Compose: Docker parameter "dns-opt" not implemented

[hervenicol]

Hello,

It would be nice to add support for "--dns-opt" Docker parameter.

Docker feature documented here: https://docs.docker.com/engine/userguide/networking/default_network/configure-dns/

Thanks!

[gittycat]

Yes, this is not just nice but needed.
I've hit a new (issue)[https://github.com/docker/docker/issues/22185#issuecomment-220556329] and the only decent workaround is to specify a --dns-opt (use-vc). The lack of this in compose means that I will need to start some containers from a bash script instead of from the compose file.

[mgodlewski]

I've found another workaround : Add in the entry-point a grep/echo with the options on /etc/resolv.conf:
grep 'options single-request' /etc/resolv.conf || sudo sh -c 'echo "options single-request" >> /etc/resolv.conf'

[EtienneDufresne]

yes please!

[d3ming]

The workaround suggested by @mgodlewski doesn't seem to work anymore (I'm on docker 1.12.5), the /etc/resolve.conf file seems to get replaced by a standard one even if I try to add the options single-request to /etc/resolve.conf in the Dockerfile.

Does anyone have a good workaround for this issue?

[mgodlewski]

The workaround is always working but must be set in an entrypoint (not in a the Dockerfile), since this file is generated on container startup.

[ijc]

Looks like this was implemented in c7b8278e78197b87399977c8a512ef72631816a3 circa 1.12.0.