Nginx and Memcached - September 2014

http://memcached.org

On Oct 2, 2014, I installed Memcached.
@apt-get install memcached@

The above installed version 1.4.13.

As of Oct 20, 2014, the latest stable memcached release is v1.4.21.


/etc/memcached.conf

listens on port 11211


http://wiki.nginx.org/HttpMemcachedModule

http://nginx.org/en/docs/http/ngx_http_memcached_module.html

https://www.igvita.com/2008/02/11/nginx-and-memcached-a-400-boost/

http://blog.octo.com/en/http-caching-with-nginx-and-memcached/

http://stackoverflow.com/questions/5150995/how-to-configure-nginx-with-memcached-to-serve-html

https://wildlyinaccurate.com/blazing-fast-wordpress-with-nginx-and-memcached


h2. enhanced module:

https://github.com/bpaquet/ngx_http_enhanced_memcached_module


h2. Perl Clients

Pure Perl:
Cache::Memcached 
http://search.cpan.org/~dormando/Cache-Memcached-1.30/lib/Cache/Memcached.pm

hr.

Perl client written in C:
Cache::Memcached::Fast 
http://search.cpan.org/~kroki/Cache-Memcached-Fast-0.22/lib/Cache/Memcached/Fast.pm

*Installed on Oct 20, 2014*
perl -MCPAN -e 'install Cache::Memcached::Fast'


hr.

http://search.cpan.org/~mdorman/Memcached-Client-2.01/lib/Memcached/Client.pm

install failed

hr.

http://search.cpan.org/~elizabeth/Cache-Memcached-Managed-0.24/lib/Cache/Memcached/Managed.pm

*Installed on Oct 20, 2014*
perl -MCPAN -e 'install Cache::Memcached::Managed'

that install managed to install Cache::Memcached.


hr.

http://search.cpan.org/dist/Cache-Memcached-libmemcached/lib/Cache/Memcached/libmemcached.pm

*Installed on Oct 20, 2014*

perl -MCPAN -e 'install Cache::Memcached::libmemcached '


h2. docs

https://code.google.com/p/memcached/wiki/NewProgramming

https://github.com/memcached/memcached/blob/master/doc/protocol.txt

https://code.google.com/p/memcached/wiki/NewCommands

http://lzone.de/articles/memcached.htm

http://skipperkongen.dk/2013/01/21/summary-of-memcached-commands-as-used-through-telnet/

*[X]* http://www.journaldev.com/16/memcached-telnet-commands-with-example

*[X]* http://blog.elijaa.org/index.php?post/2010/05/21/Memcached-telnet-command-summary

For my new uses, I think Redis will be easier. Redis allows a hash type, so that I can purge the entire cache for a top level domain. And since I host multiple websites on the same server and store those sites' content in the same Redis server, it's easier to remove the cache for one site within Redis.

Within Memcached, I could store key-value data like this:
birdbrainsbrewing.com-1 "html content for page id 1"
birdbrainsbrewing.com-5 "html content for page id 5"
maketoledo.com-1 "html content for page id 1"

But I cannot determine how to remove all the keys for one domain. For Redis, I delete the hash birdbrainsbrewing.com and all those cache pages are removed.

At the moment, it seems that I can only delete one key at a time for Memcached. A flush_all command will remove the entire cache. That's fine if I only hosted one site within Memecached.

For Memecached, I need to run the server for each site, and then specify the port number within my Grebe YAML config file. 

Then key-value would be simply:
1 'html for page id 1'
2 'html for p


 #nginx  - #memcached  - #cache - #scalability