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Object caching with Bedrock (and Trellis) using Redis

What is object caching

While nginx microcaching already solves page caching (as of static, rarely changing WordPress pages), the performance for dynamically generated pages (like WooCommerce shop pages and admin backend in general) can benefit greatly from additionally using an object cache. Object caching allows an application (in this case WordPress with its plugins, theme, etc.) to store prepared objects (mostly database queries) in a database and quickly retrieve them, therefore improving the performance of dynamic page generation. Object caching is (usually) transparent, which means that it shouldn't be noticeable by users and developers (except for the performance improvements of course).

Implementations

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How to setup SFTP Logging on Ubuntu 14.04 for a Chrooted User

Prerequisites: Using internal-sftp for sftp; rsyslog for logging

Step 1. Set up your chrooted directories

sudo mkdir /sftp/myshare
sudo mkdir /sftp/myothershare

Step 2. Create your groups for your chrooted users

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add_filter( 'post_type_link', 'my_post_type_link', 10, 3);
function my_post_type_link($permalink, $post, $leavename) {

	if  ($post->post_type == 'my-post-type') {
		$meta = get_post_meta($post->ID, '_my-post-meta', true);
		if (isset($meta) && !empty($meta)) 
			$permalink = home_url( "my-friendly-url/" . $meta . "/" . $post->post_name . "/");
	}

	return $permalink;

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# let's dig the server
dig example.com

# from the DNS answer we are interested in the authority section
#;; AUTHORITY SECTION:
#example.com.		79275	IN	NS	a.iana-servers.net.
#example.com.		79275	IN	NS	b.iana-servers.net.

# now we find out all subdomains
dig @a.iana-servers.net example.com axfr