Podman : Use Docker Compose2023/11/16 |
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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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| [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
user: 0:0
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 Creating network "root_default" with the default driver Pulling db (docker.io/library/mariadb:)... Building web Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg. STEP 1/5: FROM fedora ..... ..... Creating root_db_1 ... done Creating root_web_1 ... done[root@dlp ~]# podman ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 96ff32a146fb localhost/root_web:latest /usr/sbin/nginx -... 6 seconds ago Up 6 seconds 0.0.0.0:80->80/tcp root_web_1 fae2469cbd96 docker.io/library/mariadb:latest mariadbd 6 seconds ago Up 6 seconds 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 | fae2469cbd96 | +---------------+--------------+[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 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_web_1, root_db_1 db_1 | 2023-11-16 00:56:38+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.1.2+maria~ubu2204 started. db_1 | 2023-11-16 00:56:38+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' db_1 | 2023-11-16 00:56:38+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.1.2+maria~ubu2204 started. db_1 | 2023-11-16 00:56:38+00:00 [Note] [Entrypoint]: Initializing database files db_1 | 2023-11-16 0:56:38 0 [Warning] mariadbd: io_uring_queue_init() failed with ENOSYS: check seccomp filters, and the kernel version (newer than 5.1 required) db_1 | 2023-11-16 0:56:38 0 [Warning] InnoDB: liburing disabled: falling back to innodb_use_native_aio=OFF ..... ..... db_1 | 2023-11-16 0:56:43 0 [Note] mariadbd: Event Scheduler: Loaded 0 events db_1 | 2023-11-16 0:56:43 0 [Note] mariadbd: ready for connections. db_1 | Version: '11.1.2-MariaDB-1:11.1.2+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@fae2469cbd96:/# # 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 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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