Docker Service Logger

Dockereized simple script to monitor and log swarm services. the logs are written to the system output and can be transferred monitoring system such as ELK/splunk

Log format

the log is in json format and contain the following fields:

• service - the name of the service
• mode - the mode of deployment of the service (global/replicated)
• replicas_text - number of running instances as text for display
• running - number of running instances
• total - the total number of instances which should run
• running_pct - perecentage of running instance out of total

Example Logs

{"service":"metricbeat","mode":"global","replicas_text":"5/5","running":5,"total":5,"running_pct":1}
{"service":"redis","mode":"replicated","replicas_text":"3/4","running":3,"total":4,"running_pct":0.75}

Versions

There are two versios, debian which comes without the docker binaries and must be mounted against docker on the host, and alpine which contains docker binaries inside and needs to mount only the docker sock

Usage

Command line

alpine version:

docker run -d -v /var/run/docker.sock:/var/run/docker.sock docker-service-logger:alpine-1.0

debian version:

docker run -d -v /var/run/docker.sock:/var/run/docker.sock -v /usr/bin/docker:/usr/bin/docker docker-service-logger:debian-1.0

Compose file

version: '3.7'
services:
  services-logger:
    image: 'docker-service-logger:alpine-1.0'
      volumes:
        - /var/run/docker.sock:/var/run/docker.sock
      deploy:
        replicas: 1
        placement:
          constraints:
            - node.role == manager