Enforcing server security using hardware firewall

This article covers how important is enforcing process in server security using a #hardware #firewall. A firewall is a system that provides network security by filtering incoming and outgoing network traffic based on a set of user-defined rules. In general, the purpose of a firewall is to reduce or eliminate the occurrence of unwanted network communications while allowing all legitimate communication to flow freely.


A hardware firewall sits between your local network of computers and the Internet. 

The firewall will inspect all the data that comes in from the Internet, passing along the safe data packets while blocking the potentially dangerous packets.


Hardware firewalls allow you to protect your entire network from the outside world with a single physical device. 

This device is installed between your computer network and the internet.

A software firewall is installed on an individual computer and it protects that single device.


Tips to achieving network security:

1. Use strong authentication methods.

2. Upgrade your software with latest security patch.

3. Physically secure equipment and ports.

4. Establish cyber security rules for your employees and make them aware of the important role they play in security.

5. Encrypt your data and require users to enable bios passwords.

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SQL error 1071 - Fix it Now

This article covers methods to resolve SQL error 1071 which generally happens if the combined key is too long, and adjusting the varchar value must resolve this error.

MySQL always reserves the max amount for a UTF8 field which is 4 bytes so with 255  + 255 with your DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci; 

you are over the 767 max key length limit.

You can only reduce the single varchar length or don't use a composite key.


To fix SQL error 1071:

You can also add these lines to a new conifg file in /etc/my.conf.d directory named umb4-support.cnf:

[mysqld]
innodb_large_prefix=true
innodb_file_format=barracuda
innodb_file_per_table=true

Then restart the maria db service.

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libvirtd failed to start - Fix it Now

This article covers how to resolve the error 'libvirtd failed to start' which happens while manually trying to start libvirt daemon. 

To resolve this #libvirtd #error, Try journalctl -u libvirtd.service and see if the full log for the service has more information.

You can manually install "libxslt" to resolve the problem.

Also you can try re-installing the packages that libvirtd/KVM requires and did a full system update. 

After that, reboot the server, and libvirtd.service will be working fine.

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Methods to secure database server - Best Practices

This article covers different methods to secure a Database Server. Database security helps: Company's block attacks, including ransomware and breached firewalls, which in turn keeps sensitive information safe. It Prevent malware or viral infections which can corrupt data, bring down a network, and spread to all end point devices.


SQL injection vulnerabilities occur when application code contains dynamic database queries which directly include user supplied input. 

This is a devastating form of attack and BSI Penetration Testers regularly find vulnerable applications that allow complete authentication bypass and extraction of the entire database.

SQL injection, also known as SQLI, is a common attack vector that uses malicious SQL code for backend database manipulation to access information that was not intended to be displayed. 

This information may include any number of items, including sensitive company data, user lists or private customer details.


Some known database security issues:

Security risks to database systems include,

1. Data corruption and/or loss caused by the entry of invalid data or commands

2. Mistakes in database or system administration processes, sabotage/criminal damage and so on.


There are numerous types of databases and many different ways to hack them, but most hackers will either try to crack the database root password or run a known database exploit. 

If you're comfortable with SQL statements and understand database basics, you can hack a database.


Practices for Database Security:

1. Protect Against Attacks With a Database Proxy.

2. Set Up Auditing and Robust Logging.

3. Practice Stringent User Account Management.

4. Keep Your Database Software and OS Up-to-Date.

5. Encrypt Sensitive Data in Your app, in Transit, and at Rest.

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Benefits of Data Warehouse in Business Organization

This article covers the Advantages of Data Warehouse. 

#Data #warehousing improves the speed and efficiency of accessing different data sets and makes it easier for corporate decision-makers to derive insights that will guide the business and marketing strategies that set them apart from their competitors. Improve their bottom line.

Unlike a database, which is focused on users inputting data, a data warehouse is architected for decision-making, ad hoc queries and analytics. Thus, enabling queries to be performed without any impact to your company's operational database.


A data warehouse is a type of data management system that is designed to enable and support business intelligence (BI) activities, especially analytics. Data warehouses are solely intended to perform queries and analysis and often contain large amounts of historical data.


A data warehouse can help support business needs, such as the ability to consolidate financial results within a complex company that uses different software for different divisions.


Benefits of a Data Warehouse:

1. Delivers enhanced business intelligence.

2. Saves times.

3. Enhances data quality and consistency.

4. Generates a high Return on Investment (ROI).

5. Provides competitive advantage.

6. Improves the decision-making process.

7. Enables organizations to forecast with confidence.

8. Streamlines the flow of information.


The key characteristics of a data warehouse are as follows:

1. Some data is denormalized for simplification and to improve performance.

2. Large amounts of historical data are used.

3. Queries often retrieve large amounts of data.

4. Both planned and ad hoc queries are common.

5. The data load is controlled.


A data warehouse is subject oriented because it provides information around a subject rather than the organization's ongoing operations.


Data warehouses will help you make better, more informed decisions for many reasons, including: 

1. Improved business intelligence

2. When you integrate multiple sources, you make decisions based on ALL of your data. 

3. Timely access to data: Quickly access critical data in one centralized location.

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No guest machines present libvirtd - Fix it now

This article covers how to troubleshoot and fix No guest machines present libvirtd for our customers. 

The virsh program is the main interface for managing virsh guest domains. The program can be used to create, pause, and shutdown domains. 

It can also be used to list current domains. Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes).

The libvirt daemon is successfully started, but no guest virtual machines appear to be present.


There are various possible causes of this problem.

Performing these tests will help to determine the cause of this situation:

1. Verify KVM kernel modules

Verify that KVM kernel modules are inserted in the kernel:

$ lsmod | grep kvm

If you are using an AMD machine, verify the kvm_amd kernel modules are inserted in the kernel instead, using the similar command lsmod | grep kvm_amd in the root shell.

If the modules are not present, insert them using the modprobe <modulename> command.

Note: Although it is uncommon, KVM virtualization support may be compiled into the kernel. In this case, modules are not needed.

2. Verify virtualization extensions

Verify that virtualization extensions are supported and enabled on the host:

# egrep "(vmx|svm)" /proc/cpuinfo

Enable virtualization extensions in your hardware's firmware configuration within the BIOS setup.

3. Verify client URI configuration

Verify that the URI of the client is configured as desired:

# virsh uri


How to fix No guest machines present #libvirtd #error:

After performing these tests, use the following command to view a list of guest virtual machines:

# virsh list --all

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