1、rocky linux9再安装软件的时候报错：
[root@Client119 yum.repos.d]# yum -y install epel-release
[root@Client119 yum.repos.d]# yum -y install libcgroup
Extra Packages for Enterprise Linux 9 - x86_64 0.0 B/s | 0 B 00:05
Errors during downloading metadata for repository 'epel':
- Curl error (60): SSL peer certificate or SSH remote key was not OK for https://mirrors.fedoraproject.org/metalink?repo=epel-9&arch=x86_64&infra=$infra&content=pub/rocky [SSL certificate problem: certificate is not yet valid]
Error: Failed to download metadata for repo 'epel': Cannot prepare internal mirrorlist: Curl error (60): SSL peer certificate or SSH remote key was not OK for https://mirrors.fedoraproject.org/metalink?repo=epel-9&arch=x86_64&infra=$infra&content=pub/rocky [SSL certificate problem: certificate is not yet valid]
2、问题原因：大概是时间同步的问题（我在虚拟机里面恢复快照过去，时间停留在了当时快照拍摄的时间）、应该是系统无法连接到 EPEL 存储库。这是由于证书问题造成的，该问题可能是由系统时钟不正确引起的。
3、配置时间同步:
[root@Client119 yum.repos.d]# vim /etc/chrony.conf
pool ntp1.aliyun.com iburst
pool ntp2.aliyun.com iburst
pool ntp3.aliyun.com iburst
pool ntp4.aliyun.com iburst
pool ntp5.aliyun.com iburst
pool ntp6.aliyun.com iburst
[root@Client119 yum.repos.d]# chronyc sources -v
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current best, '+' = combined, '-' = not combined,
| / 'x' = may be in error, '~' = too variable, '?' = unusable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? 120.25.115.20 2 8 200 552 -15ms[-2815us] +/- 46ms
^* 203.107.6.88 2 6 377 33 -4046us[-6196us] +/- 31ms
[root@Client119 yum.repos.d]# date
Sat Oct 5 04:39:41 PM CST 2024
[root@Client119 yum.repos.d]#