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Ex2.1: Multiple containers - docker commands

Start nginx container

$ docker container run -d --name my_proxy -p 80:80 nginx:alpine

Start apache container

$ docker container run -d --name my_web -p 8081:80 httpd:alpine

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Ex2.2: Alpine linux container

Start alpine linux container, use 'Ctrl+pq' to exit without stopping container

$ docker container run -it --name my_alpine alpine sh

Reattach to the running container

$ docker container attach my_alpine

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Ex2.3: Ubuntu shell and CURL installation

Start Ubuntu Xenial container

$ docker container run -d -it --name my_ubuntu ubuntu:xenial

Inside Ubuntu container, update and install CURL

Note: make sure the DNS works fine in the container.

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Ex2.4: Docker Network

List all docker networks

$ docker network ls

** sample output **

NETWORK ID NAME DRIVER SCOPE

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Ex2.5: Multiple virtual docker network

Create 'my_web_net' and 'my_api_net' virtual network

$ docker network create my_web_net $ docket network create my_api_net $ docker network ls sample output:

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Example: DNS round-robin

This mechanism can be use for loadbalancing web application

Here we will implement load balance 'Elasticsearch". What is Elasticsearch?

Create a virtual network and two elasticsearch containers with the same 'alias name'

$ docker network create dude
$ docker container run -d --net dude --net-alias search elasticsearch:2

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Ex2.6: Wordpress Application

Start MySQL container with specified MySQL root password

$ docker container run -d --name my_db -e MYSQL_ROOT_PASSWORD=1234 mysql:5.7

Start Wordpress container and 'link' with MySQL container

` $ docker container run --name my_wordpress --link my_mysql:mysql -p 8081:80 wordpress

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Example#3.1: How to create, test, tag, push and pull an Nginx docker image

On Ubuntu Docker host, create an empty directory, ~/example31

$ mkdir example31
$ cd example31

Create index.html and about.html inside the example31 directory

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Example#3.3: How to deploy a simple Node.js+MongoDB app

Clone a Node.js application from GitHub

First, clone from the following URL to Ubuntu VM:

https://github.com/potikanond/docker-node-sample3.git

On Ubuntu VM run the following command:

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Example#3.8: Automate the build and deployment of Node.js+MongoDB app process

This example shows how to use docker-compose to help deploy multiple containers at once. We need to create a docker-compose.yml which is in the YAML format. This file describes the docker engine how to create the Node.js and MongoDB containers. The Node.js container will be build from its Dockerfile inside the application directory. While the MongoDB container will be created from the MongodB official image.

Note: we will work on this example in the directory of project docker-node-sample3.