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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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Ex2.5: 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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Ex2.4: Docker Network

List all docker networks

$ docker network ls

** sample output **

NETWORK ID NAME DRIVER SCOPE

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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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Ex2.2: 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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Ex2.1: 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