Rootless docker, auto start problem.

Problem:
Cannot connect to the Docker daemon at unix:///run/user/1000/docker.sock. Is the docker daemon running?

Here's what I've done and wanting a solution:

1. Created a user 'docker' on my CentOS 7.9.
2. Ran the curl -fsSL https://get.docker.com/rootless | sh
3. Created /etc/systemd/system/docker-rootless.service as root with below contents:
   `[Unit]
   Description=Docker Rootless Startup
   After=network.target

[Service]
Type=simple
ExecStart=/usr/bin/su -c /home/docker/bin/dockerd-rootless.sh - docker
TimeoutStartSec=0

[Install]
WantedBy=default.target`

4. Ran systemctl daemon-reload
5. Last but not least, systemctl enable docker-rootless.service which created the symlink.
6. Reboot.

However, the dockerd-rootless.sh runs, gets a PID but when running docker ps it returns:
Cannot connect to the Docker daemon at unix:///docker.sock. Is the docker daemon running?

I've tried adding:
export DOCKER_HOST=unix:///run/user/1001/docker.sock export DOCKER_HOST=unix://$XDG_RUNTIME_DIR/docker.sock

to the .bashrc of the docker user.

Any help would be greatly appreciated.
Cheers.

Start by reviewing /etc/systemd/system/docker-rootless.service and the docker user's .bashrc, then reproduce the reboot and run the reported docker ps command. Check whether dockerd-rootless.sh is using the same runtime socket and environment as the client; done means the rootless daemon starts automatically and docker ps connects successfully.