sudo unable to resolve host test : Name or service not known

sudo: unable to resolve host test: Name or service not known

出现这个问题一般是自定义了主机名test，然后hosts中没找到对应的主机名

确认错误

robin@test:~$ host

输出如下：

test

表示test是当前的hostname

重现错误

robin@test:~$ sudo

输出如下：

sudo: unable to resolve host test: Name or service not known
usage: sudo -h | -K | -k | -V
usage: sudo -v [-AknS] [-g group] [-h host] [-p prompt] [-u user]
usage: sudo -l [-AknS] [-g group] [-h host] [-p prompt] [-U user] [-u user] [command]
usage: sudo [-AbEHknPS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p prompt][-T timeout] [-u user] [VAR=value] [-i|-s] [<command>]
usage: sudo -e [-AknS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p prompt][-T timeout] [-u user] file ...

解决错误

robin@test:~$ cat /etc/hosts

输出：

127.0.0.1       localhost
# The following lines are desirable for IPv6 capable hosts
::1     localhost       ip6-localhost   ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

可以看到，这里只有localhost，没有test，那么咱们只需要用vim编辑器给他增加一行即可。

使用su - root切换到root用户，或者使用sudo

robin@test:~$ sudo vim /etc/hosts

增加后

127.0.0.1       localhost
127.0.0.1       test
# The following lines are desirable for IPv6 capable hosts
::1     localhost       ip6-localhost   ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

再次检查

robin@test:~$ sudo

usage: sudo -h | -K | -k | -V
usage: sudo -v [-AknS] [-g group] [-h host] [-p prompt] [-u user]
usage: sudo -l [-AknS] [-g group] [-h host] [-p prompt] [-U user] [-u user] [command]
usage: sudo [-AbEHknPS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p prompt][-T timeout] [-u user] [VAR=value] [-i|-s] [<command>]
usage: sudo -e [-AknS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p prompt][-T timeout] [-u user] file ...

成功

参考链接：
Sudo: unable to resolve host explained

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sudo unable to resolve host test : Name or service not known

确认错误

重现错误

解决错误

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