Docker : Docker Network2017/04/08 |
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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 ad04ec5023ed bridge bridge local b286cf81a5f1 host host local 681a4b1d762a none null local 66ce864f00b6 root_default bridge local # display details of [bridge] [root@dlp ~]# docker network inspect bridge
[
{
"Name": "bridge",
"Id": "ad04ec5023edd53519fcd444a0a2dc401c4536ab2d02bb350e57f6e9b132740d",
"Created": "2021-05-24T12:49:06.10578464+09:00",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": null,
"Config": [
{
"Subnet": "172.17.0.0/16"
}
]
},
"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 centos /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 |
| [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 77474ec94a19fdf87642200fde8f74e4a16aa4e31127ee57f6f6538e8da892c0[root@dlp ~]# docker network ls NETWORK ID NAME DRIVER SCOPE ad04ec5023ed bridge bridge local b286cf81a5f1 host host local 77474ec94a19 network01 bridge local 681a4b1d762a none null local 66ce864f00b6 root_default bridge local # run a container with specifying [network01] [root@dlp ~]# docker run --net network01 centos /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 cdaad345a525 srv.world/centos-httpd "/usr/sbin/httpd -D …" 7 seconds ago Up 5 seconds 0.0.0.0:8081->80/tcp, :::8081->80/tcp admiring_sammet[root@dlp ~]# docker exec cdaad345a525 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 cdaad345a525
docker exec cdaad345a525 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 cdaad345a525 [root@dlp ~]# docker exec cdaad345a525 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 ad04ec5023ed bridge bridge local b286cf81a5f1 host host local 77474ec94a19 network01 bridge local 681a4b1d762a none null local 66ce864f00b6 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, not bridge, set like follows. |
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[root@dlp ~]# docker network ls NETWORK ID NAME DRIVER SCOPE ad04ec5023ed bridge bridge local b286cf81a5f1 host host local 681a4b1d762a none null local[root@dlp ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE srv.world/centos-httpd latest 7cf442f4e930 34 minutes ago 250MB srv.world/centos-nginx latest 6adb1438d24f 38 minutes ago 289MB mariadb latest 2a2c18b8e036 10 days ago 405MB registry 2 1fd8e1b0bb7e 5 weeks ago 26.2MB centos latest 300e315adb2f 5 months ago 209MB # run a container with [host] network [root@dlp ~]# docker run -d --net host srv.world/centos-httpd ad46dd88090c87dc4418a5044ec4dd722bff19bb9b56521815e8983a75733f97[root@dlp ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES ad46dd88090c srv.world/centos-httpd "/usr/sbin/httpd -D …" 6 seconds ago Up 4 seconds goofy_heisenberg # the port [httpd] service listens on container is used on Host network [root@dlp ~]# ss -napt
State Recv-Q Send-Q Local Address:Port Peer Address:Port
.....
.....
LISTEN 0 128 [::]:80 [::]:* users:(("httpd",pid=15204,fd=4),("httpd",pid=15203,fd=4),("httpd",pid=15202,fd=4),("httpd",pid=15186,fd=4))
[root@dlp ~]# curl localhost Index.html on Aapche httpd |
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