pgpool2 watchdog config with sudo and ip addr instead of ifconfig

pgpool.conf

# Watchdog
#------------------------------------------------------------------------------
use_watchdog = on
delegate_IP = '10.10.10.100'
wd_hostname = '10.10.10.21'
wd_port = 9000
ifconfig_path = '/usr/bin'
arping_path = '/usr/bin'
if_up_cmd = 'sudo ip addr add $_IP_$ dev eth0'
if_down_cmd = 'sudo ip addr del $_IP_$ dev eth0'
arping_cmd = 'sudo arping -U $_IP_$ -w 1'
wd_interval = 3
other_pgpool_hostname0 = '10.10.10.22'
other_pgpool_port0 = 5432
other_wd_port0 = 9000

sudoers

postgres ALL=(ALL) NOPASSWD:/usr/bin/arping,/bin/ip