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The term load balancing refers to the distribution of workloads across multiple computing resources. Load balancing aims to optimize resource use, maximize throughput, minimize response time, and avoid overloading any single resource. It can also improve availability by sharing a workload across redundant computing resources.
Azure provides various load balancing services that you can use to distribute your workloads across multiple computing resources - Application Gateway, Front Door, Load Balancer, and Traffic Manager.
This article describes how you can use the Azure Load Balancing hub page in the Azure portal to determine an appropriate load-balancing solution for your business needs.
Overview
Azure load balancing services can be categorized along two dimensions: global versus regional, and HTTP(S) versus non-HTTP(S). Avstar mobile phones & portable devices driver download.
Global versus regional
Global load-balancing services distribute traffic across regional backends, clouds, or hybrid on-premises services. These services route end-user traffic to the closest available backend. They also react to changes in service reliability or performance, in order to maximize availability and performance. You can think of them as systems that load balance between application stamps, endpoints, or scale-units hosted across different regions/geographies.
Regional load-balancing services distribute traffic within virtual networks across virtual machines (VMs) or zonal and zone-redundant service endpoints within a region. You can think of them as systems that load balance between VMs, containers, or clusters within a region in a virtual network.
HTTP(S) versus non-HTTP(S)
HTTP(S) load-balancing services are Layer 7 load balancers that only accept HTTP(S) traffic. They are intended for web applications or other HTTP(S) endpoints. They include features such as SSL offload, web application firewall, path-based load balancing, and session affinity.
Non-HTTP/S load-balancing services can handle non-HTTP(S) traffic and are recommended for non-web workloads.
The following table summarizes the Azure load balancing services by these categories:
| Service | Global/regional | Recommended traffic |
|---|---|---|
| Azure Front Door | Global | HTTP(S) |
| Traffic Manager | Global | non-HTTP(S) |
| Application Gateway | Regional | HTTP(S) |
| Azure Load Balancer | Global | non-HTTP(S) |
Azure load balancing services
Here are the main load-balancing services currently available in Azure:
Front Door is an application delivery network that provides global load balancing and site acceleration service for web applications. It offers Layer 7 capabilities for your application like SSL offload, path-based routing, fast failover, caching, etc. to improve performance and high-availability of your applications.
Note
At this time, Azure Front Door does not support Web Sockets.
Traffic Manager is a DNS-based traffic load balancer that enables you to distribute traffic optimally to services across global Azure regions, while providing high availability and responsiveness. Because Traffic Manager is a DNS-based load-balancing service, it load balances only at the domain level. For that reason, it can't fail over as quickly as Front Door, because of common challenges around DNS caching and systems not honoring DNS TTLs.
Application Gateway provides application delivery controller (ADC) as a service, offering various Layer 7 load-balancing capabilities. Use it to optimize web farm productivity by offloading CPU-intensive SSL termination to the gateway.
Azure Load Balancer is a high-performance, ultra low-latency Layer 4 load-balancing service (inbound and outbound) for all UDP and TCP protocols. It is built to handle millions of requests per second while ensuring your solution is highly available. Azure Load Balancer is zone-redundant, ensuring high availability across Availability Zones.
Choose a load balancing solution using Azure portal
You can use the Azure Load Balancing page in the Azure portal to help you guide to the right load-balancing solution for your business need. Azure Load Balancing includes the decision making queries described in the workflow of the following section and can be accessed as follows:
Sign in to the Azure portal at https://portal.azure.com.
In the Search resources, services, and docs box at the top of the portal, type load balancing. When Load balancing appears in the search results, select it.
Note
To learn about some of the factors considered in selecting a load-balancing solution, see Decision tree for load-balancing in Azure in this article.
In the Load balancing - help me choose (Preview) page, do one of the following:
To find the appropriate load-balancing solution for your business, follow instructions in the default Help me choose tab.
To learn about the supported protocols and service capabilities of each load balancing service, select the Service comparisons tab.
To access free training on load balancing services, select the Tutorial tab.
Reference architecture examples
The following table lists various architecture reference articles based on the load-balancing services used as a solution.
| Service(s) | Article | Description |
|---|---|---|
| Load Balancer | Load balance virtual machines (VMs) across availability zones | Load balance VMs across availability zones helps to protect your apps and data from an unlikely failure or loss of an entire datacenter. With zone-redundancy, one or more availability zones can fail and the data path survives as long as one zone in the region remains healthy. |
| Front Door | Sharing location in real time using low-cost serverless Azure services | Use Azure Front Door to provide higher availability for your applications than deploying to a single region. If a regional outage affects the primary region, you can use Front Door to fail over to the secondary region. |
| Application Gateway | IaaS: Web application with relational database | Learn how to use resources spread across multiple zones to provide a high availability (HA) architecture for hosting an Infrastructure as a Service (IaaS) web application and SQL Server database. |
| Traffic Manager | Multi-tier web application built for high availability and disaster recovery | Deploy resilient multi-tier applications built for high availability and disaster recovery. If the primary region becomes unavailable, Traffic Manager fails over to the secondary region. |
| Azure Front Door + Application Gateway | Multitenant SaaS on Azure | Use a multi-tenant solution that includes a combination of Front Door and Application Gateway. Front Door helps load balance traffic across regions and Application Gateway routes and load-balances traffic internally in the application to the various services that satisfy client business needs. |
| Traffic Manager + Load Balancer | Multi-region N-tier application | A multi-region N-tier application that uses Traffic Manager to route incoming requests to a primary region and if that region becomes unavailable, Traffic Manager fails over to the secondary region. |
| Traffic Manager + Application Gateway | Multi-region load balancing with Traffic Manager and Application Gateway | Learn how to serve web workloads and deploy resilient multi-tier applications in multiple Azure regions, in order to achieve high availability and a robust disaster recovery infrastructure. |
Decision tree for load balancing in Azure
When selecting the load-balancing options, here are some factors that are considered when you select the Help me choose default tab in Azure load balancing:
- Traffic type. Is it a web (HTTP/HTTPS) application? Is it public facing or a private application?
- Global versus. regional. Do you need to load balance VMs or containers within a virtual network, or load balance scale unit/deployments across regions, or both?
- Availability. What is the service SLA?
- Cost. See Azure pricing. In addition to the cost of the service itself, consider the operations cost for managing a solution built on that service.
- Features and limits. What are the overall limitations of each service? See Service limits.
The following flowchart will help you to choose a load-balancing solution for your application. The flowchart guides you through a set of key decision criteria to reach a recommendation.
Treat this flowchart as a starting point. Every application has unique requirements, so use the recommendation as a starting point. Then perform a more detailed evaluation.
If your application consists of multiple workloads, evaluate each workload separately. A complete solution may incorporate two or more load-balancing solutions.
Definitions
Internet facing. Applications that are publicly accessible from the internet. As a best practice, application owners apply restrictive access policies or protect the application by setting up offerings like web application firewall and DDoS protection.
Global. End users or clients are located beyond a small geographical area. For example, users across multiple continents, across countries/regions within a continent, or even across multiple metropolitan areas within a larger country/region.
PaaS. Platform as a service (PaaS) services provide a managed hosting environment, where you can deploy your application without needing to manage VMs or networking resources. In this case, PaaS refers to services that provide integrated load balancing within a region. See Choosing a compute service – Scalability.
IaaS. Infrastructure as a service (IaaS) is a computing option where you provision the VMs that you need, along with associated network and storage components. IaaS applications require internal load balancing within a virtual network, using Azure Load Balancer.
Application-layer processing refers to special routing within a virtual network. For example, path-based routing within the virtual network across VMs or virtual machine scale sets. Abaxis driver download for windows. For more information, see When should we deploy an Application Gateway behind Front Door?.
Next steps
CE Instructions for
WB4460: COVID-19 Vaccine Training: General Overview of Immunization Best Practices for Healthcare Providers
(Credit expires 12/15/2022)
Overview Effect
Due to the ever-changing dynamics of COVID vaccine, content is subject to change. Please refer back to the online course for the most up-to-date content.
To receive continuing education (CE)
In order to receive continuing education (CE) for WB4460 COVID-19 Vaccine Training: General Overview of Immunization Best Practices for Healthcare Providers, please visit TCEO at www.cdc.gov/getCE and follow the 9 Simple Steps by 12/15/2022. Pass the posttest at 80%.
If you have any questions or problems, contact CDC/ATSDR Training and Continuing Education Online via email at ce@cdc.gov. You may also contact the CE Coordinator at NCIRD, Melissa Barnett at MBarnett2@cdc.gov
PROGRAM DESCRIPTION: CDC has created a new, web-on-demand, self-paced module for healthcare providers who will be administering Pfizer-BioNTech COVID-19 Vaccine. This module will provide information to healthcare professionals about COVID-19 vaccine manufactured by Pfizer Pharmaceuticals, based on the recommendations of the Advisory Committee on Immunization Practices and guidance from the manufacturer.
OBJECTIVES: At the conclusion of the session, the participant will be able to:
Describe the Vaccine Safety, Development, and Emergency Use Authorization (EUA) mechanism to provide approval for COVID-19 vaccines.
Describe the general storage and handling requirements for COVID-19 vaccines.
Describe the general vaccine administration procedures for COVID-19 vaccines.
Describe documentation and reporting procedures for adverse events associated with COVID-19 Vaccines.
Locate current immunization resources to increase knowledge of team’s role in program implementation for improved team performance.
Implement disease detection and prevention health care services (e.g., smoking cessation, weight reduction, diabetes screening, blood pressure screening, immunization services) to prevent health problems and maintain health.
FACULTY/CREDENTIALS:
Andrew Kroger, MD, MPH, Medical Officer, CDC/NCIRD
JoEllen Wolicki, BSN, RN, Nurse Educator, CDC/NCIRD
ORIGINATION DATE: 12/15/2020 EXPIRATION DATE: 12/15/2022
URL: https://www2.cdc.gov/vaccines/ed/covid19/pfizer/index.asp
HARDWARE/SOFTWARE: Computer Hardware; Internet connection; Browser; MATERIALS: Internet connection and computer
TARGET AUDIENCE: Physicians, PAs, Advanced Practice Nurses, RNs, Pharmacists
PREREQUISITES: Participants should have a basic educational background in science including general knowledge in the subject areas of biology, immunization and vaccine-preventable diseases.
FORMAT: This course is Enduring material.
| In support of improving patient care, The Centers for Disease Control and Prevention is jointly accredited by the Accreditation Council for Continuing Medical Education (ACCME), the Accreditation Council for Pharmacy Education (ACPE), and the American Nurses Credentialing Center (ANCC), to provide continuing education for the healthcare team. |
Com21 network & wireless cards driver download for windows. CME: The Centers for Disease Control and Prevention designates this Enduring activity for a maximum of .25 AMA PRA Category 1 Credits™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.
CNE: The Centers for Disease Control and Prevention designates this activity for .25 nursing contact hours.
CPE: The Centers for Disease Control and Prevention designated this knowledge-based event for pharmacists to receive 0.025 CEUs in pharmacy education (0.25 contact hours). The Universal Activity Number is JA4008229-0000-20-181-H06-P.
Overview Charts
Once credit is claimed, an unofficial statement of credit is immediately available on TCEOnline. Official credit will be uploaded within 60 days on the NABP/CPE Monitor.
DISCLOSURE: In compliance with continuing education requirements, all presenters must disclose any financial or other associations with the manufacturers of commercial products, suppliers of commercial services, or commercial supporters as well as any use of unlabeled product(s) or product(s) under investigational use.
CDC, our planners, content experts, and their spouses/partners wish to disclose they have no financial interests or other relationships with the manufacturers of commercial products, suppliers of commercial services, or commercial supporters. Planners have reviewed content to ensure there is no bias.
Content will not include any discussion of the unlabeled use of a product or a product under investigational use.
Sample Of An Overview
CDC did not accept commercial support for this continuing education activity.
FEES: No fees are charged for CDC’s CE activities.
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