Author: dpepper

Varnish is a web accelerator, specifically a caching HTTP reverse proxy, designed to improve performance for busy, dynamic websites. By redirecting traffic to static pages whenever possible, Varnish reduces the number of dynamic page calls, thus reducing load.

Pre-Flight Check

• These instructions are intended specifically for installing XCache, an open-source opcode caching tool, on Fedora 23. To install XCache on another operating system, follow our guides for CentOS 7, Ubuntu 14.04 LTS, and Ubuntu 15.04.
• We’ll be logging in as a non-root user to a Liquid Web Self-Managed Fedora 23 server. If you need more information then visit our tutorial on How to Add a User and Grant Root Privileges on Fedora 23.

Preflight Check

• These instructions are intended specifically for solving the error: “sec_error_ocsp_try_server_later”.
• This error can be displayed anytime a user visits a secure website using the https:// protocol in Firefox or Internet Explorer. It does not indicate a problem with the site itself, but occurs due to a change in the method these specific browsers used to check for revoked SSL certificates.
• We’ll be logging into WebHost Manager as root to resolve the error.

The Google Security Team and Red Hat have discovered a flaw in the way that certain types of DNS lookups are handled on some Linux servers. By exploiting this critical vulnerability, an attacker could gain full control over the system.

Memcached is a high-performance distributed, in-memory caching system. It primarily is used to speed up sites that make heavy use of databases. It also can, however, be used to store any kind of object.

Squid is a caching and forwarding web proxy. It is most often used in conjunction with a traditional LAMP stack (Linux, Apache, MySQL, PHP), and can be used to filter traffic on HTTP, FTP, and HTTPS, and increase the speed (thus lower the response time) for a web server via caching.

PostgreSQL is a free, open-source object-relational database management system (object-RDBMS), similar to MySQL, and is standards-compliant and extensible. It often is used as a back-end for web and mobile applications. PostgreSQL, or ‘Postgres’ as it is nicknamed, adopts the ANSI/ISO SQL standards together, with the revisions.

Pip is a tool for installing and managing packages for Python. The popular Python programming language is considered one of the easiest to learn because of its emphasis on code readability.

The locate command is an invaluable tool when you’re trying to track down a particular file but know only the file name. Locate reads one or more databases prepared by the related updatedb and writes file names matching at least one of the patterns to standard output, one per line.

PhpMyAdmin is an open-source tool used for the administration of MySQL. In addition to offering the capability to perform administrative tasks such as creating, editing, or deleting databases, and managing users and permissions, PhpMyAdmin provides a graphical user interface to do all of these tasks and more.