import mysql data to kubernetes pod

Question

Does anyone know how to import the data inside my dump.sql file to a kubernetes pod either;

Directly,same way as you dealing with docker containers:

docker exec -i container_name mysql -uroot --password=secret database < Dump.sql

Or using the data stored in an existing docker container volume and pass it to the pod .

Answer 1

就像其他人正在寻找这个一样：

kubectl -n namespace exec -i my_sql_pod_name -- mysql -u user -ppassword < my_local_dump.sql

Answer 2

To answer your specific question:

You can kubectl exec into your container in order to run commands inside it. You may need to first ensure that the container has access to the file, by perhaps storing it in a location that the cluster can access (network?) and then using wget/curl within the container to make it available. One may even open up an interactive session with kubectl exec .

However, the ways to do this in increasing measure of generality would be:

1. Create a service that lets you access the mysql instance running on the pod from outside the cluster and connect your local mysql client to it.

2. If you are executing this initialization operation every time such a mysql pod is being started, it could be stored on a persistent volume and you could execute the script within your pod when you start up.

3. If you have several pieces of data that you typically need to copy over when starting the pod, look at init containers for fetching that data.

Answer 3

TL;DR Using ConfigMaps and then use that ConfgMap as a mount into the /docker-entrypoint-initdb.d folder

Code

MySQL Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
spec: 
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  strategy:
    type: Recreate 
  template: 
    metadata: 
      labels: 
        app: mysql
    spec: 
      containers:
        - name: mysql
          image: mysql:5.6
          env:
            - name: MYSQL_ROOT_PASSWORD
              value: dbpassword11
          ports:
            - containerPort: 3306
              name: mysql    
          volumeMounts:
            - name: mysql-persistent-storage
              mountPath: /var/lib/mysql    
            - name: usermanagement-dbcreation-script
              mountPath: /docker-entrypoint-initdb.d #https://hub.docker.com/_/mysql Refer Initializing a fresh instance                                            
      volumes: 
        - name: mysql-persistent-storage
          persistentVolumeClaim:
            claimName: ebs-mysql-pv-claim
        - name: usermanagement-dbcreation-script
          configMap:
            name: usermanagement-dbcreation-script

MySQL ConfigMap

apiVersion: v1
kind: ConfigMap
metadata:
  name: usermanagement-dbcreation-script
data: 
  mysql_usermgmt.sql: |-
    DROP DATABASE IF EXISTS usermgmt;
    CREATE DATABASE usermgmt; 

Reference:

https://github.com/stacksimplify/aws-eks-kubernetes-masterclass/blob/master/04-EKS-Storage-with-EBS-ElasticBlockStore/04-02-SC-PVC-ConfigMap-MySQL/kube-manifests/04-mysql-deployment.yml

https://github.com/stacksimplify/aws-eks-kubernetes-masterclass/blob/master/04-EKS-Storage-with-EBS-ElasticBlockStore/04-02-SC-PVC-ConfigMap-MySQL/kube-manifests/03-UserManagement-ConfigMap.yml