2. 程式人生 > >搭建NFS服務 ,並在Kubernetes掛載NFS

搭建NFS服務 ,並在Kubernetes掛載NFS

阿新 • • 發佈：2019-01-23 
[[email protected] log]# kubectl describe pod prometheus-544bf54848-b97rn --namespace=kube-system
Name:           prometheus-544bf54848-b97rn
Namespace:      kube-system
Node:           szy-k8s-node1/10.10.31.203
Start Time:     Tue, 26 Jun 2018 17:05:08 +0800
Labels:         app=prometheus
                pod-template-hash=1006910404
 

Annotations:    <none>
Status:         Pending
IP:             
Controlled By:  ReplicaSet/prometheus-544bf54848
Containers:
  prometheus:
    Container ID:   
    Image:          prom/prometheus:latest
    Image ID:       
    Port:           9090/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       ContainerCreating
    Ready:          False
 

    Restart Count:  0
    Environment:    <none>
    Mounts:
      /etc/prometheus/prometheus.yml from prometheus-conf-volume (rw)
      /etc/prometheus/rules from prometheus-rules-volume (rw)
      /prometheus from prometheus-data-volume (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from prometheus-token-6
 
lmsv (ro)
Conditions:
  Type           Status
  Initialized    True 
  Ready          False 
  PodScheduled   True 
Volumes:
  prometheus-data-volume:
    Type:       PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:  prometheus-data-pvc
    ReadOnly:   false
  prometheus-conf-volume:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      prometheus-conf
    Optional:  false
  prometheus-rules-volume:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      prometheus-rules
    Optional:  false
  prometheus-token-6lmsv:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  prometheus-token-6lmsv
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node-role.kubernetes.io/master:NoSchedule
                 node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason       Age                  From                    Message
  ----     ------       ----                 ----                    -------
  Warning  FailedMount  30m (x348 over 16h)  kubelet, szy-k8s-node1  Unable to mount volumes for pod "prometheus-544bf54848-b97rn_kube-system(068ba024-7920-11e8-89d1-00505681317e)": timeout expired waiting for volumes to attach or mount for pod "kube-system"/"prometheus-544bf54848-b97rn". list of unmounted volumes=[prometheus-data-volume]. list of unattached volumes=[prometheus-data-volume prometheus-conf-volume prometheus-rules-volume prometheus-token-6lmsv]
  Warning  FailedMount  36s (x573 over 16h)  kubelet, szy-k8s-node1  (combined from similar events): MountVolume.SetUp failed for volume "prometheus-data-pv" : mount failed: exit status 32
Mounting command: systemd-run
Mounting arguments: --description=Kubernetes transient mount for /var/lib/kubelet/pods/068ba024-7920-11e8-89d1-00505681317e/volumes/kubernetes.io~nfs/prometheus-data-pv --scope -- mount -t nfs 10.10.31.202:/nfs/prometheus/data /var/lib/kubelet/pods/068ba024-7920-11e8-89d1-00505681317e/volumes/kubernetes.io~nfs/prometheus-data-pv
Output: Running scope as unit run-26056.scope.
mount.nfs: requested NFS version or transport protocol is not supported

解決方法：搭建NFS服務

#在master安裝
[root@szy-k8s-master /]# yum install -y nfs-utils rpcbind
#在每個node安裝
[root@szy-k8s-node1 /]# yum install -y nfs-utils 
#在每個node安裝
[root@szy-k8s-node2 /]# yum install -y nfs-utils

配置：

#NFS服務的配置檔案  /etc/exports。 這個檔案可能不會存在，需要新建
[root@szy-k8s-master /]# cat /etc/exports
/nfs/prometheus/data/ 10.10.31.0/24(rw,no_root_squash,no_all_squash,sync)
#exports中的配置的內容，需要建立下/nfs/prometheus/data/
[root@szy-k8s-master /]# mkdir -p  /nfs/prometheus/data/
#修改許可權
[root@szy-k8s-master /]# chmod -R 777 /nfs/prometheus/data/
#驗證配置的/nfs/prometheus/data/是否正確
[root@szy-k8s-master /]# exportfs -r
10.10.31.0/24：這個是執行訪問NFS的IP範圍，也就是10.10.31開頭的IP，24是掩碼長度。 根據自己的k8s主機網段設定。
(rw,no_root_squash,no_all_squash,sync)：
可以設定的引數主要有以下這些：

rw：可讀寫的許可權；
ro：只讀的許可權；
no_root_squash：登入到NFS主機的使用者如果是root，該使用者即擁有root許可權；
root_squash：登入NFS主機的使用者如果是root，該使用者許可權將被限定為匿名使用者nobody；
all_squash：不管登陸NFS主機的使用者是何許可權都會被重新設定為匿名使用者nobody。
anonuid：將登入NFS主機的使用者都設定成指定的user id，此ID必須存在於/etc/passwd中。
anongid：同anonuid，但是變成group ID就是了！
sync：資料同步寫入儲存器中。
async：資料會先暫時存放在記憶體中，不會直接寫入硬碟。
insecure：允許從這臺機器過來的非授權訪問。

啟動服務：

[root@szy-k8s-master /]# systemctl start rpcbind
[root@szy-k8s-master /]# systemctl status rpcbind
● rpcbind.service - RPC bind service
   Loaded: loaded (/usr/lib/systemd/system/rpcbind.service; disabled; vendor preset: enabled)
   Active: active (running) since Wed 2018-06-27 11:05:29 CST; 1h 51min ago
  Process: 4111 ExecStart=/sbin/rpcbind -w $RPCBIND_ARGS (code=exited, status=0/SUCCESS)
 Main PID: 4112 (rpcbind)
   Memory: 580.0K
   CGroup: /system.slice/rpcbind.service
           └─4112 /sbin/rpcbind -w

Jun 27 11:05:29 szy-k8s-master systemd[1]: Starting RPC bind service...
Jun 27 11:05:29 szy-k8s-master systemd[1]: Started RPC bind service.
[root@szy-k8s-master /]# systemctl start nfs
[root@szy-k8s-master /]# systemctl status nfs
● nfs-server.service - NFS server and services
   Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; disabled; vendor preset: disabled)
   Active: active (exited) since Wed 2018-06-27 11:26:54 CST; 1h 30min ago
  Process: 11859 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS)
  Process: 11853 ExecStartPre=/bin/sh -c /bin/kill -HUP `cat /run/gssproxy.pid` (code=exited, status=0/SUCCESS)
  Process: 11851 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
 Main PID: 11859 (code=exited, status=0/SUCCESS)
   Memory: 0B
   CGroup: /system.slice/nfs-server.service

Jun 27 11:26:54 szy-k8s-master systemd[1]: Starting NFS server and services...
Jun 27 11:26:54 szy-k8s-master systemd[1]: Started NFS server and services.

檢驗：

[root@szy-k8s-master /]# showmount -e 10.10.31.202
Export list for 10.10.31.202:
/nfs/prometheus/data 10.10.31.0/24
[root@szy-k8s-master /]# 
NFS客戶端的操作：
1、showmout命令對於NFS的操作和查錯有很大的幫助，所以我們先來看一下showmount的用法
showmout
-a ：這個引數是一般在NFS SERVER上使用，是用來顯示已經mount上本機nfs目錄的cline機器。
-e ：顯示指定的NFS SERVER上export出來的目錄。
2、mount nfs目錄的方法：
mount -t nfs hostname(orIP):/directory /mount/point

再次檢視問題，已經是成功，可掛載了。

[[email protected] /]# kubectl describe pod prometheus-544bf54848-b97rn --namespace kube-system
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node-role.kubernetes.io/master:NoSchedule
                 node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason       Age                  From                    Message
  ----     ------       ----                 ----                    -------
  Warning  FailedMount  36m (x664 over 19h)  kubelet, szy-k8s-node1  (combined from similar events): MountVolume.SetUp failed for volume "prometheus-data-pv" : mount failed: exit status 32
Mounting command: systemd-run
Mounting arguments: --description=Kubernetes transient mount for /var/lib/kubelet/pods/068ba024-7920-11e8-89d1-00505681317e/volumes/kubernetes.io~nfs/prometheus-data-pv --scope -- mount -t nfs 10.10.31.202:/nfs/prometheus/data /var/lib/kubelet/pods/068ba024-7920-11e8-89d1-00505681317e/volumes/kubernetes.io~nfs/prometheus-data-pv
Output: Running scope as unit run-17572.scope.
mount.nfs: access denied by server while mounting 10.10.31.202:/nfs/prometheus/data
  Warning  FailedMount            20m (x412 over 19h)  kubelet, szy-k8s-node1  Unable to mount volumes for pod "prometheus-544bf54848-b97rn_kube-system(068ba024-7920-11e8-89d1-00505681317e)": timeout expired waiting for volumes to attach or mount for pod "kube-system"/"prometheus-544bf54848-b97rn". list of unmounted volumes=[prometheus-data-volume]. list of unattached volumes=[prometheus-data-volume prometheus-conf-volume prometheus-rules-volume prometheus-token-6lmsv]
  Normal   SuccessfulMountVolume  15m                  kubelet, szy-k8s-node1  MountVolume.SetUp succeeded for volume "prometheus-data-pv"
  Normal   Pulled                 10m                  kubelet, szy-k8s-node1  Successfully pulled image "prom/prometheus:latest"
[[email protected] /]#
掛載NFS報access denied by server :

檢視日誌資訊cat /var/log/messages | grep mount
掛載NFS報access denied by server :
access denied by server while mounting 10.10.31.202:/nfs/grafana/data

[[email protected] monitor]# kubectl describe pod grafana-865bdd58bc-bbfrm --namespace kube-system
......
  Warning  FailedMount  47s (x3 over 5m)  kubelet, szy-k8s-node1  Unable to mount volumes for pod "grafana-865bdd58bc-bbfrm_kube-system(a0c7217e-79ca-11e8-89d1-00505681317e)": timeout expired waiting for volumes to attach or mount for pod "kube-system"/"grafana-865bdd58bc-bbfrm". list of unmounted volumes=[grafana-data-volume]. list of unattached volumes=[grafana-data-volume default-token-q8gkz]
  #檢視日誌資訊cat /var/log/messages | grep mount 
[[email protected] monitor]# cat /var/log/messages | grep mount                                   
Jun 22 17:18:18 localhost kernel: XFS (dm-0): Ending clean mount
Jun 22 17:18:20 localhost kernel: XFS (sda1): Ending clean mount
Jun 22 17:18:56 localhost dracut: *** Including module: usrmount ***
Jun 25 15:24:27 szy-k8s-master kernel: XFS (dm-0): Ending clean mount
Jun 25 15:24:28 szy-k8s-master systemd: Started Remount Root and Kernel File Systems.
Jun 25 15:24:29 szy-k8s-master kernel: XFS (sda1): Ending clean mount
Jun 25 15:24:47 szy-k8s-master systemd: Unmounting RPC Pipe File System...
Jun 25 15:25:01 szy-k8s-master kernel: XFS (dm-0): Ending clean mount
Jun 25 15:25:02 szy-k8s-master systemd: Started Remount Root and Kernel File Systems.
Jun 25 15:25:03 szy-k8s-master kernel: XFS (sda1): Ending clean mount
Jun 25 17:31:34 szy-k8s-master systemd: Started Kubernetes transient mount for /var/lib/kubelet/pods/8cd706bc-785a-11e8-87c1-00505681317e/volumes/kubernetes.io~secret/kube-proxy-token-hwpp2.
Jun 25 17:31:34 szy-k8s-master systemd: Starting Kubernetes transient mount for /var/lib/kubelet/pods/8cd706bc-785a-11e8-87c1-00505681317e/volumes/kubernetes.io~secret/kube-proxy-token-hwpp2.
Jun 25 17:37:41 szy-k8s-master systemd: Started Kubernetes transient mount for /var/lib/kubelet/pods/67f013fa-785b-11e8-87c1-00505681317e/volumes/kubernetes.io~secret/flannel-token-mth94.
Jun 25 17:37:41 szy-k8s-master systemd: Starting Kubernetes transient mount for /var/lib/kubelet/pods/67f013fa-785b-11e8-87c1-00505681317e/volumes/kubernetes.io~secret/flannel-token-mth94.
Jun 25 17:37:46 szy-k8s-master systemd: Started Kubernetes transient mount for /var/lib/kubelet/pods/8ca12ba6-785a-11e8-87c1-00505681317e/volumes/kubernetes.io~secret/kube-dns-token-dcl8h.
Jun 25 17:37:46 szy-k8s-master systemd: Starting Kubernetes transient mount for /var/lib/kubelet/pods/8ca12ba6-785a-11e8-87c1-00505681317e/volumes/kubernetes.io~secret/kube-dns-token-dcl8h.
Jun 25 17:49:46 szy-k8s-master systemd: Started Kubernetes transient mount for /var/lib/kubelet/pods/17f3830f-785d-11e8-89d1-00505681317e/volumes/kubernetes.io~secret/kube-proxy-token-j9tc9.
Jun 25 17:49:46 szy-k8s-master systemd: Starting Kubernetes transient mount for /var/lib/kubelet/pods/17f3830f-785d-11e8-89d1-00505681317e/volumes/kubernetes.io~secret/kube-proxy-token-j9tc9.
Jun 25 17:57:56 szy-k8s-master systemd: Started Kubernetes transient mount for /var/lib/kubelet/pods/3beff963-785e-11e8-89d1-00505681317e/volumes/kubernetes.io~secret/flannel-token-4r9f4.
Jun 25 17:57:56 szy-k8s-master systemd: Starting Kubernetes transient mount for /var/lib/kubelet/pods/3beff963-785e-11e8-89d1-00505681317e/volumes/kubernetes.io~secret/flannel-token-4r9f4.
Jun 25 17:58:05 szy-k8s-master systemd: Started Kubernetes transient mount for /var/lib/kubelet/pods/17db1f20-785d-11e8-89d1-00505681317e/volumes/kubernetes.io~secret/kube-dns-token-qt6ch.
Jun 25 17:58:05 szy-k8s-master systemd: Starting Kubernetes transient mount for /var/lib/kubelet/pods/17db1f20-785d-11e8-89d1-00505681317e/volumes/kubernetes.io~secret/kube-dns-token-qt6ch.
Jun 26 16:38:24 szy-k8s-master systemd: Started Kubernetes transient mount for /var/lib/kubelet/pods/4a420702-791c-11e8-89d1-00505681317e/volumes/kubernetes.io~secret/default-token-q8gkz.
Jun 26 16:38:24 szy-k8s-master systemd: Starting Kubernetes transient mount for /var/lib/kubelet/pods/4a420702-791c-11e8-89d1-00505681317e/volumes/kubernetes.io~secret/default-token-q8gkz.
Jun 27 11:26:54 szy-k8s-master rpc.mountd[11849]: Version 1.3.0 starting
Jun 27 11:27:00 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:29:02 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:31:05 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:33:07 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:35:09 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:37:11 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:39:13 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:41:17 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:43:19 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:45:21 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:47:23 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:49:25 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:51:28 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:53:30 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:55:32 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:57:34 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 11:59:36 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:01:38 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:03:41 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:05:43 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:07:45 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:09:47 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:11:49 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:13:51 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:15:54 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:17:56 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:19:58 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:22:00 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:24:02 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:26:04 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:28:06 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:30:09 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:32:11 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/): not exported
Jun 27 12:34:13 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/prometheus/data (/nfs/prometheus/data): unmatched host
Jun 27 13:26:22 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:26:23 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:26:24 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:26:26 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:26:31 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:26:39 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:26:55 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:27:27 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:28:31 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:30:33 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported
Jun 27 13:32:35 szy-k8s-master rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported

發現問題：rpc.mountd[11849]: refused mount request from 10.10.31.203 for /nfs/grafana/data (/): not exported.
解決問題：

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