Add some useful external repositories to install useful third party software packages.
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install a plugin to add priorities to each installed repositories.
# yum -y install yum-plugin-priorities
set priority=1 to official repository
# sed -i -e "s/\]$/\]\npriority=1/g" /etc/yum.repos.d/CentOS-Base.repo
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Add EPEL Repository which is provided from Fedora project.
# yum -y install epel-release
set priority=5
# sed -i -e "s/\]$/\]\npriority=5/g" /etc/yum.repos.d/epel.repo
change to enabled=0 and use it only when needed
# sed -i -e "s/enabled=1/enabled=0/g" /etc/yum.repos.d/epel.repo
if enabled=0, input a command to use the repository
# yum --enablerepo=epel install [Package]
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Add RPMforge Repository which provides many useful packages.
# yum -y install http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el7.rf.x86_64.rpm
Download and install DAG’s GPG key for your system.
# wget http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt # rpm --import RPM-GPG-KEY.dag.txt
set priority=10
# sed -i -e "s/\]$/\]\npriority=10/g" /etc/yum.repos.d/rpmforge.repo
change to enabled=0 and use it only when needed
# sed -i -e "s/enabled = 1/enabled = 0/g" /etc/yum.repos.d/rpmforge.repo
if enabled=0, input a command to use the repository
# yum --enablerepo=rpmforge install [Package]