更新yum源遇到SSL证书过期的报错
[root@ESNode01 ~]# yum clean all Loaded plugins: fastestmirror Cleaning repos: base extras pgdg-common pgdg10 pgdg11 pgdg12 pgdg13 pgdg14 updates Cleaning up everything Cleaning up list of fastest mirrors [root@ESNode01 ~]# yum makecache Loaded plugins: fastestmirror base | 3.6 kB 00:00:00 extras | 2.9 kB 00:00:00 https://download.postgresql.org/pub/repos/yum/common/redhat/rhel-7-x86_64/repodata/repomd.xml: [Errno 14] curl#60 - "The certificate issuer's certificate has expired. Check your system date and time." Trying other mirror. It was impossible to connect to the CentOS servers. This could mean a connectivity issue in your environment, such as the requirement to configure a proxy, or a transparent proxy that tampers with TLS security, or an incorrect system clock. Please collect information about the specific failure that occurs in your environment, using the instructions in: https://access.redhat.com/solutions/1527033 and create a bug on https://bugs.centos.org/
解决方法
[root@ESNode01 ~]# vim /etc/yum.conf sslverify=false
增加该配置，关闭ssl验证
