Custom Container Logging

Jenkins Logging

This container does not write a logfile by default. It's considered bad practise as logs should be accessed by the command docker logs. There are use case where you want to have additional log files, e.g. my use case is to relay log to Loggly Loggly Homepage. I have added a routine for logging and it's activated by defining a logfile.

Environment Variable: LOG_FILE

Example for a separate volume with a logfile:

$ docker run -d -p 8090:8080 \
  -v $(pwd)/logs:/jenkinslogs \
  -e "LOG_FILE=/jenkinslogs/jenkins.log" \
  --name jenkins \
  blacklabelops/jenkins

You can watch the log by typing cat ./logs/jenkins.log.

Logging with Loggly

Now lets hook up the container with my Loggly side-car container and relay the log to Loggly! The Full documentation of the loggly container can be found here: blacklabelops/loggly

$ docker run -d \
  --volumes-from jenkins \
  -e "LOGS_DIRECTORIES=/jenkinslogs" \
    -e "LOGGLY_TOKEN=3ere-23kkke-23j3oj-mmkme-343" \
  -e "LOGGLY_TAG=jenkinslog" \
  --name jenkinsloggly \
  blacklabelops/loggly

Note: You need a valid Loggly Customer Key in order to log to Loggly.