A challenge I faced recently was "scaling up on demand" (without manual intervention). EC2 was the my platform of choice because I could write a small script to manage all my machines. EC2 being Xen based also allowed me to create custom images of my application servers.
- Hook into the load balancer's health monitor
- If the load goes over 70% launch a new ec2 instance
- If the load goes under 50% remove an instance
Example:
- @ 7am - 2 servers
- @ 1pm - 4 servers
- @ 6 pm - 3 servers
- @ 9 pm - 2 servers
I have a base of 2 machines, and no real limit set to the maximum number of ec2 machines that can launched. The script is set to send me a mail every time a new machine is launched or terminated.
Now I am trying to automate creation of MySQL Slaves
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That's really cool! What
That's really cool! What site are you using this on, can you share the script?
Would you mind posting
Would you mind posting samples of the scripts? I am sure that others (like me) would find them useful.
Thanks!
where is your load balancer
where is your load balancer in this scenario? another EC2 box? or did you rent/host a hardware load balancer somewhere nearby?
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