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|
{ lib, ... }:
{
name = "nagios";
meta = with lib.maintainers; {
maintainers = [ symphorien ];
};
nodes.machine =
{ pkgs, ... }:
let
writer = pkgs.writeShellScript "write" ''
set -x
echo "$@" >> /tmp/notifications
'';
in
{
# tested service
services.sshd.enable = true;
# nagios
services.nagios = {
enable = true;
# make state transitions faster
extraConfig.interval_length = "5";
objectDefs =
(map (x: "${pkgs.nagios}/etc/objects/${x}.cfg") [
"templates"
"timeperiods"
"commands"
])
++ [
(pkgs.writeText "objects.cfg" ''
# notifications are written to /tmp/notifications
define command {
command_name notify-host-by-file
command_line ${writer} "$HOSTNAME is $HOSTSTATE$"
}
define command {
command_name notify-service-by-file
command_line ${writer} "$SERVICEDESC$ is $SERVICESTATE$"
}
# nagios boilerplate
define contact {
contact_name alice
alias alice
host_notifications_enabled 1
service_notifications_enabled 1
service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r,f,s
host_notification_options d,u,r,f,s
service_notification_commands notify-service-by-file
host_notification_commands notify-host-by-file
email foo@example.com
}
define contactgroup {
contactgroup_name admins
alias Admins
members alice
}
define hostgroup{
hostgroup_name allhosts
alias All hosts
}
# monitored objects
define host {
use generic-host
host_name localhost
alias localhost
address localhost
hostgroups allhosts
contact_groups admins
# make state transitions faster.
max_check_attempts 2
check_interval 1
retry_interval 1
}
define service {
use generic-service
host_name localhost
service_description ssh
check_command check_ssh
# make state transitions faster.
max_check_attempts 2
check_interval 1
retry_interval 1
}
'')
];
};
};
testScript = ''
with subtest("ensure sshd starts"):
machine.wait_for_unit("sshd.service")
with subtest("ensure nagios starts"):
machine.wait_for_file("/var/log/nagios/current")
def assert_notify(text):
machine.wait_for_file("/tmp/notifications")
real = machine.succeed("cat /tmp/notifications").strip()
print(f"got {real!r}, expected {text!r}")
assert text == real
with subtest("ensure we get a notification when sshd is down"):
machine.succeed("systemctl stop sshd")
assert_notify("ssh is CRITICAL")
with subtest("ensure tests can succeed"):
machine.succeed("systemctl start sshd")
machine.succeed("rm /tmp/notifications")
assert_notify("ssh is OK")
'';
}
|
