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Ignore invalid host header between go1.6 and old docker clients

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BenchmarkWithHack-4	   50000	     37082 ns/op	  44.50
MB/s	    1920 B/op	      30 allocs/op
BenchmarkNoHack-4  	   50000	     30829 ns/op	  53.52
MB/s	       0 B/op	       0 allocs/op

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Signed-off-by: Antonio Murdaca <runcom@redhat.com>
This commit is contained in:
Antonio Murdaca 2016-04-12 17:21:20 +02:00 committed by Tibor Vass
parent 637048e176
commit 09be3c1129
1 changed files with 13 additions and 0 deletions
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docs/reference/commandline/dockerd.md
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@ -849,6 +849,19 @@ set like this:
export DOCKER_TMPDIR=/mnt/disk2/tmp
/usr/local/bin/dockerd -D -g /var/lib/docker -H unix:// > /var/lib/docker-machine/docker.log 2>&1
Docker clients <= 1.9.2 used an invalid Host header when making request to the
daemon. Docker 1.12 is built using golang 1.6 which is now checking the validity
of the Host header and as such clients <= 1.9.2 can't talk anymore to the daemon.
Docker supports overcoming this issue via a Docker daemon
environment variable. In case you are seeing this error when contacting the
daemon:
Error response from daemon: 400 Bad Request: malformed Host header
The `DOCKER_HTTP_HOST_COMPAT` can be set like this:
DOCKER_HTTP_HOST_COMPAT=1 /usr/local/bin/dockerd ...
## Default cgroup parent