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Monit - Docker/Kubernetes - UNIX Systems Management

Run Monit inside docker ( )

Monit

Monit is a free open source utility for managing and monitoring, processes, programs, files, directories and filesystems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.

Supported architectures

Docker setup

Install docker: https://docs.docker.com/engine/installation/ Install docker compose: https://docs.docker.com/compose/install/ Docker documentation: https://docs.docker.com/

Build-in docker image

  • build docker image docker build -t monit .
  • start monit: docker run -ti -p 2812:2812 -v $(pwd)/monitrc:/etc/monitrc monit

ENV VARS

ENVs Description
SLACK_URL Webhook url for slack notifications (required for slack)
PUSH_OVER_TOKEN Push over api token (required for pushover)
PUSH_OVER_USER Push over api user (requiredfor pushover)
DEBUG If set with 1 it will put monit in verbose mode

Docker Hub image

  • pull docker image from docker hub: docker pull diogopms/monit-docker-kubernetes
  • start monit: docker run -ti -p 2812:2812 -v $(pwd)/monitrc:/etc/monitrc diogopms/monit-docker-kubernetes
  • create a docker container:
#Normal mode (support slack and pushover)
docker run -it \
  -p 2812:2812 \
  -v $(pwd)/monitrc:/etc/monitrc \
  -e "SLACK_URL=<SLACK_URL>" \
  -e "PUSH_OVER_TOKEN=<PUSH_OVER_TOKEN>" \
  -e "PUSH_OVER_USER=<PUSH_OVER_USER>" \
  diogopms/monit-docker-kubernetes

#Debug mode
docker run -it \
  -p 2812:2812 \
  -v $(pwd)/monitrc:/etc/monitrc \
  -e "SLACK_URL=<SLACK_URL>" \
  -e "PUSH_OVER_TOKEN=<PUSH_OVER_TOKEN>" \
  -e "PUSH_OVER_USER=<PUSH_OVER_USER>" \
  -e "DEBUG=1" \
  diogopms/monit-docker-kubernetes

Example monitrc (Slack)

set daemon 20
set log syslog
# Web interface
# set httpd port 2812 and allow admin:monit

check host www.google.com with address www.google.com
  if failed
      port 443 protocol https
      request /
      status = 200
      for 2 cycles
  then exec "/bin/slack"
    else if succeeded then exec "/bin/slack"
EOF

Example monitrc (Pushover)

set daemon 20
set log syslog
# Web interface
# set httpd port 2812 and allow admin:monit

check host www.google.com with address www.google.com
  if failed
      port 443 protocol https
      request /
      status = 200
      for 2 cycles
  then exec "/bin/pushover"
    else if succeeded then exec "/bin/pushover"
EOF

Supported notifications

Kubernetes

Troubleshooting

If when starting Monit returns the following message: The control file '/etc/monitrc' permission 0755 is wrong, maximum 0700 allowed, simply give the appropriate permissions to monitrc: chmod 700 monitrc.