VMware VSphere Basic Knowledge

The purpose of virtualization:

Simplify the way IT infrastructure and resources are managed, helping businesses reduce IT resource overhead, consolidate resources, and save costs

Virtualization Classification:

1. Platform Virtualization

Includes infrastructure services and application services

2. Virtualization of resources

3. Application Virtualization

4. Presentation Layer Virtualization

Three Musketeers for virtualized products: VMware, Microsoft, Citrix

The cloud computing system is divided into 3 levels, Iaas,paas,saas

Patterns of cloud computing:

1. Public cloud

2. Private Cloud

3. Hybrid Cloud

4. Industry Cloud

The relationship between cloud computing and virtualization: There is no certainty that cloud computing can be virtualized, but to improve resource utilization and ease of management, cloud computing still needs to be implemented with virtualization, and virtualization is just one way to achieve cloud computing.

About ESXi:

ESXi is an important part of the vsphere product suite, which is responsible for translating the computer's physical resources into logical resources to ensure efficient use of computer resources.

Software that detects whether the CPU supports virtualization software, Securable

VMware VSphere Virtual Network and physical network connectivity

Virtual network cards for virtual machines---> Port groups for virtual switches-----> physical computer network cards----> Physical switches

Port group: Virtual network in the virtual switch, multiple ports can be divided into a group, thereby forming a port group, virtual network cards of different virtual machines can be connected to the same port group

The standard virtual switch is the concept of a physical host, and after the HA cluster, two or more physical host groups are built into a cluster, a virtual distributed Virtual switch is formed.

When you create a port group, you fill in the Vlan-id information, which is the virtual VLAN in the virtual network, which means that the port group allows the data communication of the virtual VLAN, and when the virtual machine is created, the port group name can be selected. This ensures that only hosts in the same port group and VLAN can communicate.

Standard Virtual Switch-built virtual local area network, only two virtual machines on the same physical host to communicate properly

Vmkernel Network:

The Vmkernel network interface provides network connectivity for hosts and handles VMware vMotion, IP storage, and fault tolerance

The standard virtual switch has two drawbacks:

1. This type of virtual switch must be configured on each ESXI host

2. When migrating a virtual machine using VMware vMotion, the network connection status is reset

VSphere Distributed switch (distributed switch) setting up network Connections

With vsphere distributed switch, you can make a virtual switch span multiple servers. One end of the virtual switch is connected to the port group of the virtual machine and the other end is connected to the uplink of the physical Ethernet adapter on the service. The virtual machine is connected to the physical environment through a physical Ethernet adapter connected to the virtual Switch uplink

VMware VSphere Storage

1. Local or LUN

2.NFS

3.iSCSI (Internet small Computer system interface) disk

A. Software iSCSI Adapter

B. Software iSCSI Adapter

1. Ethernet Card + software mode

2. Hardware Toe Nic Implementation method

3.iSCSI HBA Card Implementation method

VMware VSphere vMotion

VMotion is the foundation of the entire virtualization advanced function, only realizes the VMotion function, can realize ha, ft and so on function.

VMotion can also migrate virtual machines with zero down time

VSphere vMotion is divided into vMotion and storage vMotion

VMotion implementation When migrating virtual machines, the file system of the virtual machine is always on shared shared storage, only the configuration files are migrated

Storage VMotion is a full migration, including file system and configuration files migrating from one data store to another data store

Both vMotion and storage vMotion require a dedicated Vmkernel network to migrate virtual machines

Using Vmotion to migrate both virtual machines and data stores must be in the virtual machine state, if the separate migration does not require shutdown

Resource pool

Resource pools can be grouped into hierarchies that are used to partition the available CPU and memory resources hierarchically, the resource pools are isolated from each other, and the resource pools are shared internally;

Resource pools are primarily management allocations for multi-CPU and memory resources that automatically request resources to the parent resource pool when resources are low, and the virtual machines under the resource pool do not boot

VAPP

A vapp is a logical or logical container of one or more virtual institutions that can be managed as a unit; a vapp is a container that resembles a resource pool and can contain one or more virtual machines, and the Vapp metadata resides in the database of the vcenter server. The vapp can therefore be distributed across multiple ESXi hosts

VSphere Cluster

VSphere clusters include DRS clusters, ha clusters, DPM clusters

DRS: Distributed resource scheduling, used to dynamically adjust the load of host in cluster, automatically allocate resources, and finally achieve the balance of host resource consumption in the whole cluster

A DRS cluster is a group of hosts and associated virtual machines with shared resources and shared management interfaces;

DRS allocates resources in two ways:

1. Migrate the virtual machine to another host with sufficient resources

2. Migrate other virtual machines on the server, freeing up more space for the virtual machine

HA: High availability for accidental failover

DPM: Distributed power management, used to dynamically "centralize" virtual machines to less-than-departmental hosts in cluster when the load is low, and other hosts standby to conserve power

VMware VSphere high availability and dual machine hot standby

Ha is a group of ESXi server-based clustering functions, the main purpose is to be able to transfer the host in time when the virtual machine fails, avoid long downtime

FT (Fault tolerance) dual standby is to ensure that the maximum time the virtual machine does not stop, the virtual machine in a dual-machine hot-standby mode at the same time in two host running

Enable the FT feature, primarily to create a copy of the virtual machine for the hot standby function. While the primary and secondary virtual machines cannot be on the same physical host

P2V, V2V Migration Tool

dynamic conversion between physical and virtual machines using the P2V, V2V Migration Tool vmware vCenter Converter

VMware Update Management

VMware vsphere Update Manager eliminates the hassle of manually tracking and patching VMware vsphere hosts and virtual machines in addition to automatically managing patches

Virtualized backup Tools

VMware data Recovery disk-based backup and recovery for fast, simple, and comprehensive virtual machine protection.

Enterprise-Class virtual desktop VMware View

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VMware VSphere Basic Knowledge