Linux sudo command execution slow problem

First, symptoms

sudo command execution is slow, for example: sudo-u root ls-l/tmp, running after a very long time to run the results of the instructions

Ii. Solutions

Generally because there is no corresponding "host name <--> IP address" in the/etc/hosts file, mutual resolution entries

The workaround is as follows:

1 run the hostname command first, display the current host name
[Root@mylinux ~]# hostname
Mylinux

2) then add a mutual resolution entry between the host name and the IP address in the/etc/hosts file
[Root@mylinux ~]# Echo ' 127.0.0.1 mylinux.localdomain mylinux ' >>/etc/hosts