How can configure or change eth1 to eth0 on Docker Container - linux

Question

I have installed docker on centos 7 server. I have created a custom bridge and attached a docker container. Now I have two ethernet connections when I execute ifconfig command with:
local network on eth0 and
one which is custom network on eth1.
I want to set custom network on eth0 and local network on eth1. I tried but weren't able to do so into docker container. Please help.
I am awaiting for your prompt reply.
Thanks in advance

Answer 1

How can I configure or change...
You can't. Better think of it this way: your container is just a process. Kill it and spin up a new one with the correct configuration.
An idea / example:
create your custom bridge:
$ docker network create test_net
c5e92fff4e386bab692f849d148509cdb9ae0e70307e0bf8426e62352c56368d
and at the execution of docker run attach your container to this bridge (172.18.0.X):
$ docker run -it --network=test_net alpine
...
then, connect the container to the default bridge (172.17.0.X)
$ docker network connect bridge <your_container_name>
Let's see what we've got:
$ docker container exec -it <your_container_name> sh
/ # ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:AC:12:00:02
inet addr:172.18.0.2 Bcast:172.18.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:54 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:6950 (6.7 KiB) TX bytes:0 (0.0 B)
eth1 Link encap:Ethernet HWaddr 02:42:AC:11:00:02
inet addr:172.17.0.2 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:50 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:6558 (6.4 KiB) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)