KnowledgeTree speed on VPSes

KnowledgeTree speed on VPSes

I was trying out KnowledgeTree 3.7.0.2 (Community Edition) on 3 different virtual private servers just to see how they fare  with “heavy” websites, and here’s how they perform generating a page of 20 items. All VPSes are 512MB instances running on Ubuntu 10.04 LTS . APC Hosting (Virtuozzo) Request created in 17.190s Rackspace Cloud Server (Xen) Request created in 0.446s Club Uptime (OpenVZ) Request created in 0.299s The most ironic thing is that the above VPSes are listed in order of most expensive to least expensive. It seems here we do not get the best performance from the most  expensive service? In fact it performs much worse than the other two! At this point, the Rackspace offering is the most attractive with its built-in manual and...

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Debian Lenny to Squeeze upgrade

Debian Lenny to Squeeze upgrade

Debian 6 i.e. “Squeeze” was released almost a month ago. Although there are still about 11 months more before Debian 5 “Lenny” is no longer supported, I figured I would upgrade one Debian Lenny Xen-based VPS hosted on a Rackspace Cloud,  currently functioning as an OpenLDAP server, as a weekend project. The upgrade steps were straightforward: 1. Edit /etc/apt/sources.list and change all instances of lenny to squeeze. 2. Run the following commands in succession in terminal sudo apt-get update sudo apt-get install apt dpkg aptitude sudo apt-get dist-upgrade Surprisingly enough the upgrade went well with Apache and even OpenLDAP migrated successfully. Just the following issues related to phpldapadmin were encountered: 1. The upgraded...

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Unattended updates on CentOS

Unattended updates on CentOS

Having recently had to clean up after the Exim4 vulnerability that did not get patched on a server in time, one of the first things I do on a new VPS is set up automatic unattended updates. The steps are clearly documented for Debian/Ubuntu, but for CentOS it was a little harder to find the information. Here are the steps: In a terminal session run yum install yum-updatesd Next you need to edit /etc/yum/yum-updatesd.conf and edit the following lines to hold the values in bold emit_via = email # automatically install updates do_update = yes # automatically download updates do_download = yes # automatically download deps of updates do_download_deps = yes and also enter the following lines # who to send the email to: email_to = myself@myemaildomain.com # who send...

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WordPress updates without FTP login prompts

WordPress updates without FTP login prompts

One gripe I have about running WordPress on a VPS is that it keeps prompting me to enter the FTP password every time I do an update. As it turns out, you can save your FTP login credentials in wp-config.php so that you never get asked again! Simply add the following lines to wo-config.php // ** FTP SETTINGS FOR AUTO-UPDATE ** // define('FTP_HOST', 'YOUR-HOSTNAME-HERE'); define('FTP_USER', 'YOUR-FTP-USERNAME'); define('FTP_PASS', 'YOUR-FTP-PASSWORD'); Remember to change the values above accordingly.

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Appending country code to all contact numbers

Appending country code to all contact numbers

And so I got the LG Optimus One for a family member and transferred over his contacts easily thanks to Mac OS X Address Book’s built-in ability to synchronize with Google Contacts. The Google Android platform certainly has some excellent features not found in the iPhone ‘s iOS – but more of that in another (future) post. The only problem was that the Optimus One could not seem to identify  a caller if his contact entry did not have the country/area code appended. As the family member’s previous phone was an old non-smartphone candy bar type, almost all his contacts did not have the country code! I was dreading the need to spend an entire afternoon doing data entry when I chanced upon an elegant solution on the Apple discussion forums....

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Solving “No Service” problem on the iPhone 3GS

Solving “No Service” problem on the iPhone 3GS

When I left for my holidays in China, I made sure to disable 3G on my iPhone 3GS to avoid getting bill shock. Once back in Singapore though, I couldn’t seem to get the iPhone to connect to the cellular network with 3G enabled. It kept saying “No Service”! This is how I solved it 1. Disable 3G in Settings/General/Network 2. Power off the iPhone by holding the top lock button down and then sliding to power off. Leave the phone off for 30 seconds 3. Power on the iPhone 4. Reset network settings in Settings/General/Reset 5. Turn on 3G No more “No service” problem now!

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