Deploying sample applications in containers¶

Use the quadlet_radio_engine.aib.yml manifest to build a virtual machine OS image that includes containerized sample applications.

The sample applications include two SOME/IP services:

radio-service, which simulates a radio
engine-service that simulates other parts of the car.

There is also a command line application radio-client, which talks to the services displaying the current status and allowing you to control the radio. For more information, see the sample-apps README.

The image uses the COVESA vsomeip implementation of SOME/IP as packaged in Fedora, and rebuilt in COPR. In particular, the image starts the vsomeip routing manager (non-contained), using systemd socket activation with a custom SELinux policy that controls access.

After you boot the OS image, two container-based systemd sample services are running: radio.service and engine.service.

Prerequisites

You have installed the Automotive image builder utility by following the instructions in
Installing Automotive Image Builder.
You have installed QEMU by following the instructions in the QEMU documentation.

Procedure

Create and go to a new directory called sample-auto-apps:
```
$ mkdir sample-auto-apps && cd sample-auto-apps
```

Create and save a file called radio.container that contains the following code:

[Unit]
Description=Demo radio service container
Requires=routingmanagerd.socket
After=routingmanagerd.socket
Wants=engine.service

[Container]
Image=localhost/auto-apps
Exec=/usr/bin/radio-service
Volume=/run/vsomeip:/run/vsomeip

[Service]
Restart=always

[Install]
WantedBy=multi-user.target

Create and save a file called engine.container that contains the following code:

[Unit]
Description=Demo engine service container
Requires=routingmanagerd.socket
After=routingmanagerd.socket

[Container]
Image=localhost/auto-apps
Exec=/usr/bin/engine-service
Volume=/run/vsomeip:/run/vsomeip

[Service]
Restart=always

[Install]
WantedBy=multi-user.target

Create and go to a new subdirectory called quadlet_radio_engine:
```
$ mkdir quadlet_radio_engine && cd quadlet_radio_engine
```

Create and save a build manifest file named quadlet_radio_engine.aib.yml, that contains the following YAML code:

name: quadlet_radio_engine

content:
  repos:
    - id: copr-sample-apps
      baseurl: https://download.copr.fedorainfracloud.org/results/alexl/cs9-sample-images/centos-stream-9-$arch/
  rpms:
    - podman
    - containernetworking-plugins
    - vsomeip3-routingmanager
    - dlt-daemon
    # For testing the image only:
    - openssh-server
    - openssh-clients

  container_images:
    # Get the auto-apps container image from gitlab
    - source: registry.gitlab.com/centos/automotive/sample-images/demo/auto-apps
      tag: latest
      name: localhost/auto-apps

  add_files:
    - path: /etc/containers/systemd/radio.container
      source_path: ../radio.container
    - path: /etc/containers/systemd/engine.container
      source_path: ../engine.container

  # Required for testing the image only:
  systemd:
    enabled_services:
      # Enable ssh daemon
      - sshd.service
      # Enable the dlt daemon
      - dlt

auth:
  # "password"
  root_password: $6$xoLqEUz0cGGJRx01$H3H/bFm0myJPULNMtbSsOFd/2BnHqHkMD92Sfxd.EKM9hXTWSmELG8cf205l6dktomuTcgKGGtGDgtvHVXSWU.
  # Required for testing the image only:
  sshd_config:
    PasswordAuthentication: true
    PermitRootLogin: true

Export the current system’s CPU architecture as a variable:
```
$ arch=$(arch)
```

Run the following command to build the OS image:

   automotive-image-builder --verbose \
    --include=.. \
    build \
    --distro autosd9 \
    --target qemu \
    --mode image \
    --build-dir=_build \
    --export image \
    quadlet_radio_engine.aib.yml \
    quadlet_radio_engine.$arch.img

Boot the OS image as a virtual machine (VM) in QEMU:

$ sudo automotive-image-runner --nographics quadlet_radio_engine.x86_64.img

Log in to the VM as the root user with the password password.
Verify that the auto-apps container exists:
```
# podman image list
```
Verify that the radio service is running:
```
# systemctl status radio.service
```
Verify that the engine service is running:
```
# systemctl status engine.service
```
When you are done, run the following command to shut down the VM and return to your local terminal:
```
# poweroff
```