# Getting Server Status

Once KumoMTA is installed, you can check on the server status with systemctl.

```console
$ sudo systemctl status kumomta
```

The result should look something like this:

```
 kumomta.service - KumoMTA SMTP service
     Loaded: loaded (/lib/systemd/system/kumomta.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2023-04-27 22:59:06 MST; 10h ago
   Main PID: 17912 (kumod)
      Tasks: 28 (limit: 19190)
     Memory: 257.1M
     CGroup: /system.slice/kumomta.service
             └─17912 /opt/kumomta/sbin/kumod --policy /opt/kumomta/etc/policy/init.lua --user kumod

Apr 27 22:59:06 kdev2.kumomta.com systemd[1]: Started KumoMTA SMTP service.
Apr 27 22:59:06 kdev2.kumomta.com kumod[17912]: 2023-04-28T05:59:06.444479Z  INFO main kumod::memory: using limits: soft=Some("12.58 GB"), hard=So>
Apr 27 22:59:06 kdev2.kumomta.com kumod[17912]: 2023-04-28T05:59:06.450824Z  INFO localset-2 kumod::http_server: http listener on 0.0.0.0:8000
Apr 27 22:59:06 kdev2.kumomta.com kumod[17912]: 2023-04-28T05:59:06.471926Z  INFO localset-2 kumod::spool: starting enumeration for meta
Apr 27 22:59:06 kdev2.kumomta.com kumod[17912]: 2023-04-28T05:59:06.471995Z  INFO localset-2 kumod::smtp_server: smtp listener on 0.0.0.0:25
Apr 27 22:59:06 kdev2.kumomta.com kumod[17912]: 2023-04-28T05:59:06.472008Z  INFO localset-2 kumod::smtp_server: smtp listener on 0.0.0.0:2026
Apr 27 22:59:06 kdev2.kumomta.com kumod[17912]: 2023-04-28T05:59:06.475882Z  INFO localset-2 kumod: initialization complete
```

The above is from a newer installation, but the log will grow.  If you are
debugging an older install, `journalctl -r -n 10 -u kumomta.service` will show
the last 10 lines (`-n 10`) in reverse order (`-r`).  `man journalctl` is your
friend.

If you need to find the installed version, you can run:

```console
$ /opt/kumomta/sbin/kumod --version
```

This will be important if you ever need to reach out for support.

## Monitoring

If you have configured an HTTP listener, you can access server metrics in Prometheus format with:

```console
$ curl -i 'http://localhost:8000/metrics'
```

That will show a long form of the server metrics with detailed comments.

If you want just the data in a nice JSON format, use:

```console
$ curl -i 'http://localhost:8000/metrics.json'
```

Metrics available include the following at the time of writing, and will
increase as we build out the product:

  * `connection_count`: number of active connections
  * `lua_count`: the number of lua contexts currently alive
  * `lua_load_count`: how many times the policy lua script has been loaded into a new context
  * `lua_spare_count`: the number of lua contexts available for reuse in the pool
  * `memory_limit`: soft memory limit measured in bytes
  * `memory_usage`: number of bytes of used memory

## Using kcli

Two handy commands are:

* [kcli queue-summary](../../reference/kcli/queue-summary.md) to show a textual representation of queue depths
* [kcli top](../../reference/kcli/top.md) to show a TUI charting top-line metrics

These depend upon having the HTTP listener configured so that the metrics
endpoint can be accessed.

## Setting up a Grafana Dashboard

You will need to [install
Prometheus](https://prometheus.io/docs/prometheus/latest/installation/) to act
as a datasource, and [install
Grafana](https://grafana.com/docs/grafana/latest/setup-grafana/installation/)
for its dashboard capabilities.

With Prometheus installed and available, configure it to collect data from
your kumod instances using a scraper configuration like this:

```yaml
scrape_configs:
  - job_name: kumomta
    scrape_interval: 5s
    metrics_path: /metrics
    static_configs:
      - targets:
          - 'kumomta-1:8000'
          - 'kumomta-2:8000'
```

In the above configuration `kumomta-1:8000` is the hostname (or IP address) of one
of the machines running kumod, and `8000` is the HTTP listener port it has open.
`kumomta-2:8000` is the `IP:port` of another instance of kumod; you can list out
as many as are present in your infrastructure.

With the Prometheus datasource in place, you can [import our starter
dashboard](https://grafana.com/grafana/dashboards/21391-kumomta/) in the
Grafana UI by entering its ID number `21391` or otherwise downloading the JSON
[from the dashboard
page](https://grafana.com/grafana/dashboards/21391-kumomta/) and then importing
it into your Grafana instance directly.