Re: Couple of issues with SMTP_CHECK

25.03.2015 18:00, Chris Adams пишет:
> Once upon a time, Alexey Andrianov <[email protected]> said:
>> Hello, Chris.
>>
>> To proceed with the second issue, please provide the section of your
>> keepalived.conf corresponding to an SMTP real-server.
> Here's an example:
>
>      real_server 10.0.9.144 587 {
>          weight 1
>          SMTP_CHECK {
>              connect_timeout 3
>              connect_port 587
>          }
>      }
>
> I verified with tcpdump that keepalived was still connecting to port 25.
> IPVS is properly configured for port 587; only the check is wrong.
Yes, I thought so. This is a configuration issue, not a bug. The 
SNMP_CHECK uses the default port (25) and not the RS port for checks 
unless 'host' section is specified in config.
Any connection options (except of connect_timeout) must be specified 
only in 'host' subsection.

Sample config from keepalived.conf.SNMP_CHECK provides this:
     real_server 172.16.1.11 25 {
         weight 1
         SMTP_CHECK {
             connect_timeout 10
             retry 2
             delay_before_retry 5
             helo_name foo.bar.com

             host {
                 connect_ip 172.16.1.11
             }

             host {
                 connect_ip  192.168.155.10
             }

             host {
                 connect_ip  64.233.167.99
             }
         }
     }


The syntax of SNMP_CHECK as it is declared in the source code:

/* Config callback installer */
void
install_smtp_check_keyword(void)
{
         /*
          * Notify the config log parser that we need to be notified via
      * callbacks when the following keywords are encountered in the
      * keepalive.conf file.
          */
     install_keyword("SMTP_CHECK", &smtp_check_handler);
     install_sublevel();
     install_keyword("helo_name", &smtp_helo_name_handler);

     /* This is kept for backward compatibility.
     Used as default value for per-host timeout */
      install_keyword("connect_timeout", &smtp_timeout_handler);

     install_keyword("warmup", &warmup_handler);
     install_keyword("delay_before_retry", &smtp_db_retry_handler);
     install_keyword("retry", &smtp_retry_handler);
     install_keyword("host", &smtp_host_handler);
     install_sublevel();
     install_connect_keywords();
     install_sublevel_end();
     install_sublevel_end();
}


-- 
Best regards,
Alexey


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