@Kibrom Gebrehiwot These are some of the steps you should try before reinstalling your server! Disable firewall / iptables on the host Run all the below command like root
Execute the below command on the server to disable the firewall, type the following command as the root user to disable firewall for IPv6:
[root@hiroshima01 ~]# service ip6tables stop [root@hiroshima01 ~]# chkconfig ip6tables off [root@hiroshima01 ~]# service iptables status
IPv4 [root@hiroshima01 etc] # service iptables save [root@hiroshima01 etc] # service iptables stop [root@hiroshima01 etc] # chkconfig iptables off Disable Transparent Huge Pages (THP) Disable it on the host otherwise the Ambari install will fail [root@hiroshima01 ~]# echo never > /sys/kernel/mm/redhat_transparent_hugepage/enabled [root@hiroshima01 ~]# echo never > /sys/kernel/mm/redhat_transparent_hugepage/defrag To disable or make these changes persistent across reboots I add this to the bottom of my vi /etc/rc.local #disable THP at boot time
if test -f /sys/kernel/mm/redhat_transparent_hugepage/enabled; then echo never > /sys/kernel/mm/redhat_transparent_hugepage/enabled fi if test -f /sys/kernel/mm/redhat_transparent_hugepage/defrag; then
echo never > /sys/kernel/mm/redhat_transparent_hugepage/defrag
fi To validate THP is disabled, I run the below three commands, or any variant you choose from here . [root@hiroshima01 ~]# cat /sys/kernel/mm/redhat_transparent_hugepage/defrag #output should be always madvise [never]
[root@hiroshima01 ~]# cat /sys/kernel/mm/redhat_transparent_hugepage/enabled # output should be always madvise [never] Disable SELinux SELinux must be disabled for Ambari to function. To temporarily disable SELinux, run the following command on each host in your cluster: [root@hiroshima01 ~]# setenforce 0 Permanently disabling SELinux so that on system reboot it does not restart edit the SELinux config and set SELINUX to disabled. on each host: root@hiroshima01 ]# vi /etc/selinux/config Add the below lines # This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: # enforcing - SELinux security policy is enforced. # permissive - SELinux prints warnings instead of enforcing. # disabled - SELinux is fully disabled. SELINUX=disabled
# SELINUXTYPE= type of policy in use. Possible values are: # targeted - Only targeted network daemons are protected. # strict - Full SELinux protection. SELINUXTYPE=targeted
Configure the NTPD services
You must setup the NTPD server on CentOS to successfully implement Ambari follow the below steps to install and start the NTPD server. As the root user. To install ntpdate [root@hiroshima01 ~]# yum install ntp ntpdate Turn on the service: [root@hiroshima01 ~]# chkconfig ntpd on Synchronize the system clock with 0.pool.ntp.org server [root@hiroshima01 bin]# ntpdate pool.ntp.org 2 Jan 21:42:49 ntpdate[5101]: 31.3.135.236 rate limit response from server. 2 Jan 21:43:56 ntpdate[5101]: step time server 212.51.144.44 offset 67.520940 sec Check the NTPD services configure it start at system boot [root@hiroshima01 bin]# chkconfig --list ntpd
ntpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off Start the NTP server. The following will continuously adjust system time from upstream NTP server. No need to run ntpdate: [root@hiroshima01 ~]# /etc/init.d/ntpd start or [root@hiroshima01 ~]# service ntpd start
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