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Today, I will talk to you about how to persist postgresql through nfs-server on kuebernetes. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

Kubernetes provides a variety of ways to persist data. See the official website here that we use nfs-server to persist data. Just start deploying our Postgresql.

1. Initialize the configuration of postgresql

File: 01-postgresql-configmap.yaml

ApiVersion: v1

Kind: ConfigMap

Metadata:

Name: postgres-config

Namespace: kube-ops

Labels:

App: postgres-prom

Data:

POSTGRES_DB: postgresdb

POSTGRES_USER: postgresadmin

POSTGRES_PASSWORD: admin1232. Create the corresponding storage volume

File: 02-postgresql-pv.yaml, note here that we need to prepare nfs-server in advance and expose the / data directory for network storage

ApiVersion: v1

Kind: PersistentVolume

Metadata:

Name: postgres-pv-volume

Spec:

Capacity:

Storage: 10Gi

AccessModes:

-ReadWriteOnce

PersistentVolumeReclaimPolicy: Recycle

Nfs:

Server: 192.168.10.234path: / data

-

ApiVersion: v1

Kind: PersistentVolumeClaim

Metadata:

Name: postgres-pv-claim

Namespace: kube-ops

Spec:

AccessModes:

-ReadWriteOnce

Resources:

Requests:

Storage: 10Gi3. Deploy PostgraSQL

When existing services use nfs as local persistent storage, we initialize errors when we start postgresql directly, so we can use subPath: postgresql to distinguish

File: 03-postgresql-dp.yaml

ApiVersion: extensions/v1beta1

Kind: Deployment

Metadata:

Name: postgres-prom

Namespace: kube-ops

Spec:

Replicas: 1template:

Metadata:

Labels:

App: postgres-prom

Spec:

Containers:

-name: postgres

Image: postgres:10.4imagePullPolicy: "IfNotPresent" ports:

-containerPort: 5432envFrom:

-configMapRef:

Name: postgres-config

VolumeMounts:

-mountPath: / var/lib/postgresql/data

SubPath: postgresql

Name: postgredb

Volumes:

-name: postgredb

PersistentVolumeClaim:

ClaimName: postgres-pv-claim4. Expose postgresql services

File: 04-postgresql-svc.yaml

ApiVersion: v1

Kind: Service

Metadata:

Name: postgres

Namespace: kube-ops

Labels:

App: postgres-prom

Spec:type: NodePort

Ports:

-port: 5432selector:

App: postgres-prom

These are the files needed to deploy postgresql, and when everything is ready, we can begin to deploy

Kubectl apply-f.

➜13-1-postgresql git: (master) ✗ (☸ kubernetes-admin@kubernetes:default) k get pods-n kube-ops-o wide-l app=postgres-prom

NAME READY STATUS RESTARTS AGE IP NODE

Postgres-prom-6f54c97948-fp8th 1/1 Running 0 18m 10.244.2.63 dev-k8s-node1

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