Getting Started

Setting up a local instance

This guide should provide all the basic information to set up a local development system with an API instance and a minimal pipeline.

A docker-compose environment is provided for both the new API and the pipeline. On Debian systems, the main prerequisite is to install it:

sudo apt install docker-compose

All the dependencies for running the API services as well as the pipeline clients are then handled using Docker images.

Setting up an API instance

This section covers how to set up a local API instance using the default self-contained configuration. It doesn’t rely on any external services.

Create the environment file

The first step is to populate the docker-compose environment file. It contains some settings specific to the local instance.

The API authentication mechanism requires a secret key used internally with encryption algorithms. To generate one for your local instance:

$ echo SECRET_KEY=$(openssl rand -hex 32) >> .env

This SECRET_KEY environment variable is currently the only required one.

Start docker-compose

To build the Docker images and start docker-compose:

$ docker-compose up --build
[...]
kernelci-api | INFO:     Application startup complete.

It can take a few minutes to build the images from scratch the first time. Then the services should be up and running. To confirm the API is available:

$ curl http://localhost:8001/
{"message":"KernelCI API"}

Port numbers for the services exposed by docker-compose can be configured using environment variables in the .env file: API_HOST_PORT, STORAGE_HOST_PORT, SSH_HOST_PORT. See docker-compose.yaml.

Following the curl command from the example above, the container log should show:

kernelci-api | INFO:     172.20.0.1:49228 - "GET / HTTP/1.1" 200 OK

Create an admin user account

Some parts of the API don’t require any authentication, like in the example above with the root / endpoint and most GET requests to retrieve data. However, sending data with POST and PUT requests can typically only be done by authenticated users. This will be required to run a full pipeline or to subscribe to the pub/sub interface. Then some users have administrator rights, which enables them to create new user accounts using the kci_data command line tool.

So let’s start by creating the initial admin user account. This can be done with the create_admin_user tool provided in the kernelci-api repository. Call it with the name of the admin user you want to create such as admin, then enter the admin password when prompted:

$ ./create_admin_user admin
Password: 
MongoDB shell version v5.0.12
connecting to: mongodb://127.0.0.1:27017/kernelci?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("789ad3c5-0caa-45a9-a514-efeec763dfeb") }
MongoDB server version: 5.0.12
WriteResult({ "nInserted" : 1 })

Note For more details about how to create users via the raw API, see the API documentation

Create an admin API token

Then to get an API token, the /token API endpoint can be used. For example, to create an admin token with the same user name and password as used previously:

$ curl -X 'POST' \
  'http://localhost:8001/token' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/x-www-form-urlencoded' \
  -d 'grant_type=&username=admin&password=hello&scope=admin users'
{"access_token":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJib2IifQ.KHkILtsJaCmueOfFCj79HGr6kHamuZFdB1Yz_5GqcC4","token_type":"bearer"}

Note This token was created with “admin users” scope so it can be used to create additional user accounts. For more details about API tokens, see the API documentation

The token can now be used with API entry points that require authentication. For example, to check it’s working:

$ curl -X 'GET' \
  'http://localhost:8001/me' \
  -H 'accept: application/json' \
  -H 'Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJib2IifQ.KHkILtsJaCmueOfFCj79HGr6kHamuZFdB1Yz_5GqcC4'
{"_id":"615f30020eb7c3c6616e5ac3","username":"bob","hashed_password":"$2b$12$VtfVij6zz20F/Qr0Ri18O.11.0LJMMXyJxAJAHQbKU0jC96eo2fr.","active":true}

Setup SSH keys

SSH container in the API can be used to upload files remotely to the storage container. Later, those files can be downloaded using HTTP from the Nginx container.

We need to generate SSH keys to use SSH docker container.

Use the below command to generate SSH key. It will store private key to /home/username/.ssh/id_rsa_kernelci-api file and public key to /home/username/.ssh/id_rsa_kernelci-api.pub file.

$ ssh-keygen -f ~/.ssh/id_rsa_kernelci-api

Use the below command to copy the public key to ssh/user-data directory.

$ cat ~/.ssh/id_rsa_kernelci-api.pub >> docker/ssh/user-data/authorized_keys

SSH docker container will have /home/kernelci/.ssh/authorized_keys file. Now, the user will be able to SSH to container using private key.

$ ssh -i ~/.ssh/id_rsa_kernelci-api -p 8022 kernelci@localhost

SSH setup on WSL

In case of running setup on WSL (Windows Subsystem for Linux), we need to have certain file permissions to be able to login to kernelci-ssh container using SSH authorization keys.

Use the below commands to check permissions for user-data directory and authorized_keys file in kernelci-api directory.

$ ls -lrt kernelci-api/docker/ssh/
total 5
-rwxrwxrwx 1 user user  652 Dec 29 11:31 Dockerfile
-rwxrwxrwx 1 user user 3289 Feb  9 16:25 sshd_config
drwxrwxrwx 1 user user  512 Feb 11 14:32 user-data
$ ls -lrt kernelci-api/docker/ssh/user-data/
total 1
-rwxrwxrwx 1 user user   0 Feb 10 15:59 authorized_keys.sample
-rwxrwxrwx 1 user user 574 Feb 11 14:35 authorized_keys

We need user-data directory permission to be 700(drwxr-xr-x) and authorized_keys file permission to be 644(-rw-r–r–). The reason being is, SSH key authorization will not work if the public key file has all the permissions enabled i.e. set to 777(rwxrwxrwx).

If we don’t have these permissions already set then we need to change them using the below commands.

$ chmod 700 kernelci-api/docker/ssh/user-data
$ chmod 644 kernelci-api/docker/ssh/user-data/authorized_keys

If running chmod command doesn’t affect the permissions, we need to add the below line to /etc/wsl.conf file and restart the wsl service to change them successfully:

options = "metadata"

Setting up a Pipeline instance

The pipeline can perform a minimal set of tests using solely the API and its associated storage. More advanced use-cases would involve other runtime environments such as Kubernetes LAVA, KCIDB credentials to send data etc. On this page, we’ll focus on the simple case with just a docker-compose API instance as described in the previous section and one instance for the pipeline.

Configure the API token

The previous section about setting up the API explains how to generate a token. It can be made available to the pipeline clients by storing it in the .env file which provides environment variables for the Docker containers:

echo "API_TOKEN=<your token>" >> .env

Start docker-compose

Then the pipeline can simply be started with docker-compose:

docker-compose up --build

It should show some logs like this:

$ docker-compose up
Recreating kernelci-pipeline-tarball     ... done
Recreating kernelci-pipeline-trigger     ... done
Recreating kernelci-pipeline-runner      ... done
Recreating kernelci-pipeline-notifier    ... done
Recreating kernelci-pipeline-test_report ... done
Recreating kernelci-pipeline-kcidb       ... done
Attaching to kernelci-pipeline-tarball, kernelci-pipeline-test_report, kernelci-pipeline-kcidb, kernelci-pipeline-runner, kernelci-pipeline-notifier, kernelci-pipeline-trigger
kernelci-pipeline-tarball | Listening for new checkout events
kernelci-pipeline-tarball | Press Ctrl-C to stop.
kernelci-pipeline-test_report | Listening for test completion events
kernelci-pipeline-test_report | Press Ctrl-C to stop.
kernelci-pipeline-notifier | Listening for events...
kernelci-pipeline-notifier | Press Ctrl-C to stop.
kernelci-pipeline-runner | Listening for completed checkout events
kernelci-pipeline-runner | Press Ctrl-C to stop.
kernelci-pipeline-trigger | Sending revision node to API: 551acdc3c3d2b6bc97f11e31dcf960bc36343bfc
kernelci-pipeline-trigger | Node id: 6233a47a4d5e52296f57e3b0
kernelci-pipeline-notifier | Time                        Commit        Status    Name
kernelci-pipeline-notifier | 2022-03-17 21:13:30.673172  551acdc3c3d2  Pending   checkout
kernelci-pipeline-tarball | Updating repo for mainline

Check the results

The tarball step can take a while, especially the first time as it sets up a full Linux kernel repository and checks out the source code. If things work correctly, there should be a test report printed in the logs eventually:

kernelci-pipeline-test_report | mainline/master v5.17-rc8-45-g551acdc3c3d2: 1 runs, 0 failures
kernelci-pipeline-test_report |
kernelci-pipeline-test_report | test            | result
kernelci-pipeline-test_report | ----------------+-------
kernelci-pipeline-test_report | check-describe  | pass
kernelci-pipeline-test_report |
kernelci-pipeline-test_report |   Tree:     mainline
kernelci-pipeline-test_report |   Branch:   master
kernelci-pipeline-test_report |   Describe: v5.17-rc8-45-g551acdc3c3d2
kernelci-pipeline-test_report |   URL:      https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernelci-pipeline-test_report |   SHA1:     551acdc3c3d2b6bc97f11e31dcf960bc36343bfc

You may also check the logs from the notifier which prints all the events sent by the API (run this in a separate shell if docker-compose is running in the foreground):

$ docker-compose logs notifier
Attaching to kernelci-pipeline-notifier
kernelci-pipeline-notifier | Listening for events...
kernelci-pipeline-notifier | Press Ctrl-C to stop.
kernelci-pipeline-notifier | Time                        Commit        Status    Name
kernelci-pipeline-notifier | 2022-03-17 21:13:30.673172  551acdc3c3d2  Pending   checkout
kernelci-pipeline-notifier | 2022-03-17 21:14:30.837013  551acdc3c3d2  Pass      checkout
kernelci-pipeline-notifier | 2022-03-17 21:14:30.912592  551acdc3c3d2  Pending   check-describe
kernelci-pipeline-notifier | 2022-03-17 21:14:54.952120  551acdc3c3d2  Pass      check-describe

Meanwhile, the API logs should also show all the API calls (here’s just the first few lines):

kernelci-api | INFO:     172.24.0.1:38268 - "POST /subscribe/node HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38290 - "POST /subscribe/node HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38300 - "POST /subscribe/node HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38310 - "POST /subscribe/node HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38322 - "GET /nodes?revision.commit=551acdc3c3d2b6bc97f11e31dcf960bc36343bfc HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38326 - "POST /node HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38316 - "GET /listen/920 HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38306 - "GET /listen/919 HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38296 - "GET /listen/918 HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38278 - "GET /listen/917 HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38334 - "GET /node/6233a47a4d5e52296f57e3b0 HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38340 - "GET /node/6233a47a4d5e52296f57e3b0 HTTP/1.1" 200 OK
kernelci-api | INFO:     172.24.0.1:38336 - "GET /node/6233a47a4d5e52296f57e3b0 HTTP/1.1" 200 OK

What next?

The check-describe test is a very basic hack to quickly exercise the pipeline. It will compare the string produced by git describe and the kernel revision information from the top of the Makefile in the source tree. This is run locally as a Python script, directly in the Docker container where runner.py is running. It’s not practical to run all tests like this, they would typically need to be scheduled in a different runtime environment such as Kubernetes or LAVA. Having the ability to run some tests locally mostly helps with developing things quickly and in a self-contained way.

There are a number of parameters used in docker-compose.yaml files which can be adjusted for various reasons, typically when deploying a public instance. Also, some extra services can be used such as Kubernetes, LAVA, KCIDB, Atlas, Cloud storage etc. All this will need to be detailed in full in the documentation as things progress.

Last modified March 18, 2022