GitHub Commands Tutorial for Beginners

GitHub is a code hosting platform for version control and collaboration. It lets you and others work together on projects from anywhere. GitHub has become the industry-standard version control and publishing the platform for web developers. It also provides command line tool access control and several collaboration features, such as wikis and basic task management […]
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Enable SNMP on VMware ESXi host

Simple Network Management Protocol (SNMP) allows management programs to monitor VMware and control networked devices in VMware ESXi. SNMP configuration for ESXi requires vSphere Command-Line Interface. vCenter Server and ESXi systems include different SNMP agents. vCenter Server SNMP agent. The SNMP agent included with vCenter Server can send traps when the vCenter Server system is […]
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Enable VNC Console Access in VMware ESXi

The ability to connect to a virtual machine using a VNC client has been available since the early days of VMware GSX but is not officially supported by VMware. Use the following steps to enable VNC console Access in VMware ESXi host. SSH to the ESXi host chmod 644 /etc/vmware/firewall/service.xml chmod +t /etc/vmware/firewall/service.xml vi /etc/vmware/firewall/service.xml […]
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Detect New Hard Disk Without Reboot VMware

A new hard disk to your Linux OS running on any Virtual Environment which like VMware workstation. It won’t reflect unless you reboot the Guest OS. In order to detect the new hard drive without reboot use the following steps. Add a New Disk To VM First, you need to add hard disk by visiting […]
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Add Compute Node on Existing OpenStack using Packstack

While single-node configurations are acceptable for small environments, testing or POCs most production environments will require a multi-node configuration for various reasons. As we know multi-node configurations group similar OpenStack services and provide scalability as well as the possibility for high availability. One of the great things about OpenStack is the architecture. Every service is […]
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cloud-init and key pair error openstack

Recently we have received the following errors in OpenStack console and  The ssh key could not be injected and the cloud-init cannot contact the server. [ 43.395174] vdb: unknown partition table [ 113.888499] cloud-init[774]: 2016-08-29 20:01:03,415 – url_helper.py[WARNING]: Calling ‘http://169.254.169.254/2009-04-04/meta-data/instance-id’ failed [50/120s]: unexpected error [‘NoneType’ object has no attribute ‘status_code’] [ 164.924980] cloud-init[774]: 2016-08-29 20:01:54,454 – […]
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Enable Nested virtualization openstack cloud

Nested virtualization is guest operating system is itself a hypervisor that virtualizes not just processors and memory but also storage, networking hardware assists, and other resources. The VM hypervisor represents the first implementation of practical nested virtualization with hardware assists for performance. There are a number of hypervisors support nested virtualization though not as efficiently […]
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Increase VM root partition size in ESXi host

Use the following steps to extend the root partition residing in a logical volume created with Logical Volume Manager (LVM) in a virtual machine running Red Hat/CentOS VMs. Increase the root partition size without server reboot in ESXi Host. You can do this simple steps to Increase VM root partition size in ESXi host. If […]
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what is VMware memory balloon driver

The memory balloon driver (vmmemctl) collaborates with the server to reclaim pages that are considered least valuable by the guest operating system. The driver uses a proprietary ballooning technique that provides predictable performance that closely matches the behavior of a native system under similar memory constraints. This technique increases or decreases memory pressure on the […]
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Create Private Gem Server using geminabox

A sinatra based gem hosting app, with client side gem push style functionality. Really simple rubygem hosting. Geminabox lets you host your own gems, and push new gems to it just like with rubygems.org. The bundler dependencies API is supported out of the box. Authentication is left up to either the web server, or the […]
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