Unless you need certification for career development purposes, I would focus more on gaining the practical knowledge needed to manage your operations. With Red Hat training and certification, there is a lot of information that you will never use in managing web operations.
So instead of certification routes, I would look for specific resources.
I would setup a development system that is a clone of your production environment and use it for testing and training.
Key areas you need to manage web ops:
Apache Configuration, Diagnostics, Performance Tuning
MySQL - Table repair, backup/restore, performance tuning
PHP - Configuration management, PECL/PEAR add-ons, OpCode Caches, Performance tuning
OS - Patch management, resource monitoring, logging
- Security - Basic firewall (iptables), ssh, network and process reporting basics
There is far more but this is a check list we use when hiring new sysadmins to support our clients who run various web operations.
With the certification route, you may find some of these topics are lightly covered or delayed to an advanced course. So may be better just to pick and choose the topics you need.
For a high level overview of web ops, take a look at:
Not a "how to do" book but will give you a good ideal of the scope of what web ops management entails. You can then pick the parts you want to take on yourself and outsource the rest.