Posted in Linux, System Administration, Technique, tagged nginx, nginx configuration, nginx error on February 24, 2010 | Leave a Comment »
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 [...]
Posted in Linux, System Administration, Technique, tagged backup, Backup Script, MySQL, System Administration on December 26, 2009 | Leave a Comment »
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, [...]
Posted in AppCove, Engineering, Linux, reSearch, tagged Apache, mod_wsgi, Performance, Python, python 3 on October 11, 2009 | Leave a Comment »
We’re researching the use of Python and mod_wsgi running under apache for developing some extensive web applications. Here are some notes on a performance test that we recently ran.
==================================================================
Server:
x86_64
Python 3.1.1
mod_wsgi 3.0c5
apache 2.2
RHEL 5.3
quad core xenon
8 GB ram
Development system – not in production use.
==================================================================
Application:
1 import time
2
3 def application(environ, start_response):
4 status = ‘200 OK’
5
6 [...]
Posted in Engineering, Linux, System Administration, tagged AB, Apache, Benchmarking, Cloud Server, Performance on August 1, 2009 | 3 Comments »
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), [...]
Posted in AppCove, Linux, System Administration, Technique, tagged Cisco CSS, SSL Certificates, System Administration on April 6, 2009 | Leave a Comment »
Upgrading a SSL certificate using the Cisco 11500 Series Content Services Switch (CSS)
Posted in AppCove, Linux, System Administration, Technique, tagged Apache, EPEL, Linux, RHEL, RPM, System Administration, YUM on March 8, 2009 | Leave a Comment »
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 [...]
Posted in AppCove, Linux, System Administration, Technique, tagged Bloglet, RedHat, RHEL, RPM, SRPM on March 1, 2009 | 1 Comment »
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 [...]
Posted in AppCove, Linux, reSearch, tagged EPEL, Linux, RPM, YUM on February 8, 2009 | 1 Comment »
This is in reference to http://blog.gahooa.com/2009/01/18/fedora-or-redhat-enterprise-linux-in-a-production-environment/.
After the excellent comment by Sergio Olivo, I did some heavy looking into the Extra Packages for Enterprise Linux project (EPEL for short). On a brand-spanking-new RHEL 5 box, I installed the YUM repository for EPEL, and quite immediately had access to tons of extra packages. Erlang is there. Git [...]
Posted in AppCove, Linux, reSearch on January 18, 2009 | 2 Comments »
[UPDATE AT http://blog.gahooa.com/2009/02/08/update-on-fedora-vs-redhat-enterprise-linux/]
At AppCove, we run RedHat Enterprise Linux on all of our servers. RHEL is great, because:
It works
It still works
Automatic security updates
Did I mention, it just works?
RedHat, as far as I know, takes a very serious perspective on patching all of their RPM’s and automatically pushing them out via the update agent (up2date). They [...]
