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APC INFO Monitor

How to Configure APC Cache on Virtual Servers with PHP running under FCGId

…ExecCGI FollowSymLinks Includes IncludesNOEXEC -Indexes MultiViews SymLinksIfOwnerMatch RemoveHandler .php RemoveHandler .php5 IPCCommTimeout 12 You must “babysit” the configuration: use the APC monitor (apc.php) to see how many files are being cached, and how much memory (apc.shm_size) is needed to avoid fragmentation, which will cause the 500 errors. If fragmentation rises quickly to 100%, memory usage […]

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WordPress with W3 Total Cache on Nginx with APC (Virtualmin)

…php-fastcgi, each virtual domain will load its own php.ini file, so you can add the APC directives to that file (/home/domainname/etc/php5/php.ini) Add the following to php.ini (adjust to your requirements) [APC] extension = apc.enabled = 1 apc.shm_segments = 1 apc.shm_size = 12M apc.optimization = 0 apc.num_files_hint = 256 apc.user_entries_hint = 1024 apc.ttl = 0 […]

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APC INFO Monitor

APC Cache Considerations for Virtual Hosting Environments

…irtual server. However with 200+ virtual hosts all running PHP script packages, as is the case with a commodity shared hosting server, this will use a lot of memory, and you will need somewhere in the neighborhood of 10-30GB apc.shm_size if you attempt to configure a single APC cache for the entire server. My web […]

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Tuning Apache and MySQL for Best Performance in a Shared Virtual Hosting Environment

…of maxclients, and from this you will know the appropriate beginning value for [mysqld] max_connections. Begin with max_connections set slightly higher than Apache’s maxclients. If you are running database caching via APC, you may lower max_connections, because APC will serve the busiest queries directly from cache. Take Time to Get a Realistic Assessment of MySQL […]

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Apache and MySql Performance Tuning for High Traffic WordPress Website on Cpanel

…he publisher after responding to a plea for assistance in a support forum. Though the site was running on a dedicated server with 8GB RAM, it was crashing frequently under load. The developer tried implementing APC Alternative PHP Cache and W3 Total Cache, but these measures turned out to be incompatible with some of […]

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Varnish VCL and Config for WordPress with W3 Total Cache

I have been working on a Varnish front-end for Apache, to be used with WordPress sites. I described the architecture in Load Balancing Virtualmin WordPress Hosting Server with Varnish on AWS. I now have a configuration that seems to work for all WordPress features, including logged-out commenting. This configuration also works well with W3 Total […]

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Fail2Ban Regex for RedHat, Fedora, CentOS and Amazon Linux 2013

…e’s a substitute, created via experimentation with RegExr: failregex = .*auth.*pam.*dovecot.*(?:authentication failure).*rhost=.* How to create a valid RegEx to match the failures to ban? For that, one must monitor log files. In the case of Dovecot on Amazon Linux 2013, that would be /var/log/secure — same as it has ever been with RedHat downstreams. However, […]

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Chris Gilligan Web Developer, Information Architect, Web Server Administrator, Media Producer web • video • print I design and produce information and communication media for university, corporate, small business, manufacturing and non-profit clients: web sites Information architecture and design for open source content management systems Front-end UI design, HTML, PHP, LESS Linux Apache […]

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