Health check curl example

[Marc Roos]

:) I really starting to feel a bit like an idiot, but all these 3 
configs[0] give error 'Client not compatible with this binary'

[0]
service health-check {
  executable = script /bin/health-check.sh
  inet_listener health-check {
      port = 5001
 }
}

service health-check {
  executable = script -e "HOME PATH" /bin/health-check.sh
  inet_listener health-check {
      port = 5001
 }
}

service health-check {
  executable = script -e HOME PATH /bin/health-check.sh
  inet_listener health-check {
      port = 5001
 }
}


Nov 25 11:44:52 test2 dovecot: script: Fatal: Client not compatible with 
this binary (connecting to wrong socket?)


-----Original Message-----
Subject: RE: Health check curl example

The -e parameter is used to define a "list of environment variables", so 
the error message telling you that you did not define a script is right. 


So far i understood that you wanted to use passthrough mode, so do not 
use -e but -p. (except you need to define some environment-variables for 
your script).

Executing the script executable standalone does not work it must be 
started from the dovecot master process, that is why you are getting the 
Panic. 

Markus

> On November 25, 2019 10:06 AM Marc Roos <m.roos at f1-outsourcing.eu> 
wrote:
> 
>  
> Thanks, Markus, maybe we should add this to the admin_manual? However 
> I am now getting the error 'script: Fatal: Missing script path'
> 
> Similar as when I try via the command line bash-5.0# 
> /usr/libexec/dovecot/script -e  /bin/health-check.sh
> Fatal: Missing script path
> 
> 
> bash-5.0# /usr/libexec/dovecot/script -e  /bin/ health-check.sh
> Panic: BUG: No IOs or timeouts set. Not waiting for infinity.
> Aborted (core dumped)
> 
> 
> 
> 
> -----Original Message-----
> Subject: Re: Health check curl example
> 
> Hi,
> 
> you can use telnet or netcat to send input to that port and receive 
> the answer.
> 
> echo "PING" | nc localhost 5001
> 
> Best regards
> 
> Markus
> 
> 
> On 11/24/19 2:43 PM, Marc Roos via dovecot wrote:
> >  
> > How do I check the standard script then on this port 5001 from the 
> > command line?
> > 
> > 
> > This one of alpine linux also does not have it yet bash-5.0# dovecot 

> > --version
> > 2.3.7.2 (3c910f64b)
> > 
> > 
> > 
> > 
> > 
> > -----Original Message-----
> > Subject: RE: Health check curl example
> > 
> > Yes. The passthrough option is rather new. 
> > 
> > Aki
> > 
> > 	On 24/11/2019 15:28 Marc Roos via dovecot < 
dovecot at dovecot.org>
> > wrote: 
> > 
> > 
> > 	I think I already have that, I am having this configured
> > 
> > 	service health-check { 
> > 	# this is the default configuration using the simple PING->PONG 

> > 	# example health-check. 
> > 	executable = script -p /bin/health-check.sh 
> > 	inet_listener health-check { 
> > 	port = 5001 
> > 	} 
> > 	}
> > 
> > 	bash-5.0# /bin/health-check.sh 
> > 	HTTP/1.1 200 OK 
> > 	Connection: keep-alive
> > 
> > 	OK
> > 
> > 
> > 
> > 
> > 
> > 	-----Original Message----- 
> > 	Subject: Re: Health check curl example
> > 
> > 	Your health check script should implement HTTP protocol. Then 
you
> can
> > 	use passthrough mode and use cURL. 
> > 
> > 	The provided script does not speak HTTP. 
> > 
> > 	Aki
> > 
> > 	On 24/11/2019 15:12 Marc Roos via dovecot < 
dovecot at dovecot.org> 
> > 	wrote: 
> > 
> > 
> > 	I am not understanding how this health check[1] script should
> work. 
> > 
> > 	From 
> > 	the commandline it works fine when I type a PING I get a PONG. 
> But
> > 	how 
> > 	do I do a curl to this 5001 port? 
> > 
> > 	Tried something like this: 
> > 
> > 	bash-5.0# curl http://localhost:5001/ 
> > 	curl: (56) Recv failure: Connection reset by peer
> > 
> > 	bash-5.0# curl http://localhost:5001/PING 
> > 	curl: (56) Recv failure: Connection reset by peer
> > 
> > 	[1] 
> > 	https://doc.dovecot.org/admin_manual/health_check/
> > 
> > 
> > 	--- 
> > 	Aki Tuomi
> > 
> > 
> > ---
> > Aki Tuomi
> > 
> >