Update: Trigger a User event from the VCSA command line

Disclaimer: This is not officially supported by VMware, please use at your own risk.

Recently I faced the challenge with a script running on a VCSA which executes some checks and in case something gets detected it has to trigger a vCenter alarm.

My solution is to log a user event which will be captured by an vCenter alert definition.

1. vCenter alert definition

as trigger manually enter (type): vim.event.GeneralUserEvent

2. The script which will log the user event



import sys
sys.path.insert(0, '/usr/lib/vmware/site-packages/')
from pyVim.connect import SmartConnect
from pyVmomi import vim
import ssl
import atexit

username = 'administrator@vsphere.local'
password = 'VMware1!'

v = sys.version_info

        if sys.version_info[1] <7 or v.minor < 7:
                si = SmartConnect(host="localhost", user=username, pwd=password)
                content = si.RetrieveContent()
                ds = content.rootFolder
                log = si.content.eventManager.LogUserEvent(entity=ds, msg="Postgres Corruption detected")
                s = ssl.SSLContext(ssl.PROTOCOL_TLS)
                s.verify_mode = ssl.CERT_NONE
                si = SmartConnect(host="localhost", user=username, pwd=password, sslContext=s)
                content = si.RetrieveContent()
                ds = content.rootFolder
                log = si.content.eventManager.LogUserEvent(entity=ds, msg="Postgres Corruption detected")
        print("Unexpected error:", sys.exc_info()[0])


The resulting alert can be catched by vROPs and trigger further events/ tickets.…

How to configure VMware monitoring in Check_MK

Check_MK is able to monitor ESXi or vCenter out of the box. The configuration requires 2 steps and preferred a read only user.

1. Login to Check_MK


2. Create new Host


Hostname: ESXi/vCenter Name or fqdn
IP Address: ESXi/vCenter Management IP


Save & Go to Services

The error message is normal and we can ignore it.


3. Go to Host & Service Parameters


4. Click on Datasource Programs


5. Click Check state of VMWare ESX via vSphere

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6. Create rule in folder Main directory

Explicit hosts: ESXi-Name
vSphere User name: ReadOnlyUser-Name
vSphere secret: Password of the ReadOnlyUser
 Host Systems
 Virtual Machines
 Performance Counters
 License Usage
 Display ESX Host power state on 
 Display VM power state on
 Placeholder VMs 

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8. Click on Save

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9. Activate your changes

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10. Click on Hosts

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11. Click on Hosts

3rd icon – Edit services of host

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12. Activate missing

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13. Activate your …

Setup check_mk

Check_MK is a monitoring solution which is originally based on Nagios. It has been extended with a nice web gui including a lot of new features which simplify the setup of a monitoring system. It is available as Enterprise edition and as RAW (Open Source) edition.

There is a limited english documentation available. https://mathias-kettner.de/checkmk.html

Steps to install and configure Check_MK on CentOS7:

Download CentOS7 image (minimal is sufficient) http://isoredirect.centos.org/centos/7/isos/x86_64/CentOS-7-x86_64-Minimal-1511.iso

Install Centos following the standard documention. After you have successfull installed Centos login to the system using SSH.

ssh root@centos7

First install all available updates.

yum update

Second some packages are required to be able to install check_mk successfully.

yum -y install epel-release
yum makecache all
yum -y install php-mcrypt

Download fping (http://pkgs.repoforge.org/fping/?C=M;O=D) and install it:

cd /root
wget http://pkgs.repoforge.org/fping/fping-3.10-1.el7.rf.x86_64.rpm
rpm -i fping*.rpm

Furthermore it is required to change SELINUX.

vi /etc/sysconfig/selinux
# This file controls the state of SELinux on