Exercises, examples and other material relating to training module A163. This topic is presented on public courses Deploying LAMP - Linux, Apache, MySQL, Perl/PHP
, Linux Administration
, Deploying Java Applications on Linux / Unix
, Linux bootcamp
If you're running a network server, you need to configure your network. This module shows you how to do so under Linux, and to test that connection.
Related technical and longer articlesFirewall fundamentals - Linux
|Articles and tips on this subject||updated|
|11||A bolt of lightning on Multicasting|
When I learnt about TCP/IP, Multicasting was a bit of a footnote in the appendix. I can appreciate that for broadcast / streaming applications it could have its use but ... in my day-to-day stuff I didn't expect to see it used "in anger". Then today I was watching a customer rebuilding 26 machines ...
|3448||Checking all the systems on a subnet, using Expect and Tk|
There are times that we want to check the connectivity of all the systems on our subnet - to see which machines are present, and which are not. Pinging them one at a time is a bit slow, but pinging them all at once in a simple script sets up too many connections and the script is likely to fall over. ...
|2489||Parallel Pinging, using Python Threads or Expect spawn lists|
Ping is a very useful command to use within scripts for checking the presence (or absence) of a live system on our network, or indeed on the Internet. However, there are subtle differences in the format of its report on different operating system flavors, so any code that you write that needs to analyse ...
|332||Looking up IP addresses|
Browsers, mail clients, ftp and ssh and telnet clients and the rest are for ever converting fully qualified names such as www.sheepbingo.co.uk into IP addresses such as 126.96.36.199. How can you do such a lookup manually?
Firstly, there are numerous web sites out there that will help you - I'm not ...
|2052||How was my web site compromised?|
It looks to me as if this car has left the road and come to a sudden halt against the building, with the result that both have been somewhat damaged. But why did it happen? Was there a mechanical failure such as brakes or tyres? Did the driver fall asleep at the wheel or something distract him? ...
|1904||Ruby, Perl, Linux, MySQL - some training notes|
We have just come to the end of a solid 12 days of training ... and we are just getting ready for the next week, with delegates arriving this evening. There's a lot going on behind the scenes, even over this weekend, with the hotel to be prepared as well as the training course. (Picture - our clean ...
|1712||As different as night and tyres|
I was going to say "as different as night and day" - but they're really too similar! You'll be reading this forum post on our new server, and I'm already seeing a dramatic improvement in performance - partly related to the heavy load on the previous server, partly because the previous server wasn't ...
|1666||Slow boot and terminal start on Linux boxes|
Now this was a mystery. I had two Linux boxes which booted perfectly when used inhouse, but very slowly indeed (10 minutes plus) when in use on a customer site. Very awkward really - we would test out the systems in Melksham and find them fine, but then they would fail in Bristol. Even calling up ...
|1408||Wireless hotel tips - FTP and Skype connections failing|
I'm on line this week through a Spectrum interactive account, who's web site tells me that they have won a contract to supply BAA at Heathrow Terminal 5 and that they have an exclusive 7 year deal at Travelodge, where I have been staying. It's not all been a bed of roses - quite apart from a major loss ...
|1073||Heartbeat script in Perl|
Scenario ... an Apache httpd web server is distributing requests around between a number of Apache Tomcat instances on different computers (perhaps using mod_rewrite to allocate the requests). If a Tomcat instance become unavailable (i.e. if the host running it is taken offline) then it's to be removed ...
|506||What are DHCP and DNS?|
Are they the same thing? Absolutely not, though both relate to resolving addresses on a network.
You can use DHCP (Dynamic Host Configuration Protocol) when you connect your client computer onto a network that it's not been pre-configured for. All computers on an IP network need to know:
a) an available ...
|511||Domain Forwarding - 2 ways of doing it|
It's always seemed to be a real hassle to move domains and DNS service from one ISP to another, and I think that's partly because the ISP that you're leaving might not want to loose business, and partly because of necessary security checks to avoid domains being stolen. But it's lead us to some interesting ...
|267||Searching security holes|
You'll see from my post earlier this morning that I've added some "Out and about in Wiltshire" pages to our shared data system (Also known as a "wiki") on this site. And, I thought, "what better opportunity than to extend our site's search engine to include the database of information in that system?"
Examples from our training material
|hosts|| Archived /etc/hosts file|
Some modules are available for download
as a sample of our material or under an Open Training Notes License
for free download from http://www.training-notes.co.uk
Topics covered in this module
IP addressing and DNS naming.
Putting your Linux system on a network.
Testing with ping.
Using outgoing services.
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