get docker interface code example

Example 1: interface docker

# docker network create --driver bridge blue
1196a4c5af43a21ae38ef34515b6af19236a3fc48122cf585e3f3054d509679b

# docker network inspect blue

[
    {
        "Name": "blue",
        "Id": "1196a4c5af43a21ae38ef34515b6af19236a3fc48122cf585e3f3054d509679b",
        "Scope": "local",
        "Driver": "bridge",
        "IPAM": {
            "Driver": "default",
            "Config": [
                {
                    "Subnet": "172.18.0.0/16",
                    "Gateway": "172.18.0.1/16"
                }
            ]
        },
        "Containers": {},
        "Options": {},
        "Labels": {}
    }
]

# docker run -it --name blue1 --network blue debian /bin/bash

# docker run -it --name blue2 --network blue debian /bin/bash

# docker network inspect blue 
[
    {
        "Name": "blue",
        "Id": "2c601356b5d51f3044518bca70c5bc016b2e0a0ccb28475a098185d831c4f27c",
        "Created": "2017-06-07T12:50:24.911280255+02:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.18.0.0/16",
                    "Gateway": "172.18.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Containers": {
            "1d105c8c8ab5e84c5cc0e7fac6c57946acc3501c2e9ac202d4a1709a3ab6bd26": {
                "Name": "blue1",
                "EndpointID": "47d0c1a4041b76123ccfa16a94a2a4211b56c1255c52d670091b8dedcf15241c",
                "MacAddress": "02:42:ac:12:00:02",
                "IPv4Address": "172.18.0.2/16",
                "IPv6Address": ""
            },
            "feb6d086c7813c621218bed5bda2436cc039c7e30f88e04b39ec669bd95f530c": {
                "Name": "blue2",
                "EndpointID": "cf2c8d36398b0b73920c522efaa3f4c22aa81e02053d882998b3d9d271fe4f11",
                "MacAddress": "02:42:ac:12:00:03",
                "IPv4Address": "172.18.0.3/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

# docker attach blue2
root@1d105c8c8ab5:/#
root@feb6d086c781:/# apt-get install dnsutils

root@feb6d086c781:/# dig

; <<>> DiG 9.9.5-9+deb8u11-Debian <<>>
;; global options: +cmd
......
.            119855    IN    NS    k.root-servers.net.
.            119855    IN    NS    l.root-servers.net.
.            119855    IN    NS    m.root-servers.net.

;; Query time: 64 msec
;; SERVER: 127.0.0.11#53(127.0.0.11)
;; WHEN: Thu Jun 08 08:02:44 UTC 2017
;; MSG SIZE  rcvd: 239


dig blue1

; <<>> DiG 9.9.5-9+deb8u11-Debian <<>> blue1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63460
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;blue1.                IN    A

;; ANSWER SECTION:
blue1.            600    IN    A    172.18.0.2

;; Query time: 0 msec
;; SERVER: 127.0.0.11#53(127.0.0.11)
;; WHEN: Thu Jun 08 08:03:21 UTC 2017
;; MSG SIZE  rcvd: 44

root@feb6d086c781:/# cat /etc/resolv.conf 
nameserver 127.0.0.11
options ndots:0

Example 2: interface docker

# brctl show
br-2c601356b5d5        8000.0242b41afdcb    no        vetha2743d6
docker0                8000.0242fbdce780    no        veth46fbe31

Example 3: interface docker

# docker network inspect bridge

{[
    {
        "Name": "bridge",
        "Id": "f7ab26d71dbd6f557852c7156ae0574bbf62c42f539b50c8ebde0f728a253b6f",
        "Scope": "local",
        "Driver": "bridge",
        "IPAM": {
            "Driver": "default",
            "Config": [
                {
                    "Subnet": "172.17.0.1/16",
                    "Gateway": "172.17.0.1"
                }
            ]
        },
        "Containers": {
            "3386a527aa08b37ea9232cbcace2d2458d49f44bb05a6b775fba7ddd40d8f92c": {
                "EndpointID": "647c12443e91faf0fd508b6edfe59c30b642abb60dfab890b4bdccee38750bc1",
                "MacAddress": "02:42:ac:11:00:02",
                "IPv4Address": "172.17.0.2/16",
                "IPv6Address": ""
            },
            "94447ca479852d29aeddca75c28f7104df3c3196d7b6d83061879e339946805c": {
                "EndpointID": "b047d090f446ac49747d3c37d63e4307be745876db7f0ceef7b311cbba615f48",
                "MacAddress": "02:42:ac:11:00:03",
                "IPv4Address": "172.17.0.3/16",
                "IPv6Address": ""
            }
        },
        "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": "9001"
        },
        "Labels": {}
    }
]