Re: Check that text does not exist on a page on a name-based virtual host

[Mark Feeney]

Thanks for the info, Martin.

Just to finish up this thread, here's what I ended up doing:

My ancient version of monit (4.10, November 2007) is apparently
lacking any name-based virtual host support:  'man monit' talks only
about IP-based, and hostheader is not mentioned at all (and fails to
parse).  So instead, I hacked things:

For my site foo.com, I added an entry in /etc/hosts:
127.0.0.1 foo.com.localhost

And added this rule to monit:

check host production-box with address 127.0.0.1
  if failed host foo.com.localhost port 81 proto http
    request "/bar"
    then alert

This seems to send 'foo.com.localhost' as the http Host header, and my
server can thread 'foo.com.localhost' the same as 'foo.com', so it
works.  It seems to fire if I get a non-200 error from the server, so
that'll do fine for now.

Thanks for the help.  I really need to get an updated monit!


On Mon, Oct 4, 2010 at 9:05 AM, Martin Pala <address@hidden> wrote:
> The send/expect supports posix regular expression, so it should be possible 
> to define negative match.
>
>
> On Oct 4, 2010, at 2:30 PM, Mark Feeney wrote:
>
>> Hi, Martin.
>>
>> Thank you for your reply.  I can probably find a way to make the
>> second example work, but what would be ideal for my particular case
>> would be a "negative expect".  i.e. something like this:
>>
>> if failed host cave.persia.ir port 4040
>>   send "Open, Sesame!\r\n"
>>   expect anything but "sorry, the cave door is broken!"
>> then restart
>>
>> I didn't see anything in the docs supporting this idea with
>> send/expect.  Wondering if I missed something.
>>
>> Related question: does the regex library monit uses support
>> negative-lookahead matching?
>>
>> Thanks,
>>
>>
>> Mark.
>>
>>
>>
>> On Mon, Oct 4, 2010 at 6:51 AM, Martin Pala <address@hidden> wrote:
>>> Hi,
>>>
>>> you can use the "hostheader" option with the http protocol test (requires 
>>> monit 5.1.1 or newer) - unfortunately this syntax doesn't support the 
>>> "content" check.
>>>
>>> Example:
>>> --8<--
>>> check host production with address 127.0.0.1
>>>    if failed port 9999 protocol http request "/some_page" hostheader 
>>> "foo.com" then alert
>>> --8<--
>>>
>>> We should consolidate the url test to support hostheader + the http 
>>> protocol test to support content check.
>>>
>>>
>>> As a workaround, you can define the whole HTTP request and expected 
>>> response using generic send/expect test. Example:
>>> --8<--
>>>  if failed host cave.persia.ir port 4040
>>>    send "Open, Sesame!\r\n"
>>>    expect "Please enter the cave\r\n"
>>>    send "Shut, Sesame!\r\n"
>>>    expect "See you later [A-Za-z ]+\r\n"
>>>  then restart
>>> --8<--
>>>
>>> Regards,
>>> Martin
>>>
>>>
>>> On Oct 2, 2010, at 10:28 PM, Mark Feeney wrote:
>>>
>>>> Greetings.
>>>>
>>>> First: I love monit.  Excellent tool.  Very simple and effective.
>>>> Thanks to all involved.
>>>>
>>>> I have come up with something I can't figure out how to monitor,
>>>> though:  I want to check that a web page does not contain certain text
>>>> and the page is on a name-based virtual host.
>>>>
>>>> This almost works for me:
>>>>
>>>> check host production with address 127.0.0.1
>>>>    if failed url
>>>>        http://foo.com/some_page
>>>>        and content != 'BAD'
>>>>        then restart
>>>>
>>>> However, it's incorrect for me to use "http://foo.com"; since it's a
>>>> cluster, so restarting the current server isn't necessarily going to
>>>> help.
>>>>
>>>> What I want is something like:
>>>>
>>>> check host production with address 127.0.0.1
>>>>    if failed url
>>>>        http://127.0.0.1:9999/some_page
>>>>        use host header "foo.com" # not real syntax
>>>>        and content != 'BAD'
>>>>        then restart
>>>>
>>>> Is there a way to achieve this?  proto http and SEND/EXPECT seemed a
>>>> possibility, but I'm not sure how to write the EXPECT part.
>>>>
>>>> I'm using monit 4.10.1.
>>>>
>>>> Thanks,
>>>>
>>>>
>>>> Mark.
>>>>
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>>>
>>>
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