centos7安装nslookup工具、ntp工具

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原文链接：http://www.cnblogs.com/fqxy/p/10112193.html

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#运维 #操作系统

本文详细介绍了在CentOS7系统中如何安装和配置DNS解析工具nslookup及DNS服务器dnsmasq，实现localhost的本地解析，并通过设置NTP同步服务器，确保系统时间的准确性和一致性。

2018-12-13

centos7安装nslookup工具

yum install bind-utils -y

DNS解析localhost到本机

# 1.检测
[root@node2 ~]# nslookup localhost
Server:     118.118.118.9
Address:    118.118.118.9#53
 
Non-authoritative answer:
Name:   localhost.openstacklocal
Address: 183.136.168.91
 
# 2.搭建DNS
yum -y install dnsmasq
cp /etc/resolv.conf{,.bak}
rm -rf /etc/resolv.conf
echo -e "nameserver 127.0.0.1\nnameserver $(hostname -i)" >> /etc/resolv.conf
chmod 444 /etc/resolv.conf
chattr +i /etc/resolv.conf
echo -e "server=8.8.8.8\nserver=8.8.4.4" > /etc/dnsmasq.conf
echo -e "$(hostname -i)\tlocalhost.$(hostname -d)" >> /etc/hosts
service dnsmasq restart
 
# 3.再次检测
[root@master ~]# nslookup localhost
Server:     127.0.0.1
Address:    127.0.0.1#53
 
Name:   localhost
Address: 192.168.1.78