January 15, 2018 asvignesh

Today’s developers and organizations are migrating large, monolithic legacy applications to microservice-based architectures to improve scalability and developer velocity. However, these benefits come at a cost, namely integration complexity. Additionally, developers still often interact directly with the infrastructure, whether it be virtual machines (VMs) or containers via Kubernetes or another container orchestrator. Serverless is the next evolution of application and system design and deployment. Serverless applications are built upon functions—small code artifacts, which are compact and specific to a discrete task. Serverless doesnt means servers are no more required to run workloads, it simply means that developers no longer has…

January 6, 2018 asvignesh

Amazon Linux a free, very up-to-date OS, complete with all AWS tools, Amazon has made it pretty compelling to use their OS over any others. But it was not open source. Now Amazon released Amazon Linux 2 an open source* Linux operating system. It provides a high performance, stable, and secure execution environment for cloud and enterprise applications. Amazon Linux 2 will offer the extended availability of software updates for the core operating system through 5 years of long-term support and provides access to the latest software packages through the Amazon Linux Extras repository. Earlier Amazon Linux was available only as AMI…

September 8, 2015 asvignesh 2Comment

Recently My client have been having some issues with the vSphere web client plugins, they were getting #1009 error often Initially i googled and try to find the solution and root cause, many blogs are suggesting disable the installed plugins and try again. Later i read somewhere ( forget the link) , clearing cache would help This issue is because of the cached objects and it happened when you are navigating through the inventory in the vSphere 6.0, usually this error message pops up, you have to refresh your full web page Error 1009, click yes…

October 9, 2014 asvignesh

VMware vCenter 5.1 and before the default behavior was to allow all domain admins to login and administrate your ESXi hosts. Once the 5.5 vCenter installed if you try and connect using a domain account you will get the error :The vSphere Client could not connect to “FQDN / IP”. You do not have permission to login to the server: FQDN / IP   To get domain credentials to work you need to login to the VMware vSphere Web Client and setup the relevant permissions. So how to login to vCenter using web client if domain users are not allowed?…

May 8, 2014 asvignesh 1Comment

This is reference article for VMware ESXi 5.x logs, their locations and use-cases. Log File Location Description Troubleshooting /var/log/auth.log ESXi Shell authentication success and failure Security /var/log/dhclient.log DHCP client service, including discovery, address lease requests and renewals Networking /var/log/esxupdate.log ESXi patch and update installation logs Updates, Security /var/log/hostd.log Host management service logs, including virtual machine and host Task and Events, communication with the vSphere Client and vCenter Server vpxa agent, and SDK connections. vCenter, Events, Security, Networking /var/log/shell.log ESXi Shell usage logs, including enable/disable and every command entered Security /var/log/sysboot.log Early VMkernel startup and module loading Host /var/log/syslog.log Management service…

April 14, 2014 asvignesh 2Comment

VMware Vcenter 5.1 and before the default behaviour was to allow all domain admins to login and administrate your ESXi hosts. Once the 5.5 vCenter installed if you try and connect using a domain account you will get the error :The vSphere Client could not connect to “FQDN / IP”. You do not have permission to login to the server: FQDN / IP   To get domain credentials to work you need to login to the VMware vSphere Web Client and setup the relevant permissions. So how to login to vCenter using web client if domain users are not allowed?…

February 18, 2014 asvignesh 1Comment

The OVF in vSphere is not just about deployment and packaging. There is also a runtime part, namely the OVF environment. This is a feature that has been around since the early days of vSphere 4.x, if not earlier which provides a mechanism to retrieve some of this information as well as custom properties. The OVF feature provides users with the capability to pass in any type of metadata information such as application start up parameters, network configuration, password management, etc. directly into the guestOS for flexible guest customization. In this post, i will show how to fetch the runtime…

February 17, 2014 asvignesh 1Comment

VMware Tools is a suite of utilities that enhances the performance of the virtual machine’s guest operating system and improves management of the virtual machine. For example, the following features are just some of the features that are available only if VMware Tools is installed: Significantly faster graphics performance and Windows Aero on operating systems that support Aero The Unity feature, which enables an application in a virtual machine to appear on the host desktop like any other application window Shared folders between host and guest file systems Copying and pasting text, graphics, and files between the virtual machine and…

February 3, 2014 asvignesh

There are two ways to enable / diable VAAI plugin, One via command line and one via vSphere Client UI Using command line Login to ESXi using putty / terminal Use “esxcfg-advcfg” command to manage your VAAI settings  To Check the Status esxcfg-advcfg -g (returnvalue 1 = enabled) ~ # esxcfg-advcfg -g /DataMover/HardwareAcceleratedMove Value of HardwareAcceleratedMove is 1 ~ # esxcfg-advcfg -g /DataMover/HardwareAcceleratedInit Value of HardwareAcceleratedInit is 1  To disable VAAI ~ # esxcfg-advcfg -s 0 /DataMover/HardwareAcceleratedInit Value of HardwareAcceleratedInit is 0 ~ # esxcfg-advcfg -s 0 /DataMover/HardwareAcceleratedMove Value of HardwareAcceleratedMove is 0 To enable VAAI ~ # esxcfg-advcfg -s…

February 3, 2014 asvignesh 2Comment

VAAI vStorage API for Array Integration (VAAI) is a technology that VMware makes available for storage vendors to offload the storage operation like cloning , space reservation from the ESX CPU to the storage array. What is VAAI? VMware vStorage APIs Integration (VAAI) is a set of APIs provided by VMware that allows the ESXi hosts to offload data processing of certain storage-related services like full file cloning, extended statistic and space reservation to storage array Host. Benefits of VAAI NAS: The integration of Storage array with VMware VAAI-NAS offers datacenter administrators deploy a VMware virtualized environment with optimized performance….