Docker : Use Docker Compose2019/05/10 |
Install Docker Compose to create or run multiple Containers easily.
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[1] | Install Docker Compose. |
[root@dlp ~]# dnf -y install docker-compose
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[2] | For example, create a config to create 2 containers, one has Apache httpd, one has MariaDB. |
FROM fedora MAINTAINER ServerWorld <admin@srv.world> RUN dnf -y upgrade RUN dnf -y install httpd EXPOSE 80 CMD ["/usr/sbin/httpd", "-D", "FOREGROUND"] version: '3' services: db: image: mariadb volumes: - /var/lib/docker/disk01:/var/lib/mysql environment: MYSQL_ROOT_PASSWORD: password MYSQL_USER: fedora MYSQL_PASSWORD: password MYSQL_DATABASE: fedora_db ports: - "3306:3306" web: build: . ports: - "80:80" volumes: - /var/lib/docker/disk02:/var/www/html # build and run application [root@dlp ~]# docker-compose up -d Creating network "root_default" with the default driver Pulling db (mariadb:)... Trying to pull repository docker.io/library/mariadb ... Digest: sha256:182b47379bf7c746ad990e48ef2496e2c84477bd3a74dcb164b4244bec934926 Status: Downloaded newer image for docker.io/mariadb:latest Building web Step 1/6 : FROM fedora ---> d09302f77cfc Step 2/6 : MAINTAINER ServerWorld <admin@srv.world> ---> Using cache ---> f59ff4ea81ea Step 3/6 : RUN dnf -y upgrade ---> Running in 00e8b044adac ..... ..... Creating root_web_1 ... done Creating root_db_1 ... done[root@dlp ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a6ced9967672 mariadb "docker-entrypoint..." 32 seconds ago Up 29 seconds 0.0.0.0:3306->3306/tcp root_db_1 ad280000e64c root_web "/usr/sbin/httpd -..." 32 seconds ago Up 29 seconds 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 | a6ced9967672 | +---------------+--------------+[root@dlp ~]# mysql -h 127.0.0.1 -u fedora -p -e "show databases;" Enter password: +--------------------+ | Database | +--------------------+ | fedora_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] | The follows are some other basic Operation for Docker Compose. |
# show status of application [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/httpd -D FOREGROUND Up 0.0.0.0:80->80/tcp # show logs of application [root@dlp ~]# docker-compose logs ..... ..... db_1 | 2019-05-10 7:35:00 0 [Note] mysqld: ready for connections. db_1 | Version: '10.3.14-MariaDB-1:10.3.14+maria~bionic' socket: '/var/run/mysqld/mysqld.sock' port: 3306 mariadb.org binary distribution # run commands inside a container # for container name, it's just the name set in [docker-compose.yml] [root@dlp ~]# docker-compose exec db /bin/bash root@31ff9de8ca96:/# # stop allications [root@dlp ~]# docker-compose stop Stopping root_web_1 ... done Stopping root_db_1 ... done # run an application particularly # if it has dependency, another container also runs [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/httpd -D FOREGROUND Up 0.0.0.0:80->80/tcp # remove applications # running container won't be removed [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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