Curl error (60): Peer certificate cannot be authenticated with given CA certificates,yum Cannot down

今天把几台放了一段时间的单板机开了起来

两台装了rocky linux ,一台装了Ubuntu server 20

树莓派的更新yum显示报错

报CA错误，但是我一想，树莓派节点是没有rtc电池的，没有硬件时间，很可能是因为时间问题导致的这个错误

于是我开始查找如何同步时间，centos8 和 rocky linux 8 都默认不带ntpdate,使用chrony进行时间同步，chrony是一个ntp协议的实现，使用起来更简单

只需要如下配置

 systemctl enable chronyd.servicesystemctl start chronyd.servicesystemctl status chronyd.service就可以看到● chronyd.service - NTP client/serverLoaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)Active: active (running) since Fri 2018-06-22 11:11:53 UTC; 16h agoDocs: man:chronyd(8)man:chrony.conf(5)Main PID: 270 (chronyd)Tasks: 1 (limit: 11407)CGroup: /system.slice/chronyd.service└─270 /usr/sbin/chronyd

这个时候时间还是没有同步到的，我们需要修改配置文件

/etc/chrony.conf

# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#pool 2.pool.ntp.org iburst    //注释掉默认的服务器
server ntp.aliyun.com iburst
server ntp.ntsc.ac.cn iburst//添加阿里云和国家授时中心查看服务
[root@node3 yum.repos.d]# chronyc sourcestats -v
210 Number of sources = 2.- Number of sample points in measurement set./    .- Number of residual runs with same sign.|    /    .- Length of measurement set (time).|   |    /      .- Est. clock freq error (ppm).|   |   |      /           .- Est. error in freq.|   |   |     |           /         .- Est. offset.|   |   |     |          |          |   On the -.|   |   |     |          |          |   samples. \|   |   |     |          |          |             |
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
203.107.6.88                4   3     6   +246.828   4770.108   +217us   566us
114.118.7.161               3   3     6   +500.884     218244    +18ms  1077us

此时我们查看下时间是否正确

[root@node3 yum.repos.d]# timedatectlLocal time: 五 2021-11-26 02:05:36 UTCUniversal time: 五 2021-11-26 02:05:36 UTCRTC time: n/aTime zone: UTC (UTC, +0000)
System clock synchronized: yesNTP service: activeRTC in local TZ: no[root@node1 ~]# timedatectlLocal time: Thu 2021-11-25 21:20:39 ESTUniversal time: Fri 2021-11-26 02:20:39 UTCRTC time: Fri 2021-11-26 02:20:39Time zone: America/New_York (EST, -0500)
System clock synchronized: yesNTP service: activeRTC in local TZ: no

时间是对了，但是时区不对，我们设置时区，再查看时间

root@node3 yum.repos.d]# timedatectl set-timezone Asia/Shanghai
[root@node3 yum.repos.d]#
[root@node3 yum.repos.d]# timedatectlLocal time: 五 2021-11-26 10:06:43 CSTUniversal time: 五 2021-11-26 02:06:43 UTCRTC time: n/aTime zone: Asia/Shanghai (CST, +0800)
System clock synchronized: yesNTP service: activeRTC in local TZ: no

OK，我们再次尝试 yum makecache

[root@node3 yum.repos.d]# yum makecache
Rocky Linux 8 - AppStream                                                     4.6 MB/s | 7.0 MB     00:01
Rocky Linux 8 - BaseOS                                                        2.6 MB/s | 2.9 MB     00:01
Rocky Linux 8 - Extras                                                        643 kB/s | 322 kB     00:00
元数据缓存已建立。

OK ,问题解决~

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