Basic Commands
List packages with pending updates
yum list updates
Show all versions of a package installed on the system
yum --showduplicates list dpdk | expand
Install a specific package
yum install dpdk 19.02-2
If the version you wish to install is older, you may need to…
Remove an installed package
yum remove dpdk
To lock packages
yum install yum-versionlock yum versionlock dpdk
Stock Repos
/etc/yum.repos.d/
Method 1: Boot to live CD and copy repos from there to your system
Method 2: Create a “base” set of repo files by hand.
Create the following file:
vi /etc/yum.repos.d/Centos-Base.repo
Put the following info inside of the file:
[base] name=CentOS-$releasever - Base mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch= $basearch&repo=os #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 priority=1
Save your changes, run yum clean all and yum makecache
Method 3: Using rpm, manually reinstall centos-release-rpm
The first step is to see if the centos-release package is installed, by typing rpm -q centos-release
[root@smartproxy-iad ~]# rpm -q centos-release centos-release-7-6.1810.2.el7.centos.x86_64
If it’s not installed, then the --replacepkgs --replacefiles part of the command can be omitted.
yum remove centos-release # Option A rpm -ivh --replacepkgs --replacefiles centos-release*.rpm # Option B rpm -Uvh centos-release.*.rpm