snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

docs/development/setup/install-docker.md

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+##### 2. Create the `docker` group and add yourself to it:
+
+```console
+$ sudo groupadd docker
+$ sudo usermod -aG docker $USER
+```
+
+You will need to log out and log back in (or reboot) for this change to take effect.
+If it worked, you will see `docker` in your list of groups:
+
+```console
+$ groups | grep docker
+YOURUSERNAME adm cdrom sudo dip plugdev lpadmin sambashare docker
+```
+
+##### 3. Make sure the Docker daemon is running
+
+Docker runs as a background service (daemon), which must be running for Docker commands to work.
+You can check using the following:
+
+```console
+$ systemctl status docker
+● docker.service - Docker Application Container Engine
+   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
+   Active: active (running) since Mon 2019-07-15 23:20:46 IST; 18min ago
+```
+
+If the service is not running, you'll see `Active: inactive (dead)` on
+the second line, and will need to enable and start the Docker service
+using the following:
+
+```console
+$ sudo systemctl unmask docker
+$ sudo systemctl enable docker
+$ sudo systemctl start docker
+```