jtheo » cache

Bookmarks for 17 nov 2011 from 23:06 to 23:56

jtheo — Thu, 17 Nov 2011 22:00:08 +0000

These are my links for 17 nov 2011 from 23:06 to 23:56:

Optimizing WordPress with Nginx, Varnish, APC, W3 Total Cache, and Amazon S3 (With Benchmarks) | danielmiessler.com – So I’ve spent the last couple of weeks tweaking my web server stack. I like my site to pop, and I’ve finally achieved a configuration that I’m somewhat happy with.
In sum, I’m running Varnish as a front-end to Nginx which is running WordPress loaded with the W3-Total-Cache plugin. The W3-Total-Cache plugin is configured to use both memcached as well as Amazon S3 as its CDN. All of this sits on Ubuntu Linux with Linode as my host.
A Varnish Primer | danielmiessler.com – Despite the title, this article has nothing to do with painting. Here I'm going to talk a bit about the Varnish Cache — a web application accelerator designed to dramatically improve how quickly your website loads. Varnish works by caching and serving as much content as possible as "static", including dynamic results, e.g. blog posts from a CMS like WordPress.
Varnish best practices « Kristian Lyngstol’s Blog – A while ago I wrote about common Varnish issues, and I think it’s time for an updated version. This time, I’ve decided to include a few somewhat uncommon issues that, if set, can be difficult to spot or track down. A sort of pitfall-avoidance, if you will. I’ll add a little summary with parameters and such at the end.
Cain Manor | Setup logging for Varnish – So far, we’ve got Varnish installed and have a correct default.vcl. Now let’s make sure AWStats/JAWStats can read them.
[Or http://www.hping.org/visitors/ ]

Bookmarks for 5 ott 2010 through 6 ott 2010

jtheo — Wed, 06 Oct 2010 15:00:39 +0000

These are my links for 5 ott 2010 through 6 ott 2010:

DNS e Postfix: come non generare "spam" | Kreations Collective – [...]Ho recentemente configurato alcuni server per l’invio di email. Parte del lavoro ha riguardato la corretta configurazione di Postfix e del server DNS per evitare che le email inviate venissero rilevate come spam.[...]

La configurazione ha riguardato tre punti principali:

Impostazione del record A e del reverse address

Impostazione di SPF

Configurazione di DKIM e DomainKeys

[...]
How to build your own CDN using BIND, GeoIP, Nginx, Varnish | UNIXy – In this article, we shall outline the steps required to build a private Content Delivery or Distribution Network (CDN) using a VPS with Varnish Cache and Nginx. The goal is to build a CDN using free, readily available software but most importantly spend the least amount of funds possible. To this end, all nodes participating in this network are going to be virtual machines (Xen, Virtuozzo, OpenVZ, etc). Should you have any questions or comments on the configuration of this CDN, please post them in this forum: http://www.varnish-cache.info/
Comandi testuali per i sistemi Windows – [...] Al lavoro, spesso mi capita di dover eseguire le stesse operazioni su più server, più volte alla settimana. La maggior parte di queste operazioni riguardano utilità di sistema di Windows, come la gestione utenti di Active Directory, o quella del DNS od altro ancora. Certo, un collegamento sul desktop è comodo, ma in talune situazioni può tornare decisamente comodo (e più veloce) conoscere il nome degli eseguibili relativi ad un determinato pannello MMC, piuttosto che l’apposita applicazione contenuta nel Pannello di Controllo.

Quello che segue è un elenco della maggior parte di questi comandi, tutti lanciabili direttamente dal pannello “Esegui” situato nello Start Menu di Windows. Alcuni di questi comandi possono essere distruttivi, portando addirittura alla formattazione del disco ed alla conseguente perdita di dati, per cui usateli solo se ritenete di essere in grado di farlo [...]

Bookmarks for 30 gen 2010 through 7 feb 2010

jtheo — Sun, 07 Feb 2010 12:01:14 +0000

These are my links for 30 gen 2010 through 7 feb 2010:

flashrom – flashrom is a utility for identifying, reading, writing, verifying and erasing flash chips. It's often used to flash BIOS/EFI/coreboot/firmware images.
via ossblog
glype proxy script – free anonymous proxies list – Glype proxy script is a free-to-use, web-based proxy script written in PHP. Similar to a typical proxy server, a web-proxy script downloads requested web pages and files and forwards them back to the user. The service is provided by a web page itself, which allows instant access to the proxy without editing your browser connection settings[...]
via .mau.
Repairing and re-registering the WMI – If you experience behavior when using WMI, such as application errors or scripts that used to work are no longer working, you may have a corrupted WMI repository. To fix a corrupted WMI repository, use these step…
Tuning the AIX file caches – Wikistix – By default, AIX is tuned for a mixed workload, and will grow its VMM file cache up to 80% of physical RAM. While this may be great for an NFS server, SMTP relay or web server, it is very poor for running any application which does its own cache management. This includes most databases (Oracle, DB2, Sybase, PostgreSQL, MySQL using InnoDB tables, TSM) and some other software (eg. the Squid web cache).
Common symptoms include high paging (high pgspin and pgspout in topas), high system CPU time, the lrud kernel thread using CPU, slow overall system throughput, slow backups and slow process startup.

For most database systems, the ideal solution is to use raw logical volumes. If this is not acceptable, then direct I/O and concurrent I/O should be used. If for some reason this is not possible, then the last solution is to tune the AIX file caches to be less aggressive