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Ignore permission denied message from find command in Linux
This article covers how to resolve the error 'ignore permission denied message from find' which occurs while running a 'find' command in Linux.
The find command is used to locate files on a Linux or Unix like operating system.
The find command will search directory to match the supplied search criteria.
You can search for files by type, name, owner, group, date, permissions and more. By default the find will search all subdirectories for you.
Linux divides the file permissions into read, write and execute denoted by r,w, and x.
The permissions on a file can be changed by 'chmod' command which can be further divided into Absolute and Symbolic mode.
The 'chown' command can change the ownership of a file/directory.
If you prefer using the command line, you can easily find a file's permission settings with the ls command, used to list information about files/directories.
You can also add the –l option to the command to see the information in the long list format.
To change directory permissions in Linux, use the following:
1. chmod +rwx filename to add permissions.
2. chmod -rwx directoryname to remove permissions.
3. chmod +x filename to allow executable permissions.
4. chmod -wx filename to take out write and executable permissions.
Use Nmap to Scan Open Ports - How to
This article covers how to use Nmap to Scan Open Ports. Nmap is the world's leading port security network scanner. The Nmap hosted security tool can help you determine how well your firewall and security configuration is working.
How would you tell Nmap to scan all ports?
By default, Nmap scans the 1,000 most popular ports of each protocol it is asked to scan.
Alternatively, you can specify the -F (fast) option to scan only the 100 most common ports in each protocol or --top-ports to specify an arbitrary number of ports to scan.
The OS and Service scanning options are helpful for scanning a particular port or service to get more information.
If a service is running on a non-default port, it might be by design – or it might suggest there is a security breach.
Ports often have a default usage. Most ports under 1000 are dedicated and assigned to a specific service.
What file does Nmap use to determine which ports to scan?
Nmap needs an nmap-services file with frequency information in order to know which ports are the most common.
Malicious ("black hat") hackers (or crackers) commonly use port scanning software to find which ports are "open" (unfiltered) in a given computer, and whether or not an actual service is listening on that port. They can then attempt to exploit potential vulnerabilities in any services they find.
Checkpoint Process in SQL Server - An Insight into it
This article covers the Checkpoint process in SQL server and the four types of checkpoints available.
Checkpoints are the useful repositories of information and serve best for the recovery of SQL server databases.
Different Types of Checkpoint in #SQL:
1. Automatic Checkpoint
An automatic checkpoint is the most common type that is triggered by a background process. Server Configuration Option “Recovery Interval” is used by the SQL Server Database Engine to determine how often automatic checkpoints are issued on a given database.
2. Indirect Checkpoint
A new type of #checkpoint introduced in SQL Server 2012 is an Indirect checkpoint. Indirect checkpoint also runs in the background, but it meets user-specified target recovery time for a given database.
3. Manual Checkpoint
Manual checkpoint runs like any other Transact-SQL command. It runs to completion by default. This type of checkpoint occurs in the current database only. It is also possible to set the time frame in which you want your checkpoint completed.
4. Internal Checkpoint
The fourth type is Internal checkpoint that cannot be controlled by user.
Nginx Ingress with Cert-manager on DigitalOcean
This article covers how to set up Nginx ingress on DigitalOcean Kubernetes with cert-manager. Popular Ingress Controllers include Nginx, Contour, HAProxy, and Traefik. Ingresses provide a more efficient and flexible alternative to setting up multiple LoadBalancer services, each of which uses its own dedicated Load Balancer.
Here, you will learn how to set up an Nginx Ingress to load balance and route external requests to backend Services inside of your Kubernetes cluster.
You also secured the Ingress by installing the cert-manager certificate provisioner and setting up a Let's Encrypt certificate for two host paths.
Most Ingress Controllers use only one global Load Balancer for all Ingresses, which is more efficient than creating a Load Balancer per every Service you wish to expose.
Helm is a package manager for managing Kubernetes. Using Helm Charts with your Kubernetes provides configurability and lifecycle management to update, rollback, and delete a Kubernetes application.
Once you’ve set up the Ingress, you’ll install Cert Manager to your cluster to be able to automatically provision Let’s Encrypt TLS certificates to secure your Ingresses.
Website Iframe malware injection
This article covers methods to secure websites from iframe attacks. Iframes Bring Security Risks. If you create an iframe, your site becomes vulnerable to cross-site attacks. You may get a submittable malicious web form, phishing your users' personal data.
One of the most popular online attacks that happens all the time has to do with thousands of legitimate websites being hacked with the “Iframe code injection” attack resulting in Cross Site Scripting (XSS) or silent redirections to malicious websites.
This means that unsuspicious visitors get infected with a malware virus when they visit that legitimate websites.
What happens is that an “Iframe html code” is injected at the end (usually) of “index.php” or “index.html” files of the legitimate websites.
This “iframe” code embeds into the legitimate site a malicious code which installs a virus to the visitor’s PC or tries to steal sensitive information.
Some tips to clean the infection of your site:
1. First of all scan and clean your own computer which you use to connect to your site. The Trojan might be undetectable by some antivirus, so you better format the windows OS and install a fresh copy.
2. Change ALL your passwords and most importantly the FTP passwords and the website control panel passwords.
3. Download all files from your website and store them in a safe place on your PC to further analyze the infection.
4. If you have a recent clean backup of your website, upload the backup files and replace all current files.
5. If you don’t have a backup (shame on you!!) then edit all source code (html or PHP files) and search for <iframe> html commands inside the code. Delete the suspicious <iframe> and re-upload all html, php files to your website.
6. Download an antivirus tool which scans the website for <iframe> content.
If you use WordPress there are some great security plugins which scan your website's source code for infections and also protect the site with a firewall.
dbus launch terminated abnormally
This article covers tips to resolve this #dbus #error message, dbus-launch terminated abnormally. You need to install D-Bus. It is nothing but a message bus system, a simple way for applications to talk to one another.
In addition to interprocess communication, D-Bus helps coordinate process lifecycle; it makes it simple and reliable to code a "single instance" application or daemon, and to launch applications and daemons on demand when their services are needed.
The dbus-launch command is used to start a session bus instance of dbus-daemon from a shell script.
It would normally be called from a user's login scripts.
With no arguments, dbus-launch will launch a session bus instance and print the address and PID of that instance to standard output.
To fix /bin/dbus-launch terminated abnormally without any error message on a CentOS/RHEL:
Type the following yum command to install D-Bus and Fonts:
$ sudo yum install dbus-x11
To install Fonts, type:
$ sudo yum groupinstall 'Fonts'
Now, you can run and tunnel X over ssh:
$ ssh -X user@server1.ibmimedia.com
$ xeyes
$ firefox
