I was working on setting up a docker container today (and yesterday) (and the day before).
The orginization I’m working for happens to use the 172.17.0.0/16 subnet for the IM chat server. This does not interact well with docker’s defaults of course. So to fix it, per the documentation, i set
--bip=192.168.11.0/24 in my
I also had to add an insecure registry to the system, so I threw a
--insecure-registry host:5000 option as well on the DOCKER_OPTS.
Nope. The registry won’t take. Every time I try to use
docker pull or
docker-compose up on a registry image, it keeps failing, complaining about
v2 ping attempt failed with error: tls: oversized record received with length 20527
(that’s for the search engines). This makes no sense to me, even though I hammer at it for a few hours.
--insecure-registry http://host:5000. Nope.
Just a note, all these settings are playing well each time I restart docker. I get no startup errors at all. So I check
ps -ef | grep docker and lo
root 4488 1 6 15:48 ? 00:03:53 /usr/bin/docker daemon -H fd://
Where are my options?
Turns out Docker.com is shipping an incorrect service file for Ubuntu systemd flavors. To fix, just update your service file (located at
/etc/systemd/system/multi-user.target.wants/docker.service on my system) like so:
[Service] +EnvironmentFile=-/etc/default/docker Type=notify -ExecStart=/usr/bin/docker daemon -H fd:// +ExecStart=/usr/bin/docker daemon -H fd:// $DOCKER_OPTS MountFlags=slave
Don’t forget to
systemctl daemon-reload; systemctl restart docker
Once that’s in place, I start finding all my incorrect settings.
You should use
--bip=<gateway ip>/mask or in my case,
--bip=192.168.11.1/24. This is stated in the docs on docker.com in paragraph 4 where it says “supply a specific IP address and netmask for the docker0 bridge” but that isn’t exactly obvious at first read-through.
You should also (per
docker daemon --help) use the
--insecure-registry=hostname:port form to set your custom registry.
For you time travellers, here’s my version
$ docker version Client: Version: 1.9.1 API version: 1.21 Go version: go1.4.2 Git commit: a34a1d5 Built: Fri Nov 20 13:20:08 UTC 2015 OS/Arch: linux/amd64 Server: Version: 1.9.1 API version: 1.21 Go version: go1.4.2 Git commit: a34a1d5 Built: Fri Nov 20 13:20:08 UTC 2015 OS/Arch: linux/amd64