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CentOS

How to install a VNC server on CentOS 7

To install and configure the VNC server on CentOS7, you must first update the system and install TigerVNC, 1. Create a non-root user and set a VNC password, 2. Configure the systemd service file to specify user and startup parameters, 3. Modify the xstartup file to enable the GNOME desktop environment, 4. Start and enable the VNC service, 5. The firewall opens port 5901 or uses SSH tunnel to enhance security. After completing the configuration, the graphical interface can be accessed remotely through the VNC client, and the entire process ensures security and complete functions.

Aug 13, 2025 am 09:38 AM

How to start, stop, and restart services in CentOS

CentOS service management depends on the version, CentOS7 and above use systemctl, CentOS6 and before use service and chkconfig. 1. For CentOS7: Use systemctl to manage the service, sudosystemctlstartsshd start the service, sudosystemctlstopsshd stop the service, sudosystemctlrestartsshd restart the service, sudosystemctlreloadsshd reload configuration, sudosystemctlenablesshd set to start the machine automatically, sudosystemctl

Aug 13, 2025 am 07:40 AM

centos Service management

How to configure Iptables in CentOS

First, confirm the CentOS version. CentOS6 uses iptables by default. CentOS7/8 uses firewalld. By default, iptables-services must be installed to enable traditional iptables; 2. On CentOS7/8, firewalld must be stopped and disabled. After installing iptables-services, start and enable iptables service; 3. Use the iptables command to configure rules, including viewing rules, clearing rules, setting default policies, allowing loopbacks, established connections, SSH, HTTP, HTTPS and ICMP traffic; 4. Pass serviceiptablessave

Aug 13, 2025 am 07:00 AM

How to clean the yum cache in CentOS

TocleantheyumcacheinCentOS,runyumcleanalltoremoveallcacheddataincludingmetadata,packages,andheaders.2.Usespecificcommandslikeyumcleanpackages,yumcleanmetadata,yumcleanheaders,oryumcleandbcachetocleanindividualcachetypes.3.Verifythecleanupbycheckingth

Aug 13, 2025 am 01:46 AM

centos yum

How to install Java on CentOS 7

Check whether Java is installed and use the java-version command to verify; 2. Install OpenJDK8 (recommended) or OpenJDK11, and use yumininstalljava-1.8.0-openjdk and its -devel package to support development; 3. After installation, run java-version and javac-version to confirm the installation is successful; 4. Set the JAVA_HOME environment variable, edit the /etc/profile.d/java.sh file and export the path to ensure that the Tomcat, Maven and other applications run normally; 5. If you need to switch the Java version, use sudoalternatives--co

Aug 12, 2025 pm 02:19 PM

How to monitor a CentOS server

Usebuilt-intoolsliketop,htop,df,du,free,vmstat,iostat,andssforreal-timemonitoringofCPU,memory,disk,andnetworkusage.2.Enablesystemloggingvia/var/logfilesandjournalctl,andconfigurelogrotationtomanagediskspace.3.SetupcentralizedmonitoringwithZabbixorNag

Aug 12, 2025 pm 02:14 PM

What is the default root password for CentOS 7

CentOS7 does not have a default root password, and it needs to be set manually during installation, otherwise the root account will remain locked; in actual use, users should perform administrator tasks through sudo. If the root password has been set, they can log in or switch directly. When it is not set, they need to use sudo permission users to execute sudopasswdroot to set it; Summary: 1. CentOS7 has no default root password; 2. Root account is locked by default; 3. It is recommended to use sudo for management operations; 4. The root password can be manually set through sudopasswdroot, so when you cannot log in to root directly, you should check whether the password setting has been completed or the sudo user has been used to obtain permissions. This design is designed to improve the system

Aug 12, 2025 am 11:30 AM

How to find which package a file belongs to in CentOS

Userpm-qf/path/to/filetofindthepackagethatownsaninstalledfile,suchasrpm-qf/bin/lsreturningcoreutils-8.32-10.el8.x86_64.2.Forfilesnotyetinstalled,useyumprovides/path/to/fileordnfprovides/path/to/filetoidentifywhichpackageprovidesthefile,evenifit'snotc

Aug 12, 2025 am 02:09 AM

How to install GUI on CentOS 7

CentOS7 does not include a graphical interface by default, and needs to manually install the GNOME desktop environment. 1. First check the GUI component: yumgrouplist|grep-gui; 2. Install GNOME: sudoyumgroupinstall "GNOMEDesktop"-y, it is recommended to run sudoyumupdate-y to update the system first; 3. Set the default startup to the graphical interface: sudosystemctlset-defaultgraphical.target, you can use sudosystemctlisolategraphical.target to enter immediately; 4. Result

Aug 11, 2025 pm 06:18 PM

How to install KVM on CentOS 7

CheckCPUsupportforvirtualizationusingegrep-c'(vmx|svm)'/proc/cpuinfo,wherearesultof1orhigherindicatessupport;2.InstallKVMpackagesincludingqemu-kvm,libvirt,andvirt-installusingsudoyuminstall-y;3.Startandenablelibvirtdservicewithsystemctlstartandenable

Aug 11, 2025 pm 05:12 PM

How to set up an FTP server on CentOS 7

Install vsftpd service and start: Use yum to install vsftpd, start and enable power-on self-start, and confirm the service running status; 2. Configure vsftpd: Edit the configuration file, enable local_enable=YES, write_enable=YES, chroot_local_user=YES, and add allow_writeable_chroot=YES to allow writable chroot, set pasv_enable=YES and passive port range 40000-40100, specify pasv_address as the server public network IP, and disable anonymous_enable=YES; 3. Configure

Aug 11, 2025 pm 05:08 PM

ftp server centos 7

How to configure a DHCP server on CentOS 7

First install the DHCP server package, then configure the main configuration file and specify the network interface, and finally start the service and configure the firewall. 1. Use the sudoyumininstalldhcp-y command to install the DHCP service; 2. Back up and edit the /etc/dhcp/dhcpd.conf file, set the subnet, range, routers, domain-name-servers and other parameters to match the local network; 3. Edit the /etc/sysconfig/dhcpd file, and specify the listening interface such as ens33 through DHCPDARGS; 4. Start and enable the dhcpd service: sudosystemctlstartdhcpd

Aug 11, 2025 pm 03:16 PM

dhcp centos 7

How to install a Let's Encrypt SSL certificate on CentOS 7

Install EPEL and Certbot: First run sudoyumininstalllepel-release-y, and then install the corresponding package according to the web server type. Apache user executes sudoyumininstallcertbotpython2-certbot-apache-y, and Nginx user executes sudoyumininstallcertbotpython2-certbot-nginx-y. 2. Ensure the server configuration is correct: confirm that the domain name is resolved to the server IP, the web service is running normally, and pass sudofirewall-cmd-permanent-add-ser

Aug 08, 2025 am 08:48 AM

How to update CentOS

CheckyourCentOSversionusingcat/etc/centos-releaseorhostnamectltodetermineifyouareonCentOSLinux(7or8)orCentOSStream(8or9).2.ForCentOSLinux7or8,useyumupdateandyumupgradeforversion7ordnfupdateanddnfupgradeforversion8,butnotebothareend-of-lifeasof2024and

Aug 08, 2025 am 03:10 AM