Documentation enhancements (#207)

This PR addresses the issue listed in issue #170 regarding how to set up rootless Docker. It also expands on the documentation to show how to create deployments for different environments.

Co-authored-by: ccureau <ccureau@noreply.gitea.io>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/207
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: Chris Cureau <cmcureau@gmail.com>
Co-committed-by: Chris Cureau <cmcureau@gmail.com>
This commit is contained in:
Chris Cureau 2023-06-05 08:46:15 +00:00 committed by Jason Song
parent e3271d8469
commit a384adbbc6
8 changed files with 225 additions and 28 deletions

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@ -88,32 +88,6 @@ You can specify the configuration file path with `-c`/`--config` argument.
./act_runner -c config.yaml daemon # run with config file
```
### Run a docker container
### Example Deployments
```sh
docker run -e GITEA_INSTANCE_URL=http://192.168.8.18:3000 -e GITEA_RUNNER_REGISTRATION_TOKEN=<runner_token> -v /var/run/docker.sock:/var/run/docker.sock -v $PWD/data:/data --name my_runner gitea/act_runner:nightly
```
The `/data` directory inside the docker container contains the runner API keys after registration.
It must be persisted, otherwise the runner would try to register again, using the same, now defunct registration token.
### Running in docker-compose
```yml
...
gitea:
image: gitea/gitea
...
runner:
image: gitea/act_runner
restart: always
depends_on:
- gitea
volumes:
- ./data/act_runner:/data
- /var/run/docker.sock:/var/run/docker.sock
environment:
- GITEA_INSTANCE_URL=<instance url>
- GITEA_RUNNER_REGISTRATION_TOKEN=<registration token>
```
Check out the [examples](examples) directory for sample deployment types.

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examples/README.md Normal file
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## Usage Examples for `act_runner`
Here you will find usage and deployment examples that can be directly used in a Gitea setup. Please feel free to contribute!
- [`docker`](docker)
Contains scripts and instructions for running containers on a workstation or server with Docker installed.
- [`docker-compose`](docker-compose)
Contains examples of using `docker-compose` to manage deployments.
- [`kubernetes`](kubernetes)
Contains examples of setting up deployments in Kubernetes clusters.
- [`vm`](vm)
Contains examples for setting up virtual or physical servers.

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### Running `act_runner` using `docker-compose`
```yml
...
gitea:
image: gitea/gitea
...
runner:
image: gitea/act_runner
restart: always
depends_on:
- gitea
volumes:
- ./data/act_runner:/data
- /var/run/docker.sock:/var/run/docker.sock
environment:
- GITEA_INSTANCE_URL=<instance url>
- GITEA_RUNNER_REGISTRATION_TOKEN=<registration token>
```

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### Run `act_runner` in a Docker Container
```sh
docker run -e GITEA_INSTANCE_URL=http://192.168.8.18:3000 -e GITEA_RUNNER_REGISTRATION_TOKEN=<runner_token> -v /var/run/docker.sock:/var/run/docker.sock -v $PWD/data:/data --name my_runner gitea/act_runner:nightly
```
The `/data` directory inside the docker container contains the runner API keys after registration.
It must be persisted, otherwise the runner would try to register again, using the same, now defunct registration token.

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@ -0,0 +1,8 @@
## Kubernetes Docker in Docker Deployment with `act_runner`
NOTE: Docker in Docker (dind) requires elevated privileges on Kubernetes. The current way to achieve this is to set the pod `SecurityContext` to `privileged`. Keep in mind that this is a potential security issue that has the potential for a malicious application to break out of the container context.
Files in this directory:
- [`dind-docker.yaml`](dind-docker.yaml)
How to create a Deployment and Persistent Volume for Kubernetes to act as a runner. The Docker credentials are re-generated each time the pod connects and does not need to be persisted.

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kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: act-runner-vol
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: standard
---
apiVersion: v1
data:
token: << base64 encoded registration token >>
kind: Secret
metadata:
name: runner-secret
type: Opaque
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: act-runner
name: act-runner
spec:
replicas: 1
selector:
matchLabels:
app: act-runner
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: act-runner
spec:
restartPolicy: Always
volumes:
- name: docker-certs
emptyDir: {}
- name: runner-data
persistentVolumeClaim:
claimName: act-runner-vol
containers:
- name: runner
image: gitea/act_runner:nightly
command: ["sh", "-c", "while ! nc -z localhost 2376 </dev/null; do echo 'waiting for docker daemon...'; sleep 5; done; /sbin/tini -- /opt/act/run.sh"]
env:
- name: DOCKER_HOST
value: tcp://localhost:2376
- name: DOCKER_CERT_PATH
value: /certs/client
- name: DOCKER_TLS_VERIFY
value: "1"
- name: GITEA_INSTANCE_URL
value: http://gitea-http.gitea.svc.cluster.local:3000
- name: GITEA_RUNNER_REGISTRATION_TOKEN
valueFrom:
secretKeyRef:
name: runner-secret
key: token
volumeMounts:
- name: docker-certs
mountPath: /certs
- name: runner-data
mountPath: /data
- name: daemon
image: docker:23.0.6-dind
env:
- name: DOCKER_TLS_CERTDIR
value: /certs
securityContext:
privileged: true
volumeMounts:
- name: docker-certs
mountPath: /certs

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## `act_runner` on Virtual or Physical Servers
Files in this directory:
- [`rootless-docker.md`](rootless-docker.md)
How to set up a rootless docker implementation of the runner.

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## Using Rootless Docker with`act_runner`
Here is a simple example of how to set up `act_runner` with rootless Docker. It has been created with Debian, but other Linux should work the same way.
Note: This procedure needs a real login shell -- using `sudo su` or other method of accessing the account will fail some of the steps below.
As `root`:
- Create a user to run both `docker` and `act_runner`. In this example, we use a non-privileged account called `rootless`.
```bash
useradd -m rootless
passwd rootless
```
- Install [`docker-ce`](https://docs.docker.com/engine/install/)
- (Recommended) Disable the system-wide Docker daemon
``systemctl disable --now docker.service docker.socket``
As the `rootless` user:
- Follow the instructions for [enabling rootless mode](https://docs.docker.com/engine/security/rootless/)
- Add the following lines to the `/home/rootless/.bashrc`:
```bash
export XDG_RUNTIME_DIR=/home/rootless/.docker/run
export PATH=/home/rootless/bin:$PATH
export DOCKER_HOST=unix:///run/user/1001/docker.sock
```
- Reboot. Ensure that the Docker process is working.
- Create a directory for saving `act_runner` data between restarts
`mkdir /home/rootless/act_runner`
- Register the runner from the data directory
```bash
cd /home/rootless/act_runner
act_runner register
```
- Generate a `act_runner` configuration file in the data directory. Edit the file to adjust for the system.
```bash
act_runner generate-config >/home/rootless/act_runner/config
```
- Create a new user-level`systemd` unit file as `/home/rootless/.config/systemd/user/act_runner.service` with the following contents:
```bash
Description=Gitea Actions runner
Documentation=https://gitea.com/gitea/act_runner
After=docker.service
[Service]
Environment=PATH=/home/rootless/bin:/sbin:/usr/sbin:/home/rootless/bin:/home/rootless/bin:/home/rootless/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
Environment=DOCKER_HOST=unix:///run/user/1001/docker.sock
ExecStart=/usr/bin/act_runner daemon -c /home/rootless/act_runner/config
ExecReload=/bin/kill -s HUP $MAINPID
WorkingDirectory=/home/rootless/act_runner
TimeoutSec=0
RestartSec=2
Restart=always
StartLimitBurst=3
StartLimitInterval=60s
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TasksMax=infinity
Delegate=yes
Type=notify
NotifyAccess=all
KillMode=mixed
[Install]
WantedBy=default.target
```
- Reboot
After the system restarts, check that the`act_runner` is working and that the runner is connected to Gitea.
````bash
systemctl --user status act_runner
journalctl --user -xeu act_runner