Error starting userland proxy: listen tcp 0.0.0.0:3306: bind: address already in use

Build Environment Databases
1

Hi there,

I am using the CircleCI 2.0 but for some reason, cannot post in the CircleCI 2.0 section.
Since this is still Database related, here’s my question:

I am using a docker-compose file that runs my dockerized app and a MySql DB.
The MySql Image exposes port 3306, however I keep getting this error when trying to bring it up:

ERROR: for db  Cannot start service db: driver failed programming external connectivity on endpoint myrepo_db_1 (dc420fc36e196cfa9ac1e4ed70bf1a513fad39231ba11f0d05b6d16d066551c0): Error starting userland proxy: listen tcp 0.0.0.0:3306: bind: address already in use
ERROR: Encountered errors while bringing up the project.

My suspition is that CircleCI already has a MySql instance runnign to “help” me. Is there a way I can disable it?

I am using the Ruby 2.3 base image on the DockerExecutor.

version: 2
executorType: docker
jobs:
  build:
    docker:
      - image: ruby:2.3