1、修改linux启动级别
vim /etc/inittab
将id后面的5改成3
重启 init 6
yum 换源
wget -O /etc/yum.repos.d/CentOS-base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
yum makecache
2、时间同步 三台都需要同步
yum install ntp
ntpdate -u s2c.time.edu.cn
3、外网权限
vim /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
onBOOT=yes
NM_ConTROLLED=yes
BOOTPROTO=none
IPADDR=192.168.129.101
NETMASK=255.255.255.0
GATEWAY=192.168.129.2
DNS1=192.168.129.2
service network restart
systemctl set-default multi-user.target
hadoop dfs admin -safemode get 命令是用来查看当前hadoop安全模式的开关状态
hadoop dfs admin -safemode enter 命令是打开安全模式
hadoop dfs admin -safemode leave 命令是离开安全模式
