When I remove the container and create another then the docker correctly skip the bridge IP. Problem is that this container get IP 192.168.1.1 which is already assigned. A run first docker container like docker run -it -name test ubuntu /bin/bash. In /etc/default/docker I set DOCKER_OPTS="-b bridge0" i also try DOCKER_OPTS="-b=bridge0" or DOCKER_OPTS="-bridge=bridge0".Īfter this I restart the docker daemon.
DOCKER NETWORK HOST BRIDGE MANUAL
VM which is running ubuntu and is a docker host has IP 192.168.1.2/24 this IP I assign to manual created bridge0. I have VM running ubuntu 14.04 which is in network subnet 192.168.1.0/24. Hello, I have the same problem from docker 1.6 up. But, if there is anything that Docker can improve in docs or implementation, we're all ears to try and make things better within feasibility and time constraints, of course :) Allowing users to configure things exactly as they want means users also have the power to shoot themselves in the foot at times. Given there is nothing in the docs that would recommend such a configuration (and the docs clearly state it will use the CIDR of the bridge as the address range for container IP assignment), what changes would you recommend to Docker to help you and others who may try what you tried in the future? It should be clear that Docker did not do this on its own, and instead will use private address ranges that do not overlap with any other address ranges that it can find on the system. That's an interesting configuration, but as you can understand, bridging the same exact interface in two different daemons will result in both thinking they are operating on the network CIDR of the bridge interface, which probably in your case meant they both assumed they were handed the network range associated with eth0 that you bridged to. Reply to this email directly or view it on GitHub The flags being passed to your docker daemon invocation (if youĭon't know, you can ps axww | grep docker and it should show you the.Output of your bridge configuration as it is now (ip -4 addr show.We can look into the problem further and figure out if there is a bug in
If you didn't do that, could you please provide the following details so Which allowed it to hand out IPs from your specified CIDR. The only way I see Docker doing this "on purpose", is if you created theīridge yourself before starting Docker and already gave it an IP address Uses netlink to list all routes (see the first column of ip route) andĬhecks nameservers for network overlap as well.
In the "range addrs" loop I linked to above. You can check this codeĪlso in that file are a long list of private networks that it will attempt In any current routes on any interface on the host. Very hard to pick an IP address range for the containers which is not found Mode which the container use the same ip block with host"? Docker tries 22:42 GMT+08:00 Phil Estes you help us by explaining a bit more what you mean by: " with bridge
DOCKER NETWORK HOST BRIDGE CODE
The checking code actually uses netlink to list all routes (see the first column of ip route) and checks nameservers for network overlap as well. You can check this code for yourself in Īlso in that file are a long list of private networks that it will attempt in the " range addrs" loop I linked to above. Can you help us by explaining a bit more what you mean by: " with bridge mode which the container use the same ip block with host"? Docker tries very hard to pick an IP address range for the containers which is not found in any current routes on any interface on the host.
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