engine/install: enable engine as system service on rpm installs

content/manuals/engine/install/centos.md

@@ -142,12 +142,18 @@ $ sudo yum-config-manager --add-repo {{% param "download-url-base" %}}/docker-ce
    {{< /tab >}}
    {{< /tabs >}}
 
-2. Start Docker.
+2. Start Docker Engine.
+
+   Start the Docker Engine and containerd as a systemd service that will launch
+   on boot:
 
    ```console
-   $ sudo systemctl start docker
+   $ sudo systemctl enable --now containerd docker
    ```
 
+   If you prefer Docker to only start manually, use `sudo systemctl start docker`
+   instead, which runs it only for the current session.
+
 3. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.
 
@@ -188,12 +194,18 @@ download a new file each time you want to upgrade Docker Engine.
    Docker is installed but not started. The `docker` group is created, but no
    users are added to the group.
 
-3. Start Docker.
+3. Start Docker Engine.
+
+   Start the Docker Engine and containerd as a systemd service that will launch
+   on boot:
 
    ```console
-   $ sudo systemctl start docker
+   $ sudo systemctl enable --now containerd docker
    ```
 
+   If you prefer Docker to only start manually, use `sudo systemctl start docker`
+   instead, which runs it only for the current session.
+
 4. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.
 

content/manuals/engine/install/fedora.md

@@ -139,12 +139,18 @@ $ sudo dnf-3 config-manager --add-repo {{% param "download-url-base" %}}/docker-
    {{< /tab >}}
    {{< /tabs >}}
 
-2. Start Docker.
+2. Start Docker Engine.
+
+   Start the Docker Engine and containerd as a systemd service that will launch
+   on boot:
 
    ```console
-   $ sudo systemctl start docker
+   $ sudo systemctl enable --now containerd docker
    ```
 
+   If you prefer Docker to only start manually, use `sudo systemctl start docker`
+   instead, which runs it only for the current session.
+
 3. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.
 
@@ -185,19 +191,19 @@ download a new file each time you want to upgrade Docker Engine.
    Docker is installed but not started. The `docker` group is created, but no
    users are added to the group.
 
-3. Start Docker.
-
-   ```console
-   $ sudo systemctl start docker
-   ```
+3. Start Docker Engine.
 
-4. Make Docker start automatically after reboot.
+   Start the Docker Engine and containerd as a systemd service that will launch
+   on boot:
 
    ```console
-   $ sudo systemctl enable docker
+   $ sudo systemctl enable --now containerd docker
    ```
 
-5. Verify that the Docker Engine installation is successful by running the
+   If you prefer Docker to only start manually, use `sudo systemctl start docker`
+   instead, which runs it only for the current session.
+
+4. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.
 
    ```console

content/manuals/engine/install/rhel.md

@@ -143,12 +143,18 @@ $ sudo yum-config-manager --add-repo {{% param "download-url-base" %}}/docker-ce
    {{< /tab >}}
    {{< /tabs >}}
 
-2. Start Docker.
+2. Start Docker Engine.
+
+   Start the Docker Engine and containerd as a systemd service that will launch
+   on boot:
 
    ```console
-   $ sudo systemctl start docker
+   $ sudo systemctl enable --now containerd docker
    ```
 
+   If you prefer Docker to only start manually, use `sudo systemctl start docker`
+   instead, which runs it only for the current session.
+
 3. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.
 
@@ -205,12 +211,18 @@ download a new file each time you want to upgrade Docker Engine.
    Docker is installed but not started. The `docker` group is created, but no
    users are added to the group.
 
-6. Start Docker.
+6. Start Docker Engine.
+
+   Start the Docker Engine and containerd as a systemd service that will launch
+   on boot:
 
    ```console
-   $ sudo systemctl start docker
+   $ sudo systemctl enable --now containerd docker
    ```
 
+   If you prefer Docker to only start manually, use `sudo systemctl start docker`
+   instead, which runs it only for the current session.
+
 7. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.
 

content/manuals/engine/install/sles.md

@@ -162,12 +162,18 @@ $ sudo zypper addrepo {{% param "download-url-base" %}}/docker-ce.repo
    {{< /tab >}}
    {{< /tabs >}}
 
-2. Start Docker.
+2. Start Docker Engine.
+
+   Start the Docker Engine and containerd as a systemd service that will launch
+   on boot:
 
    ```console
-   $ sudo systemctl start docker
+   $ sudo systemctl enable --now containerd docker
    ```
 
+   If you prefer Docker to only start manually, use `sudo systemctl start docker`
+   instead, which runs it only for the current session.
+
 3. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.
 
@@ -208,12 +214,18 @@ download a new file each time you want to upgrade Docker Engine.
    Docker is installed but not started. The `docker` group is created, but no
    users are added to the group.
 
-3. Start Docker.
+3. Start Docker Engine.
+
+   Start the Docker Engine and containerd as a systemd service that will launch
+   on boot:
 
    ```console
-   $ sudo systemctl start docker
+   $ sudo systemctl enable --now containerd docker
    ```
 
+   If you prefer Docker to only start manually, use `sudo systemctl start docker`
+   instead, which runs it only for the current session.
+
 4. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.