THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- Enable time sync, disable firewall and SElinux on every node:
# systemctl enable ntpd
# systemctl start ntpd
# systemctl status ntpd
# systemctl stop firewalld
# systemctl disable firewalld
# setenforce 0 (=> I know, but for the sake of simplicity, quickness & testing, I've disabled selinux.)
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