Full Mesh Network for Ceph Server
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Introduction
This wiki page describe a three node Ceph Server network configuration, using full mesh network (instead of a network switch). This should also work with a 5-node cluster, general you need nodes_total - 1 = nic ports. The basic idea is running a small 3 node cluster with 10 Gbit network WITHOUT buying an expensive 10 Gbit network switch.
This should works with 40 Gbit or even 100 Gbit Nics. But for this howto, 10 Gbit Intel NICs were used.
Node1
/etc/network/interface/
root@pve-2-50:~# cat /etc/network/interfaces
auto lo iface lo inet loopback
iface eth2 inet manual
auto eth3
iface eth3 inet static
address 10.14.14.50
netmask 255.255.255.0
auto eth0
iface eth0 inet static
address 10.15.15.50
netmask 255.255.255.0
up route add -net 10.15.15.51 netmask 255.255.255.255 dev eth0
down route del -net 10.15.15.51 netmask 255.255.255.255 dev eth0
auto eth1
iface eth1 inet static
address 10.15.15.50
netmask 255.255.255.0
up route add -net 10.15.15.52 netmask 255.255.255.255 dev eth1
down route del -net 10.15.15.52 netmask 255.255.255.255 dev eth1
auto vmbr0
iface vmbr0 inet static
address 192.168.2.50
netmask 255.255.240.0
gateway 192.168.2.1
bridge_ports eth2
bridge_stp off
bridge_fd 0
route
root@pve-2-50:~# route -n
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.15.15.51 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 10.15.15.52 0.0.0.0 255.255.255.255 UH 0 0 0 eth1 10.15.15.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.15.15.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 10.14.14.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3 192.168.0.0 0.0.0.0 255.255.240.0 U 0 0 0 vmbr0 0.0.0.0 192.168.2.1 0.0.0.0 UG 0 0 0 vmbr0
Node2
/etc/network/interface/
root@pve-2-51:/# cat /etc/network/interfaces
auto lo iface lo inet loopback
iface eth2 inet manual
auto eth3
iface eth3 inet static
address 10.14.14.51
netmask 255.255.255.0
auto eth0
iface eth0 inet static
address 10.15.15.51
netmask 255.255.255.0
up route add -net 10.15.15.50 netmask 255.255.255.255 dev eth0
down route del -net 10.15.15.50 netmask 255.255.255.255 dev eth0
auto eth1
iface eth1 inet static
address 10.15.15.51
netmask 255.255.255.0
up route add -net 10.15.15.52 netmask 255.255.255.255 dev eth1
down route del -net 10.15.15.52 netmask 255.255.255.255 dev eth1
auto vmbr0
iface vmbr0 inet static
address 192.168.2.51
netmask 255.255.240.0
gateway 192.168.2.1
bridge_ports eth2
bridge_stp off
bridge_fd 0
route
root@pve-2-51:/# route -n
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.15.15.50 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 10.15.15.52 0.0.0.0 255.255.255.255 UH 0 0 0 eth1 10.15.15.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.15.15.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 10.14.14.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3 192.168.0.0 0.0.0.0 255.255.240.0 U 0 0 0 vmbr0 0.0.0.0 192.168.2.1 0.0.0.0 UG 0 0 0 vmbr0
Node3
/etc/network/interface/
root@pve-2-52:~# cat /etc/network/interfaces
auto lo iface lo inet loopback
iface eth2 inet manual
auto eth3
iface eth3 inet static
address 10.14.14.52
netmask 255.255.255.0
auto eth0
iface eth0 inet static
address 10.15.15.52
netmask 255.255.255.0
up route add -net 10.15.15.51 netmask 255.255.255.255 dev eth0
down route del -net 10.15.15.51 netmask 255.255.255.255 dev eth0
auto eth1
iface eth1 inet static
address 10.15.15.52
netmask 255.255.255.0
up route add -net 10.15.15.50 netmask 255.255.255.255 dev eth1
down route del -net 10.15.15.50 netmask 255.255.255.255 dev eth1
auto vmbr0
iface vmbr0 inet static
address 192.168.2.52
netmask 255.255.240.0
gateway 192.168.2.1
bridge_ports eth2
bridge_stp off
bridge_fd 0
route
root@pve-2-52:~# route -n
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.15.15.51 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 10.15.15.50 0.0.0.0 255.255.255.255 UH 0 0 0 eth1 10.15.15.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.15.15.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 10.14.14.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3 192.168.0.0 0.0.0.0 255.255.240.0 U 0 0 0 vmbr0 0.0.0.0 192.168.2.1 0.0.0.0 UG 0 0 0 vmbr0