[docker] 도커 네트워크(bridge)를 생성하는 예시

맥북에서 도커 네트워크(brider)를 생성하는 예시이다. 

$ docker network create --driver=bridge mynet

1e322c39b6415e3d6b76bee009e8282d6e9e738e9b35930abc875c1cf20578fa

$ docker network ls | grep mynet

1e322c39b641        mynet                           bridge              local

정상적으로 드라이버가 생겼는지 확인한다.

$ ifconfig

(리눅스에서는 ip addr | grep br-)

bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500

options=63<RXCSUM,TXCSUM,TSO4,TSO6>

ether 4a:00:24:80:b7:01

Configuration:

id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0

maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200

root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0

ipfilter disabled flags 0x2

member: en1 flags=3<LEARNING,DISCOVER>

        ifmaxaddr 0 port 13 priority 0 path cost 0

member: en2 flags=3<LEARNING,DISCOVER>

        ifmaxaddr 0 port 14 priority 0 path cost 0

member: en3 flags=3<LEARNING,DISCOVER>

        ifmaxaddr 0 port 15 priority 0 path cost 0

member: en4 flags=3<LEARNING,DISCOVER>

        ifmaxaddr 0 port 16 priority 0 path cost 0

nd6 options=201<PERFORMNUD,DAD>

media: <unknown type>

status: inactive

생성된 네트워크(bridge)를 사용하는 컨테이너를 실행한다.

$ docker run -it -d --name container1 --net=mynet ubuntu:16.04 bash  

두 번 커맨드를 사용해 생성된 네트워크(bridge)를 사용할 수 있다.

$ docker run -it -d --name container2 ubuntu:16.04 bash           

$ docker network connect mynet container2

내부 ip를 확인해본다.

$  docker exec container1 ip addr

20: eth0@if21: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default

    link/ether 02:42:ac:19:00:02 brd ff:ff:ff:ff:ff:ff

    inet 172.25.0.2/16 brd 172.25.255.255 scope global eth0

       valid_lft forever preferred_lft forever

       

$  docker exec container2 ip addr 

(비슷하게 나온다)