UNIX for Dummies Questions & Answers

I am using AIx 4.3.3 and was wondering what the command was to keep users from logging in. I want to be able to do maintenance and keep the users out. Can anyone help?

1- A dirty way is:

a) view and log the actual the permisions of /usr
ls -l /usr

b) change the values
chmod 0750 /usr

c) make the change.

d) restore the original settings


2- another way is to disallow the login user by user

chuser login=false rlogin=false <login_name>

3- If you use the console for the maintenance

3.1.a- stop the inetd
stopsrc -s inetd
3.1.b make the change
3.1.c startsrc -s inetd

3.2.a ifconfig en0 down
3.2.b make the change
3.2.c ifconfig en0 up

Regards, Hugo.

Probably the easiest one is to do a "/sbin/init.d/inetd stop" and then when you are done do a "/sbin/init.d/inetd start".

_______________________________________________
There are several ways to do this.

There is one caveat, "Don't log out yourself".

1) you can kill the inetd daemon. Can't login without a telnet session or FTP session. As above...

2) Move the password file. Can't login without a password.

3) Change permissions on the / directory to 700. This will disallow users from logging in as well. I did this once by accident. You can search for others who have done the same by accident!

4) Reboot into single user mode. Removes all network connectivity.


I am sure there are several other ways, but these are the most useful.



Of course you must either kick out the active users, or ask them to logout for maintenance. Try to be as nice as possible.

I think about the post and remember that
the simplest way is to create a file /etc/nologin.
This file disable all new logins.

touch /etc/nologin

Monterrey project was established a init.d directory?
I think that not yet; but you can find it. If you want, you
can use the /etc/rc<X>.d directory strtuctures.

Regards. Hugo

According to the type of maintenance you need to go down
to the single user level (example when you put a maintenance level). When yo need to do this:

a- Login into the console

b- shutdown in maintenance mode
shutown -m

c- take an mksysb

d- upgrade the system
smitty update_all

Note: in the web http://www.redbooks.ibm.com there are
several redbooks (books) for AIX. Search AIX and tell me.

Good luck. Hugo.

Another simple way to do this is to put
your system in single user mode

by issuing init 1 or init s but you have
to logon from the console.

After maintaince issue init 3 or use control -d key to bring the system back to the default run level.

The correct way to do this is:

touch /etc/nologin

Just remember to remove /etc/nologin, when you are finished. Rebooting will automatically remove it.