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Method to upgrade MySQL in VestaCP

It is very important to upgrade your OS MySQL database to the latest version so as to keep the system more secured and to enjoy the latest features.

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Setup openvas on linux Debian and Ubuntu

OpenVAS software framework is a great security tool checking if the system is vulnerable by means of scanning and Management. It helps to safeguard the server from unauthorized access.

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How to securely back up your Linux Ubuntu Centos and Debian Server

#Backup and #restore refers to technologies and practices for making periodic copies of data and applications to a separate, secondary device and then using those copies to recover the data and applications—and the business operations on which they depend in the event that the original data and applications are lost.

#rsync uses what is called a delta-transfer algorithm which compares files from source and destination and sends only the differences between them.

To automatically backup #files and directories in Linux:

1. archive the content. Backing up your files using tar is very simple using the following command: # tar -cvpzf /backup/backupfilename.tar.gz /data/directory.

2. create backup script. Now let's add tar command in a bash script to make this backup process automatic.


#Rsync, or Remote Sync, is a free command-line tool that lets you transfer files and directories to local and remote destinations. 

Rsync is used for mirroring, performing backups, or migrating data to other servers.

Backing up file systems means copying file systems to removable media (such as tape) to safeguard against loss, damage, or corruption. 

Restoring file systems means copying reasonably current backup files from removable media to a working directory.

Data losses can be a very frustration encounter for a server owner. To avoid such catastrophic situations in losing your website data, it is very important to do a regular backup for your server and website.

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