Docker native network - None

Docker native network(What,How,Why)

None

Description: Disable network

1. How to use none network?

[root@localhost ~]# docker run --rm \

-dit --network none \

--name no-net-alpine \

alpine:latest \

ash

Explanation: run a command in a new container

parameters:

--rm: when the container exited, delete the container.

-d: run in dettach mode, run the container in background.

-i: keep STDIN open even it is not attached.

-t: Allocate a pseudo-TTY

--name: assign a name to the container

Chcker Images:

REPOSITORY TAG IMAGE ID CREATED SIZE

alpine latest 3fd9065eaf02 2 months ago 4.14MB

Check Container:

[root@localhost ~]# docker container ls

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

c199c40cac34 alpine:latest "ash" 15 minutes ago Up 15 minutes no-net-alpine

Check the network settings

docker inspect c199c40cac34

"Networks": {

"none": {

"IPAMConfig": null,

"Links": null,

"Aliases": null,

"NetworkID": "f80e6afec2c4e555bc11974ca3996780b8caaf00eed2551b4a89e0a461491d09",

"EndpointID": "16613fd17a4675b0bbe4042d6f27ca052d4b233e3c506cb3a454852b5a8921fc",

"Gateway": "",

"IPAddress": "",

"IPPrefixLen": 0,

"IPv6Gateway": "",

"GlobalIPv6Address": "",

"GlobalIPv6PrefixLen": 0,

"MacAddress": "",

"DriverOpts": null

}

Check the link status in container

[root@localhost ~]# docker exec no-net-alpine ip link show

1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

Check the route in container

[root@localhost ~]# docker exec no-net-alpine ip route

#it will show nothing, no route info for this container.

2. Usage of None network

Some application with analysis data, generate report and other batch tasks.