创建一台虚拟机

1.安装VM

2.修改VMware网络

1）点击VMware的“虚拟网络编辑器” - “VMnet8” - “更改设置” - 子网IP：10.4.7.0/子网掩码：255.255.255.0
2）在上边1点的界面：“点击NAT设置” - 网关IP：10.4.7.254
3）“控制面板” - “网络和共享中心” - “更改适配设置”- “VMnet8” - “ipv4属性” - IP：10.4.7.1/子网掩码：255.255.255.0 - “高级” - 自动跃点：10

2.修改centos网络

~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE="Ethernet"
BOOTPROTO="none"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR=10.4.7.12
NETMASK=255.255.255.0
GATEWAY="10.4.7.254"
DNS1="10.4.7.254"
~]# systemctl restart network
~]# hostnamectl set-hostname hdss7-12.host.com

如需修改网卡名则
~]# mv ifcfg-xxx ifcfg-eth0
~]# vi /etc/default/grub
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos_hadoop2/root rd.lvm.lv=centos_hadoop2/swap rhgb quiet net.ifnames=0 biosdevname=0"
~]# grub2-mkconfig -o /boot/grub2/grub.cfg
~]# reboot

修改主机名
~]# hostnamectl set-hostname XXX

3. 验证SELinux是否关闭

~]# getenforce
Disabled

~]# vi /etc/sysconfig/selinux
修改 SELINUX=disabled

4.验证内核版本，是否>3.8

~]# uname -a
Linux hdss7-200.host.com 3.10.0-1062.el7.x86_64 #1 SMP Wed Aug 7 18:08:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

5.关闭firewalld

/]# systemctl status firewalld
~ ]# systemctl stop firewalld
~ ]# systemctl disable firewalld
~ ]# systemctl list-unit-files | grep enabled  --查看开机启动的列表
~ ]# systemctl is-enabled firewalld.service    --查看是否开机启动

6.chrony同步服务器时间

1、安装 yum -y install chrony

2、启动：systemctl start chronyd
开机启动：systemctl enable chronyd
查看服务状态：systemctl status chronyd

3、配置chrony：vi /etc/chrony.conf
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
server ntp.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp1.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp2.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp3.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp4.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp5.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp6.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp7.aliyun.com minpoll 4 maxpoll 10 iburst

4.重启systemctl restart chronyd

5.校验时间
chronyc tracking

6.运行以下命令查看时间同步服务器列表。
chronyc -n sources -v

 

yum install chronyd

vi /etc/chrony.conf
server ntp.aliyun.com  minpoll 4 maxpoll 10 iburst
server ntp1.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp2.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp3.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp4.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp5.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp6.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp7.aliyun.com minpoll 4 maxpoll 10 iburst

systemctl start chronyd.service
systemctl status chronyd.service
systemctl enable chronyd.service
systemctl list-unit-files chronyd.service |grep chronyd

检验是否正常

chronyc tracking

Reference ID    : 5EC69F0A (ntp1.time.nl)
Stratum         : 2
Ref time (UTC)  : Thu May 20 15:19:08 2021
System time     : 0.000022151 seconds slow of NTP time
Last offset     : -0.000041040 seconds
RMS offset      : 0.000053422 seconds
Frequency       : 2.286 ppm slow
Residual freq   : -0.000 ppm
Skew            : 0.012 ppm
Root delay      : 0.012706812 seconds
Root dispersion : 0.000430042 seconds
Update interval : 1029.8 seconds
Leap status     : Normal

如果该命令返回结果如下，则表示同步过程出错：
Leap status    : Not synchronised

如果该命令返回结果如下，则表示 Chrony 服务未正常运行：
506 Cannot talk to daemon