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Weave Networking on Docker

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Docker Networking
with Weave
johann Romefort - co-founder @ getrainbow.com
Docker Networking
• Linux Bridge based
• Work as this:
• Creates a Virtual Eth Bridge on docker0
• Assign docker0 bridge an IP unused on host
• create a vethXXXX interface
• map vethXXXX to ethX on host
Docker networking
host1
Container1
docker0
vethXXX
eth0
eth0
Docker networking
host1
Container1
docker0
Container2
eth0
vethXXX
vethXXX
eth0eth0
Docker networking
host1
wordpress
docker0
mysql
eth0
Container Interconnection through docker0
That’s how container linking works:
exporting host information in local ENV
Container communicate
through open ports
$docker run -d
--name mysql
-e MYSQL_DATABASE=WORDPRESS
-e MYSQL_USER=wp
-e MYSQL_PASSWORD=huhu
orchardup/mysql
$docker run
--name wordpress
--link mysql:mysql -d
-e WORDPRESS_DB_USER=wp
-e WORDPRESS_DB_NAME=WORDPRESS
-e WORDPRESS_DB_PASSWORD=huhu
wordpress
vethXXX
vethXXX
eth0eth0
Docker networking
host1
wordpress mysql
eth0
Container exposing public port
docker0
$docker run -d
--name mysql
-e MYSQL_DATABASE=WORDPRESS
-e MYSQL_USER=wp
-e MYSQL_PASSWORD=huhu
orchardup/mysql
$docker run
--name wordpress
--link mysql:mysql -d
-e WORDPRESS_DB_USER=wp
-e WORDPRESS_DB_NAME=WORDPRESS
-e WORDPRESS_DB_PASSWORD=huhu
-p 80:80
wordpress
$sudo docker exec -it wordpress bash
:80
vethXXX
vethXXX
eth0eth0

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Weave Networking on Docker