Host /etc/hosts in docker

[andyneff]

Currently docker makes an /etc/hosts file dynamically. So if there are any /etc/hosts settings on the host needed by a container, it will fail

Bad ideas

• mount hosts:/etc/hosts on top of container:/etc/hosts. This will loose entries that belong there for a container, and will break in more complicated scenarios.
• mount hosts:/etc/hosts into container:/etc/hosts2, and have an entrypoint concatenate the two. This will not work. /etc/hosts is read only, (and dynamic I think).
• network mode = hosts. That's not segregated at ALL!

Ideas:

• mount hosts:/etc/hosts into container:/etc/hosts2, and have an entrypoint concatenate the two.
• Add the ability to Just-docker-compose to parse /etc/hosts, ignore localhost entries, and turn additional entries into extra_hosts entries.

Related:

• SO