Ubuntu 18.04
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Docker : Use Docker Compose
2018/06/12
 
To Install Docker Compose, it's easy to configure and run multiple containers as a Docker application.
[1] Install Docker Compose.
root:~#
apt -y install docker-compose
[2] For example, Configure an application that has WEB and DB services with Docker Compose.
# define WEB service container

root@dlp:~#
vi Dockerfile
FROM ubuntu
MAINTAINER ServerWorld <admin@srv.world>

RUN apt-get update
RUN apt-get -y install apache2

EXPOSE 80
CMD ["/usr/sbin/apachectl", "-D", "FOREGROUND"]

# define application configration

root@dlp:~#
vi docker-compose.yml
version: '3'
services:
  db:
    image: mariadb
    volumes:
      - /var/lib/docker/disk01:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_USER: bionic
      MYSQL_PASSWORD: password
      MYSQL_DATABASE: bionic_db
    ports:
      - "3306:3306"
  web:
    build: .
    ports:
      - "80:80"
    volumes:
      - /var/lib/docker/disk02:/var/www/html

# buid and run

root@dlp:~#
docker-compose up -d

Building web
Step 1/6 : FROM ubuntu
 ---> 113a43faa138
Step 2/6 : MAINTAINER ServerWorld <admin@srv.world>
 ---> Using cache
 ---> 6fdcd1fb1603
Step 3/6 : RUN apt-get update
 ---> Using cache
 ---> 6fd58799374c
.....
.....
Starting root_db_1 ...
Starting root_db_1
Creating root_web_1 ...
Creating root_web_1 ... done

root@dlp:~#
docker ps

CONTAINER ID   IMAGE      COMMAND                  CREATED          STATUS          PORTS                    NAMES
2e873214fcf9   root_web   "/usr/sbin/apachectl…"  30 seconds ago   Up 27 seconds   0.0.0.0:80->80/tcp       root_web_1
ee9472495571   mariadb    "docker-entrypoint.s…"  22 minutes ago   Up 29 seconds   0.0.0.0:3306->3306/tcp   root_db_1

# verify accesses

root@dlp:~#
mysql -h 127.0.0.1 -u root -p -e "show variables like 'hostname';"

Enter password:
+---------------+--------------+
| Variable_name | Value        |
+---------------+--------------+
| hostname      | ee9472495571 |
+---------------+--------------+

root@dlp:~#
mysql -h 127.0.0.1 -u bionic -p -e "show databases;"

Enter password:
+--------------------+
| Database           |
+--------------------+
| bionic_db          |
| information_schema |
+--------------------+

root@dlp:~#
echo "Hello Docker Compose World" > /var/lib/docker/disk02/index.html

root@dlp:~#
curl 127.0.0.1

Hello Docker Compose World
[3] Other basic operations of Docker Compose are follows.
# verify state of containers

root@dlp:~#
docker-compose ps

   Name                 Command               State           Ports
----------------------------------------------------------------------------
root_db_1    docker-entrypoint.sh mysqld      Up      0.0.0.0:3306->3306/tcp
root_web_1   /usr/sbin/apachectl -D FOR ...   Up      0.0.0.0:80->80/tcp

# show logs of containers

root@dlp:~#
docker-compose logs

db_1   | 2018-06-12  4:35:23 0 [Note] mysqld (mysqld 10.3.7-MariaDB-1:10.3.7+maria~jessie) starting as process 1 ...
db_1   | 2018-06-12  4:35:23 0 [Note] InnoDB: Using Linux native AIO
.....
.....
db_1   | 2018-06-12  5:34:24 0 [Note] mysqld: ready for connections.
db_1   | Version: '10.3.7-MariaDB-1:10.3.7+maria~jessie'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  mariadb.org binary distribution

# run any commands inside a container

# container name is just the one set in [docker-compose.yml]

root@dlp:~#
docker-compose exec db /bin/bash

root@ee9472495571:/#

# stop application and also shutdown all containers

root@dlp:~#
docker-compose stop

Stopping root_web_1 ... done
Stopping root_db_1  ... done

# start a service alone in application

# if set dependency, other container starts

root@dlp:~#
docker-compose up -d web

Starting root_web_1 ...
Starting root_web_1 ... done
root@dlp:~#
docker-compose ps

   Name                 Command               State          Ports
-------------------------------------------------------------------------
root_db_1    docker-entrypoint.sh mysqld      Exit 0
root_web_1   /usr/sbin/apachectl -D FOR ...   Up       0.0.0.0:80->80/tcp

# remove all containers in application

# if a container is running, it won't be removeds

root@dlp:~#
docker-compose rm

Going to remove root_web_1
Going to remove root_db_1
Are you sure? [yN] y
Removing root_db_1 ... done
Removing root_web_1 ... done
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