1.6. 将 etcd 移动到不同的磁盘

流程

1. 创建名为 etcd-mc.yml 的 MachineConfig YAML 文件并添加以下信息：

   apiVersion: machineconfiguration.openshift.io/v1
   kind: MachineConfig
   metadata:
     labels:
       machineconfiguration.openshift.io/role: master
     name: 98-var-lib-etcd
   spec:
     config:
       ignition:
         version: 3.2.0
       systemd:
         units:
         - contents: |
             [Unit]
             Description=Make File System on /dev/sdb
             DefaultDependencies=no
             BindsTo=dev-sdb.device
             After=dev-sdb.device var.mount
             Before=systemd-fsck@dev-sdb.service
   
             [Service]
             Type=oneshot
             RemainAfterExit=yes
             ExecStart=/usr/lib/systemd/systemd-makefs xfs /dev/sdb
             TimeoutSec=0
   
             [Install]
             WantedBy=var-lib-containers.mount
           enabled: true
           name: systemd-mkfs@dev-sdb.service
         - contents: |
             [Unit]
             Description=Mount /dev/sdb to /var/lib/etcd
             Before=local-fs.target
             Requires=systemd-mkfs@dev-sdb.service
             After=systemd-mkfs@dev-sdb.service var.mount
   
             [Mount]
             What=/dev/sdb
             Where=/var/lib/etcd
             Type=xfs
             Options=defaults,prjquota
   
             [Install]
             WantedBy=local-fs.target
           enabled: true
           name: var-lib-etcd.mount
         - contents: |
             [Unit]
             Description=Sync etcd data if new mount is empty
             DefaultDependencies=no
             After=var-lib-etcd.mount var.mount
             Before=crio.service
   
             [Service]
             Type=oneshot
             RemainAfterExit=yes
             ExecCondition=/usr/bin/test ! -d /var/lib/etcd/member
             ExecStart=/usr/sbin/setenforce 0
             ExecStart=/bin/rsync -ar /sysroot/ostree/deploy/rhcos/var/lib/etcd/ /var/lib/etcd/
             ExecStart=/usr/sbin/setenforce 1
             TimeoutSec=0
   
             [Install]
             WantedBy=multi-user.target graphical.target
           enabled: true
           name: sync-var-lib-etcd-to-etcd.service
         - contents: |
             [Unit]
             Description=Restore recursive SELinux security contexts
             DefaultDependencies=no
             After=var-lib-etcd.mount
             Before=crio.service
   
             [Service]
             Type=oneshot
             RemainAfterExit=yes
             ExecStart=/sbin/restorecon -R /var/lib/etcd/
             TimeoutSec=0
   
             [Install]
             WantedBy=multi-user.target graphical.target
           enabled: true
           name: restorecon-var-lib-etcd.service

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2. 运行以下命令来创建机器配置：

   $ oc login -u ${ADMIN} -p ${ADMINPASSWORD} ${API}
   ... output omitted ...

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   $ oc create -f etcd-mc.yml
   machineconfig.machineconfiguration.openshift.io/98-var-lib-etcd created

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   $ oc login -u ${ADMIN} -p ${ADMINPASSWORD} ${API}
    [... output omitted ...]

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   $ oc create -f etcd-mc.yml machineconfig.machineconfiguration.openshift.io/98-var-lib-etcd created

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   节点已更新并重启。重启完成后，会出现以下事件：

   • XFS 文件系统是在指定磁盘中创建的。
   • 磁盘挂载到 /var/lib/etc。
   • 来自 /sysroot/ostree/deploy/rhcos/var/lib/etcd 的内容同步到 /var/lib/etcd。
   • 对于 /var/lib/etcd，强制恢复 SELinux 标签。
   • 旧内容不会被删除。

3. 节点位于独立磁盘后，使用以下信息更新机器配置文件 etcd-mc.yml ：

   apiVersion: machineconfiguration.openshift.io/v1
   kind: MachineConfig
   metadata:
     labels:
       machineconfiguration.openshift.io/role: master
     name: 98-var-lib-etcd
   spec:
     config:
       ignition:
         version: 3.2.0
       systemd:
         units:
         - contents: |
             [Unit]
             Description=Mount /dev/sdb to /var/lib/etcd
             Before=local-fs.target
             Requires=systemd-mkfs@dev-sdb.service
             After=systemd-mkfs@dev-sdb.service var.mount
   
             [Mount]
             What=/dev/sdb
             Where=/var/lib/etcd
             Type=xfs
             Options=defaults,prjquota
   
             [Install]
             WantedBy=local-fs.target
           enabled: true
           name: var-lib-etcd.mount

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4. 输入以下命令应用删除创建和同步设备的逻辑的修改版本：

   $ oc replace -f etcd-mc.yml

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   上一步可防止节点重新引导。