Docker : Use Docker Compose2021/08/30 |
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. |
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 debian 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: bullseye MYSQL_PASSWORD: password MYSQL_DATABASE: bullseye_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 Creating network "root_default" with the default driver Building web Step 1/7 : FROM debian ---> fe3c5de03486 Step 2/7 : MAINTAINER ServerWorld <admin@srv.world> ---> Using cache ---> 7327e34c8977 Step 3/7 : ENV DEBIAN_FRONTEND=noninteractive ---> Running in 2d9696af1448 ..... ..... Creating root_db_1 ... done Creating root_web_1 ... doneroot@dlp:~# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d3077533ab0e root_web "/usr/sbin/apachectl…" About a minute ago Up About a minute 0.0.0.0:80->80/tcp root_web_1 9aa6dc83c5de mariadb "docker-entrypoint.s…" About a minute ago Up About a minute 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 | 9aa6dc83c5de | +---------------+--------------+root@dlp:~# mysql -h 127.0.0.1 -u bullseye -p -e "show databases;" Enter password: +--------------------+ | Database | +--------------------+ | bullseye_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 Attaching to root_web_1, root_db_1 db_1 | 2021-08-30 01:02:52+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:10.6.4+maria~focal started. db_1 | 2021-08-30 01:02:52+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' db_1 | 2021-08-30 01:02:52+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:10.6.4+maria~focal started. ..... ..... db_1 | 2021-08-30 1:03:02 0 [Warning] 'proxies_priv' entry '@% root@9aa6dc83c5de' ignored in --skip-name-resolve mode. db_1 | 2021-08-30 1:03:02 0 [Note] mysqld: ready for connections. db_1 | Version: '10.6.4-MariaDB-1:10.6.4+maria~focal' socket: '/run/mysqld/mysqld.sock' port: 3306 mariadb.org binary distribution web_1 | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.18.0.2. Set the 'ServerName' directive globally to suppress this message # 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@9aa6dc83c5de:/# # 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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