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Mastering JIRA 7 - Second Edition
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You should expect issues in the upgrade process, and for this reason, follow these steps:
Always perform a backup of your JIRA installation directory, JIRA home directory, and your database before upgrading.
There are several different ways to upgrade JIRA. The method you choose to use depends on the version of JIRA you use and the type of environment you use it in.
When JIRA is used in companies where it's mission-critical for the business, then it's recommended to use this method because it will let you roll back safely to your previous working version. Prepare the production instance as follows:
Refer to https://confluence.atlassian.com/display/JIRA/Upgrading+JIRA+with+a+Fallback+Method for further information on upgrading JIRA using a fallback method.
If you can afford to have a downtime of several minutes and there is no impact on the business due to the downtime, then it's recommended to use this method, which is quite easy. It just needs you to run the installer again on top of the existing installed application:
If you have made any changes in some of the files (such as setenv.bat) or have your own CSS and JavaScript files or codes, then you need to redo those changes again in the upgraded system.
Refer to https://confluence.atlassian.com/display/JIRA/Upgrading+JIRA+Using+a+Rapid+Upgrade+Method for further information on upgrading JIRA using an RAD method.
With the rapid method, you can easily upgrade JIRA. However, there are certain cases where you cannot use the installation binary. For example, if you want to install JIRA on Solaris, then there are no supported binaries from Atlassian, but you can use the following method with the Web Application Archive (WAR) distribution file to install JIRA on Solaris:
Refer to https://confluence.atlassian.com/display/JIRA/Upgrading+JIRA+Manually for further information on upgrading JIRA manually.
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