centos7修改hostname和hosts

1、修改/etc/hostname

vim /etc/hostname

把它修改成想要的名字就可以，比如:peak6

保存退出

2、修改/etc/hosts文件

vi /etc/hosts

打开之后的内容是：

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

然后在最后面加一行你想要映射的内容,例如加上githup的host地址

# GitHup 
140.82.113.3      github.com
140.82.114.20     gist.github.com

151.101.184.133    assets-cdn.github.com
151.101.184.133    raw.githubusercontent.com
151.101.184.133    gist.githubusercontent.com
151.101.184.133    cloud.githubusercontent.com
151.101.184.133    camo.githubusercontent.com
151.101.184.133    avatars0.githubusercontent.com
199.232.68.133     avatars0.githubusercontent.com
199.232.28.133     avatars1.githubusercontent.com
151.101.184.133    avatars1.githubusercontent.com
151.101.184.133    avatars2.githubusercontent.com
199.232.28.133     avatars2.githubusercontent.com
151.101.184.133    avatars3.githubusercontent.com
199.232.68.133     avatars3.githubusercontent.com
151.101.184.133    avatars4.githubusercontent.com
199.232.68.133     avatars4.githubusercontent.com
151.101.184.133    avatars5.githubusercontent.com
199.232.68.133     avatars5.githubusercontent.com
151.101.184.133    avatars6.githubusercontent.com
199.232.68.133     avatars6.githubusercontent.com
151.101.184.133    avatars7.githubusercontent.com
199.232.68.133     avatars7.githubusercontent.com
151.101.184.133    avatars8.githubusercontent.com
199.232.68.133     avatars8.githubusercontent.com

PS:查看主机信息

#单独主机名
uname -n
#详细信息
uname -a
#单独主机名
hostname
#查看主机IP
hostname -i