XDP Loadbalancer

To load xdp bytecode

Load:

./xlb -i eth0 -v

Unload:

./xlb -i eth0 -r

Check to see the xdp binary is loaded

# ip link show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 xdp qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 52:54:00:11:00:1b brd ff:ff:ff:ff:ff:ff
    prog/xdp id 94 tag e09d47c63a72ab36 jited 

The line, "prog/xdp id 94 tag e09d47c63a72ab36 jited" indicate that the xdp byte code is correctly hooked to the eth0.

Setup loadbalancer

Basic usage of the xlb_cmdline

Usage: ./xlb_cmdline [...]
    -i Interface name(eg. eth0)
    -A ServiceIP(a.k.a. VIP)
    -t (for TCP, optional, default)
    -u (for UDP, optional)
    -r WorkerIP
    -v verbose
    -L list lb table
    -l list lbcache
    -h Display this help

Create service

./xlb_cmdline -i eth0 -A 10.1.4.1 -p 80

Add real servers

./xlb_cmdline -i eth0 -a 10.1.4.1 -p 80 -r 10.0.0.24
./xlb_cmdline -i eth0 -a 10.1.4.1 -p 80 -r 10.0.0.23
./xlb_cmdline -i eth0 -a 10.1.4.1 -p 80 -r 10.0.0.22

Show registered services.

./xlb_cmdline -i eth0 -L
service: 10.1.4.1:80(6) {
src: 10.0.0.27, dst: 10.0.0.22 (52:54:0:11:0:16)
src: 10.0.0.27, dst: 10.0.0.23 (52:54:0:11:0:17)
src: 10.0.0.27, dst: 10.0.0.24 (52:54:0:11:0:18)
}

Delete real servers

./xlb_cmdline -i eth0 -d 10.1.4.1 -p 80 -r 10.0.0.22
./xlb_cmdline -i eth0 -d 10.1.4.1 -p 80 -r 10.0.0.23
./xlb_cmdline -i eth0 -d 10.1.4.1 -p 80 -r 10.0.0.24

Delete service

./xlb_cmdline -i eth0 -D 10.1.4.1 -p 80