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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
systemctl stop firewalld
systemctl disable firewalld
setenforce 0 (=> I know, but for the sake of simplicity, quickness & testing, I've disabled selinux.)

    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

  • Make sure each node can resolve every other node's hostname or add hostname of each node to `/etc/hosts` on every node. For example add following lines in /etc/hosts of each node:

    Code Block
    10.10.10.1 node1
10.10.10.2 node2
10.10.10.3 node3
10.10.10.4 node4

    Where 10.10.10.1, 10.10.10.2, 10.10.10.3 and 10.10.10.4 are the IP addresses of your nodes and "node1", "node2", "node3" and "node4" are their respective hostnames.

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