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bhargavirengarajan21
bhargavirengarajan21

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Docker network Commands (Docker Series - IV)

#docker #devops #webdev #beginners

Some network commands:

$ sudo docker network create --driver bridge my-bridge 3973cea88d3f345c60ade7414dee4ff0a09f2863d667e713acef61dcf4badfa6
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The above code is to create a network of type bridge with default Ip address.

$ sudo docker network create --driver bridge --subnet=192.168.0.0/16 --ip-range=192.168.5.0/24 my-bridge-1 eb05210ca8a0c722684271373dbdb7ea2da57dd82754324c59ffac363be22cd0
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The above code is to create bridge network with specified ip range and subnet

$ sudo docker network ls NETWORK ID NAME DRIVER SCOPE a2884fc4f337 bridge bridge local 6bffa8afea2f host host local 3973cea88d3f my-bridge bridge local eb05210ca8a0 my-bridge-1 bridge local 4278b3734e55 none null local
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apart from created network , docker provides us 3 network, host, bridge, and none is a special case where its completely isolated and lack of connnectivity.

$ sudo docker network ls --filter driver=bridge NETWORK ID NAME DRIVER SCOPE a2884fc4f337 bridge bridge local 3973cea88d3f my-bridge bridge local eb05210ca8a0 my-bridge-1 bridge local
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the above code helps to filter the network which has driver as bridge.

Connect Network: 

$ sudo docker network connect my-bridge-1 flamboyant_wing
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In the above code the we have established a bridge connection to running container. This wont return any id, to check we need to do
{% embed $ sudo docker inspect %} flamboyant_wing(container name)

result
Image description

Connect using network flag in run command:

$ sudo docker container run -itd --network host --name cont_ngnix nginx:latest 9227518678e384232b6e34f31674e5618f17851d0f49a317c33294faecec06e5
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Here we provided the host network. when we try to find the port
sudo docker container port cont_ngnix
it returns nothing, since there is no port mapping as it's uses host ip address. instead try hitting the localhost 80 port which is host port.

Result on $ sudo docker inspect cont_ngnix

Image description

Inspect Network 

 $ sudo docker network inspect my-bridge-1 [ { "Name": "my-bridge-1", "Id": "eb05210ca8a0c722684271373dbdb7ea2da57dd82754324c59ffac363be22cd0", "Created": "2022-08-15T21:57:03.886178549+05:30", "Scope": "local", "Driver": "bridge", "EnableIPv6": false, **"IPAM": { "Driver": "default", "Options": {}, "Config": [ { "Subnet": "192.168.0.0/16", "IPRange": "192.168.5.0/24", "Gateway": "192.168.5.0" } ] },** "Internal": false, "Attachable": false, "Ingress": false, "ConfigFrom": { "Network": "" }, "ConfigOnly": false, ** "Containers": {},** "Options": {}, "Labels": {} } ]
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the above command inspect user created network displays the related details.

format inspected details:

$sudo docker network inspect --format "{{.Scope}}" bridge
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the above command helps to list the scope of bridge network

$sudo docker network inspect --format "{{.Id}}:{{.Name}}" bridge f46032790f9dcb26f99afec265b1eea44fc96563836a85316c4346f36aa2c6fe:bridge
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this command list the id and name of the bridge network

Disconnect Network 

$sudo docker network disconnect my-bridge-1 flamboyant_wing
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