Docker Networking using Host network

Docker Networking using Host network

Host Network

描述：使用Docker host的网络作为container的网络。Docker容器使用namespace和cgroup技术，命名空间将会把资源（网络，存储，进程命名空间）进行隔离，使用这种方式，network将不会做隔离，直接使用host的网络。

How to use host network?

• 查看目前docker host中的网络

[root@localhost ~]# docker network ls

NETWORK ID NAME DRIVER SCOPE

2b65f9fa598b bridge bridge local

726cbc66240c host host local

f80e6afec2c4 none null local

• 运行一个容器使用host network

[root@localhost ~]# docker run --rm -dit --network host --name my_nginx nginx

Unable to find image 'nginx:latest' locally

latest: Pulling from library/nginx

2a72cbf407d6: Pull complete

eccc107d7abd: Pull complete

76aa3935d77c: Pull complete

Digest: sha256:f6e250eaa36af608af9ed1e4751f063f0ca0f5310b1a5d3ad9583047256f37f6

Status: Downloaded newer image for nginx:latest

9966b671587a12c53885898d0b1ff724aef8edec910055efa9f57042bb214ee6

• 查看主机的网络信息

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

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever

inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

2: ens9: mtu 1500 qdisc pfifo_fast state UP qlen 1000

link/ether 52:54:00:6b:cc:77 brd ff:ff:ff:ff:ff:ff

inet 192.168.122.206/24 brd 192.168.122.255 scope global dynamic ens9

valid_lft 3264sec preferred_lft 3264sec

inet6 fe80::a473:1249:7f61:f5ea/64 scope link

valid_lft forever preferred_lft forever

3: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000

link/ether 52:54:00:97:1d:2e brd ff:ff:ff:ff:ff:ff

inet 192.168.122.51/24 brd 192.168.122.255 scope global dynamic eth0

valid_lft 3179sec preferred_lft 3179sec

inet6 fe80::5054:ff:fe97:1d2e/64 scope link

valid_lft forever preferred_lft forever

4: docker0: mtu 1500 qdisc noqueue state DOWN

link/ether 02:42:fb:73:ee:25 brd ff:ff:ff:ff:ff:ff

inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0

valid_lft forever preferred_lft forever

[root@localhost ~]# netstat -pln|grep 80

tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 16413/nginx: master

[root@localhost ~]# ps -ef|grep 16413

root 16413 16398 0 03:39 pts/0 00:00:00 nginx: master process nginx -g daemon off;

101 16434 16413 0 03:39 pts/0 00:00:00 nginx: worker process

• 在主机上访问web

[root@localhost ~]# curl

Welcome to nginx!

If you see this page, the nginx web server is successfully installed and

working. Further configuration is required.

For online documentation and support please refer to

nginx.org.

Commercial support is available at

nginx.com.

Thank you for using nginx.

[root@localhost libvirt]# curl

Welcome to nginx!

If you see this page, the nginx web server is successfully installed and

working. Further configuration is required.

For online documentation and support please refer to

nginx.org.

Commercial support is available at

nginx.com.

Thank you for using nginx.