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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 4 years ago.
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I am trying to automate the build of my redhat server.
To add an existing user to sudoer:
Add user to sudoers file by using sudo visudo and add the following
line:
USERNAME ALL=(ALL:ALL) ALL
How do I perform above task using RedHat commands?
One way would be just to add username ALL = NOPASSWD:ALL to the end of /etc/sudoers.
echo "username ALL = NOPASSWD:ALL" >> /etc/sudoers
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I've inherited a Linux server that had some ssh privileges setup on it to connect to other Linux servers. The thing is there is no documentation on where those privileges are stored and they are not setup consistently across all machines.
Is there a way to check what accounts and servers I can log into without a password on an existing machine?
As #lurker says, the permissions are maintained on the server. You need look through the /etc/ssh/ssh_known_hosts and ~/.ssh/known_hosts files on all your servers to find out which hosts can connect.
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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 8 years ago.
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I have a regular username on a linux machine. I also have the root privilege. Today I found my username was deleted. That is, if I logged in as root and then ran
su myusername
The systems said "myusername" does not exist. I checked file /etc/passwd and "myusername" was not there.
My question is, is there anyway to find out who deleted "myusername"?
You might try something like this:
grep "deluser" /home/*/.bash_history /root/.bash_history
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Closed 9 years ago.
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I have an account on my college server and I access it on linux terminal using
ssh {username}#{hostname}.com
I was Wondering if there is a way to access this account only by typing.
ssh {hostname}
Put this into your $HOME/.ssh/config:
Host somealias
HostName example.com
Port 22
User myuser
You can then type ssh somealias and it will actually do a ssh -p 22 myuser#example.com
Like the comments say: Yes, if username is the same on both client and server