mkdir /mnt/data: 只读文件系统退避重启失败的 postgres 容器
mkdir /mnt/data: read-only file system Back-off restarting failed postgres container
我是 Kubernetes 的新手,我尝试应用 yaml 文件在 GKE 中创建 Postgres,我收到错误消息“错误:无法启动容器“postgres”:来自守护进程的错误响应:创建挂载时出错源路径“/mnt/data”:mkdir /mnt/data:只读 文件系统退避重启失败的容器。
我认为我需要将权限授予 RWX,当我尝试登录到 pod,即在容器内时。它不允许登录。
任何人都请帮助我!!
这是我的 Postgres Yaml 文件:
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
在你的 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 中。如果你将 SSH 连接到你的任何节点,你会发现这个文件夹是 ReadOnly file system
.
/mnt $ mkdir 东西
mkdir:无法创建目录‘something’:只读文件系统
作为最快的解决方法,您只需更改 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,如果您将通过 SSH 连接到托管此 pod 的节点,您将能够访问此文件夹和文件。
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
我用过 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
如果您使用的是 GKE,只需创建 PVC,它会自行创建 PV,根据您的需要工作。
我这样解决了我的问题。
我是 Kubernetes 的新手,我尝试应用 yaml 文件在 GKE 中创建 Postgres,我收到错误消息“错误:无法启动容器“postgres”:来自守护进程的错误响应:创建挂载时出错源路径“/mnt/data”:mkdir /mnt/data:只读 文件系统退避重启失败的容器。
我认为我需要将权限授予 RWX,当我尝试登录到 pod,即在容器内时。它不允许登录。
这是我的 Postgres Yaml 文件:
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
在你的 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 中。如果你将 SSH 连接到你的任何节点,你会发现这个文件夹是 ReadOnly file system
.
/mnt $ mkdir 东西 mkdir:无法创建目录‘something’:只读文件系统
作为最快的解决方法,您只需更改 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,如果您将通过 SSH 连接到托管此 pod 的节点,您将能够访问此文件夹和文件。
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
我用过 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
如果您使用的是 GKE,只需创建 PVC,它会自行创建 PV,根据您的需要工作。
我这样解决了我的问题。