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Docker : Use Docker Compose
2020/06/02 |
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To Install Docker Compose, it's easy to configure and run multiple containers as a Docker application.
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| [1] | Install Docker Compose. |
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root@dlp:~# apt -y install docker-compose
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| [2] | For example, Configure an application that has Web and DB services with Docker Compose. |
FROM ubuntu MAINTAINER ServerWorld <admin@srv.world> ENV DEBIAN_FRONTEND=noninteractive RUN apt-get update RUN apt-get -y install apache2 EXPOSE 80 CMD ["/usr/sbin/apachectl", "-D", "FOREGROUND"]
version: '3'
services:
db:
image: mariadb
volumes:
- /var/lib/docker/disk01:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: password
MYSQL_USER: hirsute
MYSQL_PASSWORD: password
MYSQL_DATABASE: hirsute_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 1/7 : FROM ubuntu ---> 7e0aa2d69a15 Step 2/7 : MAINTAINER ServerWorld <admin@srv.world> ---> Using cache ---> a2fa80a6247c Step 3/7 : ENV DEBIAN_FRONTEND=noninteractive ---> Running in cc43f41aa43d ..... ..... Creating root_web_1 ... done Creating root_db_1 ... doneroot@dlp:~# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 7b0535cfaf92 mariadb "docker-entrypoint.s…" About a minute ago Up About a minute 0.0.0.0:3306->3306/tcp root_db_1 73aa26c9ecd3 root_web "/usr/sbin/apachectl…" About a minute ago Up About a minute 0.0.0.0:80->80/tcp root_web_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 | 7b0535cfaf92 | +---------------+--------------+root@dlp:~# mysql -h 127.0.0.1 -u hirsute -p -e "show databases;" Enter password: +--------------------+ | Database | +--------------------+ | hirsute_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. |
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# 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 Attaching to root_db_1, root_web_1 db_1 | 2021-05-12 05:49:07+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 1:10.5.9+maria~focal started. db_1 | 2021-05-12 05:49:07+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' db_1 | 2021-05-12 05:49:07+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 1:10.5.9+maria~focal started. db_1 | 2021-05-12 05:49:08+00:00 [Note] [Entrypoint]: Initializing database files ..... ..... db_1 | 2021-05-12 5:49:15 0 [Note] Added new Master_info '' to hash table db_1 | 2021-05-12 5:49:15 0 [Note] mysqld: ready for connections. db_1 | Version: '10.5.9-MariaDB-1:10.5.9+maria~focal' socket: '/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@7b0535cfaf92:/# # stop application and also shutdown all containers root@dlp:~# docker-compose stop Stopping root_db_1 ... done Stopping root_web_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 ... doneroot@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 removed root@dlp:~# docker-compose rm
Going to remove root_db_1
Are you sure? [yN] y
Removing root_db_1 ... done
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