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Old 09-27-2010, 04:28 AM   #1
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Registered: Jun 2010
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using SSH in PHP invokes 'Host Key Verification Failed' error

Hi all,

Im trying to do a remote execution of scripts through SSH in PHP.

What im doing:
-Use PHP in conjunction with nagios' check_by_ssh script to execute the script.
-I used
$output = shell_exec('cd /usr/local/nagios/libexec && ./check_by_ssh -H server01 -l nagios -C "/server01/nagios/plugin/check_memory"');
-It gives me a 'Host key verification failed' error even though i enabled it to ssh from my server to server01 without password.

My Qn:
How do i get it to work?
Old 09-27-2010, 08:40 AM   #2
Registered: Oct 2007
Distribution: Arch x86_64
Posts: 606

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You need an entry in your known_hosts file. There's a system wide one as well as a per-user one. You can just manually run an ssh connection to that server, and then put it's hostkey in your system-wide known_hosts file. I'm not sure but you may need to clean out the PHP users too.

Also, I know PHP has some built in SSH functionality, are you sure you want to be calling a shell process for this?
Old 09-27-2010, 08:32 PM   #3
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Registered: Jun 2010
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im currenly tapping on the ssh script for testing purpose. If possible, it will introduce a much simpler solution for my case I will give it a try on the system wide known hosts file.

Thanks for your feedback.
Old 10-01-2010, 01:26 PM   #4
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Registered: Oct 2010
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Also, I know PHP has some built in SSH functionality, are you sure you want to be calling a shell process for this?
The built in functionality isn't present on most servers and even on those it is present on it has a reputation for being buggy and difficult to use.

In my experience, the best way to do SSH from PHP is with phpseclib, a pure PHP SSH client. To do what you're trying to do you'd do something like....

$ssh = new Net_SSH2();
$ssh->login('...', '...');
echo $ssh->exec('...');


nagios, php5, ssh

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