How to limit amount of running docker instances?

I am using one machine to host docker and launch containers on demand for other machines. However my resources are not unlimited and machines making those requests don’t have any knowledge about other requests. I’d like to limit the amount of containers that my docker host can launch to a certain amount. How can I achieve that?

  • How to make changes to httpd.conf of apache running inside DOCKER container and restart apache
  • How to get client IP from request inside haproxy docker container?
  • debug docker deamon with gdb or cgdb
  • ssh from docker gets stuck without any error
  • Dockerfile built-in environment variables documentation
  • Building a Docker Image via compose results into a new image. why?
  • how does 'tar cv --files-from /dev/null | docker import - scratch' work?
  • Fail join node to docker swarm
  • Squishing docker image without spinning a container
  • Ignore files in Google App Engine managed VM
  • Running Gatling from docker-compose
  • Unable to Connect Jenkins Windows 10 Slave to Master running
  • One Solution collect form web for “How to limit amount of running docker instances?”

    The only way I know is to write a or monitor which implements your business rules.

    That is, something that either:

    1. intercepts the calls to the docker daemon and only lets a certain amount of RAM or number of processes start, OR
    2. a separate daemon that listens to docker daemon events and kills containers when there are too many.

    There might also be some hook in the kernel to place limits on the number of cgroups/namespaces created, but I don’t know the calls offhand.

    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.