Rancher HA with MariaDB Galera Cluster

I have Rancher HA with MariaDB Galera Cluster with three hosts. After the installation completed, I found that
charon process running high CPU. Anyone has similar problem and idea what causing it ?

Rancher version is 1.6.11

root 19164 19149 0 Feb07 ? 03:42:54 rancher-ipsec --gcm=true --charon-launch --ipsec-config /etc/ipsec

root 19201 19164 69 Feb07 ? 14-14:45:06 charon --debug-dmn 1 --debug-mgr 1 --debug-ike 1 --debug-chd 1 --debug-cfg 1 --debug-knl 1 --debug-net 1 --debug-asn 1 --debug-tnc 1 --debug-imc 1 --debug-imv 1 --debug-pts 1 --debug-tls 1 --debug-esp 1 --debug-lib 1