3.2. 验证 Ceph MDS 服务

流程

1. 在所有控制器上运行以下命令，以检查 MDS docker 容器的状态：

   $ systemctl status ceph-mds@<CONTROLLER-HOST>

   例如：

   ceph-mds@controller-0.service - Ceph MDS
      Loaded: loaded (/etc/systemd/system/ceph-mds@.service; enabled; vendor preset: disabled)
      Active: active (running) since Tue 2018-09-18 20:11:53 UTC; 6 days ago
    Main PID: 65066 (docker-current)
      CGroup: /system.slice/system-ceph\x2dmds.slice/ceph-mds@controller-0.service
              └─65066 /usr/bin/docker-current run --rm --net=host --memory=4g --cpu-quota=100000 -v /var/lib/ceph:/var/lib/ceph:z -v /etc/ceph:/etc/ceph:z -v /var/run/ceph:/var/run/ceph:z -v /etc/localtime:/etc/...