Holocron: Docker Host network

domingo, 7 de julio de 2019

Docker Host network

Docker Host Network es la modalidad de red donde el contenedor se fusiona con la red del host, pero almacenamiento, process namespace y username space están aislados del host.

El contenedor se removerá automaticamente al detenerse y correra en background.

bext@bext-VPCF13WFX:~$ docker run --rm -d --network host --name my_nginx nginx
b89afa6c2915f41c9a53b3585d4fed8f63d9b3841d81fd90d354a06eadb5d3d0

bext@bext-VPCF13WFX:~$ ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: enp4s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether 78:84:3c:cc:07:0c brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 4c:0f:6e:f8:ba:40 brd ff:ff:ff:ff:ff:ff
    inet 10.143.113.239/8 brd 10.255.255.255 scope global dynamic noprefixroute wlp2s0
       valid_lft 79126sec preferred_lft 79126sec
    inet6 fe80::a463:87c:85cb:d377/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
4: docker_gwbridge: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:1c:26:76:ce brd ff:ff:ff:ff:ff:ff
    inet 172.18.0.1/16 brd 172.18.255.255 scope global docker_gwbridge
       valid_lft forever preferred_lft forever
    inet6 fe80::42:1cff:fe26:76ce/64 scope link 
       valid_lft forever preferred_lft forever
5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:a0:ac:f7:f5 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
    inet6 fe80::42:a0ff:feac:f7f5/64 scope link 
       valid_lft forever preferred_lft forever
12: vetha135868@if11: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker_gwbridge state UP group default 
    link/ether 3a:bd:92:ba:38:5a brd ff:ff:ff:ff:ff:ff link-netnsid 1
    inet6 fe80::38bd:92ff:feba:385a/64 scope link 
       valid_lft forever preferred_lft forever
bext@bext-VPCF13WFX:~$ sudo netstat -tulpn | grep 80
[sudo] password for bext: 
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      9772/nginx: master

Vemos que el servidor nginx esta usando el puerto 80 del host.

bext@bext-VPCF13WFX:~$ curl http://localhost
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }

...

Detenemos el contenedor y automaticamente se eliminará.

bext@bext-VPCF13WFX:~$ docker container stop my_nginx
my_nginx

eot

Holocron

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domingo, 7 de julio de 2019

Docker Host network

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