network, bridge, host, none

• docker network ls

docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
290558d808c0   bridge    bridge    local
3ee744dfe053   host      host      local
b9d8dd48b0e2   none      null      local

Representative network drivers which can be connected external are bridge, host, none, container.

 

1. bridge : It already setup to utilize docker0, it(bridge network) allocates 172.17.0.x in order to container. It is user defined network, so it needs to be created.

 

• docker network inspect bridge

docker network inspect bridge
[
    {
        "Name": "bridge",

...

     "Config": [
                {
                    "Subnet": "172.17.0.0/16",
                    "Gateway": "172.17.0.1"
                }
            ]
        },

...

 

• docker network create --driver bridge mybridge

Let's create new network bridge driver.

docker network create --driver bridge mybridge
c65049fd0e78b8f6250e06fa559cbf3a9e4f340d70169c4436a8856a5dcb625d

--driver : Bridge Driver, create 

 

• docker run -i -t --name mynetwork_container --net mybridge ubuntu:14.04

Let's setup to use mybridge network after generate container.

Internal IP(inet addr:172.18.0.2) has been allocated.

docker run -i -t --name mynetwork_container --net mybridge ubuntu:14.04

...

root@3c532989089b:/# ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:ac:12:00:02  
          inet addr:172.18.0.2  Bcast:172.18.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1312 (1.3 KB)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

--net : Network, create network

 

• docker network disconnect mybridge mynetwork_container

Let's disconnect bridge network(mybridge) from container(mynetwork_container).

 

• docker network connect mybridge mynetwork_container

Let'sconnect bridge network(mybridge) to container(mynetwork_container).

 

2. host : It can be used host network when network is setup as host.

 

• docker run -i -t --name network_host --net host ubuntu:14.04

If you use the host network mode for a container, the container does not get its own IP-address allocated. For instance, if you run a container which binds to port 80 and you use host networking, the container's application is available on port 80 on the host's IP addre

docker run -i -t --name network_host --net host ubuntu:14.04
root@docker-desktop:/# echo "inside the container"
inside the container
root@docker-desktop:/# ifconfig
br-c65049fd0e78 Link encap:Ethernet  HWaddr 02:42:cc:74:03:07  
          inet addr:172.18.0.1  Bcast:172.18.255.255  Mask:255.255.0.0
          inet6 addr: fe80::42:ccff:fe74:307/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:626 (626.0 B)

docker0   Link encap:Ethernet  HWaddr 02:42:da:64:36:c3  
          inet addr:172.17.0.1  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

eth0      Link encap:Ethernet  HWaddr 02:50:00:00:00:01  
          inet addr:192.168.65.3  Bcast:192.168.65.255  Mask:255.255.255.0
          inet6 addr: fe80::50:ff:fe00:1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4593 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4608 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:423774 (423.7 KB)  TX bytes:372824 (372.8 KB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:52 errors:0 dropped:0 overruns:0 frame:0
          TX packets:52 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:4392 (4.3 KB)  TX bytes:4392 (4.3 KB)

vethb2fdb53 Link encap:Ethernet  HWaddr ce:13:e2:22:77:38  
          inet6 addr: fe80::cc13:e2ff:fe22:7738/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:1116 (1.1 KB)

 

3. none : I don't want to use any network. It cuts off from external. 

 

• docker run -i -t --name network_none --net none ubuntu:14.04

Notice that no eth0 was created.

docker run -i -t --name network_none --net none ubuntu:14.04
root@dc8ca116692c:/# ifconfig
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)