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Closed 8 years ago.
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I am trying to change a machine name for one of my CentOS servers. How would one go about changing it from saying:
user#XXXXXX (where I want to change what the XXXXX is)
Also if I change what the XXXXX is will someone be able to take the IP address of the server and figure out the new XXXXX?
Thanks.
Use the hostname command to change the hostname for the current session (it'll revert after you reboot) and edit /etc/hostname to change it permanently. You'll want to use both for the best results, as editing /etc/hostname doesn't change anything until you reboot.
E.g:
hostname newhost.example
echo "newhost.example" > /etc/hostname
These both need to be run as the root user.
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Closed 1 year ago.
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I'm using ubuntu 18.04 on my dell inspiron 5402.I was annoyed about my unstable wifi,so I followed some method on the Internet and unfortunately got this problem.
Now when I open chrome, there is DNS_PROBE_FINISHED_BAD__CONFIG displayed.
I checked my /etc/resolv.conf file and it showed broken symbolic link to /run/systemd/resolv/stub.resolv.conf,but when I checked the /run/systemd/ directory ,there was no resolv.
I get fully confused and don't know what to do next .
try this to revert your dns config
resolvectl revert INF-NAME
it could revert back your dns config per-interfaces
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Closed 2 years ago.
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On my machine i'm getting "root#umar" that I want to change to "root#junaid". I have tried running different commands. They do change my username but above mentioned name is not changing.
See in above image. User I'm logged in as is "Junaid". But before that there is "root#umar" that I want to be changed to "root#junaid". Solutions I have tried change my current username that I'm loggedIn as.
Any solution?
"umar" is the hostname. So you should change it to get prompt like "root#junaid"
To do this on the fly you should exec next command:
sudo hostname junaid
sudo vi /etc/hostname
(to update the hostname there)
and the same in hosts file
sudo vi /etc/hosts
If you run commands as root you do not need to have sudo
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Closed 4 years ago.
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Does sudoers file required to restart to take changes effect. If yes, then how we can restart? without resarting the system.
If your question is : "do I need to restart my machine if I add someone in the sudoers file ?" the answer is : No, you don't need to restart, the newly user added in the sudoers will be able to use sudo as soon as you save the file.
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Closed 7 years ago.
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I have a Linux Server. The SSH is well-configured (my only way to access the server by the way).
Now, let's take a user, for example me (pofilo).
I want only one connection in SSH at the same time from the user pofilo (that means that nobody else can be connected with this user if someone is already connected).
You can set a max # of log-ins in /etc/security/limits.conf (for a user or group).
If you need an example:
echo "#loginrestriction - maxlogins 4" >> /etc/security/limits.conf
echo "username - maxlogins 1" >> /etc/security/limits.conf
useradd -G loginrestriction a_username
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Closed 9 years ago.
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Is it possible to add scripts (like curl) to /etc/hosts? I am trying to set up a subdomain over ddns, and it's really hard to update my /etc//hosts file on the fly when my IP address updates without my knowledge. Thanks in advance.
No it's not. However, you will probably have some scripts that can be triggered when you get an IP address or something similar and those can be used to rewrite your /etc/hosts.