salt centos6 repo

[saltstack-repo]
name=SaltStack repo for RHEL/CentOS $releasever
baseurl=https://archive.repo.saltproject.io/yum/redhat/$releasever/$basearch/latest
enabled=1
gpgcheck=1
gpgkey=https://archive.repo.saltproject.io/yum/redhat/$releasever/$basearch/latest/SALTSTACK-GPG-KEY.pub

centos6的repo url变了一下，不大好找，上面这个很好用。
话说回来，还是今早升级7或者8