Part 5: Deployment of Container through Docker Compose File
In this part, we will look at an interesting example to deploy multiple containers just by docker compose file.
We don’t need to do anything just need to write our compose file and that too from the Docker HUB.
Lets see an example.
1. Create docker-compose.yml file
$ mkdir compose_example1
$ cd compose_example1/
$ ls -ltr
$
$ cat docker-compose.yml
version: '3'
services:
webserver:
image: nginx
ports:
- 5003:80
database:
image: redis
### Verify if everything if fine
### Using config option
$ docker-compose config
services:
database:
image: redis
ports:
- 5003:80
webserver:
image: nginx
version: '3.0'
2. Build and run the docker-compose file configuration.
### Create and start the containers. $ docker-compose up -d Creating network "compose_example1_default" with the default driver Pulling web (nginx:)... latest: Pulling from library/nginx 177e7ef0df69: Already exists ea57c53235df: Pull complete bbdb1fbd4a86: Pull complete Pulling database (redis:)... latest: Pulling from library/redis 177e7ef0df69: Already exists 66ec699db42d: Pull complete 9af6d87fd347: Pull complete de9172cdb09c: Pull complete 27733a222e28: Pull complete ef1ae1903ba4: Pull complete Creating compose_example1_web_1 ... done Creating compose_example1_database_1 ... done $ $ docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES f986b22a7ce6 nginx "nginx -g 'daemon of…" 2 minutes ago Up 2 minutes 80/tcp compose_example1_webserver_1 be3a1d0ea17f redis "docker-entrypoint.s…" 2 minutes ago Up 2 minutes 6379/tcp compose_example1_database_1 $ ### Stop the container services $ docker-compose down Stopping compose_example1_webserver_1 ... done Stopping compose_example1_database_1 ... done Removing compose_example1_webserver_1 ... done Removing compose_example1_database_1 ... done Removing network compose_example1_default $ docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3. Check this out in browser.
### If you open the post 5003 which is forwarded in docker compose file, ### you can see the nginx server output.
To scale a container service to replicate it, we can use scale option:
$ docker-compose up -d –scale database=2
Creating network “compose_example1_default” with the default driver
Creating compose_example1_database_1 … done
Creating compose_example1_database_2 … done
Creating compose_example1_web_1 … done
$
$ docker-compose up -d –scale database=2
Creating network “compose_example1_default” with the default driver
Creating compose_example1_database_1 … done
Creating compose_example1_database_2 … done
Creating compose_example1_web_1 … done
$