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Is there any software or way to predict system resource need by taking several inputs such as MySQL query read/write ratio, queries executed in a second, properties of tables and databases, maybe some more inputs related with PHP configurations etc. ?
Yes. I know there is probably no perfect solution a software can provide me but I’m not looking for a perfect solution.
A few tools that may come in handy:
AWS Cloudwatch, but will work only with EC2. Setup an alarm, say for CPU utilization, so the moment you exceed, say 75%, an alarm email or sms will be sent to you, so you can look around accordingly.
AWS Elsatic Load Balancer, will help you to further distribute the traffic, releasing the unhealthy instance and routing the traffic to a healthier server.
Some monitoring tools like… missing on the names… but if you can take care of things with a self monitoring way, when we use a control panel like webmin, you can get the details of CPU Usage, RAM usage, storage, etc…
And lastly, just a concept, but will take a lot to complete, and I will follow what algolicious just stated above, create a mathematical model which can work on cron, so every 5 mins the observation can be recorded, and action be taken when required.