System requirements

Just like any other software application, a set of base requirements needs to be met before you can install and run JIRA. Therefore, it is important for you to be familiar with these requirements so that you can plan out your deployment successfully. Note that these requirements are for a behind-the-firewall deployment, also known as the JIRA Server. Atlassian also offers a Cloud-based alternative called JIRA Cloud, available at https://www.atlassian.com/software#cloud-products.

The cloud version of JIRA is similar to the behind-the-firewall JIRA deployment in most areas, and it is perfect for organizations that do not want to have the overhead of the initial setup and just want to get up-and-running quickly. One major limitation of JIRA Cloud is that you cannot use many of the third-party add-ons available. If you want to have all the power and flexibility of the JIRA Server and worry-free server management, you may consider managed hosting for JIRA offered by third-party vendors.

Hardware requirements

For evaluation purposes, where there will only be a small number of users, JIRA will run happily on any server that has a 1.5 GHz processor and 1 GB to 2 GB of RAM. As your JIRA usage grows, a typical server will have a quad core 2 GHz CPU and 4 GB of RAM dedicated to the JIRA application.

For production deployment, as in most applications, it is recommended that you run JIRA on its own dedicated server. There are many factors that you should consider when deciding the extent of the resources to allocate to JIRA; keep in mind how JIRA will scale and grow. When deciding on your hardware needs, you should consider the following:

• The number of active users in the system
• The number of issues and projects in the system
• The number of configuration items such as custom fields and workflows
• The number of concurrent users, especially during peak hours

It can be difficult at times to estimate these figures. As a reference, a server running with over 2.0 GHz of dual/quad CPU and 2 GB of RAM will be sufficient for most instances with around 200 active users. If you start to get into thousands of active users, you will need to have at least 8 GB of RAM allocated to JIRA (JVM).

Officially, JIRA only supports x86 hardware and 64-bit derivatives of it. When running JIRA on a 64-bit system, you will be able to allocate more than 4 GB of memory to JIRA, the limit if you are using a 32-bit system. If you are planning to deploy a large instance, it is recommended that you use a 64-bit system.

Software requirements

JIRA has four requirements when it comes to software. It needs a supported operating system and a Java environment. It also needs an application server to host and serve its contents and a database to store all of its data. In the following sections, we will discuss each of these requirements and the options that you have to install and run JIRA. You can find the latest information online at https://confluence.atlassian.com/adminjiraserver071/supported-platforms-802592168.html.

Operating systems

JIRA supports most of the major operating systems, so the choice of which operating system to run JIRA on becomes a matter of expertise, comfort, and in most cases the existing organization's IT infrastructure and requirements.

The operating systems supported by Atlassian are Windows and Linux. There is a JIRA distribution for Mac OSX, but it is not officially supported. With both Windows and Linux, Atlassian provides an executable installer wizard package, which bundles all the necessary components to simplify the installation process (only available for standalone distribution).

There are minimal differences when it comes to installing, configuring, and maintaining JIRA on different operating systems. If you do not have any preferences and would like to keep the initial cost down, Linux is a good choice.

Java platforms

JIRA is a Java-based web application, so it needs to have a Java environment installed. This can be a Java Development Kit (JDK) or a Java Runtime Environment (JRE). The executable installer that comes with Windows or Linux contains the necessary files and will install and configure the JRE for you. However, if you want to use archive distributions, you will need to make sure that you have the required Java environment installed and configured.

JIRA 7 requires Java 8. If you run JIRA on an unsupported Java version, including its patch version, you may run into unexpected errors. The following table shows the supported Java versions for JIRA:

Java platforms	Support status
Oracle JDK/JRE	Java 8 (1.8)

Databases

JIRA stores all its data in a relational database. While you can run JIRA with HyperSQL Database (HSQLDB), the in-memory database that comes bundled with JIRA, it is prone to data corruption. You should only use this to set up a new instance quickly for evaluation purposes, where no important data will be stored. For this reason, it is important that you use a proper database such as MySQL for production systems.

Most relational databases available on the market today are supported by JIRA, and there are no differences when you install and configure JIRA. Just like operating systems, your choice of database will come down to your IT staff's expertise, experience, and established corporate standards. If you run Windows as your operating system, then you might probably want to go with the Microsoft SQL Server. On the other hand, if you run Linux, then you should consider Oracle (if you already have a license), MySQL, or PostgreSQL.

The following table summarizes the databases that are currently supported by JIRA. It is worth mentioning that both MySQL and PostgreSQL are open source products, so they are excellent options if you are looking to minimize your initial investments.

Database	Support status
MySQL	MySQL 5.1 and newer This requires the latest JDBC driver
PostgreSQL	PostgreSQL 9.0 and newer This requires the latest PostgreSQL driver
Microsoft SQL Server	SQL Server 2008 and newer This requires latest JTDS driver
Oracle	Oracle 12C This requires the latest Oracle driver
HSQLDB	This is bundled with the standalone distribution, for evaluation only

Take a special note of the driver requirement on each database, as some drivers that come bundled with the database vendor (for example, the SQL Server) are not supported.

Application servers

JIRA 7 officially only supports Apache Tomcat as the application server. While it is possible to deploy JIRA into other application servers, you will be doing this at your own risk, and it is not recommended.

The following table shows the versions of Tomcat supported by JIRA 7:

Application server	Support status
Apache Tomcat	Tomcat 8.0.17 and newer By default, JIRA 7 ships with 8.0.17, so it is recommended that you use that version or newer.