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

问题复现

使用 hostnamectl hostname 命令更改 hostname 之后使用 sudo 后出现报错 sudo: unable to resolve host cloudcone: Name or service not known

解决方案

修改 /etc/hosts 文件 添加 127.0.0.1 cloudcone ::1 cloudcone cloudcone 是我设置的新 hostname

27.0.0.1       localhost
127.0.0.1       cloudcone

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