status-go/MAILSERVER.md

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# Description
A poorly named "Mailserver" is essentially a Whisper node that stores message history in either a LevelDB or PostgreSQL database.
A Status app user can run their own Mailserver for faster message retrieval or additional security.
# Service Ports
* `30303` TCP/UDP - [DevP2P](https://github.com/ethereum/devp2p) wire protocol port. Must __ALWAYS__ be public.
* `8545` TCP - [JSON RPC](https://github.com/ethereum/wiki/wiki/json-rpc) management port. Must __NEVER__ be public.
* `9090` TCP - [Prometheus](https://prometheus.io/docs/concepts/data_model/) metrics port. Should not be public.
# Setup methods
This document describes the two alternative ways to start a Status Mailserver:
* [Docker Compose](https://docs.docker.com/compose/) - More self-contained and portable
* [Systemd Service](https://www.freedesktop.org/wiki/Software/systemd/) - More local and configurable
## Docker Compose
The simplest way is to just use:
```
make run-mailserver-docker
```
This will generate the necessary config, compose and then start the container.
For more details read the [README](_assets/compose/mailserver/README.md).
## Systemd Service
The other way is to run the `mailserver` under `systemd`:
```
make run-mailserver-systemd
```
This will generate the necessary config, define and then start a user service.
Use `sudo` if you want it to be a system service.
For more details read the [README](_assets/systemd/mailserver/README.md).
# Service Healthcheck
There's two simple ways to verify your Mailserver is up and running.
## Query Metrics
By making an HTTP request to the metrics port(`9090` by default) you can check if you Mailserver is receiving envelopes:
```sh
> curl -sS localhost:9090/metrics | grep '^waku_envelopes_received_total'
waku_envelopes_received_total 123
```
Or numbers and types of peers connected:
```sh
> curl -sS localhost:9090/metrics | grep '^p2p_peers_count'
p2p_peers_count{platform="linux-amd64",type="Statusd",version="v0.79.0"} 3
```
## JSON RPC Calls
The JSON RPC port (`8545` by default) allows you to manage your node.
You can list connected peers by doing:
```sh
> export RPC_HOST=localhost RPC_PORT=8545
> _assets/scripts/rpc.sh admin_peers | jq -r '.result[].network.remoteAddress'
34.68.132.118:30305
134.209.136.123:30305
178.128.141.249:443
```
Where [`rpc.sh`](./_assets/scripts/rpc.sh) is simply a thin wrapper around `curl`.
You can use it to easily add peers too:
```sh
> _assets/scripts/rpc.sh admin_addPeer enode://7aa648d6e855950b2e3d3bf220c496e0cae4adfddef3e1e6062e6b177aec93bc6cdcf1282cb40d1656932ebfdd565729da440368d7c4da7dbd4d004b1ac02bf8@178.128.142.26:443
{"jsonrpc": "2.0", "id": 1, "result": true}
```