Yum update the host & containers cannot established connections


We have a docker swarm cluster on RHEL 7.4 vm servers with docker-ee-18.09.3-3.el7 package and we wanted to update these servers to RHEL 7.6.

In order to update host servers, we have executed “yum update” command and planned reboot node by node. But when yum update command is finished, connections of containers became failing until reboot.

I wonder to know is there any prosedure / best practice of updating hosts servers or could be any package cause container network problem?