How to List Which Apache 2 Modules are Enabled on CentOS 7

The Apache web server is one of the most popular and powerful web servers in the world due to its ease of administration and flexibility. This flexibility comes Apache’s modular design, and allows for such features as: URL rewriting for SSL encryption natively, and Outlook Anywhere passthrough support in reverse proxy setups. Modularity allows Administrators to modify Apache to meet their needs; adding modules that are needed and removing ones that are not. Here we’ll be working with Apache on CentOS 7.

Pre-Flight Check
  • These instructions are intended specifically for viewing which Apache modules are enabled on CentOS.
  • I’ll be working from a Liquid Web Core Managed CentOS 7 server with Apache 2 installed, and I’ll be logged in as root.

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How to Install the Open Query Graph engine (OQGRAPH) for MariaDB 10.0 on CentOS 7

MariaDB is a drop-in replacement for MySQL. It is easy to install, offers many speed and performance improvements, and is easy to integrate into most MySQL deployments. Answers for compatibility questions can be found at: MariaDB versus MySQL – Compatibility. MariaDB offers more storage engines than MySQL, including Cassandra (NoSQL), XtraDB (drop-in replacement for InnoDB), and OQGRAPH.

Pre-Flight Check
  • These instructions are intended for installing the Open Query Graph engine (OQGRAPH) for MariaDB 10.0 on CentOS 7.
  • I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.
  • Your server should already have MariaDB 10.0 installed. If you’re working from MariaDB 5.5 visit our tutorial on: How to Upgrade MariaDB 5.5 to MariaDB 10.0 on CentOS 7

Continue reading “How to Install the Open Query Graph engine (OQGRAPH) for MariaDB 10.0 on CentOS 7”

How to Install the Cassandra Storage Engine for MariaDB 10.0 on CentOS 7

MariaDB is a drop-in replacement for MySQL. It is easy to install, offers many speed and performance improvements, and is easy to integrate into most MySQL deployments. Answers for compatibility questions can be found at: MariaDB versus MySQL – Compatibility. MariaDB offers more storage engines than MySQL, including Cassandra (NoSQL), XtraDB (drop-in replacement for InnoDB), and OQGRAPH.

Pre-Flight Check
  • These instructions are intended for installing the Cassandra Storage Engine for MariaDB 10.0 on CentOS 7.
  • I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.
  • Your server should already have MariaDB 10.0 installed. If you’re working from MariaDB 5.5, visit our tutorial on: How to Upgrade MariaDB 5.5 to MariaDB 10.0 on CentOS 7

Continue reading “How to Install the Cassandra Storage Engine for MariaDB 10.0 on CentOS 7”

How to Install Varnish 4 on CentOS 7

Varnish is a proxy and cache, or HTTP accelerator, designed to improve performance for busy, dynamic web sites. 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 the Varnish on CentOS 7.
  • I’ll be working from a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.

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How to Upgrade MariaDB 5.5 to MariaDB 10.0 on CentOS 7

MariaDB is a drop-in replacement for MySQL installed by default on CentOS 7, and offers many speed and performance improvements. MariaDB offers more storage engines than MySQL, including Cassandra (NoSQL), XtraDB (drop-in replacement for InnoDB), and OQGRAPH.

Pre-Flight Check
  • These instructions are intended for upgrading from MariaDB 5.5 to MariaDB 10.0 on CentOS 7.
  • I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.

Continue reading “How to Upgrade MariaDB 5.5 to MariaDB 10.0 on CentOS 7”

How To Install Cassandra on CentOS 7

Apache Cassandra is a NoSQL database intended for storing large amounts of data in a decentralized, highly available cluster. NoSQL refers to a database with a data model other than the tabular relations used in relational databases such as MySQL, PostgreSQL, and Microsoft SQL.

Pre-Flight Check
  • These instructions are intended for installing Cassandra 2 on a single CentOS 7 node.
  • I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.
  • You may be able to skip to Step #2 if you already have a stable version of Java 7 (preferably the Oracle/Sun JVM). Check to see if your server already has Java installed by running the following command: java -version
  • Continue reading “How To Install Cassandra on CentOS 7”

Error: Failed to connect to ‘127.0.0.1:7199’: Connection refused (Cassandra) [SOLVED]

Pre-Flight Check
  • These instructions are intended specifically for solving the error: Failed to connect to ‘127.0.0.1:7199’: Connection refused.
  • I’ll be working from both Liquid Web Core Managed CentOS 6 and CentOS 7 servers, and I’ll be logged in as root.

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chkconfig Command Examples for Red Hat and CentOS

chkconfig is a command for checking and updating runlevel information for system services. For a primer on runlevels, check out our tutorial: Linux Runlevels Explained.

Pre-Flight Check
  • These instructions are intended specifically for checking and updating chkconfig.
  • I’ll be working from both a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.

Continue reading “chkconfig Command Examples for Red Hat and CentOS”

How to Install lsyncd on CentOS 7

lsyncd is an rsync-based tool that monitors specified directories (including subdirectories) for updates and modifications, then syncs those changes to a specified destination.

Pre-Flight Check
  • These instructions are intended specifically for installing the lsyncd on CentOS 7.
  • I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.

Continue reading “How to Install lsyncd on CentOS 7”