Docker Volume

• Used to maintain the persistent data

Types of Applications on Container Perspective :

• Stateless Applications

• Stateful Applications

docker volume create <volume_name>

• Create a Docker Volume in Host Machine

  • 

docker volume list

• To get the list of volumes

  • 

docker volume inspect <volume_name>

• Get the properties of created volume

  • 

docker run -it --mount <source=volume>name>,<destination=destination_location> <container_image> bash

• To mount the volume to the required location

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  • 

Container Orchestration

Overview of Docker Compose

• Is used to run the multiple containers as a service

• Docker compose is the default package of container engine

• Docker compose is an extension/plugins to docker

Steps to run multiple container as a service

• First install the docker compose

  • //https://docs.docker.com/compose/install/linux/

    • DOCKER_CONFIG=${DOCKER_CONFIG:-$HOME/.docker}

    • mkdir -p $DOCKER_CONFIG/cli-plugins

    • curl -SL https://github.com/docker/compose/releases/download/v2.18.1/docker-compose-linux-x86_64 -o $DOCKER_CONFIG/cli-plugins/docker-compose

  • chmod +x $DOCKER_CONFIG/cli-plugins/docker-compose

  • docker compose version

  • 

• Create a manifest/config file ==> Is written using yaml script.

  • vi docker-compose.yaml

  •   version: '3'
      services:
        webserv:
          image: "tomcat:8.0"
          ports:
            - 8098:8080
        dbserv:
          image: "redis:alpine"
    

• docker compose up - Start all the container as defined in docker-compose file

  • 

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• docker compose down - Stop all the container as defined in docker-compose file

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Docker Swarm

• Docker swarm is one of the Container orchestration tool

• It is meant only for docker containers

• Used to ensure high availability of the containers by creating Replicas of containers

• We cannot to Auto scaling and load balancing