Question:- Name the commands used to pause and un-pause(resume) an instance
Answer:- $ novaunpause INSTANCE_NAME $ nova pause INSTANCE_NAME
Question:- List the storage locations for VM images in OpenStack
Answer:- OpenStack Object Storage • Filesystem • S3 • HTTP • RBD or Rados Block Device • GridFSMaster Openstack from industry experts.
Question:- What is Token?
Answer:- Token is a type of authentication similar to password-based validation. A token gets generated once the user inserts the credentials and authenticates as a Keystone user. The token can then be used to access OpenStack services without any revalidation. It is interesting to note that a token is active for a limited period and must be renewed after regular intervals. To create a token, users first need to authenticate their Keystone credentials.
Question:- What is OpenStack Python SDK?
Answer:- Python SDK (Software Development Kit) helps users to write applications for performing automation tasks in Python by calling Python objects. It provides a platform to work with multiple OpenStack services at one place. It consists of language bindings to access OpenStack clouds, complete API reference, easy interaction with REST API and sample code for initial applications.
Question:- Describe the function of Filter Scheduler.
Answer:- The Filter Scheduler facilitates filtering and weighting to notify where a new instance can be created. It supports working with Compute Nodes. Filter Scheduler firstly creates an unfiltered dictionary of hosts and then filter them using related properties and makes the final selection of hosts for the number of instances as needed.
Question:- Define the Networking option in OpenStack.
Answer:- • AvalabilityZoneFilter: filters hosts by their availability zone. • CapacityFilter: filtering based on volume host’s capacity consumption • DifferentBackendFilter: Scheduling volumes to a different back-end • DriverFilter: filters based on ‘filter function’ and ‘metrics’ • InstanceLocalityFilter • JSONFIlter • RetryFilter: Filter the previously attempted hosts • SameBackendFilterMost in-depth, industry-led curriculum in Openstack.
Question:- List down the Networking hardware in OpenStack.
Answer:- • Networks • Routers • Subnets • Ports Vendor Plugins
Question:- Define Hypervisor
Answer:- For all cloud computing paltforms, Hypervisor is a term to define virtual machine monitor (VMM) including hardware, software and firmware components running on a virtual machine. Host machine is the one having hypervisor with one or more virtual machines. OpenStack Compute allows multiple hypervisors. There are functionalities to choose one among them for a specific purpose.
Question:- List down the type of Hypervisors supported by OpenStack.
Answer:- • KVM (Kernel-based Virtual machine) • LXC: Linux Containers having Linux-based VMs • QEMU: Quick EMUlator used for development purposes • UML: User Mode Linux used for development purposes • VMware vSphere: VMware-based Linux and Windows via vCenter server connection. • Hyper-V: Server virtualization with Microsoft’s Hyper-V
Question:- Explain in brief the modular architecture of OpenStack.
Answer:- The three important components of OpenStack modular architecture are: • OpenStack Compute: For managing large networks on the virtual machine • Image Service: The delivery service provides discovery and registration for virtual disk images • OpenStack Object Storage: A storage system that provides support for both block storage and object storage
Question:- What command manages floating IP addresses in OpenStack
Answer:- nova floating-ip-*
Question:- Define bare-metal node.
Answer:- Bare-metal node grants access to control bare-metal driver that handles the provisioning of OpenStack Compute physical hardware utilizing the standard cloud APIs and tools like Heat. It is generally used for single tenant clouds like high-performance cluster computing. For using the bare-metal driver, a network interface must be created with the bare-metal node inserted into it. Afterwards, users can launch an instance from the node. Users can also list and delete bare-metal nodes by removing the associated network instances
Question:- List down the components of OpenStack Compute
Answer:- Nova (Compute) Cloud comprises following components: • API server • Message Queue (Rabbit-MQ Server) • Compute Workers (Nova-Compute) • Network controller (Nova-Network) • Volume Worker • Scheduler
Question:- Define the role of API Server.
Answer:- It provides an interface for the external world to interact with the cloud infrastructure.