ambari installation full steps centos7 hostnamectl set-hostname your_hostname systemctl get-default systemctl set-default multi-user.target nano(vim) /etc/hosts  ==>  add , ip_of_machine  name_of_machine systemctl disable firewalld vim /etc.sysconfig/network ==> HOSTNAME=machine_hostname                                                     NETWORKING=yes vim /etc/sysctl.conf ==> add, vm.swappiness=10 vim /etc/selinux/config ==> change ,selinux=disabled yum install ntp systemctl enable ntp systemctl start ntp   vim /etc/rc.local==> enbale huge page :add ,   echo never > /sys/kernel/mm/transparent_hugepage/defrag echo never > /sys/kernel/mm/transparent_hugepage/enabled;  cd /etc/yum.repos.d yum install wget yum install ambari repo and favorite one here is 2.7.3 wget -nv http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.7.3.0/ambari.repo -O /etc/yum.repos.d/ambari.repo  yum repolist yum install ambari-server ambari-agent vim /etc/ambari-agent/conf/ambari-agent.ini ==>hostname=your_hostname                                        in security section add ==>force_https_protocol=PROTOCOL_TLSV1_2 ambari-server setup ==> dont enter advanced setup and install jdk ambari-server start go to the web page enter (hostname:8080) or machine_ip:8080 enjoy . please accept the answer after trying; best regards.   ... View more