ToinstallPHPandcommonextensionsonCentOS,firstenableEPELandRemirepositoriesviasudoyuminstallepel-release-yandsudoyuminstallhttps://rpms.remirepo.net/enterprise/remi-release-7.rpm-y,theninstallyum-utils.Next,enablethedesiredPHPstreamsuchassudoyum-confi

The key to installing dual systems in Linux and Windows is partitioning and boot settings. 1. Preparation includes backing up data and compressing existing partitions to make space; 2. Use Ventoy or Rufus to make Linux boot USB disk, recommend Ubuntu; 3. Select "Coexist with other systems" or manually partition during installation (/at least 20GB, /home remaining space, swap optional); 4. Check the installation of third-party drivers to avoid hardware problems; 5. If you do not enter the Grub boot menu after installation, you can use boot-repair to repair the boot or adjust the BIOS startup sequence. As long as the steps are clear and the operation is done properly, the whole process is not complicated.

When the CentOS server cannot be connected to the network, you can follow the following steps to check: 1. Check the status of the network interface, use iplinkshow to confirm whether the interface is enabled, if not enabled, use sudoiplinksetup to start, and use ipaddrshow to check the IP allocation status; 2. If it is in DHCP mode, run sudodhclient to obtain the IP. If it is static configuration, check the IP, gateway and DNS settings in /etc/sysconfig/network-scripts/ifcfg- and restart the network service; 3. Check the routing table iprouteshow to ensure that there is a default gateway. If there is no, add it temporarily or modify GATEWAY in the configuration file.

Newbie users should first clarify their usage requirements when choosing a Linux distribution. 1. Choose Ubuntu or LinuxMint for daily use; programming and development are suitable for Manjaro or Fedora; use Lubuntu and other lightweight systems for old devices; recommend CentOSStream or Debian to learn the underlying principles. 2. Stability is preferred for UbuntuLTS or Debian; you can choose Arch or Manjaro to pursue new features. 3. In terms of community support, Ubuntu and LinuxMint are rich in resources, and Arch documents are technically oriented. 4. In terms of installation difficulty, Ubuntu and LinuxMint are relatively simple, and Arch is suitable for those with basic needs. It is recommended to try it first and then decide.

The key to enabling EPEL repository is to select the correct installation method according to the system version. First, confirm the system type and version, and use the command cat/etc/os-release to obtain information; second, enable EPEL through dnfinstallepel-release on CentOS/RockyLinux, and the 8 and 9 version commands are the same; third, you need to manually download the corresponding version of the .repo file and install it on RHEL; fourth, you can re-import the GPG key when encountering problems. Note that the old version may not be supported, and you can also consider enabling epel-next to obtain the test package. After completing the above steps, use dnfrepolist to verify that the EPEL repository is successfully added.

The steps to add a new hard disk to the Linux system are as follows: 1. Confirm that the hard disk is recognized and use lsblk or fdisk-l to check; 2. Use fdisk or parted partitions, such as fdisk/dev/sdb and create and save; 3. Format the partition to a file system, such as mkfs.ext4/dev/sdb1; 4. Use the mount command for temporary mounts, such as mount/dev/sdb1/mnt/data; 5. Modify /etc/fstab to achieve automatic mount on the computer, and test the mount first to ensure correctness. Be sure to confirm data security before operation to avoid hardware connection problems.

Adding new users to the CentOS system requires attention to security settings and permission management. The most basic method is to use the useradd command. Execute sudouseraddnewusername and add the -m parameter to create the user and home directory; use the -G parameter to specify the user group such as wheel to give sudo permissions. Then use sudopasswd to set the password. To configure sudo permissions, it is recommended to add the user to the wheel group: sudousermod-aGwheelnewusername and verify the sudo permissions. If you need SSH login, 1. Check the AllowUsers settings in /etc/ssh/sshd_config and add users

Logs in Linux systems are usually stored in the /var/log directory, which contains a variety of key log files, such as syslog or messages (record system logs), auth.log (record authentication events), kern.log (record kernel messages), dpkg.log or yum.log (record package operations), boot.log (record startup information); log content can be viewed through cat, tail-f or journalctl commands; application logs are often located in subdirectories under /var/log, such as Apache's apache2 or httpd directory, MySQL log files, etc.; at the same time, it is necessary to note that log permissions usually require s