mirror of
https://github.com/itzg/mc-router.git
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162 lines
5.9 KiB
Markdown
162 lines
5.9 KiB
Markdown
[](https://github.com/itzg/mc-router/issues)
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[](https://cloud.docker.com/u/itzg/repository/docker/itzg/mc-router)
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[](https://github.com/itzg/mc-router/releases)
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[](https://circleci.com/gh/itzg/mc-router)
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[](https://www.buymeacoffee.com/itzg)
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Routes Minecraft client connections to backend servers based upon the requested server address.
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# Usage
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```text
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-api-binding host:port
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The host:port bound for servicing API requests (env API_BINDING)
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-connection-rate-limit int
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Max number of connections to allow per second (env CONNECTION_RATE_LIMIT) (default 1)
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-cpu-profile string
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Enables CPU profiling and writes to given path (env CPU_PROFILE)
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-debug
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Enable debug logs (env DEBUG)
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-in-kube-cluster
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Use in-cluster kubernetes config (env IN_KUBE_CLUSTER)
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-kube-config string
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The path to a kubernetes configuration file (env KUBE_CONFIG)
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-kube-discovery
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Enables discovery of annotated kubernetes services (env KUBE_DISCOVERY)
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-mapping string
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Comma-separated mappings of externalHostname=host:port (env MAPPING)
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-metrics-backend string
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Backend to use for metrics exposure/publishing: discard,expvar,influxdb (env METRICS_BACKEND) (default "discard")
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-metrics-backend-config-influxdb-addr string
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(env METRICS_BACKEND_CONFIG_INFLUXDB_ADDR)
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-metrics-backend-config-influxdb-database string
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(env METRICS_BACKEND_CONFIG_INFLUXDB_DATABASE)
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-metrics-backend-config-influxdb-interval duration
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(env METRICS_BACKEND_CONFIG_INFLUXDB_INTERVAL) (default 1m0s)
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-metrics-backend-config-influxdb-password string
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(env METRICS_BACKEND_CONFIG_INFLUXDB_PASSWORD)
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-metrics-backend-config-influxdb-retention-policy string
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(env METRICS_BACKEND_CONFIG_INFLUXDB_RETENTION_POLICY)
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-metrics-backend-config-influxdb-tags value
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any extra tags to be included with all reported metrics (env METRICS_BACKEND_CONFIG_INFLUXDB_TAGS)
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-metrics-backend-config-influxdb-username string
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(env METRICS_BACKEND_CONFIG_INFLUXDB_USERNAME)
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-port port
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The port bound to listen for Minecraft client connections (env PORT) (default 25565)
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-version
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Output version and exit (env VERSION)
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```
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# REST API
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* `GET /routes`
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Retrieves the currently configured routes
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* `POST /routes`
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Registers a route given a JSON body structured like:
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```json
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{
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"serverAddress": "CLIENT REQUESTED SERVER ADDRESS",
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"backend": "HOST:PORT"
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}
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```
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* `POST /defaultRoute`
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Registers a default route to the given backend. JSON body is structured as:
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```json
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{
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"backend": "HOST:PORT"
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}
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```
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* `DELETE /routes/{serverAddress}`
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Deletes an existing route for the given `serverAddress`
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# Docker Compose Usage
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The following diagram shows how [the example docker-compose.yml](docs/docker-compose.yml)
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configures two Minecraft server services named `vanilla` and `forge`, which also become the internal
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network aliases. _Notice those services don't need their ports exposed since the internal
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networking allows for the inter-container access._
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The `router` service is only one of the services that needs to exposed on the external
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network. The `--mapping` declares how the hostname users will enter into their Minecraft client
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will map to the internal services.
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To test out this example, I added these two entries to my "hosts" file:
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```
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127.0.0.1 vanilla.example.com
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127.0.0.1 forge.example.com
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```
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# Kubernetes Usage
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## Using kubernetes service auto-discovery
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When running `mc-router` as a kubernetes pod and you pass the `--in-kube-cluster` command-line argument, then
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it will automatically watch for any services annotated with
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- `mc-router.itzg.me/externalServerName` : The value of the annotation will be registered as the external hostname Minecraft clients would used to connect to the
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routed service. The service's clusterIP and target port are used as the routed backend.
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- `mc-router.itzg.me/defaultServer` : The service's clusterIP and target port are used as the default if
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no other `externalServiceName` annotations applies.
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For example, start `mc-router`'s container spec with
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```yaml
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image: itzg/mc-router
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name: mc-router
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args: ["--in-kube-cluster"]
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```
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and configure the backend minecraft server's service with the annotation:
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```yaml
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apiVersion: v1
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kind: Service
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metadata:
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name: mc-forge
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annotations:
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"mc-router.itzg.me/externalServerName": "external.host.name"
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```
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## Example kubernetes deployment
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[This example deployment](docs/k8s-example-auto.yaml)
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* Declares an `mc-router` service that exposes a node port 25565
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* Declares a service account with access to watch and list services
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* Declares `--in-kube-cluster` in the `mc-router` container arguments
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* Two "backend" Minecraft servers are declared each with an
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`"mc-router.itzg.me/externalServerName"` annotation that declares their external server name
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```bash
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kubectl apply -f https://raw.githubusercontent.com/itzg/mc-router/master/docs/k8s-example-auto.yaml
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```
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#### Notes
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* This deployment assumes two persistent volume claims: `mc-stable` and `mc-snapshot`
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* I extended the allowed node port range by adding `--service-node-port-range=25000-32767`
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to `/etc/kubernetes/manifests/kube-apiserver.yaml`
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# Development
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## Building locally with Docker
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```bash
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docker run -it --rm \
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-v gopkg:/go/pkg \
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-v ${PWD}:/build -w /build \
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golang:1.12 \
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go build ./cmd/mc-router
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```
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## Performing snapshot release with Docker
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```bash
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docker run -it --rm \
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-v ${PWD}:/build -w /build \
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-v /var/run/docker.sock:/var/run/docker.sock \
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goreleaser/goreleaser \
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release --snapshot --rm-dist
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``` |