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• Enable time sync, disable firewall and SElinux on every node (I know, but for the sake of simplicity, quickness & testing, I've disabled selinux):

  Code Block
  systemctl enable ntpd systemctl start ntpd iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT iptables -t nat -F iptables -t mangle -F iptables -F iptables -X iptables-save > /etc/sysconfig/iptables systemctl stop firewalld systemctl disable firewalld setenforce 0

  Also, if you are using CentOS 7 and Python 2.7.5 and above you will encounter an error during ambari agent install in Ambari UI:

  Code Block
  [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:579)

  To fix it disable cert check in Python like this (reference link):

  Code Block
  sed -i 's/verify=platform_default/verify=disable/' /etc/python/cert-verification.cfg

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