N. P. O'Donnell, 2020
List networks:
docker network ls
Create a network called beatles:
docker network create beatles
Create and start 4 alpine containers in beatles network:
NAME=john; docker run -dit --network beatles --network-alias $NAME --name $NAME --hostname $NAME alpine /bin/sh
NAME=paul; docker run -dit --network beatles --network-alias $NAME --name $NAME --hostname $NAME alpine /bin/sh
NAME=george; docker run -dit --network beatles --network-alias $NAME --name $NAME --hostname $NAME alpine /bin/sh
NAME=ringo; docker run -dit --network beatles --network-alias $NAME --name $NAME --hostname $NAME alpine /bin/sh
Inspect network:
docker network inspect beatles
Attach to john, check hostname, ping paul:
$ docker attach john
/ # hostname
john
/ # ping paul
PING paul (172.20.0.3): 56 data bytes
64 bytes from 172.20.0.3: seq=0 ttl=64 time=0.152 ms
64 bytes from 172.20.0.3: seq=1 ttl=64 time=0.178 ms
^C
--- paul ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.152/0.165/0.178 ms