Amazon has extensive guide on how to add IPv6 support to your VPC and EC2 instances. However there are issues with cloud-init package preserving IPv6 connectivity between reboots on CentOS.
System Administration
Let’s Encrypt offers free wildcard SSL certificates
Wildcard SSL certificates are now available for free from Let’s Encrypt in addition to regular SSL certificates. This initiative allows many individuals and companies to adopt more secure HTTPS protocol.
CentOS 7: fail2ban and logwatch
After installing and setting up CentOS 7 I noticed that fail2ban bans/unbans are no longer included in the daily logwatch reports.
Upload to Rackspace Cloud Files using a shell script
rackspace-cloudfiles.sh is a bash script that provides command-line interface to Rackspace Cloud Files and includes multi-region support.
Strip comments and blank lines from file in Unix
Command shown below displays configuration file and strips commented and blank lines on Unix-like operating system.
grep -E -v '^\s*#|^\s*$|^\s*;' fileor
egrep -v '^\s*#|^\s*$|^\s*;' file
Ultramonkey on CentOS 4 with BlueQuartz (part 2)
I already wrote about additional steps required to install UltraMonkey on CentOS with BlueQuartz. Soon after that I have discovered that there is more to do if you want to get a perfect setup.
UltraMonkey on CentOS 4 with BlueQuartz
Solution for a problem with duplicate addresses when using UltraMonkey on CentOS 4 with BlueQuarz.
ColdFusion 8 on CentOS 4 with BlueQuartz
When starting ColdFusion for the first time connector wizard cannot configure web server correctly.
Starting ColdFusion 8... The ColdFusion 8 server is starting up and will be available shortly. ====================================================================== Running the ColdFusion 8 connector wizard ====================================================================== Configuring the web server connector (Launched on the first run of the ColdFusion 8 start script) Running apache connector wizard... ColdFusion 8 not started, will retry connector 12 more time(s) ColdFusion 8 not started, will retry connector 11 more time(s) ColdFusion 8 not started, will retry connector 10 more time(s) ColdFusion 8 not started, will retry connector 9 more time(s) ColdFusion 8 not started, will retry connector 8 more time(s) ColdFusion 8 not started, will retry connector 7 more time(s) ColdFusion 8 not started, will retry connector 6 more time(s) ColdFusion 8 not started, will retry connector 5 more time(s) ColdFusion 8 not started, will retry connector 4 more time(s) ColdFusion 8 not started, will retry connector 3 more time(s) ColdFusion 8 not started, will retry connector 2 more time(s) ColdFusion 8 not started, will retry connector 1 more time(s) The connector wizard has not been able to contact the local ColdFusion 8, connector installation aborted. ====================================================================== ColdFusion 8 has been started. ColdFusion 8 will write logs to /opt/coldfusion8/logs/cfserver.log ======================================================================
How to compile Strongbolt kernel on Cobalt RaQ4
Cobalt RaQ4 was laying around collecting dust so I decided to give it a second chance. Guys from OS Office (http://www.osoffice.co.uk) put together Strongbolt – excellent Linux distribution based on CentOS with Cobalt RaQ support.
I wanted to use Cobalt RaQ4 to test highly available and load balanced cluster configuration. However current Strongbolt kernel 2.6.16i586 doesn’t have IP virtual server support and had to be recompiled.
Hungry Microsoft mouse
Recently I was in the nearest Circuit City store and picked up a laptop mouse. It is a regular mouse with no additional buttons or features.
When I saw system requirements printed in fine print on the back of the package, I didn’t believe my eyes at first – 100 MB of free space on hard drive! It is totally unthinkable considering the fact that there is a great chance that Microsoft XP/Vista will support it without any drivers. Where did those days go when developers cared about optimization?
