[lxc, network, bridge] How to setup IP addresses from your LAN using a bridge to your LXD Containers (DHCP)

How to setup IP addresses from your LAN using a bridge to your LXD Containers (DHCP)

井民全, Jing, mqjing@gmail.com

This document shows you how to assign your LXD containers IP address from your host LAN using a bridge. Whole knowledge was from the Simos Xenitellis blog page[2].

Table of contents

1. Quick 1

2. Procedure 2

2.1. Create a new bridge and Interface to the host 3

2.2. Obtain the IP 3

2.2.1. Setup the brigade IP from DHCP 3

2.2.2. Setup a static IP to your bridge 4

2.3. Use the Bridge 5

2.3.1. Create a new profile for bridge networking 5

2.3.2. List profile 6

2.3.3. Launch a container and use the bridge profile 7

3. References 8

1. Quick

# create a new bridge sudo nmcli con add ifname br0 type bridge con-name br0    # create a bridge br0 # add a interface to ens33 nic sudo nmcli con add type bridge-slave ifname ens33 master br0  # add a  interface to nic nmcli connection show # enable the bridge sudo nmcli con up br0 ip a s br0   # verification # use the bridge # Step 1:  create a profile, called bridge-profile lxc profile create bridge-profile    cat <<EOF | lxc profile edit bridge-profile description: Bridged networking LXD profile devices:   eth0:     name: eth0     nictype: bridged     parent: br0     type: nic EOF #Check lxc profile list # Step 2: Launch the container lxc launch ubuntu:20.04 c3 --profile default --profile bridge-profile #Verify lxc exec c3 -- /bin/bash ping www.google.com

2. Procedure

2.1. Create a new bridge and Interface to the host

Step 1: Create a bridge called br0 

sudo nmcli con add ifname br0 type bridge con-name br0    # create a bridge br0

Step 2: Add an interface to the host nic ens33

sudo nmcli con add type bridge-slave ifname ens33 master br0  # add a br0  interface to nic

e. g.

nmcli connection show

2.2. Obtain the IP

2.2.1. Setup the brigade IP from DHCP

Setup a DHCP based IP for your bridge

sudo nmcli con up br0 ip a s br0

If you do not see the ip that assigned to the br0, try to renew the ip

sudo dhclient -r br0; sudo dhclient br0 Or  systemctl restart networking.service Or Reboot the VM.

2.2.2. Setup a static IP to your bridge

sudo nmcli connection modify br0 ipv4.addresses '192.168.1.202/24' sudo nmcli connection modify br0 ipv4.gateway '192.168.1.1' sudo nmcli connection modify br0 ipv4.dns '8.8.8.8' sudo nmcli connection modify br0 ipv4.method manual sudo nmcli con up br0 nmcli con show

e.g.

2.3. Use the Bridge

2.3.1. Create a new profile for bridge networking

lxc profile create bridge-profile

Here, the eth0 is the LXD container's nic name, and setup the traffic to the br0 interface via parent parameter.

 

cat <<EOF | lxc profile edit bridge-profile

description: Bridged networking LXD profile devices:   eth0:     name: eth0     nictype: bridged     parent: br0     type: nic EOF

e.g.

2.3.2. List profile

lxc profile list

2.3.3. Launch a container and use the bridge profile

lxc launch ubuntu:20.04 c3 --profile default --profile bridge-profile

Verify

lxc exec c3 -- /bin/bash

test : connect from Host

ping 192.168.1.105

3. References

1. https://www.cyberciti.biz/faq/ubuntu-20-04-add-network-bridge-br0-with-nmcli-command/

2. https://blog.simos.info/how-to-get-lxd-containers-get-ip-from-the-lan-with-routed-network/