How to check the centos system version

Update the system: Use sudodnfupdate-y (CentOS8/Stream) or sudoyumupdate-y (CentOS7) to ensure the system is up to date; 2. Install Samba: Run sudodnfininstallsambasamba-commonsamba-client-y (or yum command) to install core components; 3. Configure sharing: Backup and edit /etc/samba/smb.conf, and add basic sharing settings such as [shared]path=/srv/samba/shared; 4. Set directory permissions: Create a shared directory and set chmod0755, chownno

To restart network services in CentOS, you must first confirm the network management method used by the system. 1. Use the ps-ef|grepNetworkManager command to determine whether it is a NetworkManager or a traditional network service; 2. If you use a new version of CentOS (such as CentOS7 or Stream), it is recommended to restart the network service through sudosystemctlrestartNetworkManager or sudosystemctlrestartnetwork; 3. You can use nmcliconnectionreload to reload the configuration without interrupting the service, or execute s for specific connections.

Update the system: Run sudoyumupdate-y to ensure the system is up to date; 2. Install EPEL source: execute sudoyuminstalllepel-release-y to obtain the Nginx package; 3. Install Nginx: Use sudoyuminstallnginx-y to install the service; 4. Start and enable Nginx: Set up the power-on startup through sudosystemctlstartnginx and sudosystemctlenablenginx, and use sudosystemctlstatusnginx to confirm the running status; 5. Configure the firewall: If firewalld is enabled, run sudofir

When partitioning new hard disks, fdisk is suitable for MBR partition tables, and parted is recommended for GPT partition tables; when using fdisk, first use lsblk or fdisk-l to identify the hard disk device, run sudofdisk/dev/sdX to create the main/extended partition, set the start and end sectors and enter w to save and refresh the partition table and then format it; when using parted, run sudoparted/dev/sdX to set it to gpt partition table, use mkpart to create partitions to specify GB or percentage, and format it after exiting; pay attention to partition alignment, type settings and FAT32ESP partition required for UEFI startup.

To view the status and rules of FirewallD, you can follow the following steps: 1. Use systemctlstatusfirewalld to confirm whether the service is running. If it is not running, you can start sudosystemctlstartfirewalld and set the power on and start it up with enable; 2. View the current area through firewall-cmd-get-active-zones, and use --get-zones to view all areas; 3. Execute firewall-cmd-list-all to view all rules in the current area. Add the --zone parameter to specify the area, and use --list-rich-rules to view rich

To filter journalctl logs, view them by service or time range. 1. Filter by service name: use journalctl-u, such as journalctl-unginx.service; if you are not sure of service name, you can find systemctllist-units|grep. 2. Filter by time range: use --since and --until to specify the time, such as journalctl--since"1hourago" or journalctl--since"2025-04-0510:30:00"--until"2025

Reboot and enter the GRUB menu, press e to edit the startup item; 2. Add init=/bin/bash or rd.break at the end of linux or linux16 line; 3. If you use rd.break, you need to chroot/sysroot first, then mount-oremount,rw/; 4. Execute passwdroot to set a new password; 5. If SELinux is enabled, run touch/.autorelabel; 6. Execute reboot-f to restart to take effect. This method is suitable for CentOS7 and above and requires physical or console access.

Create a service file: Create a .myapp.service file in /etc/systemd/system/, set the [Unit], [Service], [Install] sections and configure key parameters such as Description, ExecStart (using absolute path), User, Restart, etc.; 2. Reload and enable the service: execute sudosystemctldaemon-reload, enable, and start to enable the service and set the power-on self-start; 3. Avoid common errors: do not use relative paths, do not run with root, ensure the script permissions are correct, must be overloaded after modification, and finally use sudosystemct