Category: Architecture

Typical migration plan for small single server web service to new server

1. Pre-configuration step (Instalation) Prepare fresh OS install with latest updates Prepare OS configuration with new DC specification (ldap, monitoring, backup, syslog, automation provisioning, update, deploy, security fixes etc …) Install nginx, httpd, php, mysql Prepare nginx proxy configuration in disable mode Setup Master-Master MySQL replication from old to new server with global read only […]

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Simple failover schema for 4 servers

Here is simple failover schema for 4 servers with 2 active web nodes and frontend/backend architecture, MySQL replication, NFS and DRBD active-passive mode. http://my.itwnik.com/wp-content/uploads/2012/04/Simple-Failover-Schema-4S1.png I must admit that this architecture build on compromise of availability and performance. If you’d like to have better performance please avoid shared data. For example: use can use CDN for […]

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