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You can use instructions from here: https://bugzilla.redhat.com/show_bug.cgi?id=1522636#c5 to setup the cluster. If you enable SELinux on any of the cluster nodes, it will make problems.
FTR, trying to run the automated test, I got this: SELinux status: enabled SELinuxfs mount: /sys/fs/selinux SELinux root directory: /etc/selinux Loaded policy name: targeted Current mode: enforcing Mode from config file: enforcing Policy MLS status: enabled Policy deny_unknown status: allowed Memory protection checking: actual (secure) Max kernel policy version: 31 selinux-policy-3.14.1-61.el8.noarch ---- time->Tue Apr 2 05:45:51 2019 type=PROCTITLE msg=audit(1554198351.207:515): proctitle="ifconfig" type=SYSCALL msg=audit(1554198351.207:515): arch=c00000b7 syscall=48 success=no exit=-13 a0=ffffffffffffff9c a1=aaaaba88e2a0 a2=4 a3=2 items=0 ppid=23534 pid=23580 auid=4294967295 uid=27 gid=27 euid=27 suid=27 fsuid=27 egid=27 sgid=27 fsgid=27 tty=(none) ses=4294967295 comm="ifconfig" exe="/usr/sbin/ifconfig" subj=system_u:system_r:mysqld_t:s0 key=(null) type=AVC msg=audit(1554198351.207:515): avc: denied { search } for pid=23580 comm="ifconfig" name="net" dev="proc" ino=3284 scontext=system_u:system_r:mysqld_t:s0 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=dir permissive=0