我正在尝试在 CentOS 7 上安装 PostgreSQL（按照本指南安装 Discourse），但是当我发出以下命令时：
sudo yum install postgresql91-server.x86_64 postgresql91-contrib.x86_64 postgresql91-devel.x86_64
我收到此错误：
Loaded plugins: fastestmirror base | 3.6 kB 00:00:00 epel/x86_64/metalink | 24 kB 00:00:00 extras | 3.4 kB 00:00:00 nginx | 2.9 kB 00:00:00 http://yum.postgresql.org/9.1/redhat/rhel-7-x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. To address this issue please refer to the below knowledge base article
https://access.redhat.com/articles/1320623
If above article doesn't help to resolve this issue please create a bug on https://bugs.centos.org/
One of …