Posted on in System Administration
While doing some testing with Cisco Access Registrar (CAR) 5.0, I noticed that the test user had hundreds of old sessions hanging around:
--> query-sessions /r with-User X
Sessions with-User X for /Radius
Sessions for /Radius/SessionManagers/session-mgr-1:
S432 Key: 04000000000CF660, NAS: NAS.slaptijack.com, NAS-Port: 0, User-Name: X, Time …Posted on in System Administration
Users of Citrix XenServer 5.6 are experiencing a problem where the cdrommon process begins consuming all CPU resources and affecting virtual machine performance. Using 'top' or 'ps auwx' from dom0 shows that the process is consuming 99% or more CPU resources. Users of Xen Cloud Platform (XCP) 0.5 …
Posted on in System Administration
We ran across the following error on a MySQL slave server recent:
mysql> SHOW SLAVE STATUS \G
<snip>
Last_Error: Query caused different errors on master and slave. Error on master: 'Deadlock found when trying to get lock; try restarting transaction' (1213), Error on slave: 'no error' (0). Default database: '<database_name …Posted on in System Administration
As every system administrator is aware, keeping precise time on your servers can be critical. For example, if you use QueueMetrics for your Asterisk-based call center and the QM and MySQL servers are running with different times, users will notice confusing behavior as calls seem to arrive in the future …
Posted on in System Administration
On one of the WordPress-based websites I maintain, I have removed the category base so that, when browsing a category the url doesn't end with /category/category-slug/. I accomplished that by putting a single '.' in the "Category base" text box of the Permalinks admin page. This worked fine until I …
Posted on in System Administration
While setting up a new blog for an old site the other day, I ran into a situation where the main page would work, but individual posts would result in a 404 (page not found) error. Checking the error log revealed that Apache could not find the file it was …
Posted on in System Administration
Configuring your syslog server to accept logging output from your Cisco routers and switches requires a few basic steps. We'll assume that you are using a new server and haven't made any previous changes to the syslog configuration. I use <acronym title="Red Hat Enterprise Linux">RHEL</acronym> 5 most …
Posted on in System Administration
This problem happened on a Mac Mini running OS X 10.4 (Tiger) not too long ago. The user was trying to run tshark against interface en2 — a USB <acronym title="Network Interface Card">NIC</acronym>. The tshark command produced the following output.
# tshark -w /tmp/slap -i en2
Capturing …Posted on in System Administration
Posted on in System Administration
install_driver(Sybase) failed: Can't load '/usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi/auto/DBD/Sybase/Sybase.so' for module DBD::Sybase: libct.so.3: cannot open shared object file: No such file or directory at /usr/lib/perl5/5.8.0/i386-linux-thread-multi/DynaLoader.pm line 229.
at (eval …Posted on in System Administration
If you have SSH open toward the Internet, you are surely aware of the number of brute force password attempts your server sees everyday. Although a good password policy may make these attempts nothing more than an annoyance, each connection to your SSH daemon takes up valuable server resources. I …
Posted on in System Administration
If you've ever seen this, you've felt my pain:
# mount -vv -t nfs4 slap:/export/a/b/c /mnt
mount: pinging: prog 100003 vers 4 prot tcp port 2049
mount.nfs4: slap:/export/a/b/c failed, reason given by server: No such file or directory
My original thought was …
Posted on in System Administration
Viewing and changing the time zone in Mac OS X via the command line uses the systemsetup command:
$ sudo systemsetup -gettimezone
Time Zone: US/Eastern
$ sudo systemsetup -listtimezones
<snipped>
$ sudo systemsetup -settimezone US/Central
Set TimeZone: US/Central
$ sudo systemsetup -gettimezone
Time Zone: US/Central
This command is available both …
Posted on in System Administration
I recently needed to archive a bunch of old home directories on a CIFS share mounted on my Windows XP virtual machine. I wanted each home directory to be archived independently so that I would have lots of smaller zip files rather than one huge one. Additionally, maintaining the directory …
Posted on in System Administration
Network Appliance (NetApp) advanced single-instance storage (A-SIS) deduplication is a free technology that ships with every NetApp filer. The technology works at the block level to efficiently compress volumes so that you can get more data in a limited space. All the deduplication setup and maintenance operations are controlled with …
