The data service timed out because a back-end task took more than 120

Today I received error on my vm summary page in Vsphere web client: The data service timed out because a back-end task took more than 120 seconds. See the vsphere-client-virgo.log for more details.

Just before that I removed a test vcenter server, which was connected to my PSC  on production Vsphere instance.

You need to remove a stale vCenter Server from your SSO environment, use the cmsso-util. It may takes a long time but does the job.

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How to monitor sql queries with zabbix

If you want to monitor some parameters in mysql database,  you can do it with ODBC monitoring in Zabbix.

ODBC monitoring corresponds to the Database monitor item type in the Zabbix frontend.

ODBC is a C programming language middle-ware API for accessing database management systems (DBMS). The ODBC concept was developed by Microsoft and later ported to other platforms.

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Free SSL certificate for 3 years and up to 100 domains

 More and more people reconfigured their sites to ssl connection. So I decided to use ssl certificate and secure connection on my blogs too.

The Chinese CA WoSign offers free SSL certificates which are valid for 2 years and may contain up to 100 domains each (multi-domain/SAN/UCC) which is very useful to host various domains on one single IP address (Better option than SNI if you still have Windows XP clients). Before you stop reading because you don't trust a Chinese company for your website encryption please keep in mind that you don't have to trust them at all! You generate the SSL key on your server and only send them the CSR (certificate signing request) which doesn't contain any private information.

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Install Ruby 2.3.1 or any other version on Centos

1. Installing Recommended Packages

There are few developemnt libraries required to run Ruby on Linux. Use following command to install recommended packages on your server using yum.


# yum install gcc-c++ patch readline readline-devel zlib zlib-devel 
# yum install libyaml-devel libffi-devel openssl-devel make 
# yum install bzip2 autoconf automake libtool bison iconv-devel

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VMware Horizon View Auto-Connection Utility

There is new useful utility on VMware Labs for VMware Horizon View administrators which helps them to connect the VMware View Client automatically into a View desktop or an application pool when the system starts up. This can be very useful for thin clients or for turning existing Windows endpoints into thin client systems used to automatically connect into a View desktop.

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