Docker : Docker Network2021/04/06 |
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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 cee9402908b9 bridge bridge local e7b1b2a15508 host host local 3696ca2c53b8 none null local df0619e46838 root_default bridge local # display details of [bridge] [root@dlp ~]# docker network inspect bridge
[
{
"Name": "bridge",
"Id": "cee9402908b9e314c3b37adba7898b54a8fe31b4a16d2585de74d5e38f2425c6",
"Created": "2021-04-06T00:53:09.912662064-06:00",
"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 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 bc813cd90c60e04035294d72d7c0e9ebd8d4cbec8cdaab019ca2f1c2e1b6c2a9[root@dlp ~]# docker network ls NETWORK ID NAME DRIVER SCOPE cee9402908b9 bridge bridge local e7b1b2a15508 host host local bc813cd90c60 network01 bridge local 3696ca2c53b8 none null local df0619e46838 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 f9465c672cdf srv.world/centos-httpd "/usr/sbin/httpd -D …" 10 seconds ago Up 9 seconds 0.0.0.0:8081->80/tcp silly_lamarr[root@dlp ~]# docker exec f9465c672cdf 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 f9465c672cdf
docker exec f9465c672cdf 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 f9465c672cdf [root@dlp ~]# docker exec f9465c672cdf 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 cee9402908b9 bridge bridge local e7b1b2a15508 host host local bc813cd90c60 network01 bridge local 3696ca2c53b8 none null local df0619e46838 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 cee9402908b9 bridge bridge local e7b1b2a15508 host host local 3696ca2c53b8 none null local[root@dlp ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE srv.world/centos-httpd latest 83fe1ffbabdb About an hour ago 250MB srv.world/centos-nginx latest ae7ab6688f5e About an hour ago 289MB mariadb latest e76a4b2ed1b4 3 days ago 401MB registry 2 ee34aa9d8ab2 4 days ago 26.2MB centos latest 300e315adb2f 3 months ago 209MB # run a container with [host] network [root@dlp ~]# docker run -d --net host srv.world/centos-httpd 93722bef91e7db60219fbac1e551e987b33b863bb2157ab9676df995dbaff684[root@dlp ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 93722bef91e7 srv.world/centos-httpd "/usr/sbin/httpd -D …" 6 seconds ago Up 5 seconds bold_pare # 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=12673,fd=4),("httpd",pid=12669,fd=4),("httpd",pid=12668,fd=4),("httpd",pid=12651,fd=4))
[root@dlp ~]# curl localhost Index.html on Aapche httpd |
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