Docker : Docker Network2022/09/08 |
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This is the basic usage to configure Docker Network.
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| [1] | When running containers without specifying network, default [bridge] network is assigned. |
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# display network list root@dlp:~# docker network ls NETWORK ID NAME DRIVER SCOPE c6827e510929 bridge bridge local 0a92932bfe22 host host local ee71731d3229 none null local 0e12d0d715f2 root_default bridge local # display details of [bridge] root@dlp:~# docker network inspect bridge
[
{
"Name": "bridge",
"Id": "c6827e510929a2c9cd6c3ca8337488607a4055f01e8ac18ea067baf8ae1ce88f",
"Created": "2022-09-08T01:31:28.575826114Z",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": null,
"Config": [
{
"Subnet": "172.17.0.0/16",
"Gateway": "172.17.0.1"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {},
"Options": {
"com.docker.network.bridge.default_bridge": "true",
"com.docker.network.bridge.enable_icc": "true",
"com.docker.network.bridge.enable_ip_masquerade": "true",
"com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
"com.docker.network.bridge.name": "docker0",
"com.docker.network.driver.mtu": "1500"
},
"Labels": {}
}
]
# [bridge] is assigned as container network by default root@dlp:~# docker run ubuntu /bin/bash -c "apt-get update; apt-get -y install iproute2; /usr/sbin/ip route" ..... ..... default via 172.17.0.1 dev eth0 172.17.0.0/16 dev eth0 proto kernel scope link src 172.17.0.2root@dlp:~# docker ps -a | head -2 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 1c4d8a95eade ubuntu "/bin/bash -c 'apt-g…" About a minute ago Exited (0) About a minute ago stoic_coldenroot@dlp:~# docker commit 1c4d8a95eade srv.world/ubuntu-iproute |
| [2] | If you'd like to assign another network, set like follows. |
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# create network [network01] with [192.168.100.0/24] subnet root@dlp:~# docker network create --subnet 192.168.100.0/24 network01 b1c995fda78a54c2ff2bb0ec441fd5a992d2bc3b370a3b61a82233eb06cc4252root@dlp:~# docker network ls NETWORK ID NAME DRIVER SCOPE c6827e510929 bridge bridge local 0a92932bfe22 host host local b1c995fda78a network01 bridge local ee71731d3229 none null local 0e12d0d715f2 root_default bridge local # run a container with specifying [network01] root@dlp:~# docker run --net network01 srv.world/ubuntu-iproute /usr/sbin/ip route default via 192.168.100.1 dev eth0 192.168.100.0/24 dev eth0 proto kernel scope link src 192.168.100.2 # to attach the network to existing running container, set like follows root@dlp:~# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 679b88eb61d1 srv.world/ubuntu-nginx "/usr/sbin/nginx -g …" 3 seconds ago Up 2 seconds 0.0.0.0:8081->80/tcp, :::8081->80/tcp dazzling_mayerroot@dlp:~# docker exec 679b88eb61d1 /usr/sbin/ip route default via 172.17.0.1 dev eth0 172.17.0.0/16 dev eth0 proto kernel scope link src 172.17.0.2 # attach network to specify an IP address in the subnet root@dlp:~# docker network connect --ip 192.168.100.10 network01 679b88eb61d1
docker exec 679b88eb61d1 /usr/sbin/ip route default via 172.17.0.1 dev eth0 172.17.0.0/16 dev eth0 proto kernel scope link src 172.17.0.2 192.168.100.0/24 dev eth1 proto kernel scope link src 192.168.100.10 # to disconnect the network, set like follows root@dlp:~# docker network disconnect network01 679b88eb61d1 root@dlp:~# docker exec 679b88eb61d1 /usr/sbin/ip route default via 172.17.0.1 dev eth0 172.17.0.0/16 dev eth0 proto kernel scope link src 172.17.0.2 |
| [3] | To remove docker networks, set like follows. |
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root@dlp:~# docker network ls NETWORK ID NAME DRIVER SCOPE c6827e510929 bridge bridge local 0a92932bfe22 host host local b1c995fda78a network01 bridge local ee71731d3229 none null local 0e12d0d715f2 root_default bridge local # remove [network01] root@dlp:~# docker network rm network01 network01 # remove networks which containers don't use at all root@dlp:~# docker network prune
WARNING! This will remove all custom networks not used by at least one container.
Are you sure you want to continue? [y/N] y
Deleted Networks:
root_default
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| [4] | To connect to Host network, set like follows. |
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root@dlp:~# docker network ls NETWORK ID NAME DRIVER SCOPE c6827e510929 bridge bridge local 0a92932bfe22 host host local ee71731d3229 none null localroot@dlp:~# docker images REPOSITORY TAG IMAGE ID CREATED SIZE srv.world/ubuntu-iproute latest ddf1e2b3acd2 6 minutes ago 119MB srv.world/ubuntu-apache2 latest b7891f747bd5 18 hours ago 227MB srv.world/ubuntu-nginx latest 51f5190bb9d9 18 hours ago 170MB dlp.srv.world:5000/ubuntu my-registry 2dc39ba059dc 6 days ago 77.8MB ubuntu latest 2dc39ba059dc 6 days ago 77.8MB # run a container with [host] network root@dlp:~# docker run -d --net host srv.world/ubuntu-apache2 57c36cdc7633310526f549ea3040ecb388c201a9313436580ae83684ebe67058root@dlp:~# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 57c36cdc7633 srv.world/ubuntu-apache2 "/usr/sbin/apachectl…" 50 seconds ago Up 49 seconds sad_vaughan # the port [apache2] service listens on container is used on Host network root@dlp:~# ss -napt
State Recv-Q Send-Q Local Address:Port Peer Address:Port
.....
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LISTEN 0 511 *:80 *:* users:(("apache2",pid=2959,fd=4),("apache2",pid=2958,fd=4),("apache2",pid=2957,fd=4))
root@dlp:~# curl localhost index.html on Aapche2 |
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