is possible to link a DNS name to another DNS name in docker?
I’m kind of new on docker. I want to resolve DNS name into something define by the user. I mean, I have a service in docker which requires another service located in ‘myEndpoint’. I want to configure that when the service asked to ‘myEndpoint’ returns an IP/FQN I decide, either in the containers or outside.
How I can do this?
One Solution collect form web for “is possible to link a DNS name to another DNS name in docker?”
If you just want to map
myEndpoing to a specific IP, you could use option
docker run ... your container. Take a look at the following example:
~/ docker run --add-host=myEndpoint:126.96.36.199 --rm alpine:3.3 ping myEndpoint -c 4 PING myEndpoint (188.8.131.52): 56 data bytes 64 bytes from 184.108.40.206: seq=0 ttl=37 time=0.522 ms 64 bytes from 220.127.116.11: seq=1 ttl=37 time=0.391 ms 64 bytes from 18.104.22.168: seq=2 ttl=37 time=2.161 ms 64 bytes from 22.214.171.124: seq=3 ttl=37 time=0.488 ms --- myEndpoint ping statistics --- 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 0.391/0.890/2.161 ms
You can refer to the docs of docker run for more details.
But if you want to map
myEndpoint to other domain name, I think you need to use a FQDN and configure it as a CNAME DNS record, then configure DNS server for your container with option
--dns options when you do
docker run .... Hope this could be helpful 🙂