imroc / docker-logrotate

A multi-platform docker container of logrotate, can be used as a sidecar

docker-logrotate

A multi-platform docker container of logrotate, can be used as a sidecar.

Docker image: imroc/logrotate:latest.

Configuration

For crond, you can configure it through the following environment variables:

Environment	Description	Default
CRON_EXPR	cron expression for logrotate	*/5 * * * * (every 5 minutes)
CROND_LOGLEVEL	log level of crond, 0~8, 0 is the most verbose	8

For logrotate, you can directly mount logrotate.conf to /etc/logrotate.conf, or configure the following environment variables:

Environment	Description	Default
LOGROTATE_FILE_PATTERN	the file pattern of logs
LOGROTATE_FILESIZE	Files exceeding this size can be rotated	50M
LOGROTATE_FILENUM	Number of files to keep rotating	5

Example: Rotate the logs of nginx ingress controller

Configure values.yaml for ingress-nginx helm chart:

controller:
  config:
    access-log-path: /var/log/nginx/nginx_access.log
    error-log-path: /var/log/nginx/nginx_error.log
  extraVolumes:
    - name: log
      emptyDir: {}
  extraVolumeMounts:
    - name: log
      mountPath: /var/log/nginx
  extraContainers: # logrotate sidecar
    - name: logrotate
      image: imroc/logrotate:latest
      imagePullPolicy: IfNotPresent
      env:
        - name: LOGROTATE_FILE_PATTERN
          value: "/var/log/nginx/nginx_*.log"
        - name: LOGROTATE_FILESIZE
          value: "20M"
        - name: LOGROTATE_FILENUM
          value: "10"
        - name: CRON_EXPR
          value: "*/1 * * * *"
        - name: CROND_LOGLEVEL
          value: "7"
      volumeMounts:
        - name: log # share log directory
          mountPath: /var/log/nginx