CentOS 7
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Sensu : Email Handler
2017/11/08
 
Set Email Handler to notify alerts via Email.
[1]
Install SMTP Server, refer to here.
If using SMTP only on localhost, it's OK to run it with default settings.
[2] Install a plugin for Email.
[root@dlp ~]#
sensu-install -p mailer
[root@dlp ~]#
vi /etc/sensu/conf.d/mailer.json
# create new

# for [admin_gui], it's Uchiwa's access path

# if enabled SSL/TLS, set [smtp_enable_starttls_auto] to [true]

{
  "mailer": {
    "admin_gui" : "https://dlp.srv.world:3000/",
    "mail_from": "root@dlp.srv.world",
    "mail_to": "root@dlp.srv.world",
    "smtp_address": "127.0.0.1",
    "smtp_enable_starttls_auto": "false",
    "smtp_port": "25",
    "smtp_domain": "srv.world"
  }
}

[root@dlp ~]#
vi /etc/sensu/conf.d/default-handler.json
# create new

{
  "handlers": {
    "default": {
      "type": "set",
      "handlers": [ "mailer" ]
    },
    "mailer": {
      "type": "pipe",
      "command": "handler-mailer.rb",
      "severities": [
        "ok",
        "warning",
        "critical",
        "unknown"
      ]
    }
  }
}

[root@dlp ~]#
systemctl restart sensu-server sensu-api

[3] It's OK. If some failure occurs or recovered, notify email is sent to the address you set on config.
# follows is the case 22 port check is failure
From root@dlp.srv.world  Fri Nov 10 19:28:30 2017
Return-Path: <root@dlp.srv.world>
X-Original-To: root@dlp.srv.world
Delivered-To: root@dlp.srv.world
Date: Fri, 10 Nov 2017 19:28:30 +0900
From: root@dlp.srv.world
Reply-To: root@dlp.srv.world
To: root@dlp.srv.world
Subject: ALERT - dlp/port_check: CRITICAL
Content-Type: text/plain;
 charset=ISO-8859-1
X-Sensu-Host: dlp
X-Sensu-Timestamp: 2017-11-10 19:28:29 +0900
X-Sensu-Address: 127.0.0.1
X-Sensu-Check-Name: port_check
X-Sensu-Status: CRITICAL
X-Sensu-Occurrences: 1
Status: RO

CheckPort CRITICAL: Connection refused by 0.0.0.0:22

Admin GUI: https://dlp.srv.world:3000/
Host: dlp
Timestamp: 2017-11-10 19:28:29 +0900
Address:  127.0.0.1
Check Name:  port_check
Command:  check-ports.rb -p <password omitted> -t 10
Status:  CRITICAL
Occurrences:  1


# for the case above failure has beec recovered
From root@dlp.srv.world  Fri Nov 10 19:29:30 2017
Return-Path: <root@dlp.srv.world>
X-Original-To: root@dlp.srv.world
Delivered-To: root@dlp.srv.world
Date: Fri, 10 Nov 2017 19:29:30 +0900
From: root@dlp.srv.world
Reply-To: root@dlp.srv.world
To: root@dlp.srv.world
Subject: RESOLVED - dlp/port_check: OK
Content-Type: text/plain;
 charset=ISO-8859-1
X-Sensu-Host: dlp
X-Sensu-Timestamp: 2017-11-10 19:29:29 +0900
X-Sensu-Address: 127.0.0.1
X-Sensu-Check-Name: port_check
X-Sensu-Status: OK
X-Sensu-Occurrences: 1
Status: RO

CheckPort OK: All ports (22) are accessible for host 0.0.0.0

Admin GUI: https://dlp.srv.world:3000/
Host: dlp
Timestamp: 2017-11-10 19:29:29 +0900
Address:  127.0.0.1
Check Name:  port_check
Command:  check-ports.rb -p <password omitted> -t 10
Status:  OK
Occurrences:  1
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