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# Docker image for munin server
## Note
The package is based on the original Scalingo docker image which was modified to run OpenShift platform.
Major modifications:
* Runs under non-privileged user
* Based on Alpine Linux
* Database and lockfiles can be mounted as a single volume
* Authentication support is dropped, email notifications are not checked
## Configuration
All the configuration is done through the environment.
### SMTP info for alerts
Email credentials used to send emails (like alerts)
* `SMTP_HOST`
* `SMTP_PORT`
* `SMTP_USERNAME`
* `SMTP_PASSWORD`
* `SMTP_USE_TLS`
* `SMTP_ALWAYS_SEND`
* `SMTP_MESSAGE`
### Alert target
Email addressed used for the alerts, require SMTP credentials.
* `ALERT_RECIPIENT`
* `ALERT_SENDER`
### List of the nodes to check
The port is always optional, default is 4949
* `NODES` format: `name1:ip1[:port1] name2:ip2[:port2] …`
* `SNMP_NODES` format: `name1:ip1[:port1]` …
* `SSH_NODES` format: `name1:ip1[:port1]` …
## Port
Container is listening on the port 8080
## Volumes
For a bit of persistency
* /minin -> everything: configuration, database, locks, and log files
* /munin/db -> db
* /munin/run -> locks
* /munin/log -> log files
## How to use the image
```
docker build -t munin-server .
docker run -d \
-p 8080:8080 \
-v /var/lib/munin:/munin \
-e SMTP_HOST=smtp.example.com \
-e SMTP_PORT=587 \
-e SMTP_USERNAME=smtp-username \
-e SMTP_PASSWORD=smtp-password \
-e SMTP_USE_TLS=false \
-e SMTP_ALWAYS_SEND=true \
-e SMTP_MESSAGE='[${var:group};${var:host}] -> ${var:graph_title} -> warnings: ${loop<,>:wfields ${var:label}=${var:value}} / criticals: ${loop<,>:cfields ${var:label}=${var:value}}' \
-e ALERT_RECIPIENT=monitoring@example.com \
-e ALERT_SENDER=alerts@example.com \
-e NODES="server1:10.0.0.1 server2:10.0.0.2" \
-e SNMP_NODES="router1:10.0.0.254:9999" \
munin-server
```
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