Can't connect to mysql pod in Kubernetes when

Question

I try to setup a mysql database in Kubernetes. I configured a ConfigMap to store the Database name and a Secret that contains the root password, the user and the password for the user.

When I try to connect to the DB afterwards (Inside the container with mysql cli and from outside with IntelliJ Database tool) I get an "ERROR 1045 (28000): Access denied for user 'testadm'@'localhost' (using password: YES)" error.

My kubernetes.yaml file:

apiVersion: v1
kind: ConfigMap
metadata:
  name: db
data:
  mysql-database: database

---
apiVersion: v1
kind: Secret
metadata:
   name: db-credentials
type: Opaque
data:
  mysql-root-password: VGVzdDEyMzQK # Test1234
  mysql-user: dGVzdGFkbQo= # testadm
  mysql-password: VGVzdDEyMzQK # Test1234

---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: mysql
spec:
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
        - name: mysql
          image: mysql:5.7
          ports:
            - containerPort: 3306
          env:
            - name: MYSQL_DATABASE
              valueFrom:
                configMapKeyRef:
                  name: db
                  key: mysql-database
            - name: MYSQL_ROOT_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: db-credentials
                  key: mysql-root-password
            - name: MYSQL_USER
              valueFrom:
                secretKeyRef:
                  name: db-credentials
                  key: mysql-user
            - name: MYSQL_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: db-credentials
                  key: mysql-password

If I set the passwords directly like below the connection succeeds inside of the container and from the outside!

env:
  - name: MYSQL_ROOT_PASSWORD
    value: Test1234

If I inspect the env variables inside the container I can't spot a difference between the two approaches.

Is there any additional formatting required to use the passwords stored in the secret? I also tried to place the values in the data-dictionary in quotes like this:

data:
  mysql-root-password: "VGVzdDEyMzQK"

Version information

Docker 17.06.0-ce
Minikube 0.21.0
Kubectl Server 1.7.0
Kubectl Client 1.7.3

Answer 1

You need to give the access to client machine to connect mysql database.

replace the <ip> address with your desktop ip and run this command on mysql database. then test the connection.

GRANT ALL PRIVILEGES ON *.* TO 'root'@'<ip>'   WITH GRANT OPTION;
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'   WITH GRANT OPTION;
FLUSH PRIVILEGES;

The way you created secret is not correct. remove and create it like this. I tested in my cluster it worked.

kubectl create secret generic db-credentials --from-literal=mysql-root-password=Test1234 --from-literal=mysql-user=testadm --from-literal=mysql-password=Test1234

Answer 2

Are you sure the data in your secret yaml is base64-encoded correctly? Using https://www.base64encode.org/, your data block is supposed to look like:

data:
  mysql-root-password: VGVzdDEyMzQ= # Test1234
  mysql-user: dGVzdGFkbQ== # testadm
  mysql-password: VGVzdDEyMzQ= # Test1234

Answer 3

you can use this yaml file.

apiVersion: v1
kind: Secret
metadata:
   name: db-credentials
type: Opaque
data:
  mysql-password: VGVzdDEyMzQ=
  mysql-root-password: VGVzdDEyMzQ=
  mysql-user: dGVzdGFkbQ==