networking - How do I find the network ip using docker and travis? -

in local setup, can run ...

docker run --name myapp -e host=$(docker-machine ip default) --user root myapp 

... , use $host connect other container (e.g. 1 running mongodb).

however, in travis, docker-machine not exist. thus, cannot put line in .travis.yml.

how network ip?

the flag --link adds entry /etc/hosts ip address of specified running container

docker run --name myapp --link mongodb:mongodb myapp 

however please note that:

the default docker0 bridge network supports use of port mapping , docker run --link allow communications between containers in docker0 network. these techniques cumbersome set , prone error. while still available techniques, better avoid them , define own bridge networks instead.

another option using flag --add-host if want add known ip address

docker run --name myapp --add-host mongodb:10.10.10.1 myapp 

option 2

create network

docker network create --subnet=172.18.0.0/16 mynet123 

run mongodb container assigning static ip

docker run --network mynet123 --ip 172.18.0.22 -d mongodb 

add ip other container

docker run --network mynet123 --add-host mongodb:172.18.0.22 -d myapp