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CentOS 7 is a Linux distribution that provides a free, enterprise-class, community-supported computing platform functionally compatible with its upstream source, Red Hat Enterprise Linux

You can download OS images at https://www.centos.org/download/


Topics associated with Centos

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    Change MySQL port number — The default port that MySQL database server is running under Linux and Unix is 3306/TCP. In order to change the default MySQL/MariaDB database port in Linux, open MySQL server configuration file for editing by issuing the below command.
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    Changing GitLab repository — In order to change the data directory, you need to add git_data_dirs in /etc/gitlab/gitlab.rb
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    Check network port is open or not on CentOS 7 — To check listening port on CentOS 7, you can do it by "netstat" simply, or you can try it by "ss". I was easily able to check which port is open or not on CentOS 7.
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    Downgrade PHP from version 7.3 to 7.2 on CentOS — You can downgrade PHP from version 7.3. to 7.2 by yum and yum-config-manager.
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    Enabling a service on boot in Centos 7 — In case that you have service on /etc/init.d/ but it does not start automatically, you can simply enable it by run chkconfig function.
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    How do I check confluence java settings on Centos 7? — If you want to check your java settings on Centos 7, you can simply check by "ps" command.
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    How do I send email on command line in Centos 7? — Unfortunately Centos 7 minimal version does not have mail client running on command line, but you can use it by installing mailx.
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    How to check CentOS version? — The simplest way to check CentOS version is reading release information on /etc/centos-release:
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    Increase Number of Open Files Limit in Linux — In Linux, there are some cases that application needs to open multiple files at the same time - probably database like MySQL is one of the cases accessing multiple files at the same time, because MySQL create files for table and its index on the file system, so it will cause opening multiple files at the same time.
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    Install GitLab Community Edition on CentOS 7 GitLab is an open source repository manager based on Rails developed by GitLab Inc. It is a web based git repository manager that allows your team collaborate on coding, testing and deploying applications. GitLab provides several features, including wikis, issue tracking, code reviews, and activity feeds. GitLab Community Edition is designed to self-hosted and free, but it does not provide technical supports. GitLab supports not only for CentOS but also other operating system as well. 
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    Install mod_url to support multi byte characters on CentOS 7 mod_url enables httpd to support multibyte characters like Korean file, so you can download Korean file (한글파일) from your apache server without any error message. httpd basically does not support it, so you should install mod_url.
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    Install Pandas, NumPy and MatPlotLib on CentOS 7 — For data processing in Python, Pandas and NumPy are super useful.  Before installing Pandas and NumPy, you should have pip on your CentOS 7.
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    Install PHP on CentOS 7 — You need to run yum in order to use PHP after setup your CentOS 7. Even though you have httpd, PHP may need to be installed manually. For compatibility with various applications like PHPMyAdmin, PHP-based server management, you will need to install additional libraries.
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    Install the latest version of Python on CentOS 7 — This is the easier method of the two for installing Python on your machine. Here, we simply add a repository that has the pre-compiled version ready for us to install. In this case, we are adding the Inline with Upstream Stable repository, a community project whose goal is to bring new versions of software to RHEL-based systems.
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    Install Tkinter on CentOS 7 Tkinter is a Python binding to the Tk GUI toolkit. It is the standard Python interface to the Tk GUI toolkit, and is Python's de facto standard GUI.


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