Podman¶

install¶

yum install podman
yum install podman-compose

create pod¶

sudo podman pod create --name=app-example -p 8099:80

add container to pod¶

e.g. wordpress

sudo mkdir /opt/podman.pod
sudo mkdir /opt/podman.pod/app-example
sudo mkdir /opt/podman.pod/app-example/c_db
sudo mkdir /opt/podman.pod/app-example/c_db/var
sudo mkdir /opt/podman.pod/app-example/c_db/var/lib
sudo mkdir /opt/podman.pod/app-example/c_db/var/lib/mysql
sudo mkdir /opt/podman.pod/app-example/c_wp
sudo mkdir /opt/podman.pod/app-example/c_wp/var
sudo mkdir /opt/podman.pod/app-example/c_wp/var/www
sudo mkdir /opt/podman.pod/app-example/c_wp/var/www/html

sudo podman run -d --restart=always --pod=app-example -e MYSQL_ROOT_PASSWORD="root" -e MYSQL_DATABASE="wordpress" -e MYSQL_USER="wpuser" -e MYSQL_PASSWORD="password" -v /etc/localtime:/etc/localtime:ro -v /opt/podman.pod/app-example/c_db/var/lib/mysql:/var/lib/mysql:Z --name=app-example-db mariadb
sudo podman run -d --restart=always --pod=app-example -e WORDPRESS_DB_NAME="wordpress" -e WORDPRESS_DB_USER="wpuser" -e WORDPRESS_DB_PASSWORD="password" -e WORDPRESS_DB_HOST="127.0.0.1" -v /etc/localtime:/etc/localtime:ro -v /opt/podman.pod/app-example/c_wp/var/www/html:/var/www/html:Z --name app-example-wp wordpress

create systemd-unit files¶

cd /opt/podman.pod/app-example
sudo podman generate systemd --files --name app-example
sudo cp pod-*.service /etc/systemd/system/.
sudo cp container-*.service /etc/systemd/system/.

create container¶

see also:
https://www.redhat.com/sysadmin/wordpress-container
https://rancher.com/learning-paths/how-to-build-and-run-your-own-container-images/
https://docs.podman.io/en/latest/markdown/podman-build.1.html

create ~/container.user/wordpress.user/Dockerfile

FROM docker.io/rockylinux/rockylinux
MAINTAINER jke <j@keihsler.com>
RUN dnf module enable -y php:7.4
RUN yum install -y mariadb-server mariadb php php-apcu php-intl php-mbstring php-xml php-json php-mysqlnd crontabs cronie iputils net-tools;yum clean all
RUN systemctl enable mariadb
RUN systemctl enable httpd
RUN systemctl disable systemd-update-utmp.service
ENTRYPOINT ["/sbin/init"]
CMD ["/sbin/init"]

cd ~/container.user/wordpress.user/
podman build -t wordpress_user .

compose pod¶

create ~/compose.user/nextcloud.user/compose.yml

version: '3'

services:

  db:
    image: mariadb
    container_name: nextcloud-mariadb
    networks:
      - nextcloud_network
    volumes:
      - db:/opt/nextcloud/mysql
      - /etc/localtime:/etc/localtime:ro
    environment:
      - MYSQL_ROOT_PASSWORD=XXXXX
      - MYSQL_PASSWORD=XXXXX
      - MYSQL_DATABASE=nextcloud
      - MYSQL_USER=nextcloud
    restart: unless-stopped

  app:
    image: nextcloud:latest
    container_name: nextcloud-app
    ports:
      - 9099:80
    networks:
      - nextcloud_network
    depends_on:
      - db
    volumes:
      - nextcloud:/var/www/html
      - ./app/config:/var/www/html/config
      - ./app/custom_apps:/var/www/html/custom_apps
      - ./app/data:/var/www/html/data
      - ./app/themes:/opt/nextcloud/www/html/themes
      - /etc/localtime:/etc/localtime:ro
    environment:
      - VIRTUAL_HOST=ak-i40-cloud.openfab.org
    restart: unless-stopped

volumes:
  nextcloud:
  db:

networks:
  nextcloud_network:

podman-compose -f ~/compose.user/nextcloud.user/compose.yml up

shell-access to inside container¶

podman exec -it -u root nc_example.com-nc /bin/sh

administration¶

list (dangling) images¶

podman images
podman images -f dangling=true

remove dangling images¶

best is to make sure that all containers needed are up and running before removing dangling containers

podman system prune

debuging¶

get the location of the logfile of a specific container¶

podman inspect  --format='{{.HostConfig.LogConfig.Path}}'  <container-id>