check if package installation is installed
1) rpm -q epel-release
epel-release package not installed
then install it
2) yum install package epel-release *
> 3) wget https://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol7 -O /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle --no-check-certificate 4)wget https://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol7 -O /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle --no-check-certificate
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