Skip to main content

Squid proxy server

My job title is "PHP developer" but because I'm the only person in the office familiar with Linux I get roped into administering the LAMP stack and other systems roles.

Yesterday I was asked to investigate methods of monitoring individual bandwidth use. I've installed Squid proxy server so that all traffic is getting routed through my pet Linux box that I keep spare just for such occasions.

Right, now I'm asked to install software to filter out sites not related to work (like OkCupid... uhoh). So I find a program that slots into Squid and install it.

Bang! Facebook and all other sites mysteriously get replaced with a kitten (from icanhazcheeseburger.com) chewing network cables captioned as "Ohnoes!!!1 kitty is eating my megahurtz!". Putting me in charge results in silliness. I hope they do it less often.

Anyway, despite my best efforts to make the access denied picture cute and adorable my users still hate me. It's tough being a webslave.

A little Linux server does an admirable job of a proxy server, local intranet server, firewall, and virus scanner. My pet Linux box was resurrected from our office "graveyard" because it was old, delapidated, and useless as a development server. Our developers use Microsoft products which require modern computers. I installed Ubuntu onto this box that Microsoft says is useless and now its running a production website, a local intranet, handling our proxy, caching our DNS, scanning traffic with Clam, filtering sites, and our users have commented that our internet is faster than it used to be. I didn't have to pay for any of the software or buy new hardware. Crazy monkey man would be sorely disappointed.

PS: If icanhazcheeseburger.com asks I'll happily remove their image. I hope that linking and crediting is good enough.

Comments

Popular posts from this blog

Using Fail2Ban to protect a Varnished site from scrapers

I'm using Varnish to cache a fairly busy property site.  Varnish works like a bomb for normal users and has greatly improved our page load speed. For bots that are scraping the site, presumably to add the property listings to their own site, though the cache is next to useless since the bots are sequentially trawling through the whole site. I decided to use fail2ban to block IP's who hit the site too often. The first step in doing so was to enable a disk based access log for Varnish so that fail2ban will have something to work with. This means setting up varnishncsa.  Add this to your /etc/rc.local file: varnishncsa -a -w /var/log/varnish/access.log -D -P /var/run/varnishncsa.pid This starts up varnishncsa in daemon mode and appends Varnish access attempts to /var/log/varnish/access.log Now edit or create /etc/logrotate.d/varnish and make an entry to rotate this access log: /var/log/varnish/*log { create 640 http log compress ...

Translating a bit of the idea behind domain driven design into code architecture

I've often participated in arguments discussions about whether thin models or thin controllers should be preferred.  The wisdom of a thin controller is that if you need to test your controller in isolation then you need to stub the dependencies of your request and response. It also violates the single responsibility principal because the controller could have multiple reasons to change.   Seemingly, the alternative is to settle on having fat models. This results in having domain logic right next to your persistence logic. If you ever want to change your persistence layer you're going to be in for a painful time. That's a bit of a cargo cult argument because honestly who does that, but it's also a violation of the single responsibility principal.   One way to decouple your domain logic from both persistence and controller is to use the "repository pattern".   Here we encapsulate domain logic into a data service. This layer deals exclusively with imple...

Grokking PHP monolog context into Elastic

An indexed and searchable centralized log is one of those tools that once you've had it you'll wonder how you managed without it.    I've experienced a couple of advantages to using a central log - debugging, monitoring performance, and catching unknown problems. Debugging Debugging becomes easier because instead of poking around grepping text logs on servers you're able to use a GUI to contrast and compare values between different time ranges. A ticket will often include sparse information about the problem and observed error, but if you know more or less when a problem occurred then you can check the logs of all your systems at that time. Problem behaviour in your application can occur as a result of the services you depend on.  A database fault will produce errors in your application, for example. If you log your database errors and your application errors in the same central platform then it's much more convenient to compare behaviour between...