Forum Discussion
NimbostratusCan F5 Health Monitor follow a redirect chain?
I have an application that I am trying to setup a health monitor for and have the following:
Send String: GET /layout.json HTTP/1.1\r\nHost: \r\nConnection: Close\r\n\r\n
Receive String: HTTP/1.(0|1) (2|302)
This works except when the database connection goes down. Tomcat is still running, so the page still sends a 302 redirect to some cookie check. Then 302 redirects back to the layout page which produces a status 500 error. Is there a way for the health check to follow this chain to the end where it would give a 200 or 500 code and down the node? Thanks for any help.
5 Replies
Michael_JenkinsCirrostratus
You could create a secondary monitor to check the layout page for success and use them both on the pool. I don't remember if the monitors function as OR or AND so this may not work. But it's worth a shot.
- Michael_Jenkins
Does the 302 redirect to a single page, or does it use different locations depending on other circumstances?
- nitass
Employee
just wondering why don't monitor the redirection target.
sol3224: HTTP health checks may fail even though the node is responding correctly
https://support.f5.com/kb/en-us/solutions/public/3000/200/sol3224.htmlmetaif you really want to follow redirection, external monitor (e.g. curl -L) may be a way to go.
R_Melissari_180Michael J: Not sure what a secondary monitor would check? The initial responses look the same whether the database is up or not. It 302 directs to a cookie check and then back to the page. It is only at the end does it give me a status 200 or 500 that I could use. The application does this cookie check redirect on every page it serves out as far as I can tell. At the end of the chain it is at the same page I initially went to.
Nitass: It is just a cookie check and arrives back at the original location. I just don't know how to send it a fake cookie or string to bypass the check and get to the end of the chain. Do you have any documentation handy on setting up a curl monitor with the F5 to down nodes?
Thank you for your responses.
- Michael_Jenkins
I haven't done custom external monitors before, but I think what nitass mentioned would be something like this. It may get you started on the path.
