Forum Discussion
RobW
Nimbostratus
NimbostratusHTTP Monitor - Java Script
The following monitor was allegedly working fine on a competitors product, but not on the LTM v9.4.3
send "GET /auth/?checkall=true HTTP/1.0\\r\\n\\r\\n"
expect "PASS"
I believe this was never working correctly. If I modify the send string to:
GET /auth/?checkall=true HTTP/1.0\\r\\n\\r\\nConnection: Close\n\n
Receive string error:
400 Bad request
400 Bad request
Connection closed by foreign host.
Once again if I modify the receive string to:
GET /auth/?checkall=true - This cause a Java Script to run and the following valid receive string is displayed.
Monitor Output
PASS
If I list 'PASS' or PASS as the receive string the pool marked a being offline.
Output from the command line of the LTM.
[admin@lb2cmgmt:Active] ~ telnet 10.20.62.65 8080
Trying 10.20.62.65...
Connected to 10.20.62.65.
Escape character is '^]'.
GET /auth/?checkall=true
Monitor Output
PASS
Connection closed by foreign host.
What am I overlooking?
6 Replies
hoolioCirrostratus
I don't think you can specify a Connection header in HTTP v1.0. You only need to use one backslash to escape characters. And there should only be one \r\n between lines. The bigd monitoring daemon appends a trailing \r\n to the request, so you only need to put one at the end.
How about this:
GET /auth/?checkall=true HTTP/1.1\r\nConnection: Close\r\nHost: \r\n
If you still get a 40x error from the web server, try putting a Host header value:
GET /auth/?checkall=true HTTP/1.1\r\nConnection: Close\r\nHost: test.example.com\r\n
Aaron- RobWAaron,
I caught some of your other postings concerning monitoring and here's my attemps below
[admin@lb2cmgmt:Active] ~ telnet 10.20.62.65 8080
Trying 10.20.62.65...
Connected to 10.20.62.65.
Escape character is '^]'.
GET /auth/?checkall=true HTTP/1.1\r\nConnection: Close\r\nHost: \r\n
400 Bad request
400 Bad request
Connection closed by foreign host.
[admin@lb2cmgmt:Active] ~ telnet 10.20.62.65 8080
Trying 10.20.62.65...
Connected to 10.20.62.65.
Escape character is '^]'.
GET /auth/?checkall=true HTTP/1.1\r\nConnection: Close\r\nHost: 10.20.62.65\r\n
400 Bad request
400 Bad request
Connection closed by foreign host.
[admin@lb2cmgmt:Active]
If I just run the following the output is correct, but I cannot match on the receive string of "PASS"
[admin@lb2cmgmt:Active] ~ telnet 10.20.62.65 8080
Trying 10.20.32.65...
Connected to 10.20.62.65.
Escape character is '^]'.
GET /auth/?checkall=true
Monitor Output
PASS
Connection closed by foreign host.
-Rob - RobWThank you for the tip on nc. When I execute the command as listed it works fine. When I set it up as a monitor is fails. I can only believe I'm incorrectly formating the receive string field. I've attached a screen shot of the Monitor send string and receive string.
[admin@lb2cmgmt:Active] ~ echo -ne "GET /auth/?checkall=true HTTP/1.1\r\nConnection: Close\r\nHost: \r\n\r\n" | nc 10.20.62.65 8080
HTTP/1.1 200 Ok
Date: Thu, 31 Jan 2008 00:20:25 GMT
Server: AKO Monitoring Server/v1.0
Connection: close
SM_CHECK: PASS
Content-Type: text/html
Monitor Output
PASS
[admin@lb2cmgmt:Active] ~ - hoolioThat's an odd one. I assume the send string is all on one line and it's just your browser that's wrapping it?
Can you check the web server access logs to see what the app is receiving?
You can also enable debug on the monitoring daemon, bigd, by running 'b db Bigd.Debug enable'? The debug is logged to /var/log/bigdlog by default. Because the debug output creates a lot of log output, make sure to disable it once you're done testing by running 'b db Bigd.Debug enable'.
Aaron - RobWAaron,
Thanks for your help, enabling the debug I was able to see that that the health monitor was running against the service port defined for the pool members, which is different from the port that the monitor needs to check. After reviewing the config manual I found I needed to set the alias service port.
Thanks,
Rob - hoolioHi Rob,
Good to hear you got it working.
Aaron
