Steps for Upgrading Zabbix Minor Version

1. Download latest source from www.zabbix.com
2. Installation Manual for 1.8 http://www.zabbix.com/documentation/1.8/manual/installation/installation_from_source
3. service zabbix-server stop
4. service zabbix-agentd stop
5. tar xvf zabbix-1.8.6.tar.gz
6. cd zabbix-1.8.6
7. ./configure --enable-server --enable-agent --with-mysql --with-net-snmp --with-libcurl
8. make install
9. cp /usr/local/sbin/zabbix* /sbin
10. cd frontends
11. cp php /var/www/html/php -R
12. cd /var/www/html
13. mv zabbix zabbix185
14. mv php zabbix
15. chown apache.apache zabbix -R
16. http://<servername>/zabbix to run the setup and finish