Configure Jira with Apache2 Mod_proxy

gistfile1.txt

Insert following in file /opt/atlassian/jira/conf/server.xml
below the main connector
<Connector acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" enableLookups="false" maxHttpHeaderSize="8192" maxThreads="150" minSpareThreads="25" port="8080" protocol="HTTP/1.1" redirectPort="8443" useBodyEncodingForURI="true" 
            proxyName="jira.atlassian.com" proxyPort="80"/>

Restart Jira: 
sudo service jira stop
sudo service jira start
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Insert in /etc/apache2/sites-enabled/000-default.conf
inside <VirtualHost *:80> tag

<Proxy>
   Require all granted
</Proxy>
ProxyRequests Off
ProxyPreserveHost On
ProxyPass / http://localhost:8080/
ProxyPAssReverse / http://localhost:8080/

Restart apache: Sudo service apache2 restart
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In case mod_proxy is not install or enabled Please do the following

Step 1: Install the module
  sudo apt-get install libapache2-mod-proxy-html
Step 2: Installing the dependency libxml2-dev
  apt-get install libxml2-dev
Step 3: Load the module
  a2enmod proxy proxy_http
apt-get install libxml2-dev

Restart apache: Sudo service apache2 restart

For Confluence please read this article: https://confluence.atlassian.com/doc/using-apache-with-mod_proxy-173669.html