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  • [Docker] Converting from Docker Compose to Kubernetes

    kompose is a tool to help users who are familiar with docker-compose move to Kubernetes. kompose takes a Docker Compose file and translates it into Kubernetes resources.

    kompose is a convenience tool to go from local Docker development to managing your application with Kubernetes. Transformation of the Docker Compose format to Kubernetes resources manifest may not be exact, but it helps tremendously when first deploying an application on Kubernetes.

    Install:

    curl -L https://github.com/kubernetes/kompose/releases/download/v1.18.0/kompose-darwin-amd64 -o kompose
    
    chmod +x kompose
    sudo mv ./kompose /usr/local/bin/kompose

    We have a Docker compose file which setup Node, Nginx, Redis, MongoDB.

        # 1. Update config values (localhost --> mongo and localhost --> redis) in config/config.development.json if necessary.
        # 2. Set APP_ENV environment variable by running the following command in your commnand window (see the notes below if on Windows).
    
        #    export APP_ENV=development or export APP_ENV=production
        #    export DOCKER_ACCT=codewithdan
    
        #    NOTE: If you're on Windows use one of the following commands to create the environment variables.
        #    Use 'codewithdan' for the account if you want to run in Kubernetes (see the readme). Otherwise, you can substitute your own
        #    Docker account for the value if you'd like.
    
        #    For the standard Windows DOS command shell use `set` instead of `export` for environment variables.
        #    For Windows Powershell use $env:APP_ENV = "value".
    
        # 3. Remove "node" service volume (below) if doing a production build
        # 4. Run docker-compose build
        # 5. Run docker-compose up
        # 6. Live long and prosper
    
    version: "3.1"
    
    services:
        nginx:
          container_name: nginx
          image: ${DOCKER_ACCT}/nginx
          build:
            context: .
            dockerfile: .docker/nginx.${APP_ENV}.dockerfile
          # links are deprecated (networks are used instead for communication and
          # depends_on for upstream node name in nginx config)
          # links:
          #   - node1:node1
          #   - node2:node2
          #   - node3:node3
          depends_on:
            - node
          ports:
            - "80:80"
            - "443:443"
          networks:
            - codewithdan-network
    
        node:
          container_name: node-codewithdan
          image: ${DOCKER_ACCT}/node-codewithdan
          build:
            context: .
            dockerfile: .docker/node-codewithdan.${APP_ENV}.dockerfile
          ports:
          - "8080"
          volumes:
            - .:/var/www/codewithdan
          working_dir: /var/www/codewithdan
          env_file:
            - ./.docker/env/app.${APP_ENV}.env
          depends_on:
            - mongo
            - redis
          networks:
            - codewithdan-network
    
        # Removing these for those wanting to run Kubernetes as well (since replica sets would scale pods with containers)
        # node2:
        #   container_name: node-codewithdan-2
        #   image: ${DOCKER_ACCT}/node-codewithdan
        #   build:
        #     context: .
        #     dockerfile: .docker/node-codewithdan.${APP_ENV}.dockerfile
        #   ports:
        #   - "8080"
        #   volumes:
        #     - .:/var/www/codewithdan
        #   working_dir: /var/www/codewithdan
        #   env_file:
        #     - ./.docker/env/app.${APP_ENV}.env
        #   depends_on:
        #     - mongo
        #     - redis
        #   networks:
        #     - codewithdan-network
    
        # node3:
        #   container_name: node-codewithdan-3
        #   image: ${DOCKER_ACCT}/node-codewithdan
        #   build:
        #     context: .
        #     dockerfile: .docker/node-codewithdan.${APP_ENV}.dockerfile
        #   ports:
        #   - "8080"
        #   volumes:
        #     - .:/var/www/codewithdan
        #   working_dir: /var/www/codewithdan
        #   env_file:
        #     - ./.docker/env/app.${APP_ENV}.env
        #   depends_on:
        #     - mongo
        #     - redis
        #   networks:
        #     - codewithdan-network
    
        mongo:
          container_name: mongo
          image: ${DOCKER_ACCT}/mongo
          build:
            context: .
            dockerfile: .docker/mongo.dockerfile
          ports:
          - "27017:27017"
          env_file:
            - ./.docker/env/mongo.${APP_ENV}.env
          networks:
            - codewithdan-network
    
        redis:
          container_name: redis
          image: ${DOCKER_ACCT}/redis
          build:
            context: .
            dockerfile: .docker/redis.${APP_ENV}.dockerfile
          ports:
            - "6379"
          networks:
            - codewithdan-network
    
        # cadvisor:
        #   container_name: cadvisor
        #   image: google/cadvisor
        #   volumes:
        #     - /:/rootfs:ro
        #     - /var/run:/var/run:rw
        #     - /sys:/sys:ro
        #     - /var/lib/docker/:/var/lib/docker:ro
        #   ports:
        #     - "8080:8080"
        #   networks:
        #     - codewithdan-network
    
    networks:
        codewithdan-network:
          driver: bridge

    Run:

    export APP_ENV=development
    // or export APP_ENV=production
    
    export DOCKER_ACCT=codewithdan

    Then, we can convert Docker compose file to Kubernetes files:

    kompose conver // create multi yml files for each services
    // or output only one file
    kompose conver --out test.yml

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  • 原文地址:https://www.cnblogs.com/Answer1215/p/10703031.html
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