nfs“storage-driver=overlay2”不支持'overlay2‘

Question

当我使用以下命令启动docker(版本18.09.6)时：

service docker start

日志输出：

Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.058391699+08:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0xc420166a80, READY" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.065016392+08:00" level=error msg="'overlay2' is not supported over nfs" storage-driver=overlay2
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: Error starting daemon: error initializing graphdriver: backing file system is unsupported for this graph driver

这是我的deamon.json配置：

{
    "data-root": "/data/docker/lib/docker",
    "storage-driver": "overlay2",
    "storage-opts": [
      "overlay2.override_kernel_check=true",
      "overlay2.size=1G"
    ]
}

我的docker有什么问题？这是完整的日志输出：

Sep 14 23:47:23 iZuf63refzweg1d9dh94t9Z systemd[1]: Starting Docker Application Container Engine...
Sep 14 23:47:23 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:23+08:00" level=warning msg="The \"-g / --graph\" flag is deprecated. Please use \"--data-root\" instead"
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.054488483+08:00" level=info msg="parsed scheme: \"unix\"" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.054528530+08:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.054680027+08:00" level=info msg="ccResolverWrapper: sending new addresses to cc: [{unix:///run/containerd/containerd.sock 0  <nil>}]" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.054720022+08:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.054796786+08:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0xc420166680, CONNECTING" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.055020881+08:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0xc420166680, READY" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.058007723+08:00" level=info msg="parsed scheme: \"unix\"" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.058029632+08:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.058172958+08:00" level=info msg="ccResolverWrapper: sending new addresses to cc: [{unix:///run/containerd/containerd.sock 0  <nil>}]" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.058204756+08:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.058254343+08:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0xc420166a80, CONNECTING" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.058391699+08:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0xc420166a80, READY" module=grpc
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: time="2019-09-14T23:47:24.065016392+08:00" level=error msg="'overlay2' is not supported over nfs" storage-driver=overlay2
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z dockerd[21199]: Error starting daemon: error initializing graphdriver: backing file system is unsupported for this graph driver
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z systemd[1]: Failed to start Docker Application Container Engine.
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z systemd[1]: Unit docker.service entered failed state.
Sep 14 23:47:24 iZuf63refzweg1d9dh94t9Z systemd[1]: docker.service failed.
Sep 14 23:47:26 iZuf63refzweg1d9dh94t9Z systemd[1]: docker.service holdoff time over, scheduling restart.
Sep 14 23:47:26 iZuf63refzweg1d9dh94t9Z systemd[1]: Stopped Docker Application Container Engine.
Sep 14 23:47:26 iZuf63refzweg1d9dh94t9Z systemd[1]: start request repeated too quickly for docker.service
Sep 14 23:47:26 iZuf63refzweg1d9dh94t9Z systemd[1]: Failed to start Docker Application Container Engine.
Sep 14 23:47:26 iZuf63refzweg1d9dh94t9Z systemd[1]: Unit docker.service entered failed state.
Sep 14 23:47:26 iZuf63refzweg1d9dh94t9Z systemd[1]: docker.service failed.

Answer 1

重点是我的主机(总共5个)挂载一个共享nfs disk.Change，这个路径应该可以解决这个问题。

[root@iZuf63refzweg1dh94t9Z containers]# df -T /data
Filesystem                                      Type      1K-blocks      Used      Available Use% Mounted on
3761b-lrf18.cn-shanghai.nas.aliyuncs.com:/ nfs4 10995116277760 233244672 10994883033088   1% /data

将daemon.json根路径更改为本地：

{
    "data-root": "/var/lib/docker",
    "storage-driver": "overlay2"
}