Podman : Use Docker Compose2021/05/14 |
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To Install Docker Compose, it's easy to configure and run multiple containers as a Docker application.
Docker Compose is supported on Podman 3.0 or later. |
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| [1] | |
| [2] | Install Docker Compose. |
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[root@dlp ~]# dnf -y install docker-compose
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| [3] | For example, Configure an application that has Web and DB services with Docker Compose. |
FROM fedora MAINTAINER ServerWorld <admin@srv.world> RUN dnf -y install nginx EXPOSE 80 CMD ["/usr/sbin/nginx", "-g", "daemon off;"]
version: '3'
services:
db:
image: docker.io/library/mariadb
volumes:
- /var/lib/containers/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/containers/disk02:/usr/share/nginx/html
# buid and run [root@dlp ~]# docker-compose up -d Building web Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg. STEP 1: FROM fedora STEP 2: MAINTAINER ServerWorld <admin@srv.world> --> ba5ee8f2c01 STEP 3: RUN dnf -y install nginx ..... ..... Creating root_db_1 ... done Creating root_web_1 ... done[root@dlp ~]# podman ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e5046ae1a40f localhost/root_web:latest /usr/sbin/nginx -... 20 seconds ago Up 20 seconds ago 0.0.0.0:80->80/tcp root_web_1 3ce5a99dc421 docker.io/library/mariadb:latest mysqld 20 seconds ago Up 20 seconds ago 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 | 3ce5a99dc421 | +---------------+--------------+[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/containers/disk02/index.html [root@dlp ~]# curl 127.0.0.1 Hello Docker Compose World |
| [4] | 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 :3306->3306/tcp root_web_1 /usr/sbin/nginx -g daemon off; Up :80->80/tcp # show logs of containers [root@dlp ~]# docker-compose logs Attaching to root_db_1, root_web_1 db_1 | 2021-05-13 06:12:23+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 1:10.5.9+maria~focal started. db_1 | 2021-05-13 06:12:23+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' db_1 | 2021-05-13 06:12:23+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 1:10.5.9+maria~focal started. db_1 | 2021-05-13 06:12:23+00:00 [Note] [Entrypoint]: Initializing database files ..... ..... db_1 | 2021-05-13 6:12:30 0 [Note] Added new Master_info '' to hash table db_1 | 2021-05-13 6:12:30 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 Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg. root@3ce5a99dc421:/# # stop application and also shutdown all containers [root@dlp ~]# docker-compose stop Stopping root_db_1 ... Stopping root_web_1 ... 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 :3306->3306/tcp root_web_1 /usr/sbin/nginx -g daemon off; Up :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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