feature: add logrotate for librenms log files

Dockerfile

@@ -23,6 +23,7 @@ RUN apk --update --no-cache add \
     imagemagick \
     ipmitool \
     iputils \
+    logrotate \
     libcap-utils \
     mariadb-client \
     monitoring-plugins \

README.md

@@ -159,6 +159,18 @@ Image: librenms/librenms:latest
 * `DISPATCHER_NODE_ID`: Unique node ID for your dispatcher service
 * `DISPATCHER_ARGS`: Additional args to pass to the [dispatcher service](https://github.com/librenms/librenms/blob/master/librenms-service.py)
 
+### Logrotate
+
+> **Note**
+>
+> Logrotate could be enabled to avoid large log files.
+
+> **Warning**
+>
+> When activated, logs exceeding the specified retention period will be deleted.
+
+* `LOGROTATE_ENABLED`: Set to `true` to enable logrotate for LibreNMS logs (default `false`)
+
 ### Syslog-ng
 
 > **Warning**

rootfs/etc/cont-init.d/03-config.sh

@@ -257,3 +257,22 @@ for template in ${templates}; do
   echo "  Adding ${template} alert template"
   ln -sf /data/alert-templates/${template} ${LIBRENMS_PATH}/resources/views/alerts/templates/${template}
 done
+
+# Configure logrotate if enabled except for syslogng and snmptrapd sidecars
+if [ ${LOGROTATE_ENABLED:-false} = true ] && [ "$SIDECAR_SYSLOGNG" != "1" ] && [ "$SIDECAR_SNMPTRAPD" != "1" ];
+then
+  cat <<'EOF' > /etc/logrotate.d/librenms
+  ${LIBRENMS_PATH}/logs/*.log {
+    su librenms librenms
+    create 664 librenms librenms
+    weekly
+    rotate 6
+    compress
+    delaycompress
+    missingok
+    notifempty
+    copytruncate
+  }
+EOF
+
+fi