我正在按照kubernetes官方文档中的说明使用mysql创建一个简单的有状态应用程序，但是它确实对我有用，我想知道是否有人可以在两分钟内在自己的GCP中对其进行测试，看看是否我是唯一一个有示例问题的人，它不起作用：
https://kubernetes.io/docs/tasks/run-application/run-single-instance-stateful-application/
这些是文档中的文件：
application / mysql / mysql-deployment.yaml
apiVersion: v1
kind: Service
metadata:
name: mysql
spec:
ports:
- port: 3306
selector:
app: mysql
clusterIP: None
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: mysql
spec:
selector:
matchLabels:
app: mysql
strategy:
type: Recreate
template:
metadata:
labels:
app: mysql
spec:
containers:
- image: mysql:5.6
name: mysql
env:
# Use secret in real usage
- name: MYSQL_ROOT_PASSWORD
value: password
ports:
- containerPort: 3306
name: mysql
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim
application / mysql / mysql-pv.yaml
kind: PersistentVolume
apiVersion: v1
metadata:
name: mysql-pv-volume
labels:
type: local
spec:
storageClassName: manual
capacity:
storage: 20Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 20Gi
注意：我正在做几次尝试，因此pod名称可能会有所不同...
看起来一切都很好，但是我遇到了CrashLoopBackOff：
xxx@cloudshell:~ (academic-veld-230622)$ gcloud container clusters get-credentials standard-cluster-1 --zone us-central1-a --project academic-veld-230622
Fetching cluster endpoint and auth data.
kubeconfig entry generated for standard-cluster-1.
xx@cloudshell:~ (academic-veld-230622)$ kubectl apply -f https://k8s.io/examples/application/mysql/mysql-pv.yaml
persistentvolume/mysql-pv-volume created
persistentvolumeclaim/mysql-pv-claim created
xxx@cloudshell:~ (academic-veld-230622)$ kubectl apply -f https://k8s.io/examples/application/mysql/mysql-deployment.yaml
service/mysql created
deployment.apps/mysql created
@cloudshell:~ (academic-veld-230622)$ kubectl describe deployment mysql
Name: mysql
Namespace: default
CreationTimestamp: Thu, 11 Apr 2019 18:46:58 +0200
Labels: <none>
Annotations: deployment.kubernetes.io/revision=1
kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"apps/v1","kind":"Deployment","metadata":{"annotations":{},"name":"mysql","namespace":"default"},"spec":{"selector":{"matchLabels":{"app"...
Selector: app=mysql
Replicas: 1 desired | 1 updated | 1 total | 0 available | 1 unavailable
StrategyType: Recreate
MinReadySeconds: 0
Pod Template:
Labels: app=mysql
Containers:
mysql:
Image: mysql:5.6
Port: 3306/TCP
Host Port: 0/TCP
Environment:
MYSQL_ROOT_PASSWORD: password
Mounts:
/var/lib/mysql from mysql-persistent-storage (rw)
Volumes:
mysql-persistent-storage:
Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
ClaimName: mysql-pv-claim
ReadOnly: false
Conditions:
Type Status Reason
---- ------ ------
Available False MinimumReplicasUnavailable
Progressing True ReplicaSetUpdated
OldReplicaSets: <none>
NewReplicaSet: mysql-fb75876c6 (1/1 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 34s deployment-controller Scaled up replica set mysql-fb75876c6 to 1
xxxx@cloudshell:~ (academic-veld-230622)$ kubectl get pods -l app=mysql
NAME READY STATUS RESTARTS AGE
mysql-fb75876c6-522j9 0/1 RunContainerError 4 1m
xxx@cloudshell:~ (academic-veld-230622)$ kubectl get pods -l app=mysql
NAME READY STATUS RESTARTS AGE
mysql-fb75876c6-522j9 0/1 CrashLoopBackOff 6 7m
@cloudshell:~ (academic-veld-230622)$ kubectl describe pvc mysql-pv-claim
Name: mysql-pv-claim
Namespace: default
StorageClass: manual
Status: Bound
Volume: mysql-pv-volume
Labels: <none>
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"PersistentVolumeClaim","metadata":{"annotations":{},"name":"mysql-pv-claim","namespace":"default"},"spec":{"accessModes":["R...
pv.kubernetes.io/bind-completed=yes
pv.kubernetes.io/bound-by-controller=yes
Finalizers: [kubernetes.io/pvc-protection]
Capacity: 20Gi
Access Modes: RWO
Events: <none>
在更大的计算机上登录第二次尝试：
@cloudshell:~ (academic-veld-230622)$ kubectl logs mysql-fb75876c6-ctchn --previous
failed to open log file "/var/log/pods/68c34d6f-5c7d-11e9-9029-42010a800043/mysql/5.log": open /var/log/pods/68c34d6f-5c7d-11e9-9029-42010a800043/mysql/5.log: no such file or directorymasuareza@cloudshell:~ (academic-veld-230622)$
Going into the console:
https://console.cloud.google.com/logs/viewer?interval=NO_LIMIT&project=academic-veld-230622&authuser=0&minLogLevel=0&expandAll=false×tamp=2019-04-11T17%3A25%3A37.805000000Z&customFacets&limitCustomFacetWidth=true&advancedFilter=resource.type%3D%22k8s_cluster%22%0Aresource.labels.project_id%3D%22academic-veld-230622%22%0Aresource.labels.cluster_name%3D%22standard-cluster-1%22%0Aresource.labels.location%3D%22us-central1-a%22%0Atimestamp%3D%222019-04-11T17%3A15%3A30.999350000Z%22%0AinsertId%3D%22d99409fb-66f8-4eab-8066-6c8b976aaec8%22&scrollTimestamp=2019-04-11T17%3A15%3A30.999350000Z
第三次尝试：
Showing logs from all time (CEST)
No older entries found matching current filter.
2019-04-11 19:39:54.278 CEST
k8s.io
create
default:mysql-fb75876c6-r42x6:mysql-fb75876c6-r42x6
system:kube-scheduler
{"@type":"type.googleapis.com/google.cloud.audit.AuditLog","authenticationInfo":{"principalEmail":"system:kube-scheduler"},"authorizationInfo":[{"granted":true,"permission":"io.k8s.core.v1.pods.binding.create","resource":"core/v1/namespaces/default/pods/mysql-fb75876c6-r42x6/binding/mysql-fb75876c6-…
Expand all | Collapse all {
insertId: "39605b90-16dd-470b-996f-b072fb262595"
labels: {…}
logName: "projects/academic-veld-230622/logs/cloudaudit.googleapis.com%2Factivity"
operation: {…}
protoPayload: {…}
receiveTimestamp: "2019-04-11T17:40:22.506801591Z"
resource: {…}
timestamp: "2019-04-11T17:39:54.278100Z"
}
DESCRIBE POD:
@cloudshell:~ (academic-veld-230622)$ kubectl describe pod mysql-fb75876c6-r42x6
Name: mysql-fb75876c6-r42x6
Namespace: default
Priority: 0
PriorityClassName: <none>
Node: gke-standard-cluster-1-default-pool-119c7a9c-5jp1/10.150.0.15
Start Time: Thu, 11 Apr 2019 19:39:54 +0200
Labels: app=mysql
pod-template-hash=963143272
Annotations: kubernetes.io/limit-ranger=LimitRanger plugin set: cpu request for container mysql
Status: Running
IP: 10.48.0.13
Controlled By: ReplicaSet/mysql-fb75876c6
Containers:
mysql:
Container ID: docker://63fbbebe5d246f56299b0194ed34ca3614349db1ab96251e23d098b0efbcac4b
Image: mysql:5.6
Image ID: docker-pullable://mysql@sha256:5ab881bc5abe2ac734d9fb53d76d984cc04031159152ab42edcabbd377cc0859
Port: 3306/TCP
Host Port: 0/TCP
State: Waiting
Reason: CrashLoopBackOff
Last State: Terminated
Reason: ContainerCannotRun
Message: error while creating mount source path '/mnt/data': mkdir /mnt/data: read-only file system
Exit Code: 128
Started: Thu, 11 Apr 2019 19:45:40 +0200
Finished: Thu, 11 Apr 2019 19:45:40 +0200
Ready: False
Restart Count: 6
Requests:
cpu: 100m
Environment:
MYSQL_ROOT_PASSWORD: password
Mounts:
/var/lib/mysql from mysql-persistent-storage (rw)
/var/run/secrets/kubernetes.io/serviceaccount from default-token-rrhql (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
mysql-persistent-storage:
Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
ClaimName: mysql-pv-claim
ReadOnly: false
default-token-rrhql:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-rrhql
Optional: false
QoS Class: Burstable
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 Scheduled 10m default-scheduler Successfully assigned default/mysql-fb75876c6-r42x6 to gke-standard-cluster-1-default-pool-119c7a9c-5jp1
Normal Pulling 10m kubelet, gke-standard-cluster-1-default-pool-119c7a9c-5jp1 pulling image "mysql:5.6"
Normal Pulled 10m kubelet, gke-standard-cluster-1-default-pool-119c7a9c-5jp1 Successfully pulled image "mysql:5.6"
Normal Created 9m (x5 over 10m) kubelet, gke-standard-cluster-1-default-pool-119c7a9c-5jp1 Created container
Warning Failed 9m (x5 over 10m) kubelet, gke-standard-cluster-1-default-pool-119c7a9c-5jp1 Error: failed to start container "mysql": Error response from daemon: error while creating mount source path '/mnt/data': mkdir /mnt/data: read-only file system
Normal Pulled 9m (x4 over 10m) kubelet, gke-standard-cluster-1-default-pool-119c7a9c-5jp1 Container image "mysql:5.6" already present on machine
Warning BackOff 46s (x43 over 10m) kubelet, gke-standard-cluster-1-default-pool-119c7a9c-5jp1 Back-off restarting failed container
failed to start container "6562e2c146ecf2087d438141550e385a1abf83de8ef1dd7a6fdca61d97576741": Error response from daemon: error while creating mount source path '/mnt/data': mkdir /mnt/data: read-only file system: RunContainerError
PV和PVC：
(unique-poetry-233821)$ kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
mysql-pv-volume 20Gi RWO Retain Bound default/mysql-pv-claim manual 30m
@cloudshell:~ (unique-poetry-233821)$ kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
mysql-pv-claim Bound mysql-pv-volume 20Gi RWO manual 31m
答案 0 :(得分：1)
删除您的PV定义。创建一个StorageClass，它应该可以工作
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 20Gi
---
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
name: manual
provisioner: kubernetes.io/gce-pd
parameters:
type: pd-standard
replication-type: none
答案 1 :(得分：1)
req.userkubectl get pvc,vc