3:05 p.m.
I was stumped for quite a while about why I couldn't get a docker build
to run on my VM. The symptom is that the docker build can not reach the
outside world, and therefore can't pull in what it needs. This happens
even though the VM itself has no connectivity issues. Note, I assume
this is a VM thing because it happened to both mazz and myself, using
Virtual Box fedora vms, but it may not be limited to VMs. I finally
stumbled on a stack overflow entry that solved the issue [1].
Basically, you need to tell docker about your DNS servers, and also
Google's DNS server 8.8.8.8. Your mileage may vary, perhaps you'll only
need a subset of of servers, but hopefully this helps you out, because
it was a pita.
[1]
http://stackoverflow.com/questions/25130536/dockerfile-docker-build-cant-...
3:20 p.m.
I saw the same problems. One thing I don't understand is why my host's
resolve.conf isn't good enough?
https://docs.docker.com/engine/userguide/networking/default_network/confi...
"Regarding DNS settings, in the absence of the --dns=IP_ADDRESS...,
--dns-search=DOMAIN..., or --dns-opt=OPTION... options, Docker makes each container’s
/etc/resolv.conf look like the /etc/resolv.conf of the host machine (where the docker
daemon runs). When creating the container’s /etc/resolv.conf, the daemon filters out all
localhost IP address nameserver entries from the host’s original file."
I'm not having any connectivity issues from my host machine - so why does the docker
container have problems if it is using the same /etc/resolve.conf?
It's all magic to me.
----- Original Message -----
I was stumped for quite a while about why I couldn't get a docker build to
run on my VM. The symptom is that the docker build can not reach the outside
world, and therefore can't pull in what it needs. This happens even though
the VM itself has no connectivity issues. Note, I assume this is a VM thing
because it happened to both mazz and myself, using Virtual Box fedora vms,
but it may not be limited to VMs. I finally stumbled on a stack overflow
entry that solved the issue [1].
Basically, you need to tell docker about your DNS servers, and also Google's
DNS server 8.8.8.8. Your mileage may vary, perhaps you'll only need a subset
of of servers, but hopefully this helps you out, because it was a pita.
[1]
http://stackoverflow.com/questions/25130536/dockerfile-docker-build-cant-...
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participants (2)
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Jay Shaughnessy -
John Mazzitelli