mkdir/mnt/data:只读文件系统后退，重新启动失败的postgres容器 [英] mkdir /mnt/data: read-only file system Back-off restarting failed postgres container
问题描述
我是Kubernetes的新手，我试图应用yaml文件在GKE中创建Postgres，但由于错误:无法启动容器" postgres"而收到错误消息:来自守护程序的错误响应:创建挂载时出错源路径'/mnt/data': mkdir/mnt/data:只读文件系统.后退，重新启动失败的容器.
I'm new to Kubernetes, I tried to apply yaml file to create Postgres in GKE, I'm getting error as "Error: failed to start container "postgres": Error response from daemon: error while creating mount source path '/mnt/data': mkdir /mnt/data: read-only file system Back-off restarting failed container.
当我尝试登录到容器(即容器内)时，我想我需要给以RWX作为权限.它不允许登录.谁请帮我!!.
I thinki need to give permsions as RWX , when i tried to Login to pod i.e inside container..It is not allowing to login. ANyone please help me !!.
这是我的Postgres Yaml文件:
This is my Yaml file for Postgres:
apiVersion: apps/v1
kind: Deployment
metadata:
name: postgres
spec:
selector:
matchLabels:
app: postgres
replicas: 1
template:
metadata:
labels:
app: postgres
spec:
containers:
- name: postgres
image: postgres:latest
imagePullPolicy: "IfNotPresent"
envFrom:
- configMapRef:
name: postgres-config
volumeMounts:
- mountPath: /var/lib/postgresql/data
name: postgredb
volumes:
- name: postgredb
persistentVolumeClaim:
claimName: postgres-pv-claim
---
kind: PersistentVolume
apiVersion: v1
metadata:
name: postgres-pv-volume
labels:
type: local
app: postgres
spec:
storageClassName: manual
capacity:
storage: 5Gi
accessModes:
- ReadWriteMany
hostPath:
path: "/mnt/data"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: postgres-pv-claim
labels:
app: postgres
spec:
storageClassName: manual
accessModes:
- ReadWriteMany
resources:
requests:
storage: 5Gi
---
apiVersion: v1
kind: ConfigMap
metadata:
name: postgres-config
labels:
app: postgres
data:
POSTGRES_DB: postgresdb
POSTGRES_USER: postgres
POSTGRES_PASSWORD: root
---
apiVersion: v1
kind: Service
metadata:
name: postgres
labels:
app: postgres
spec:
ports:
- name: postgres
port: 5432
nodePort: 30432
type: NodePort
selector:
app: postgres
推荐答案
在您的持久卷使用的是 type:local ，这意味着您要在/mnt 中创建目录.本地也不支持动态卷配置.如果您将SSH到您的任何节点，则会发现此文件夹为 ReadOnly文件系统.
In your Persistent Volume you are using type: local which means that you want to create directory in /mnt. Local also do not support dynamic volume provisioning. If you will SSH to any of your nodes you will find that this folder is ReadOnly file system.
/mnt $ mkdir一些东西mkdir:无法创建目录"something":只读文件系统
/mnt $ mkdir something mkdir: cannot create directory ‘something’: Read-only file system
作为最快的解决方法，您只需更改PV YAML
As fastest workaround, you just could change in your PV YAML
- ReadWriteMany
hostPath:
path: /mnt/data
收件人:
- ReadWriteMany
hostPath:
path: /var/lib/data
示例:
$ kubectl apply -f pv-pvc.yaml
persistentvolume/postgres-pv-volume created
persistentvolumeclaim/postgres-pv-claim created
$ kubectl apply -f pos.yaml
deployment.apps/postgres created
$ kubectl get po
NAME READY STATUS RESTARTS AGE
postgres-65d9cbd495-pcqf5 1/1 Running 0 2s
$ kubectl exec -ti postgres-65d9cbd495-pcqf5 -- /bin/bash
root@postgres-65d9cbd495-pcqf5:/# cd /var/lib/postgresql/data
root@postgres-65d9cbd495-pcqf5:/var/lib/postgresql/data# ls
base pg_commit_ts pg_hba.conf pg_logical pg_notify pg_serial pg_stat pg_subtrans pg_twophase pg_wal postgresql.auto.conf postmaster.opts
global pg_dynshmem pg_ident.conf pg_multixact pg_replslot pg_snapshots pg_stat_tmp pg_tblspc PG_VERSION pg_xact postgresql.conf postmaster.pid
root@postgres-65d9cbd495-pcqf5:/var/lib/postgresql/data# echo "Hello from postgress pod" > data.txt
root@postgres-65d9cbd495-pcqf5:/var/lib/postgresql/data# cat data.txt
Hello from postgress pod
现在，如果您要通过SSH到托管此Pod的节点，则可以访问此文件夹和文件.
Now if you will SSH to the node which is hosting this pod, you will be able to reach this folder and files.
user@gke-cluster-1-default-pool-463f9615-gxhl ~ $ sudo su
gke-cluster-1-default-pool-463f9615-gxhl /home/user # cd /var/lib/data
gke-cluster-1-default-pool-463f9615-gxhl /var/lib/data # ls
PG_VERSION pg_dynshmem pg_notify pg_stat_tmp pg_xact
base pg_hba.conf pg_replslot pg_subtrans postgresql.auto.conf
data.txt pg_ident.conf pg_serial pg_tblspc postgresql.conf
global pg_logical pg_snapshots pg_twophase postmaster.opts
pg_commit_ts pg_multixact pg_stat pg_wal postmaster.pid
gke-cluster-1-default-pool-463f9615-gxhl /var/lib/data # cat data.txt
Hello from postgress pod
编辑
我使用过的YAML.
apiVersion: v1
kind: ConfigMap
metadata:
name: postgres-config
labels:
app: postgres
data:
POSTGRES_DB: postgresdb
POSTGRES_USER: postgres
POSTGRES_PASSWORD: root
---
apiVersion: v1
kind: Service
metadata:
name: postgres
labels:
app: postgres
spec:
type: NodePort
selector:
app: postgres
ports:
- name: postgres
port: 5432
nodePort: 30432
---
kind: PersistentVolume
apiVersion: v1
metadata:
name: postgres-pv-volume
labels:
app: postgres
type: local
spec:
storageClassName: manual
capacity:
storage: 5Gi
accessModes:
- ReadWriteMany
hostPath:
path: /var/lib/data
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: postgres-pv-claim
labels:
app: postgres
spec:
storageClassName: manual
accessModes:
- ReadWriteMany
resources:
requests:
storage: 5Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: postgres
spec:
replicas: 1
selector:
matchLabels:
app: postgres
template:
metadata:
labels:
app: postgres
spec:
containers:
- name: postgres
image: postgres:latest
imagePullPolicy: "IfNotPresent"
envFrom:
- configMapRef:
name: postgres-config
volumeMounts:
- mountPath: /var/lib/postgresql/data
name: postgredb
volumes:
- name: postgredb
persistentVolumeClaim:
claimName: postgres-pv-claim
configmap/postgres-config created
service/postgres created
persistentvolume/postgres-pv-volume created
persistentvolumeclaim/postgres-pv-claim created
deployment.apps/postgres created
$ kubectl get po
NAME READY STATUS RESTARTS AGE
postgres-65d9cbd495-wxx4h 1/1 Running 0 19s
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