Repository EPEL Centos7 and update the virtual machine

Method #1 yum install -y wget; wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm;sudo yum install -y epel-release-latest-7.noarch.rpm Method #2  yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm Method #3 yum install -y wget wget

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