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Every time I try to execute sudo su - or any other sudo command for this matter my server hangs, sometimes it take 10 mins to respond and sometimes it never does.
I checked /etc/hosts file which was configured correctly. I also checked /etc/resolv.conf file which looked good as well.
any suggestions?
I am running redhat 6.9
Had the same problem on Ubuntu 16.04 on a newly created openstack remote vm. sudo su hanged for many seconds, maybe up to a minute, before it either worked or not. When it worked it could be made quick and reliable by running this once as root:
echo 127.0.0.1 localhost $(hostname) >> /etc/hosts
The problem can reproduced when the hostname is changed , edit your /etc/hosts by adding the output of echo $HOSTNAME after 127.0.0.1:
127.0.0.1 hostname
In my case the problem was caused by multiple sudo processes running/hanging in the background, processes like sudo chmod g+rwx -R folders_with_many_files.
What helped was
ps -aleF | grep sudo
first to inspect, later something like
ps -aleF | grep sudo | awk '{print $4}' | xargs kill -9
In my case this was caused by a missing package. Unfortunately you'll need to use sudo to install it ;) I would recommend sudo su then apt install libnss-myhostname
I came here after discovering that sudo docker ps would hang forever on my fresh raspberry pi 4 with a ubuntu 20.04.
Putting the value of $HOSTNAME behind 127.0.0.1 in /etc/hosts seemed to have made sudo "more accessible".
But still docker would not run properly. apt upgrade failed for docker also, I couldn't even kill the process with ctrl + c, but had to pkill apt and then kill the process of dpkg by its PID.
Doing sudo dpkg --configure -a as suggested by another ´apt upgrade´, hung at docker-ce package again.
BUT during the first ´apt upgrade´ a new kernel had been installed. So I tried my luck with rebooting. Now it works again. Someone else had a similar experience here: https://askubuntu.com/questions/1236208/docker-ps-stuck-docker-install-also-just-hangs
In my case, after removing below config in /etc/sudoers, everything runs ok:
Defaults use_pty
sudoafter you’re already root? Does it still hang then? If so, you might try runningstrace(or some similar program) on it.strace sudo -ior so might be your friend, even if its output is daunting, because you can see what it's trying to do when it hangs.)