Kube.netes上运行的MySQL如何连接

Question

I have deployed my application on Google gcloud container engine. My application required MySQL . Application is running fine and connecting to MySQL correctly. But I want to connect MySQL database from my local machine using MySQL Client ( Workbench , or command line), Can some one help me how to expose this to local machine? and how can I open MySQL command line on gcloud shell?

I have run below command but external ip is not there:

$ kubectl get deployment
NAME        DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
app-mysql   1         1         1            1           2m
$ kubectl get pods
NAME                         READY     STATUS             RESTARTS   AGE
app-mysql-3323704556-nce3w   1/1       Running            0          2m
$ kubectl get service
NAME        CLUSTER-IP    EXTERNAL-IP       PORT(S)    AGE
app-mysql   11.2.145.79   <none>            3306/TCP   23h

EDIT

I am using below yml file:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: app-mysql
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: app-mysql
    spec:
      volumes:
      - name: data
        emptyDir: {}
      containers:
      - name: mysql
        image: mysql:5.6.22
        env:
        - name: MYSQL_USER
          value: root
        - name: MYSQL_DATABASE
          value: appdb
        ports:
        - containerPort: 3306
        volumeMounts:
        - name: data
          mountPath: /var/lib/mysql/
---
apiVersion: v1
kind: Service
metadata:
  name: app-mysql
spec:
  selector:
    app: app-mysql
  ports:
  - port: 3306

Answer 1

Try the kubectl port-forward command.

In your case; kubectl port-forward app-mysql-3323704556-nce3w 3306:3306

See The documentation for all available options.

Answer 2

There are 2 steps involved:

1 ) You first perform port forwarding from localhost to your pod:

kubectl port-forward <your-mysql-pod-name> 3306:3306 -n <your-namespace>

2 ) Connect to database:

mysql -u root -h 127.0.0.1 -p <your-password>
 

Notice that you might need to change 127.0.0.1 to localhost - depends on your setup.

If host is set to:
localhost - then a socket or pipe is used.
127.0.0.1 - then the client is forced to use TCP/IP.

You can check if your database is listening for TCP connections with netstat -nlp .

---

Read more in:

Cant connect to local mysql server through socket tmp mysql sock

Can not connect to server

Answer 3

To add to the above answer, when you add --address 0.0.0.0 kubectl should open 3306 port to the INTERNET too (not only localhost)!

kubectl port-forward POD_NAME 3306:3306 --address 0.0.0.0

Use it with caution for short debugging sessions only, on development systems at most. I used it in the following situation:

• colleague who uses Windows
• didn't have ssh key ready
• environment was a playground I was not afraid to expose to the world

Answer 4

You need to add a service to your deployment. The service will add a load balancer with a public ip in front of your pod, so it can be accessed over the public internet.

See the documentation on how to add a service to a Kubernetes deployment . Use the following code to add a service to your app-mysql deployment:

kubectl expose deployment/app-mysql

You may also need to configure your MySQL service so it allows remote connections. See this link on how to enable remote access on MySQL server :