腾讯云centos服务器修改/etc/hosts，使其重启不失效

Posted 2021-02-01

腾讯云centos服务器修改/etc/hosts，使其重启不失效

• 使用腾讯云的服务器，我修改了/etc/hosts文件，然后操作了一下重启操作后，一打开/etc/hosts文件便如以下:

## template:jinja
{#
This file (/etc/cloud/templates/hosts.tmpl) is only utilized
if enabled in cloud-config.  Specifically, in order to enable it
you need to add the following to config:
   manage_etc_hosts: True
-#}
# Your system has configured ‘manage_etc_hosts‘ as True.
# As a result, if you wish for changes to this file to persist
# then you will need to either
# a.) make changes to the master file in /etc/cloud/templates/hosts.tmpl
# b.) change or remove the value of ‘manage_etc_hosts‘ in
#     /etc/cloud/cloud.cfg or cloud-config from user-data
#
{# The value ‘{{hostname}}‘ will be replaced with the local-hostname -#}
127.0.1.1 {{fqdn}} {{hostname}}
127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

• 然后发现之前配置的本地hosts消失了，后面认真看了下修改方式和常规的直接修改方式的不一样，直接只对/etc/hosts文件进行修改后，重启系统后添加的记录就还原了。
• 文件注释大致说法，我的系统配置了manage_etc_hosts为True，如果要修改hosts的话

a. 需要先对/etc/cloud/templates/hosts.redhat.tmpl进行修改（可以将需要修改的hosts替换掉）；
b. 然后修改/etc/cloud/templates/hosts.redhat.tmpl文件中的manage_etc_hosts的值或删除manage_etc_hosts的值在/etc/cloud/cloud.cfg文件中；

• 最后测试了下，重启主机已经不会重置hosts了