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Configuring containers on a SD-WAN edge

 


Fusion Broadband has the ability to host containers and docker on the edge node. The configuration relies on creating a separate instance of debian using systemd's nspawn. That can be used for a number of different applications including docker. You can also install a VPN concentrator such as softether. This is how to configure it: 

# On the SD-WAN edge

sudo nano /etc/network/interfaces

auto lo
iface lo inet loopback

iface eth0 inet manual

auto br0
iface br0 inet static
    bridge_ports eth0
    address 10.207.35.254
    netmask 255.255.255.248
    scope link
    pre-up sysctl -w net.ipv6.conf.eth0.accept_ra=0


# On the SD-WAN edge
sudo apt-get update --allow-releaseinfo-change
sudo apt-get upgrade
sudo apt-get install systemd-container debootstrap
sudo mkdir /var/lib/machines/container
sudo debootstrap \
--include curl,bridge-utils,dbus,iptables,openssh-server,vim \
bullseye /var/lib/machines/container \
http://http.debian.net/debian

If you have debootstrap key errors, do this. 

# On the SD-WAN edge
sudo systemd-nspawn --directory /var/lib/machines/container passwd
sudo systemd-nspawn --boot --directory /var/lib/machines/container/
* Log in using root password that was created in above step

hostnamectl set-hostname container
apt-get install sudo ca-certificates mtr wget
adduser admin (or suitable alternative)
usermod -aG sudo admin

sudo nano /etc/network/interfaces

auto host0
iface host0 inet dhcp

sudo chmod 4711 /usr/bin/ping

# To exit the container press Ctl [ 3 times


# On the SD-WAN edge
sudo mkdir /etc/systemd/nspawn
sudo nano /etc/systemd/nspawn/container.nspawn

[Exec]
Boot=yes
[Network]
VirtualEthernet=yes
Bridge=br0

sudo systemctl enable systemd-nspawn@container
sudo systemctl enable machines.target
sudo systemctl start machines.target


# On the SD-WAN edge
# To access the container
sudo machinectl login container

sudo apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
sudo apt-get update
sudo apt install docker-ce

It is now possible to install various docker applications such as:

The mac address of the nspawn instance can be configured with a static IP using the custom DNSMASQ configuration ability of the Fusion SD-WAN. 

dhcp-host=08:55:31:D4:B5:AD,192.168.254.253
This article was originally published over on LinkedIn: Configuring containers on a SD-WAN edge
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