Podman : Use Docker Compose2025/01/21

	To Install Docker Compose, it's easy to configure and run multiple containers as a Docker application.
[1]	Install Podman-docker, refer to here.
[2]	Install Docker Compose.

[root@dlp ~]#

curl -L https://github.com/docker/compose/releases/download/v2.32.4/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose

[root@dlp ~]#

chmod 755 /usr/local/bin/docker-compose

[root@dlp ~]#

docker-compose --version

Docker Compose version v2.32.4

[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 quay.io/centos/centos:stream10
LABEL Maintainer "ServerWorld <admin@srv.world>"

RUN dnf -y install nginx

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

# define application configuration

[root@dlp ~]#

vi docker-compose.yml

services:
  db:
    image: docker.io/library/mariadb
    volumes:
      - /var/lib/containers/disk01:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_USER: cent
      MYSQL_PASSWORD: password
      MYSQL_DATABASE: cent_db
    user: 0:0
    privileged: true
    ports:
      - "3306:3306"
  web:
    build: .
    ports:
      - "80:80"
    volumes:
      - /var/lib/containers/disk02:/usr/share/nginx/html
    privileged: true

# build and run

[root@dlp ~]#

docker-compose up -d

[+] Building 1.7s (8/8) FINISHED   docker-container:default

.....
.....

[+] Running 3/3veth2: entered allmulticast mode
 ✓ web                   Built
 ✓ Container root-db-1   Started
 ✓ Container root-web-1  Started

[root@dlp ~]#

podman ps

CONTAINER ID  IMAGE                                    COMMAND               CREATED             STATUS             PORTS                   NAMES
7c8a1f172184  docker.io/moby/buildkit:buildx-stable-1                        11 minutes ago      Up 11 minutes                              buildx_buildkit_default
ab2e8be97696  docker.io/library/root-web:latest        /usr/sbin/nginx -...  About a minute ago  Up About a minute  0.0.0.0:80->80/tcp      root-web-1
6ff448bfc445  docker.io/library/mariadb:latest         mariadbd              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      | 6ff448bfc445 |
+---------------+--------------+

[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/containers/disk02/index.html

[root@dlp ~]#

curl 127.0.0.1

Hello Docker Compose World

[4]	Other basic operations of Docker Compose are follows.

# verify state of containers

[root@dlp ~]#

docker-compose ps

NAME         IMAGE                               COMMAND                  SERVICE   CREATED         STATUS         PORTS
root-db-1    docker.io/library/mariadb:latest    "mariadbd"               db        4 minutes ago   Up 4 minutes   3306/tcp
root-web-1   docker.io/library/root-web:latest   "/usr/sbin/nginx -g …"   web       4 minutes ago   Up 4 minutes   80/tcp

# show logs of containers

[root@dlp ~]#

docker-compose logs

db-1  | 2025-01-21 07:28:12+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.6.2+maria~ubu2404 started.
db-1  | 2025-01-21 07:28:12+00:00 [Warn] [Entrypoint]: /sys/fs/cgroup///memory.pressure not writable, functionality unavailable to MariaDB
db-1  | 2025-01-21 07:28:12+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
db-1  | 2025-01-21 07:28:12+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.6.2+maria~ubu2404 started.
db-1  | 2025-01-21 07:28:13+00:00 [Note] [Entrypoint]: MariaDB upgrade not required
db-1  | 2025-01-21  7:28:13 0 [Note] Starting MariaDB 11.6.2-MariaDB-ubu2404 source revision d8dad8c3b54cd09fefce7bc3b9749f427eed9709 server_uid 60CBFwXHGr/2pUSMnsHtTvEIbr0= as process 1
.....
.....

# 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@6ff448bfc445:/# exit
exit

# stop application and also shutdown all containers

[root@dlp ~]#

docker-compose stop

[+] Stopping 1/2
 ✓ Container root-web-1  Stopped
    Container root-db-1   Stopping
[+] Stopping 2/2eth1 (unregistering): left allmulticast mode
 ✓ Container root-web-1  Stopped
 ✓ Container root-db-1   Stopped

# start a service alone in application
# if set dependency, other container starts

[root@dlp ~]#

docker-compose up -d web

[+] Running 0/1
    Container root-web-1  Recreate
[+] Running 1/1podman1: port 1(veth1) entered blocking state
 ✓ Container root-web-1  Started

[root@dlp ~]#

docker-compose ps

NAME         IMAGE                               COMMAND                  SERVICE   CREATED          STATUS          PORTS
root-web-1   docker.io/library/root-web:latest   "/usr/sbin/nginx -g …"   web       40 seconds ago   Up 39 seconds   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 y
[+] Removing 1/1
 ✓ Container root-db-1  Removed

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