The ramblings of a computer geek
At least once a year in the UK on a Bank Holiday the film WarGames is shown, possibly the best film about computer hackers ever made, as the inspiration for films such as Hackers, Swordfish, Sneakers, The Net and others. The computers and technology in it may be dated but its still an excellent sci-fi … Read more
Visual Basic is a more complex and updated version of an old programming language known as BASIC. BASIC stands for Beginners All Purpose Symbolic Instruction Code. BASIC became popular as a simple high-level programming language due to its simplicity and its ease to learn, that why most people now probably learnt to program with BASIC. … Read more
Email is a tricky thing to do right, though a couple of simple tools can help you test your mail server before you start to use it, i.e. make sure mail can be delivered correctly to a users mailbox. Also it can help diagnosing certain problems that you might have with your email. POP – … Read more
On our Cisco 4500 series switches we could not see when ports where going up or down, even when using “terminal monitor.” We use this technique to identify ports and has been useful in our VLAN project. The problem was that on 4500 series switches, you need to manually enable this type of logging, to … Read more
Setting up a second exchange server in the same routing group, all installed fine, however, after moving a mailbox to the new server and then sending an email to the mailbox, the mail got stuck in the queue on the first server. Checked the common things like DNS, firewall ports etc. all looked fine. But … Read more
You can find a duplicate email address, by using Active Directory Users and Computers, then following this procedure: To search for a duplicate address do the following: Open Active Directory Users and Computers. Right click on your domain name and click on the “find” option. Then choose “custom search”. Then click on the “Advanced” tab. … Read more
I came into work this morning to a downed Exchange storage group and mail store. In the event log just after the backup ran i saw these string of events in the event log on the Exchange server. <em>Event Type: Error Event Source: ESE Event Category: General Event ID: 482 Date: 27/10/2010 Time: 21:00:34 User: … Read more
I’m still trying to get VMWare 3.5 installed completely and servers virtualised. But utlimately it would be nice to use vSphere4 in the end. Heres a good PDF showing the new features and how the licencing works (which has been made a bit more complicated! http://www.boche.net/blog/wp-content/uploads/2009/VsphereData.pdf
Find and replace with VI on a pathname is a bit tricky you ned to use escape characters. In this case /bin/mail should be replaced with /usr/bin/mail The command below would do it:
With Nagios using check_icmp is the way to go, it better and faster, below is an example configuration directive for setting the check-host-alive command which will be used by each host check.