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policy-systemhealth

System Health checker for Postfix integrated using same mechanism as postgrey

Background

This uses the Postfix STMP Access Policy Delegation mechanism http://www.postfix.org/SMTPD_POLICY_README.html

See also http://www.postfix.org/access.5.html

Usage:

policy-systemhealth /etc/postfix/systemhealth.yml

check_nfs_mount

A NFS server going down can be simulated by blocking the host in iptables, eg:

block

iptables -A INPUT -s -j DROP

check

iptables -nL

unblock

iptables -F

sssd_health

This runs sssctl to determine the health of the AD connection for the machine.

AD server downtime can be simulated using above technique of blocking the host.

user_exists

This runs through a lists of users configured calling getpwnam to check if that returns a password entry

Configuration

A sample systemhealth.yml file is included in this repository

Dependencies

On Debian install the following packages:

  • libyaml-perl
  • libgetopt-long-descriptive-perl
  • libarray-utils-perl
  • libcapture-tiny-perl
  • libfile-which-perl