here
一、环境准备：（这儿准备了三台虚拟机：内存6-3-3）
JDK: yum -y remove java java-1.6.0-openjdk rpm -e java-1.7.0-openjdk-headless rpm -e java-1.8.0-openjdk-headless yum install chkconfig python bind-utils psmisc libxslt zlib sqlite fuse fuse-libs redhat-lsb cyrus-sasl-plain cyrus-sasl-gssapi -y vi /etc/profile export JAVA_HOME=/usr/java/jdk1.8.0_162 export CLASSPATH=.:${JAVA_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH #1 vi /etc/sysconfig/network NETWORKING=yes HOSTNAME=hadoop1 #2 cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.243.129 node-1 192.168.243.133 node-2 192.168.243.134 node-3 #3 selinux关闭 setenforce 0 sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config sestatus #4 firewall systemctl stop firewalld systemctl disable firewalld #5 NTP http://blog.csdn.net/scorpio3k/article/details/49645219 systemctl restart ntpd chkconfig --level 35 ntpd on #6 SSH无密码登录配置 http://www.cnblogs.com/book-gary/p/5761268.html ssh node-1 date;ssh node-2 date;ssh node-3 date #7 ulimit -a cat /etc/security/limits.d/20-nproc.conf * soft nproc unlimited * soft nproc unlimited * hard nproc unlimited * hard nproc unlimited * soft nofile 65535 * hard nofile 65535 #8 降低虚拟内存需求率 cat /proc/sys/vm/swappiness echo 0 > /proc/sys/vm/swappiness 永久降低虚拟内存需求率 echo 'vm.swappiness = 0' > /etc/sysctl.d/swappiness.conf 并运行如下命令使生效 sysctl -p #9 检查透明大页面 cat /sys/kernel/mm/transparent_hugepage/defrag vi /etc/rc.local echo never > /sys/kernel/mm/transparent_hugepage/defrag echo never > /sys/kernel/mm/transparent_hugepage/enabled chmod +x /etc/rc.d/rc.local