Run Redis with Podman. As a Systemd service and as a Pod.

podman_comands.sh

# This is a simple example of how to run a basic service inside a container with Podman

# Podman
## Pull the Docker image
podman pull docker.io/redis

## Run the container as you would do with Docker
podman run -d --name redis_server -p 6379:6379 redis

# But Podman facilitate some extra ways:

# Systemd
## Generate the unit for Systemd and put it in the user config space
podman generate systemd redis_server -f redis-container.service 
mkdir -p ~/.config/systemd/user
cp redis-container.service ~/.config/systemd/user/redis-container.service

## Start the Redis container as an user's service. I don't need 'sudo'.
systemctl --user start redis-container.service 

## Check if Redis is running
systemctl --user status redis-container.service

## Check if I can access to Redis. I need nc (netcat) installed.
(printf "PING\r\n";) | nc localhost 6379
### It should respond: '+PONG'

## Stop the service
systemctl --user stop redis-container.service 

## NOTE: If you try to run this service as normal system service won't work,
## because the container was created by the user and only the user sees it.
## Podman has no daemon and no centraliced containers.
## My guess is that you should create a user for the service, create the container
## with that user and tell systemd to run it at its userspace.


# Pod
## Generate a pod definition in K8s format
podman generate kube redis_server -f redis_server.yml

## Make sure the container doesn't exist anymore
podman rm -f redis_server

## Run the new pod with the container with Redis inside.
podman play kube redis_server.yml

## Check if I can access to Redis. I need nc (netcat) installed.
(printf "PING\r\n";) | nc localhost 6379
### It should respond: '+PONG'


# NOTE: The other files are the ones generated with the previous commands.
# The 'redis-container.service' one won't be the same at your system, because the hash
# for the container will be different.

redis-container.service

# container-b6c3519d0335c5290e363698016f8d87b9ed868d6e3bd7ffbfa057b5accb9e7b.service
# autogenerated by Podman 1.9.3
# Wed Jun 10 00:53:55 WEST 2020

[Unit]
Description=Podman container-b6c3519d0335c5290e363698016f8d87b9ed868d6e3bd7ffbfa057b5accb9e7b.service
Documentation=man:podman-generate-systemd(1)
Wants=network.target
After=network-online.target

[Service]
Environment=PODMAN_SYSTEMD_UNIT=%n
Restart=on-failure
ExecStart=/usr/bin/podman start b6c3519d0335c5290e363698016f8d87b9ed868d6e3bd7ffbfa057b5accb9e7b
ExecStop=/usr/bin/podman stop -t 10 b6c3519d0335c5290e363698016f8d87b9ed868d6e3bd7ffbfa057b5accb9e7b
PIDFile=/run/user/1000/containers/overlay-containers/b6c3519d0335c5290e363698016f8d87b9ed868d6e3bd7ffbfa057b5accb9e7b/userdata/conmon.pid
KillMode=none
Type=forking

[Install]
WantedBy=multi-user.target default.target

redis_server.yml

# Generation of Kubernetes YAML is still under development!
#
# Save the output of this file and use kubectl create -f to import
# it into Kubernetes.
#
# Created with podman-1.9.3
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: "2020-06-10T14:22:20Z"
  labels:
    app: redisserver
  name: redisserver
spec:
  containers:
  - command:
    - redis-server
    env:
    - name: PATH
      value: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    - name: TERM
      value: xterm
    - name: HOSTNAME
    - name: container
      value: podman
    - name: REDIS_VERSION
      value: 6.0.4
    - name: REDIS_DOWNLOAD_URL
      value: http://download.redis.io/releases/redis-6.0.4.tar.gz
    - name: REDIS_DOWNLOAD_SHA
      value: 3337005a1e0c3aa293c87c313467ea8ac11984921fab08807998ba765c9943de
    - name: GOSU_VERSION
      value: "1.12"
    image: docker.io/library/redis:latest
    name: redisserver
    ports:
    - containerPort: 6379
      hostPort: 6379
      protocol: TCP
    resources: {}
    securityContext:
      allowPrivilegeEscalation: true
      capabilities: {}
      privileged: false
      readOnlyRootFilesystem: false
      seLinuxOptions: {}
    workingDir: /data
status: {}