To see all the installed packaged on your linux servers, you can do: dpkg -l which will list all installed packages on your web server. ...

If you have a website that uses a lot of API requests (such as dealing with Twitter), you can save a lot of server load/costs simply by installing DNS caching to your web server. Each DNS request (every time you request from any domain name using an API) takes anywhere between 0 to 500 miliseconds. ...

If your website does a lot of queries via domain names such as aggregating RSS feeds or even a Twitter app site that accesses Twitter API, you might benefit from installing DNS cache on your linux web server. For most, you would benefit from installing DNS cache because it will save you a ton of tim ...