Feeds:
Posts
Comments

Archive for the ‘System Administration’ Category

Was playing around with nginx on Centos 5 (EPEL package).
Most of the time I ran:
service nginx restart
I would get this message in the /var/log/nginx/error.log file:
panic: MUTEX_LOCK (22) [op.c:352].
After some hunting around, it appears to be a known bug in nginx (perhaps perl in nginx?)… Anyway, a simple workaround is to do this:

service nginx stop
service nginx [...]

Read Full Post »

Rather than use –all-databases, which will prevent you from being able to selectively restore any single database, consider the following:
Ideally, you should have a daily backup, with some history. It should be bulletproof (–force), it should be logged (>> …log), it should be compressed (| gzip), it should keep separate copies of each database, [...]

Read Full Post »

Ever have one of those bugs that customers complain about, but you just cannot reproduce it? Here is a good one…
Customers were complaining about being logged out when clicking a download link.
This particular setup is a Cisco CSS 11501 series load balancer with 2 Dell Poweredge web servers sitting behind it.  Each webserver is running [...]

Read Full Post »

Apache load testing on a Cloud Server – Jason – 7/31/2009

I recently created a cloud server for a wordpress blog, and configured it to the point that the blog was working OK.  Then I decided to check the performance aspects of the server, as it was a small 256 MB + 10GB machine.
Using apachebench (ab), [...]

Read Full Post »

Upgrading a SSL certificate using the Cisco 11500 Series Content Services Switch (CSS)

Read Full Post »

As I was discussing lightly before, I have recently been involved in building quite a few RPMs for our server clusters at AppCove.

Where we have arrived:
Our (new) primary production cluster consists of multiple RedHat Enterprise Linux 5 boxes in different capacities (webserver, appserver, database master, database slave, etc…).
Each machine is registered with 3 yum repositories:

RHEL [...]

Read Full Post »

I’ve been involved in an ongoing project to build RPMs for all of the “custom” software installs we use on RedHat Enterprise Linux 5 (RHEL5) at AppCove.
By default (on RHEL), source RPMs are installed to /usr/src/redhat. This is nice, except that I don’t want to be running as root when building software.
rpm -i –relocate [...]

Read Full Post »