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Questions and Answers
Which communication protocol requires an additional layer of WS-Security for working with HTTPS?
What aspect of REST makes it a better choice for modern applications like mobile apps?
Which API type is recommended to use REST according to the text?
Why does REST not require additional overheads when supporting HTTPS?
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Which design aspect do modern applications benefit from when using REST APIs?
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What makes SOAP more reliable compared to REST according to the text?
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In what scenario might you be better off continuing with SOAP instead of REST?
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What is the purpose of WS-Security in SOAP messages?
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What type of applications work better with REST APIs according to the text?
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Which API type may benefit from the tighter security measures in WSSecurity provided by SOAP?
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Study Notes
ESXi Overview
- Type 1 hypervisor developed by VMware, installs directly on physical servers.
- Key Components:
- Unix Microkernel
- VMware Kernel (VMkernel)
vCenter and vSphere Client
- vCenter: Manages ESXi servers and virtualized data center components on a dedicated server.
- vSphere Client: GUI program enabling remote connection to vCenter and ESXi for administration.
Server Virtualization Benefits
- Enhances efficiency by allowing multiple virtual machines (VMs) to run on a single server.
- Allocates computing resources effectively by using less hardware.
Storage Virtualization
- Pooled storage capacity distributed to VMs through:
- Creation of logical storage partitions, known as LUNs (Logical Unit Numbers).
- LUNs are utilized to develop a datastore.
- VMs utilize VMDK (.vmdk) files stored in datastores for storage, while VM configuration files are saved as VMX (.vmx) files.
Network Virtualization
- Transforms physical network components into a virtual network.
- vSwitch: A virtual switch enabling communication between virtual devices.
- VLAN: A method for network segmentation that allows for the consolidation of applications.
Cloud Computing Fundamentals
- Cloud computing: On-demand delivery of shared computing resources, software, or data via the internet.
- Major service models:
- Software as a Service (SaaS)
- Platform as a Service (PaaS)
- Infrastructure as a Service (IaaS)
- Cloud deployment models vary by control and location, including:
- Private Cloud
- Community Cloud
- Public Cloud
- Hybrid Cloud
Virtual Machine Movements
- vMotion: Facilitates live migration of running VMs between ESXi hosts without interruption, enhancing resource availability.
- Storage vMotion: Moves running VM disks and configurations between datastores while maintaining service continuity.
High Availability (HA) and Distributed Resource Scheduler (DRS)
- HA: Clusters hosts and VMs to ensure that VMs on failed hosts restart on functioning alternate hosts.
- DRS: Manages resource distribution in HA clusters for optimal performance and monitoring.
SOAP APIs
- SOAP: A rigid communication protocol with standards for data exchange.
- Related standards include:
- WS-Security for secure messaging with tokens.
- WS-Addressing for routing metadata inclusion.
- WS-ReliableMessaging standardizing error handling.
- WSDL: Describes service scope and functionality.
- SOAP requests are sent wrapped in a SOAP envelope, allowing for communication across various transport protocols and always return XML documents.
REST APIs
- REST: Architectural style for API development adhering to six key principles:
- Client-server architecture allows independent technology and platform.
- Layered system enables multiple intermediaries in server communication.
- Uniform interface mandates standard data format for usability.
- Stateless requests ensure independence of each operation.
- Cacheable responses enhance efficiency in data retrieval.
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Description
Learn about the components of VMware ESXi, a Type 1 hypervisor software, including the Unix Microkernel, VMware Kernel (VMkernel), vCenter, and vSphere Client. Explore how server virtualization is achieved through these components.
