Shulou(Shulou.com)06/02 Report--

Create a container without network configuration

[root@localhost] # docker run-I-t-- rm-- net=none alpine sh/ #

Open another terminal

View Container id

[root@localhost] # docker ps-a

Find process id

[root@localhost ~] # docker inspect-f'{{.State.Pid}} '2aefc41dbdeb 9076 [root@localhost ~] # pid=9076

Create a namespace

[root@localhost ~] # mkdir-p / var/run/netns [root@localhost ~] # ln-s / proc/$pid/ns/net / var/run/netns/$pid

View the IP and subnet mask information of the bridged Nic

[root@localhost ~] # ip addr show docker05: docker0: mtu 1500 qdisc noqueue state DOWN link/ether 02:42:8e:e7:64:4a brd ff:ff:ff:ff:ff:ff inet 172.18.0.1 scope global docker0 valid_lft forever preferred_lft forever 16 brd 172.18.255.255 scope global docker0 valid_lft forever preferred_lft forever

Create a pair of "veth pair" interfaces An and B

[root@localhost ~] # sudo ip link add A type veth peer name B

Bind interface A to bridge docker0

[root@localhost ~] # sudo brctl addif docker0 A

And enable it.

[root@localhost ~] # sudo ip link set A up

Put interface B into the network namespace of the container

[root@localhost ~] # sudo ip link set B netns $pid

Named eth0

[root@localhost ~] # sudo ip netns exec $pid ip link set dev B name eth0

Turn on network interface B

[root@localhost ~] # sudo ip netns exec $pid ip link set eth0 up

Configure an available IP (bridged segment)

[root@localhost ~] # sudo ip netns exec $pid ip addr add 172.18.0.99 16 dev eth0

Configure the default gateway

[root@localhost ~] # sudo ip netns exec $pid ip route add default via 172.18.0.1

Finally, go back to the container to check the network card configuration.

/ # ip a1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever18: eth0@if19: mtu 1500 qdisc noqueue state UP qlen 1000 link/ether 6e:b9:75:8e:f4:99 brd ff:ff:ff:ff:ff:ff inet 172.18.0.99/ 16 scope global eth0 valid_lft forever preferred_lft forever/ # ping baidu.comPING baidu.com (123.125.114.144): 56 data bytes64 bytes from 123.125.114.144: seq=0 ttl=53 time=2.827 ms64 bytes from 123.125.114.144: seq=1 ttl=53 time=2.900 Ms ^ C-baidu.com ping statistics-2 packets transmitted 2 packets received, 0% packet lossround-trip min/avg/max = 2.827 ms 2.863 ms

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