Software. The main software components you need for a working LiveJournal installation are as follows (the recommended version is noted):
At this time, LiveJournal has not been ported to & will not work with Apache 2 & mod_perl 2.
Perl Module Dependencies. A complete list of modules need to run a LiveJournal installation can be found at Section 2: Installing Perl Modules. Some modules such as GD and Compress::Zlib require certain system libraries to be pre-installed on your machine in order to work. The author-provided README files for perl modules explain what is necessary.
Hardware. There are no specific hardware requirements for a LiveJournal installation, but Apache/mod_perl and MySQL can utilize a lot of memory very quickly. Determining the right amount of processor speed, storage space, and RAM depends on how busy your LiveJournal installation will be. A simple rule of thumb to remember is that posts and comments drive site traffic, not necessarily the presence of more users.