The key to updating the CentOS kernel is to use the ELRepo repository and set up the startup items correctly. 1. First run uname-r to view the current kernel version; 2. Install the ELRepo repository and import the key; 3. Use yum to install kernel-lt (long-term support version) or kernel-ml (main version); 4. After the installation is completed, check the available kernels through the awk command and use grub2-set-default to set the default startup item; 5. Generate a new GRUB configuration file grub2-mkconfig-o/boot/grub2/grub.cfg; 6. Finally restart the system and run uname-r again to confirm whether the kernel version is effective. The whole process requires

To configure the CentOS7 static IP address, you need to edit the ifcfg file of the corresponding network card. 1. First confirm the network card name such as ens33 through iplinkshow or ls/sys/class/net; 2. Edit the /etc/sysconfig/network-scripts/ifcfg-ens33 file to set BOOTPROTO=static and fill in IPADDR, NETMASK, GATEWAY and other parameters; 3. After saving, restart the network service to make the configuration take effect; 4. Use the ipaddrshow and ping commands to verify whether the configuration is successful. Be careful to avoid IP conflicts and restart the network service after modification. If you use NetworkM

In Linux system, using the usermod command to add users to the secondary group is: 1. Execute the sudousermod-a-G group name username command to add, where -a means append to avoid overwriting the original secondary group; 2. Use groups username or grep group name /etc/group to verify whether the operation is successful; 3. Note that the modification only takes effect after the user logs in again, and the main group modification should use the -g parameter; 4. You can also manually edit the /etc/group file to add users, but be careful to avoid system abnormalities caused by format errors.

To migrate from CentOS8 to AlmaLinux or RockyLinux, follow the clear steps. First, choose AlmaLinux (suitable for long-term enterprise support) or RockyLinux (emphasizing exactly the same as RHEL) according to your needs. Secondly, prepare the system environment: update the software package, back up key data, check third-party repositories and disk space. Then, the conversion is automatically completed using the official migration script. RockyLinux needs to clone the repository and run the switch-to-rocky.sh script. AlmaLinux replaces the repository and upgrades with one click through the remote deployment script. Finally, verify system information, clean up residual packets, and update GRUB and ini if ??necessary

To correctly install the local RPM file and handle dependencies, you should first use dnf to install it directly, because it can automatically obtain the required dependencies from the configured repository; if the system does not support dnf, you can use yum's localinstall command instead; if the dependency cannot be resolved, you can manually download and install all related packages; finally, you can also forcefully ignore the dependency installation, but this method is not recommended. 1. Use sudodnfinstall./package-name.rpm to automatically resolve dependencies; 2. If there is no dnf, you can use sudoyumlocalinstall./package-name.rpm; 3. Force installation and execute sudorpm-ivh--nod

How to set a static IP address using nmcli on CentOS8 or 9? 1. First run the nmcliconnectionshow and ipa commands to view the current network interface and its configuration; 2. Use the nmcliconnectionmodify command to modify the connection configuration, specify parameters such as ipv4.methodmanual, ipv4.addresses (such as 192.168.1.100/24), ipv4.gateway (such as 192.168.1.1), and ipv4.dns (such as 8.8.8.8). 3. Run the nmcliconnectiondown and up commands to restart the connection to make the changes take effect, or

AminimalinstallofCentOSisalightweightsetupthatincludesonlyessentialcomponents,makingitidealforserversorsystemsrequiringfullcontrol.Itcontainscoreutilitieslikebash,yum/dnf,networkingtools,andsecuritypackages,whileexcludingdesktopenvironments,webserver

The current running mode of SELinux can be viewed through the command line. Use getenforce command to directly display the current status, and the output is Enforcing, Permissive or Disabled; view the /etc/selinux/config file to know the default startup mode; temporarily change the mode can be setenforce1 (enforcing) or setenforce0 (permissive), but restore the configuration file settings after restart; in actual applications, you need to pay attention to service compatibility issues, and switch modes to troubleshoot problems if necessary.