查看pod状态为CrashLoopBackOff
[root@master yaml]# kubectl get pods
NAME READY STATUS RESTARTS AGE
mysql-77b495b4fd-pjw2w 0/1 CrashLoopBackOff 5 5m查看pod的详细信息，看到最后一行
Back-off restarting failed container
[root@master yaml]# kubectl describe pod/mysql-77b495b4fd-pjw2w
Name: mysql-77b495b4fd-pjw2w
Namespace: default
Node: node2/192.168.1.100
Start Time: Tue, 24 Jul 2018 09:56:37 +0800
Labels: app=mysql
pod-template-hash=3360516098
Annotations: <none>
Status: Running
IP: 10.244.2.90
Controlled By: ReplicaSet/mysql-77b495b4fd
Containers:
mysql:
Container ID: docker://00a667790c3ec1d07071e15f49887c0df1d06964612952775d3e2f7f40e4cffe
Image: mysql:5.6
Image ID: docker-pullable://mysql@sha256:29e32fba52c3e6708fdc8a7678287debe3554febced25ade8686a63d4409ceda
Port: 3306/TCP
Host Port: 0/TCP
State: Terminated
Reason: Error
Exit Code: 1
Started: Tue, 24 Jul 2018 10:02:21 +0800
Finished: Tue, 24 Jul 2018 10:02:21 +0800
Last State: Terminated
Reason: Error
Exit Code: 1
Started: Tue, 24 Jul 2018 09:59:30 +0800
Finished: Tue, 24 Jul 2018 09:59:30 +0800
Ready: False
Restart Count: 6
Environment:
MYSQL_ROOT_PASSWORD:
Mounts:
/var/lib/mysql from mysql-persistent-storage (rw)
/var/run/secrets/kubernetes.io/serviceaccount from default-token-zjcdx (ro)
Conditions:
Type Status
Initialized True
Ready False
PodScheduled True
Volumes:
mysql-persistent-storage:
Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
ClaimName: mysql-pvc
ReadOnly: false
default-token-zjcdx:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-zjcdx
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulMountVolume 5m kubelet, node2 MountVolume.SetUp succeeded for volume "default-token-z
Normal SuccessfulMountVolume 5m kubelet, node2 MountVolume.SetUp succeeded for volume "mysql-pv"
Normal Pulling 5m kubelet, node2 pulling image "mysql:5.6"
Normal Scheduled 5m default-scheduler Successfully assigned mysql-77b495b4fd-pjw2w to node2
Normal Pulled 5m kubelet, node2 Successfully pulled image "mysql:5.6"
Normal Created 4m (x5 over 5m) kubelet, node2 Created container
Normal Started 4m (x5 over 5m) kubelet, node2 Started container
Normal Pulled 4m (x4 over 5m) kubelet, node2 Container image "mysql:5.6" already present on machine
Warning BackOff 45s (x24 over 5m) kubelet, node2 Back-off restarting failed container
查看pod的日志信息,得知mysql必须要指定其中一个变量
[root@master yaml]# kubectl log mysql-77b495b4fd-pjw2w
log is DEPRECATED and will be removed in a future version. Use logs instead.
error: database is uninitialized and password option is not specified
You need to specify one of MYSQL_ROOT_PASSWORD, MYSQL_ALLOW_EMPTY_PASSWORD and MYSQL_RANDOM_ROOT_PASSWORD