I’m currently working on a simple backup script and I wanted to make sure my backup server was up before I sent stuff from my laptop over to the backup server (which is housed here locally on a nice software RAID setup). It’s nothing ground breaking, but I couldn’t find a simple utility to simply ping a server, timeout gracefully and return a valid exit code. So, being the geek I am I made one.
<?php
$timeout = 5;
if (!isset($argv[1])) {
die("Usage: php -q server_status ipaddress:port [timeout]n");
} else {
list($server,$port) = explode(':',$argv[1]);
if (isset($argv[2]) && is_numeric($argv[2])) {
$timeout = $argv[2];
}
}
$fp = @fsockopen($server,$port,$errno,$errstr,$timeout);
if (!$fp) {
exit(1);
} else {
fclose($fp);
exit(0);
}
?>
If that script doesn’t work out because of php’s sometimes flaky socket handeling, you can try these:
ping
fping
nmap
ssh
All of them return a true or not true value.
Any of those would seem more reliable than PHP’s socket functions. That’s just off the top of my head since I don’t know if you actually mean ICMP when you say ping. You might like the ssh one, as I assume you will be doing your backup through ssh anyway – but if your ssh timeout is too long, you might like the nmap better.
ex:
ssh $hostname /bin/true && do_something
ping -c 1 $hostname && do_something
nmap -p 22 –host_timeout 5000000
$hostname && do_something
…
Jeremy
The ping -c 1 didn’t work for me (at least under OS X) – it hung there waiting for a response.
–Joe
Your new design seems to react weird whith your code snippets above. The code snippets wrap into your navigation on the right. (Browser: Mozilla Firefox 8, Linux)
Jer
Re: Footer Copyright statement. What I say is copyright Jeremy Brand, not Joe Stump, unless I give up my copyright to you.
You might want to re-write your footer so it is not false.
An example:
“Site & Content copyright Joe Stump. Joe Stump claims no responsibility or copyright to replies and posts and is not associated to the respectful replier or poster.”
You don’t want to get sued by Time Warner for someone posting quotes from Harry Potter, do you..?
😛 (emoticons?)
Jer
Such is the way of the pre tag. Not sure there is anything constructive I can do with the code (I don’t, afterall, want it to wrap).
Good point on the content. I need to make something up that will indemnify me from what you crazies post in the comments section.
–Joe