As part of the build process, I need to access a web server that is run locally on the host machine.

Is there a way the host web server (which can be configured to run on a port) can be exposed to the jenkins container.

You can bind whichever IP you want, just make sure youre not using it to anything else.

Which may work, but may not be what the OP needs or intends.

For accessing to host-based service you can use networkmode parameter.

Unfortunately it does not work on linux yet (as of April 2018).

This is documented at docs.docker.comdocker-for-macnetworking.

Are you aware of anything using this with a lot of traffic There might be overhead to proxying all the traffic through this container.

If youre trying to connect to the host anyway, just mount the socket as a volume, and youre on your way.

I arbitrarily selected 192.168.32.020 by using docker network inspect to see what was being created by default.

You may wish to add other restrictions, for example by destination port.

Dont forget to persist your iptables rules when youre happy theyre working.

I use ansibles template module to deploy my compose file with variable substitution and then use the iptables and shell modules to configure and persist the firewall rules, respectively.

Containers which are deployed on hosts stack have entire access to the host interface.

You can access local webserver in docker container with a private IP address of the host machine.

In my case, the containers are very lean and do not contain any of the networking tools necessary to extract the hosts ip address from within the container.

Allowed me to access a dev postgres from another container that did not have container access to the other container.

This was quite surprising to me, I must say, you would expect the echosystem of docker machines running on a local machine just flawlessly can access each other without too much hurdle.

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Making statements based on opinion; back them up with references or personal experience.

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Docker For Mac Host Network Mode