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Yum (full name Yellow dog Updater, Modified) is a shell front-end package manager in Fedora and RedHat and CentOS. Based on RPM package management, it can automatically download and install RPM packages from a specified server, automatically handle dependencies, and install all dependent packages at one time, without having to download and install tediously again and again.
The YUM of CENTOS generally defaults to foreign sources. It is best to change to domestic sources such as Ali or 163 first. The following is to change to Ali.
cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum makecache
Explanation of the above command
backup first
Download Ali's YUM package
Update YUM cache
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YUM is stored in
/etc/yum.repos.d/
View how
ll /etc/yum.repos.d/
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You can manually edit the yum file yourself
open one of them
vim CentOS-Base.repo
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simple explanation
cachedir=/var/cache/yum/$basearch/$releasever #yum cache directory after downloading keepcache=0 # Whether to cache, 0 is no cache, 1 is cache debuglevel=2 logfile=/var/log/yum.log # yum installation log exactarch=1 obsoletes=1 gpgcheck=1 # Whether to perform gpg check by default, 0 means no check, 1 check plugins=1 installonly_limit=5 bugtracker_url=https://bugs.centos.org/set_project. php?project_id=23&ref=https://bugs.centos.org/bug_report_page.php?category=yum distroverpkg=centos-release
Detailed description:
https://blog.csdn.net/qq_27754983/article/details/73693061
Check what software list is currently available on yum
yum list
can be filtered
yum list | grep php*
Some commonly used commands include:
Automatically search for the fastest mirror plugin: yum install yum-fastestmirror
Install the yum graphical window plugin: yum install yumex
See a list of possible batch installs: yum grouplist
Example 1, yum installs nginx
rpm package specified
yum install
rpm -ivh https://nginx.org/packages/centos/7/x86_64/RPMS/nginx-1.12.2-1.el7_4.ngx.x86_64.rpm
yum install nginx
check rmp -ql nginx
Example 2. YUM installs PHP7.2
yum -y remove php*
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
yum -y install php72w php72w-cli php72w-common php72w-devel php72w-embedded php72w-fpm php72w-gd php72w-mbstring php72w-opcache php72w-pdo php72w-xml php72w-pear php72w-redis php72w-phpunit-PHPUnit php72w-bcmath
Command description:
uninstall the original php
update source
Install a set
Finish