Installation and introduction of yum

First, the introduction of yum command

Yum (Yellow dog Updater, Modified) is a Shell front-end package manager in Fedora and RedHat as well as in SUSE.

Based on RPM package management, RPM packages can be downloaded and installed automatically from designated servers, dependencies can be automatically handled, and all dependent software packages can be installed at once without having to download and install them again and again.

Yum provides commands to find, install, and delete one, a group, or even all of the software packages, and the commands are concise and easy to remember.

Second, the installation example of yum warehouse.

The environment is configured in the virtual machine.

[root@localhost /] # mount / dev/cdrom / media/

Mount: / dev/sr0 write protection, which will be mounted as read-only

[root@localhost /] # ls / etc/yum.repos.d/

CentOS-Base.repo CentOS-Debuginfo.repo CentOS-Media.repo CentOS-Vault.repo

CentOS-CR.repo CentOS-fasttrack.repo CentOS-Sources.repo

[root@localhost /] # yum clean all cleans up previous yum files or rm-rf / etc/yum.repos.d/*

Loaded plug-ins: fastestmirror, langpacks

Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast

Cleaning software source: base extras updates

Cleaning up everything

Cleaning up list of fastest mirrors

[root@localhost /] # vim / etc/yum.repos.d/centos7.repo

[base]

Name=good

Baseurl= file:///media

Enabled=1

Gpgcheck=0

[root@localhost /] # yum-y install httpd mod_ssl