I tried to configure Wireguard for a K3s multi-site cluster, my issue is with routing.
There are at least 4 nodes, 2 in one location + 1 in other location and + 1 in other location.
Assumptions:
- 10.50.0.0/16 network is for physical nodes
- 10.42.0.0/16 network is for pods
- 10.43.0.0/16 network is for services
- Each of physical node can create a Pod, which have assigned an unique IP address in 10.42.0.0/16 range
- Each Pod on each physical node should be able to ping each other
Deployed configuration worked only between last two nodes, the rest nodes cannot even ping each other. I guess it may be something with the routing, but I have not enough knowledge to check this.
Example configurations from two of nodes:
10.50.54.100:
[Interface]
# primary-1
Address = 10.50.54.100/24
PrivateKey = pr111111111111111111111111111111111111111111
ListenPort = 443
MTU = 1500
PostUp = sysctl -w net.ipv4.ip_forward=1
PostUp = echo 1 > /proc/sys/net/ipv4/ip_forward
PostUp = ufw allow 443/udp || true
PostUp = iptables -A FORWARD -i %i -j ACCEPT; iptables -A FORWARD -o %i -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
PostDown = iptables -D FORWARD -i %i -j ACCEPT; iptables -D FORWARD -o %i -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE
PostDown = sysctl -w -q net.ipv4.ip_forward=0
PostDown = echo 0 > /proc/sys/net/ipv4/ip_forward
[Peer]
# infra-1
PublicKey = pub11111111111111111111111111111111111111111
AllowedIPs = 10.50.54.0/16, 10.42.0.0/16, 10.43.0.0/16
PersistentKeepalive = 15
Endpoint = xxxxxxxxxx:443
[Peer]
# compute-2
PublicKey = pub2222222222222222222222222222222222222222
AllowedIPs = 10.50.54.0/16, 10.42.0.0/16, 10.43.0.0/16
PersistentKeepalive = 15
Endpoint = yyyyyyyyyy:443
[Peer]
# storage-1
PublicKey = pub3333333333333333333333333333333333333333
AllowedIPs = 10.50.54.0/16, 10.42.0.0/16, 10.43.0.0/16
PersistentKeepalive = 15
Endpoint = zzzzzzzzzzz:443
10.50.54.2:
[Interface]
# infra-1
Address = 10.50.54.2/24
PrivateKey = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
ListenPort = 443
MTU = 1500
PostUp = sysctl -w net.ipv4.ip_forward=1
PostUp = echo 1 > /proc/sys/net/ipv4/ip_forward
PostUp = ufw allow 51820/udp || true
PostUp = iptables -A FORWARD -i %i -j ACCEPT; iptables -A FORWARD -o %i -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
PostDown = iptables -D FORWARD -i %i -j ACCEPT; iptables -D FORWARD -o %i -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE
PostDown = sysctl -w -q net.ipv4.ip_forward=0
PostDown = echo 0 > /proc/sys/net/ipv4/ip_forward
[Peer]
# primary-1
PublicKey = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
AllowedIPs = 10.50.54.0/16, 10.42.0.0/16, 10.43.0.0/16
PersistentKeepalive = 15
Endpoint = xxxxxxxxxxxx:443
[Peer]
# compute-2
PublicKey = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
AllowedIPs = 10.50.54.0/16, 10.42.0.0/16, 10.43.0.0/16
PersistentKeepalive = 15
Endpoint = yyyyyyyyyyy:443
[Peer]
# storage-1
PublicKey = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
AllowedIPs = 10.50.54.0/16, 10.42.0.0/16, 10.43.0.0/16
PersistentKeepalive = 15
Endpoint = zzzzzzzzzzzz:443
Do you have any clue? How this should be designed with Wireguard? Why this configuration does not work?
Thanks!
