WHAT IS MY DOCKER IP HOW TO
How to use external DNS in container while starting it All stopped containers will be updated immediately after the host’s file changes. So to pick up changes you need to stop and start the container again. Docker daemon takes help from the file change notifier and makes necessary changes in the container’s resolve file when there are changes made in the host’s file! The only catch is these changes will be done only if the container is not running. During this filtering, if no nameserver left to add in container’s /etc/nf the file then Docker daemon smartly adds Google’s public nameservers 8.8.8.8 and 8.8.4.4 in to file and use it within the container.Īlso, host and container /etc/nf always be in sync.
That’s pretty obvious since that won’t be reachable from container network so no point in keeping them. While copying it filter’s out all localhost IP addresses from the file. When you run a new container on the docker host without any DNS related option in command, it simply copies host’s /etc/nf into container. DNS nameservers in Dockerĭocker is coded in a smart way.
So it is always advisable to use user-customized networks rather than using default docker networks. link is a legacy feature and may be removed in upcoming features. You can add container inter-comm just by using -link option while running container (when on default bridge network) PING nginx1 (172.19.0.4) 56(84) bytes of data.Ħ4 bytes from nginx1.kerneltalks (172.19.0.4): icmp_seq=1 ttl=64 time=0.088 msĦ4 bytes from nginx1.kerneltalks (172.19.0.4): icmp_seq=2 ttl=64 time=0.054 msīut in default docker bridge network (which installs with docker daemon) automatic DNS resolution is disabled to maintain container isolation.