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Blue_whale's avatar
Blue_whale
Icon for Cirrocumulus rankCirrocumulus
Jun 11, 2020

F5 is not marking the pool member status as DOWN

Hi All ,   When the service on the member node 10.179.16.19 is DOWN, the F5 monitor is not marking the pool member status as offline .     When server team changes the receive string code to 50...
application delivery
BIG-IP
health monitor
https
LTM
  • cjunior's avatar
    cjunior
    Jun 16, 2020

    Hello,

    Probably the string "200" appears on head or body, while the string "200 OK" appears only on http response code status in headers.

    e.g.

    This output has "200 OK" on header and "200" on body.

    # curl -kv http://172.30.0.1/default.asp
*   Trying 172.30.0.1...
* Connected to 172.30.0.1 (172.30.0.1) port 80 (#0)
> GET /default.asp HTTP/1.1
> Host: 172.30.0.1
> User-Agent: curl/7.47.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Cache-Control: private
< Content-Type: text/html
< Server: Microsoft-IIS/10.0
< Set-Cookie: ASPSESSIONIDCADABDAD=OPKBINHAKLGGIGHNPBCBEDGP; path=/
< Date: Tue, 16 Jun 2020 17:04:22 GMT
< Content-Length: 118
<
<html>
<head>
</head>
<body>
 200  is a number that matches 200
 2002 is a number that matches 200 as well
 </body>
</html>
* Connection #0 to host 172.30.0.1 left intact

    This other response header example, the HTTP code is 503 while content-length is 200 that matches your recv param.

    HTTP/1.1 503 Service Unavailable
Cache-Control: private
Content-Type: text/html
Content-Length: 200

    Regards.

     

cjunior's avatar
cjunior
Icon for Nacreous rankNacreous
Jun 12, 2020

Hello,

That status means that you forced offline a member.

If you need to grab availability from members, you can run 'show" instead of "list" command:

Also, you can have this output in field format as well:

show ltm pool gw-internet-test_POOL members field-fmt

Look for "status.availability-state" field for each member and you will get member's availability.

For a monitor status result, there is a little difference when you disable or force offline a member, where this is "down" when monitor failed and "user-down" when forced offline.

I hope it helps

cjunior