Centos

To clean the yum cache for untracked repositories, disable the untracked repositories and clean the Yum cache via the “yum clean all” command.

CentOS / RHEL offers the “clean all” command to clean the entire YUM cache, including “metadata ”, “package headers”, and “packages” from the system.

CentOS offers the “rpm -ql ” and “rpm -qf ” commands to list all files installed from an RPM package and find the package belonging to a specific file.

CentOS offers the “yum” package manager to install the telnet via the “sudo yum install telnet” command. To configure it, enable the “telnet.socket” services.

CentOS offers the “firewall-cmd –permanent –add-port=80/tcp” command to open a port in the system. For this, configure the firewall to allow traffic.

CentOS offers the “YUM” to install a specific version of an RPM package on a system. For this, specify the “package name” and the “version”.

CentOS / RHEL offers the “sysctl” configuration file and “kernel” module to disable IPv6 in the system. For this, setting the disable_ipv6 parameter to 1.

CentOS offers the “ntpdate” command with the “ntpd” service to synchronize the NTP server forcefully. It sets the system time with the time of the NTP server.

CentOS / RHEL offers the “clean all” command to clean the entire YUM cache, including “metadata ”, “package headers”, and “packages” from the system.

The “yum –downloadonly [options] [package]” command downloads a package without installing them in CentOS. Also, specify the location to download the package.

To install MySQL on CentOS 7, the “mysql-server” package is required after enabling the repository of MySQL 8.0. It installs all dependencies in the system.

To list the open ports in firewalld, the “firewall-cmd” command works with the “–list-ports” option. Before it, users ensure the active services of Firewalld.

CentOS offers the “lsb_release”, “hostnamectl”, and “uname” commands to check the CentOS version. Also, the “centos-release” file contains version information.

To check the available packages in the Yum package manager, the “yum list” and “yum info” commands are utilized in Linux System.