When you use SSH to connect to the lightweight application server Ubuntu instance of alicloud and execute the command sudo Su root, you will be prompted:

The basic use of sudo at the beginning of the command will prompt this information, looking more uncomfortable

Although sudo can still run normally, the warning message comes out every time. This is just a problem in the reverse solution of the machine, so you can set it directly from/etc/hosts, so that ABC (host name) can solve the IP of 127.0.0.1

Solutions

You need to modify the/etc/hosts file:

sudo vi /etc/hosts

In

127.0.0.1       localhost

Next add a record:

127.0.0.1         iZj6c9c6vaqj1i0a9j7h78Z

Or add to the following:

127.0.0.1        localhost     iZj6c9c6vaqj1i0a9j7h78Z

Type izj6c9c6vaqj1i0a9j7h78z

References

1. https://yq.aliyun.com/articles/495245

2. https://blog.csdn.net/skh2015java/article/details/80152730