Question

I’m creating an game server list, and I want to measure uptime for certain server (to be specific, uptime should be displayed in percents).

I have configured a cronjob for my script, which is checking every 5 minutes if server is up or down, so I can easly get the server status.

I need an idea on how can I measure each server uptime basing on the above data. I’d have to save down and up time for each server every one minute the script is executing?

Answer 1

If you don’t care about many details and you just want the up and down time. Then you could save 2 numbers in a file, one being the current percentage and the other being the current number of measures the script took.

For example: ’96 800′.

Then, whenever the script is executed, use this formula, assuming that the percentage (96) is X, the number of saves is Y (800) and the current measure is Z (0 or 1)

X=X/100;
X=(X*Y+Z)/(Y+1);  //You get the new value of the percentage, X. Be careful as they need to be long values.
Y=Y+1;    //And the current number of interactions.
X=X*100;

That’s of course just pseudo code and won’t work straight away, it’s just to give you an idea of one way to do it. You must also include a way of reading a file and saving it wherever you want of your page that contains those 2 numbers.

As Jamie stated, this is assuming that crontime is still working despite of the server is down.

PS, you could also add a system from other server to check this server uptime, but it would need to be statistically calculated (and error tends to 0 when many other servers are added, but that’d be too difficult) as you’d need to take into account the other server’s uptime also…