linux - Docker DNS settings -


i try create docker container custom network , dos settings.

docker network create --driver=bridge --opt "com.docker.network.bridge.enable_ip_masquerade"="true" --opt "com.docker.network.bridge.enable_icc"="true" --opt="com.docker.network.driver.mtu"="1500" --opt="com.docker.network.bridge.host_binding_ipv4"="0.0.0.0" net

--

docker run --dns 10.0.0.2 --network=net busybox cat /etc/resolv.conf

nameserver 127.0.0.11 options ndots:0

else if use standard network work fine

docker run --dns 10.0.0.2 --network=bridge busybox cat /etc/resolv.conf

nameserver 10.0.0.2

as of docker 1.10, dns managed differently user-defined networks. dns default bridge network unchanged backwards compatibility. in user-defined network, docker daemon uses embedded dns server. according documentation found here:

https://docs.docker.com/engine/userguide/networking/configure-dns/

--dns=[ip_address...]   ip addresses passed via --dns option used embedded                          dns server forward dns query if embedded dns server unable                         resolve name resolution request containers. these                          --dns ip addresses managed embedded dns server , not                         updated in container’s /etc/resolv.conf file.

so, dns nameserver used, not visible in container's /etc/resolv.conf.


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