Health-Check scripting

If you need dovecot to offer health-check functionality use the health-check service by extending it’s configuration with a listener like this:

service health-check {
  # this is the default configuration using the simple PING->PONG
  # example health-check.
  executable = script -p health-check.sh
  inet_listener health-check {
      port = 5001
 }
}

Options

• -p: The -p parameter for script enables the passthrough mode which allows

  to directly call a script without any protocol and directly receive the output. Be extremely careful when modifying the health-check.sh script or implementing your own.

• -e: The -e parameter can be used when using normal script mode. It

  allows to define a list of environment variables which can be set by a request before calling the health-check script. script -e foo bar health-check.sh

Script-Protocol

If the passthrough mode is not enabled the request must implement the following protocol:

VERSION .. <lf>
[alarm=<secs> <lf>]
[env_<variable_name>=<variable_value> <lf>]
[env_<variable_name2>=<variable_value2> <lf>]
...
"noreply" | "-" (or anything really) <lf>

arg 1 <lf>
arg 2 <lf>
...
<lf>
DATA

If alarm is specified, it MUST be before "noreply".
If "noreply" isn't given a "-" must be given.

arg

arguments that can be passed to the script.

env_

environment variables that have been marked as allowed by -e.

noreply

disable the success/fail answer by script executable itself.

VERSION

the VERSION of script (AToW 4.0 eg “VERSION\tscript\t4\t0\n”).

DATA

input to be passed to the script to be called.