feat(docs): Add Kubernetes documentation with sample (#1387)

Reviewed-on: https://forgejo.ellis.link/continuwuation/continuwuity/pulls/1387
Reviewed-by: Jade Ellis <jade@ellis.link>
Co-authored-by: elisaado <forgejoellis@elisaado.com>
Co-committed-by: elisaado <forgejoellis@elisaado.com>
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# Continuwuity for Kubernetes
Continuwuity doesn't support horizontal scalability or distributed loading
natively. However, [a community-maintained Helm Chart is available here to run
natively. However, a deployment in Kubernetes is very similar to the docker
setup. This is because Continuwuity can be fully configured using environment
variables. A sample StatefulSet is shared below. The only thing missing is
a PVC definition (named `continuwuity-data`) for the volume mounted to
the StatefulSet, an Ingress resources to point your webserver to the
Continuwuity Pods, and a Service resource (targeting `app.kubernetes.io/name: continuwuity`)
to glue the Ingress and Pod together.
Carefully go through the `env` section and add, change, and remove any env vars you like using the [Configuration reference](https://continuwuity.org/reference/config.html)
```yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: continuwuity
namespace: matrix
labels:
app.kubernetes.io/name: continuwuity
spec:
replicas: 1
serviceName: continuwuity
podManagementPolicy: Parallel
selector:
matchLabels:
app.kubernetes.io/name: continuwuity
template:
metadata:
labels:
app.kubernetes.io/name: continuwuity
spec:
securityContext:
sysctls:
- name: net.ipv4.ip_unprivileged_port_start
value: "0"
containers:
- name: continuwuity
# use a sha hash <3
image: forgejo.ellis.link/continuwuation/continuwuity:latest
imagePullPolicy: IfNotPresent
ports:
- name: http
containerPort: 80
volumeMounts:
- mountPath: /data
name: data
subPath: data
securityContext:
capabilities:
add:
- NET_BIND_SERVICE
env:
- name: TOKIO_WORKER_THREADS
value: "2"
- name: CONTINUWUITY_SERVER_NAME
value: "example.com"
- name: CONTINUWUITY_DATABASE_PATH
value: "/data/db"
- name: CONTINUWUITY_DATABASE_BACKEND
value: "rocksdb"
- name: CONTINUWUITY_PORT
value: "80"
- name: CONTINUWUITY_MAX_REQUEST_SIZE
value: "20000000"
- name: CONTINUWUITY_ALLOW_FEDERATION
value: "true"
- name: CONTINUWUITY_TRUSTED_SERVERS
value: '["matrix.org"]'
- name: CONTINUWUITY_ADDRESS
value: "0.0.0.0"
- name: CONTINUWUITY_ROCKSDB_PARALLELISM_THREADS
value: "1"
- name: CONTINUWUITY_WELL_KNOWN__SERVER
value: "matrix.example.com:443"
- name: CONTINUWUITY_WELL_KNOWN__CLIENT
value: "https://matrix.example.com"
- name: CONTINUWUITY_ALLOW_REGISTRATION
value: "false"
- name: RUST_LOG
value: info
readinessProbe:
httpGet:
path: /_matrix/federation/v1/version
port: http
periodSeconds: 4
failureThreshold: 5
resources:
# Continuwuity might use quite some RAM :3
requests:
cpu: "2"
memory: "512Mi"
limits:
cpu: "4"
memory: "2048Mi"
volumes:
- name: data
persistentVolumeClaim:
claimName: continuwuity-data
```
---
Apart from manually configuring the containers,
[a community-maintained Helm Chart is available here to run
conduwuit on Kubernetes](https://gitlab.cronce.io/charts/conduwuit)
This should be compatible with Continuwuity, but you will need to change the image reference.