Podman : Use Docker Compose2023/06/21

	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.
[1]	Install Podman-docker, refer to here.
[2]	Install Docker Compose.

root@dlp:~#

apt -y install docker-compose

root@dlp:~#

docker-compose --version

docker-compose version 1.29.2, build unknown

[3]	For example, Configure an application that has Web and DB services with Docker Compose.

# start podman.socket

root@dlp:~#

systemctl start podman.socket

# define Web service container

root@dlp:~#

vi Dockerfile

FROM debian
MAINTAINER ServerWorld <admin@srv.world>

RUN apt-get update
RUN apt-get -y install nginx
RUN echo "Compose Test on Nginx" > /var/www/html/index.html

EXPOSE 80
CMD ["/usr/sbin/nginx", "-g", "daemon off;"]

# define application configuration

root@dlp:~#

vi docker-compose.yml

version: '3'
services:
  db:
    image: docker.io/library/mariadb
    volumes:
      - /var/lib/containers/disk01:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_USER: debian
      MYSQL_PASSWORD: password
      MYSQL_DATABASE: debian_db
    ports:
      - "3306:3306"
  web:
    build: .
    ports:
      - "80:80"
    volumes:
      - /var/lib/containers/disk02:/usr/share/nginx/html

# build and run

root@dlp:~#

docker-compose up -d

Building web
Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg.
STEP 1/7: FROM debian
STEP 2/7: MAINTAINER ServerWorld <admin@srv.world>
--> Using cache 00970b06f91f398d68bd80a879f505cde9bf7b0326fee60bda2ee0663008fdff
--> 00970b06f91
STEP 3/7: RUN apt-get update
.....
.....
Creating root_db_1  ... done
Creating root_web_1 ... done

root@dlp:~#

podman ps

CONTAINER ID  IMAGE                             COMMAND               CREATED         STATUS             PORTS                   NAMES
7925b61be272  localhost/root_web:latest         /usr/sbin/nginx -...  55 seconds ago  Up 55 seconds ago  0.0.0.0:80->80/tcp      root_web_1
7230fd252ef6  docker.io/library/mariadb:latest  mariadbd              55 seconds ago  Up 55 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      | 7230fd252ef6 |
+---------------+--------------+

root@dlp:~#

mysql -h 127.0.0.1 -u debian -p -e "show databases;"

Enter password:
+--------------------+
| Database           |
+--------------------+
| debian_db          |
| information_schema |
+--------------------+

root@dlp:~#

curl 127.0.0.1

Compose Test on Nginx

[4]	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 mariadbd    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   | 2023-06-21 00:27:26+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.0.2+maria~ubu2204 started.
db_1   | 2023-06-21 00:27:26+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
db_1   | 2023-06-21 00:27:26+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.0.2+maria~ubu2204 started.
db_1   | 2023-06-21 00:27:26+00:00 [Note] [Entrypoint]: Initializing database files
.....
.....
db_1   | 2023-06-21  0:27:31 0 [Note] Server socket created on IP: '::'.
db_1   | 2023-06-21  0:27:31 0 [Note] mariadbd: ready for connections.
db_1   | Version: '11.0.2-MariaDB-1:11.0.2+maria~ubu2204'  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@7230fd252ef6:/#

# 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 ... done

root@dlp:~#

docker-compose ps

   Name                 Command               State         Ports
----------------------------------------------------------------------
root_db_1    docker-entrypoint.sh mariadbd    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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