CODEWITHSUNDEEP
network-programmingdockerip
Dominik Kukacka
Dominik Kukacka

Reputation: 567

Assign different IPs to different Docker container

I need to run two containers each containing a script binding on a specific (public) IP (11.11.11.22 and 11.11.11.23)

The docker host itself is on 10.10.10.222.

I have the subnet 11.11.11.20/27, my gateway is 11.11.11.21

If it matters my server is at SoftLayer.

docker-compose.yml

version: '2'
services:
  nginx-0:
    image: nginx:1.10
    ports:
      - 11.11.11.22:80:80
    networks:
      app_net:
        ipv4_address: 11.11.11.22

  nginx-1:
    image: nginx:1.10
    ports:
      - 11.11.11.23:80:80
    networks:
      app_net:
        ipv4_address: 11.11.11.23

networks:
  app_net:
    driver: bridge
    ipam:
      driver: default
      config:
      - subnet: 11.11.11.20/27
        gateway: 11.11.11.21

ip a

3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.222/27 brd 10.10.10.223 scope global eth1
       valid_lft forever preferred_lft forever
    inet 11.11.11.22/32 brd 11.11.11.22 scope global eth1:0
       valid_lft forever preferred_lft forever
    inet 11.11.11.23/32 brd 11.11.11.23 scope global eth1:1
       valid_lft forever preferred_lft forever

ips inside container docker exec nginx-0 ip a

6: eth0@if7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 11.11.11.22/27 scope global eth0
       valid_lft forever preferred_lft forever

If I curl the two IPs i get an "curl: (52) Empty reply from server"

Any other IP in my range will return "Failed to connect..."

Is there any solution to do this?

Thanks in advance! Dominik

Upvotes: 0

Views: 142

Answers (1)

Dominik Kukacka
Dominik Kukacka

Reputation: 567

I figured it out.

I had to remove the interface on the host.

ipconfig eth0:0 down
ipconfig eth0:1 down

I also removed it from the /etc/networking/interfaces

Upvotes: 1

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