by Jim Nathlich
Hello I have set up a port monitor. the monitor executes a request and
get a response in the format ":N
" where N
is a number indicating the length of a backlog. I want to monitor to
make sure that backlog doesn't get too long. In the content match
section of the port monitor I have entered the following regular expression:
:[0-1][0-9]?$|:[2-9]$
which should match ":0" through ":19". Once the
backlog reaches 20 it will change the status to trouble. However this
does not work as intended. Instead I simply get an immediate trouble
alert which reads:
The String ":[0-1][0-9]?$|:[2-9]$" is not present in the response
I've tried quoting the expression also with no luck. Are
regular expressions accepted in the port monitor keyword check? If not
is there another way to achieve this objective?
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Replies (3)
Hello,
Thanks for raising this request. We will extend the capability to
support regular expression in content check for port monitor, which
does not exist currently.
An additional question, what protocol you use to retrieve backlog
length ? Is there any specific protocol or you use just a command
over TCP, which your server understands and respond ?
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by Jim Nathlich
Hi Raghavan - the thing I am monitoring is resque which is a queue
system back-ended by redis. So to monitor the queue length I am
connecting via telnet and issuing the following command:
LLEN "resque:queue:AMD\\Jobs\\SendEmail"
Which returns the number of items in the SendEmail queue. The
response is a CRLF terminated string representing an integer, prefixed
by a ":" byte. For example
:0\r\n, or
:1000\r\n. More about the redis protocol can be read
here.
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Hi Darryl,
Thanks for providing the details over this. We will support RegEx
support for content matching in our Port Monitor soon. We will keep
you updated regarding this.
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