@[TOC]k8s安装MySQL集群问题汇总
1、错误0/3 nodes are available: 3 pod has unbound immediate PersistentVolumeClaims.
kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
db mysql-0 0/2 Pending 0 7m48s
kubectl -n db describe pod mysql-0
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedScheduling 6m55s default-scheduler 0/3 nodes are available: 3 pod has unbound immediate PersistentVolumeClaims.
Warning FailedScheduling 6m53s default-scheduler 0/3 nodes are available: 3 pod has unbound immediate PersistentVolumeClaims.
kubectl -n db get pv,pvc
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
persistentvolume/pv-a 2Gi RWX Retain Released db/data-mysql-0 nfs 77m
persistentvolume/pv-b 2Gi RWX Retain Released db/data-mysql-1 nfs 77m
persistentvolume/pv-c 2Gi RWX Retain Released db/data-mysql-2 nfs 77m
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
persistentvolumeclaim/data-mysql-0 Pending nfs 2m54s
原因：pv状态Released未释放，创建pvc时找不到合适的pv
解决方法：删除pvc,pv，然后重建
kubectl -n db delete pvc data-mysql-0
kubectl -n db delete pv pv-a pv-b pv-c
kubectl -n db describe pod mysql-0
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedScheduling 2m39s default-scheduler 0/3 nodes are available: 3 pod has unbound immediate PersistentVolumeClaims.
Warning FailedScheduling 2m37s default-scheduler 0/3 nodes are available: 3 pod has unbound immediate PersistentVolumeClaims.
kubectl -n db describe pvc
Name: data-mysql-0
Namespace: db
StorageClass: nfs
Status: Pending
Volume:
Labels: app=mysql
app.kubernetes.io/name=mysql
Annotations: <none>
Finalizers: [kubernetes.io/pvc-protection]
Capacity:
Access Modes:
VolumeMode: Filesystem
Used By: mysql-0
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning ProvisioningFailed 3m11s (x5 over 4m10s) persistentvolume-controller storageclass.storage.k8s.io "nfs" not found
Warning ProvisioningFailed 7s (x7 over 97s) persistentvolume-controller storageclass.storage.k8s.io "nfs" not found
pvc创建失败，检查pv、pvc配置
pv配置：
metadata:
name: pv-a
spec:
capacity:
storage: 2Gi
accessModes:
- ReadWriteMany
persistentVolumeReclaimPolicy: Retain
storageClassName: nfs
nfs:
server: 192.168.216.4
path: /nfsdata/mysql-01
pvc：配置
- metadata:
name: data
namespace: db
spec:
accessModes:
accessModes: ["ReadWriteOnce"]
storageClassName: nfs
resources:
requests:
storage: 1Gi
原因：pv和pvc accessModes配置不一致，造成创建pvc时找不到合适pv，同时pvc大小不能超过pv大小
解决方法：调整参数一致，删除pvc,pv，然后重建
2、init-mysql CrashLoopBackoff.
kubectl -n db describe pod mysql-0
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 3m43s default-scheduler Successfully assigned db/mysql-0 to node02
Normal Pulled <invalid> (x5 over <invalid>) kubelet Container image "mysql:5.7" already present on machine
Normal Created <invalid> (x5 over <invalid>) kubelet Created container init-mysql
Normal Started <invalid> (x5 over <invalid>) kubelet Started container init-mysql
Warning BackOff <invalid> (x10 over <invalid>) kubelet Back-off restarting failed container
查看pod mysql-0日志
kubectl -n db logs mysql-0
error: a container name must be specified for pod mysql-0, choose one of: [mysql xtrabackup] or one of the init containers: [init-mysql clone-mysql]
kubectl -n db logs mysql-0 init-mysql
++ hostname
bash: line 5: hostname: command not found
+ [[ '' =~ -([0-9]+)$ ]]
+ exit 1
原因：shell 命令hostname不存在，可能时容器bash问题
解决方法：yaml文件中hostname命令改成环境变量$HOSTNAME
#[ `hostname` =~ -([0-9]+)$ ]] || exit 1
[[ $HOSTNAME =~ -([0-9]+)$ ]] || exit 1
删除statefulset后重建
kubectl -n db get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mysql-0 2/2 Running 0 30s 10.122.140.123 node02 <none> <none>
mysql-1 2/2 Running 0 20s 10.122.140.89 node02 <none> <none>
mysql-2 1/2 Running 0 9s 10.122.140.90 node02 <none> <none>
kubectl -n db describe pod
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 64s default-scheduler Successfully assigned db/mysql-2 to node02
Normal Pulled <invalid> kubelet Container image "mysql:5.7" already present on machine
Normal Created <invalid> kubelet Created container init-mysql
Normal Started <invalid> kubelet Started container init-mysql
Normal Pulled <invalid> kubelet Container image "gcr.io/google-samples/xtrabackup:1.0" already present on machine
Normal Created <invalid> kubelet Created container clone-mysql
Normal Started <invalid> kubelet Started container clone-mysql
Normal Pulled <invalid> kubelet Container image "mysql:5.7" already present on machine
Normal Created <invalid> kubelet Created container mysql
Normal Started <invalid> kubelet Started container mysql
Normal Pulled <invalid> kubelet Container image "gcr.io/google-samples/xtrabackup:1.0" already present on machine
Normal Created <invalid> kubelet Created container xtrabackup
Normal Started <invalid> kubelet Started container xtrabackup
k8s MySQL集群创建完成。
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