We have a mystery on the CentOS workstations. ssh works, but su does not. Here’s an example: [luser@gibbon ~] ssh anderson@gibbon anderson@gibbon’s password: Last login: Wed Sep 26 10:56:41 2012 from gibbon.wellesley.edu [anderson@gibbon ~] logout Connection to gibbon closed. [luser@gibbon … Continue reading
I just tried to ssh from Puma to Gibbon (as root) and got the following: [root@puma ~] ssh gibbon @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could … Continue reading
I switched the sshkeys for the new machines mv /root/sshkeys/ballroom.wellesley.edu/ssh /root/sshkeys/iguana.wellesley.edu and then check and make sure all the permissions are right in the files. And I removed all of the old, now empty directories. and changed the names in … Continue reading
Apparently Tyler gave his 349B students last semester access to another large drive that was mounted in their /home directories. Now when they do “quota” it doesn’t give an accurate reading. I tried to read the quota script, but it … Continue reading
Lyn and Mike want to install LimeSurvey on Tempest. Given that it requires PHP and MySQL, and I’ve been having trouble with that combination, we may be in for trouble, but maybe something will go well. First, we need to … Continue reading
A while ago, we got a note from Lyn saying that he had detected some inconsistencies in the groups on Puma and Tempest, and he claimed responsibility for some of them: On tempest, the last few entries of /etc/group are: … Continue reading
Note: this blogpost contains notes on several scripts, and is for reference for current or future student sysadmins so that Prof. Anderson won’t have to reexplain these scripts. “useradd fbaggins” will add files to /etc/passwd and /etc/group, which are “flat” … Continue reading
I’m again trying to get LDAP to work, instead of having to copy around flat files. Today I used authconfig –savebackup=name which writes out a directory in /var/lib/authconfig/name of all the files involved with authentication. I did that on both … Continue reading
I’m working on installing Prolog on the linux machines for Eni’s class use. I was following the instructions from http://www.swi-prolog.org/build/Redhat.html . I skipped the dependencies part because it seemed like we already had most of those packages, maybe I’ll go … Continue reading
When a student signs up for 230, she may already have a server account (if she took cs111) or not (if she placed out of cs111). Thus, they fill out a form that asks whether the account exists or not. … Continue reading