Outbound connections from Docker with VirtualBox not working?

Using Docker and VirtualBox and having trouble making outbound connections? For instance, you might be getting errors like:

curl: (7) Failed connect to; No route to host


Error: Redis connection to redis:6379 failed - connect EHOSTUNREACH

Here’s what I did to fix it. First I ssh’d into the Docker machine:

$ docker-machine ssh dev

And took a look at the network config:

$ ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 08:00:27:C8:C7:50
inet addr:  Bcast:  Mask:
inet6 addr: fe80::a00:27ff:fec8:c750/64 Scope:Link
RX packets:230796 errors:0 dropped:0 overruns:0 frame:0
TX packets:62400 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:238029328 (227.0 MiB)  TX bytes:4768029 (4.5 MiB)

Where I see eth0 is configured on this subnet and doesn’t seem to be modifiable. So I fixed this via:

$ docker-machine stop dev
$ VBoxManage modifyvm dev --natnet1 ""
$ docker-machine restart dev

And boom, just like that it works:

$ docker@dev:~$ curl
HTTP/1.1 200 OK

Follow me on Twitter to keep up with what I’ve learned building my personal finance tool, Stash.

Subscribe to my mailing list to learn more about technology and business.

Your email will never be shared with anyone else.

Read more posts …
Written: November 17th, 2015
Categories: docker, virtualbox