8.5.8.6. NTP 没有同步

流程

1. 检查集群节点的 AGE 的不同。例如：

   $ oc get nodes

   NAME                         STATUS   ROLES    AGE   VERSION
   master-0.cloud.example.com   Ready    master   145m   v1.16.2
   master-1.cloud.example.com   Ready    master   135m   v1.16.2
   master-2.cloud.example.com   Ready    master   145m   v1.16.2
   worker-2.cloud.example.com   Ready    worker   100m   v1.16.2

2. 检查因为时钟偏移导致的时间延迟。例如：

   $ oc get bmh -n openshift-machine-api

   master-1   error registering master-1  ipmi://<out-of-band-ip>

   $ sudo timedatectl

                  Local time: Tue 2020-03-10 18:20:02 UTC
              Universal time: Tue 2020-03-10 18:20:02 UTC
                    RTC time: Tue 2020-03-10 18:36:53
                   Time zone: UTC (UTC, +0000)
   System clock synchronized: no
                 NTP service: active
             RTC in local TZ: no

处理现有集群中的时钟偏移

1. 创建 chrony.conf 文件并将其编码为 base64 字符串。例如：

   $ cat << EOF | base 64
   server <NTP-server> iburst1
   stratumweight 0
   driftfile /var/lib/chrony/drift
   rtcsync
   makestep 10 3
   bindcmdaddress 127.0.0.1
   bindcmdaddress ::1
   keyfile /etc/chrony.keys
   commandkey 1
   generatecommandkey
   noclientlog
   logchange 0.5
   logdir /var/log/chrony
   EOF

   1

   将 <NTP-server> 替换为 NTP 服务器的 IP 地址。复制输出。

   [text-in-base-64]

2. 创建 MachineConfig 对象，将 base64 字符串替换为上一步输出中生成的 [text-in-base-64] 字符串。以下示例将文件添加到 Control Plane（master）节点。您可以修改 worker 节点的文件，或为 worker 角色创建额外的机器配置。

   $ cat << EOF > ./99_masters-chrony-configuration.yaml
   apiVersion: machineconfiguration.openshift.io/v1
   kind: MachineConfig
   metadata:
     creationTimestamp: null
     labels:
       machineconfiguration.openshift.io/role: master
     name: 99-master-etc-chrony-conf
   spec:
     config:
       ignition:
         config: {}
         security:
           tls: {}
         timeouts: {}
         version: 3.1.0
       networkd: {}
       passwd: {}
       storage:
         files:
         - contents:
             source: data:text/plain;charset=utf-8;base64,[text-in-base-64]1
           group:
             name: root
           mode: 420
           overwrite: true
           path: /etc/chrony.conf
           user:
             name: root
     osImageURL: ""

   1

   将 [text-in-base-64] 替换为 base64 字符串。

3. 对配置文件做一个副本备份。例如：

   $ cp 99_masters-chrony-configuration.yaml 99_masters-chrony-configuration.yaml.backup

4. 应用配置文件：

   $ oc apply -f ./masters-chrony-configuration.yaml

5. 确定 System clock synchronized 的值为 yes：

   $ sudo timedatectl

                  Local time: Tue 2020-03-10 19:10:02 UTC
              Universal time: Tue 2020-03-10 19:10:02 UTC
                    RTC time: Tue 2020-03-10 19:36:53
                   Time zone: UTC (UTC, +0000)
   System clock synchronized: yes
                 NTP service: active
             RTC in local TZ: no

   要在部署前设置时钟同步，请生成清单文件并将该文件添加到 openshift 目录中。例如：

   $ cp chrony-masters.yaml ~/clusterconfigs/openshift/99_masters-chrony-configuration.yaml

   然后继续创建集群。