在Azure上使用RedHat8，使用dnf命令安装package时出现SSL证书过期的错误。
Curl error (56): Failure when receiving data from the peer for https://rhui-3.microsoft.com/pulp/repos/content/eus/rhel8/rhui/8.2/x86_64/baseos/os/repodata/repomd.xml [OpenSSL SSL_read: error:14094415:SSL routines:ssl3_read_bytes:sslv3 alert certificate expired, errno 0]
对应方法是无效化subscription manager警告后，重新安装SSL证书。
1. 无效化subscription manager警告
使用sed命令将 enabled=1 改为 enabled=0，无效话subscription manager的警告。
[root@sys-blog ~]# sed -i 's/enabled=1/enabled=0/' /etc/yum/pluginconf.d/subscription-manager.conf
/etc/yum/pluginconf.d/subscription-manager.conf文件内容如下。
[main]
enabled=0
# When following option is set to 1, then all repositories defined outside redhat.repo will be disabled
# every time subscription-manager plugin is triggered by dnf or yum
disable_system_repos=0
2. 安装SSL证书
使用 dnf命令安装SSL证书。
[root@sys-blog ~]# install rhui-azure-rhel8-eus --disablerepo='*' --enablerepo='*microsoft*'