vi /etc/hosts 127.0.0.1 localhost server01 192.168.56.101 server01.hadoop.com server01 192.168.56.102 server02.hadoop.com server02 192.168.56.103 server03.hadoop.com server03 vi /etc/sysconfig/network HOSTNAME을 server01.hadoop.com으로 변경 service network restart 커널 파라미터 매개변수 / 방화벽 vi /etc/selinux/config service iptables stop chkconfig iptables off chkconfig ip6tables off sysctl -w vm.swappiness=100..