Docker : Use Docker Compose2020/12/14 |
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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 ~]#
curl -L https://github.com/docker/compose/releases/download/1.27.4/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
[root@dlp ~]#
[root@dlp ~]# chmod 755 /usr/local/bin/docker-compose
docker-compose --version docker-compose version 1.27.4, build 40524192 |
| [2] | For example, Configure an application that has Web and DB services with Docker Compose. |
FROM centos MAINTAINER ServerWorld <admin@srv.world> RUN dnf -y install nginx EXPOSE 80 CMD ["/usr/sbin/nginx", "-g", "daemon off;"]
version: '3'
services:
db:
image: mariadb
volumes:
- /var/lib/docker/disk01:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: password
MYSQL_USER: cent
MYSQL_PASSWORD: password
MYSQL_DATABASE: cent_db
ports:
- "3306:3306"
web:
build: .
ports:
- "80:80"
volumes:
- /var/lib/docker/disk02:/usr/share/nginx/html
# buid and run [root@dlp ~]# docker-compose up -d Building web Step 1/6 : FROM centos ---> 300e315adb2f Step 2/6 : MAINTAINER ServerWorld <admin@srv.world> ---> Using cache ---> bcfcafa6508d Step 3/6 : RUN dnf -y install nginx ---> Running in bd158e3bbf20 ..... ..... Creating root_db_1 ... done[root@dlp ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 11febb3c1f22 mariadb "docker-entrypoint.s…" About a minute ago Up About a minute 0.0.0.0:3306->3306/tcp root_db_1 30eca7b8065b root_web "/usr/sbin/nginx -g …" 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 | 11febb3c1f22 | +---------------+--------------+[root@dlp ~]# mysql -h 127.0.0.1 -u cent -p -e "show databases;" Enter password: +--------------------+ | Database | +--------------------+ | cent_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/nginx -g daemon off; 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 | 2020-12-11 02:51:30+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 1:10.5.8+maria~focal started. db_1 | 2020-12-11 02:51:30+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' ..... ..... db_1 | 2020-12-11 2:51:38 0 [Note] Added new Master_info '' to hash table db_1 | 2020-12-11 2:51:38 0 [Note] mysqld: ready for connections. db_1 | Version: '10.5.8-MariaDB-1:10.5.8+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@11febb3c1f22:/# # 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 ... done[root@dlp ~]# docker-compose ps Name Command State Ports ------------------------------------------------------------------------- root_db_1 docker-entrypoint.sh mysqld Exit 0 root_web_1 /usr/sbin/nginx -g daemon off; 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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