All posts by kortsi

Getting a Certificate for your Web Server

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To communicate securely using SSL (also known as TLS or Transport Layer Security), web servers need a key pair of public and private keys. This key pair can be generated and signed by yourself, but to prevent the web browser from asking “stupid” questions about the validity of a certificate, you must pay a company, called a Certificate authority, such as Verisign, Geotrust, or Thawte, for the added simplicity. That company will then verify that you are who you are (in theory, at least) and then sign your public key with their certificate. Their certificate is already bundled with most browsers and thus trusted by default, which also makes your newly signed certificate trusted as well.

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Creating a RAID array out of cheap USB disks

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A RAID array is a bunch of disks used together in co-operation to create a redundant storage facility. Hard drives are mechanical devices with moving parts, which makes them prone to failure. You can imagine what it means to spin the hard drive platters at 7200 rpm, for years without a pause in a typical server setup. Eventually, all disks die. A disk may run for a decade without a hinge, but another disk of the same type may die after a year. The problem is, there is reliable way to predict when a particular disk dies.

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Starting and stopping IBM Websphere MQ on a Redhat Enterprise Linux box

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Here’s a little script I made for starting and stopping Websphere MQ on a RHEL 4. It is useful for a simple configuration with one Queue Manager and listener. Just put your queue manager name in the QMGR variable and the listener port to the PORT variable, and save the script to your /etc/init.d.

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