Back-end health : Application Gateway provides the capability to monitor the health of the servers in the back-end pools through the Azure portal and through PowerShell. You can also find the health of the back-end pools through the performance diagnostic logs.
Logs : Logs allow for performance, access, and other data to be saved or consumed from a resource for monitoring purposes. Metrics : Application Gateway has several metrics which help you verify that your system is performing as expected. This article has been updated to use the new Azure PowerShell Az module. You can still use the AzureRM module, which will continue to receive bug fixes until at least December Application Gateway provides the capability to monitor the health of individual members of the back-end pools through the portal, PowerShell, and the command-line interface CLI.
You can also find an aggregated health summary of back-end pools through the performance diagnostic logs. The back-end health report reflects the output of the Application Gateway health probe to the back-end instances. When probing is successful and the back end can receive traffic, it's considered healthy. Otherwise, it's considered unhealthy.
This port range is required for Azure infrastructure communication. They are protected locked down by Azure certificates. Without proper certificates, external entities, including the customers of those gateways, will not be able to initiate any changes on those endpoints. In the portal, back-end health is provided automatically. Back-end pool name, port, back-end HTTP settings name, and health status are shown. Valid values for health status are HealthyUnhealthyand Unknown.
You can use different types of logs in Azure to manage and troubleshoot application gateways. You can access some of these logs through the portal.
You can learn more about the different types of logs from the following list:. Logs are available only for resources deployed in the Azure Resource Manager deployment model. You cannot use logs for resources in the classic deployment model.Protect your applications from common web vulnerabilities such as SQL injection and cross-site scripting.
Azure Application Gateway features
Monitor your web applications using custom rules and rule groups to suit your requirements and eliminate false positives. Get application-level load-balancing services and routing to build a scalable and highly available web front end in Azure. Autoscaling offers elasticity by automatically scaling Application Gateway instances based on your web application traffic load. Application Gateway is integrated with several Azure services.
Azure Traffic Manager supports multiple-region redirection, automatic failover, and zero-downtime maintenance. Azure Monitor and Azure Security Center provide centralized monitoring and alerting, and an application health dashboard.
Key Vault offers central management and automatic renewal of SSL certificates. Route traffic to back-end server pools with URL path-based routing, and to multiple web applications using host header-based routing.
Frequently asked questions about Application Gateway
Scale your web application with SSL offload, and centralize SSL certificate management to reduce encryption and decryption overhead on your servers. Microsoft Azure enables us to quickly respond to changing traffic on spaactor.
Above all, our internet search engine for spoken content is easily scalable and available through the Azure infrastructure worldwide. The month payback and percent internal rate of return prove that migrating SAP to Azure was the right decision.
Metrics for Application Gateway
TalkTalk TV is a fast changing organization looking to embrace new and better ways of working whilst delivering the best customer experience. In a short span of time, Azure Service Fabric and the extended suite of Azure services has boosted agility, allowing the engineering team to implement outstanding quality microservices with a small number of developers.
Learn how to use Application Gateway with 5-minute quickstart tutorials and documentation. Enhance Application Gateway with additional features and products, like security and backup services.
Home Services Application Gateway. Build secure, scalable, and highly available web front ends in Azure. Start free. Platform-managed, scalable, and highly available application delivery controller as a service Centralized SSL offload and SSL policy Web application firewall Protect your applications from common web vulnerabilities such as SQL injection and cross-site scripting.
Scalable, highly available web application delivery Get application-level load-balancing services and routing to build a scalable and highly available web front end in Azure. Tight integration with Azure Application Gateway is integrated with several Azure services. End-to-end SSL Strong encryption from front end to back end helps to secure your data. Layer 7 intelligent routing Route traffic to back-end server pools with URL path-based routing, and to multiple web applications using host header-based routing.
Efficient SSL offload and certificate management Scale your web application with SSL offload, and centralize SSL certificate management to reduce encryption and decryption overhead on your servers. Microsoft invests more than USD 1 billion annually on cybersecurity research and development.
We employ more than 3, security experts completely dedicated to your data security and privacy. Azure has more compliance certifications than any other cloud provider. View the comprehensive list. Learn more about security on Azure. Application Gateway pricing No upfront cost No termination fees Pay only for what you need Per-minute billing. Learn more about Application Gateway pricing.The v2 SKU offers performance enhancements and adds support for critical new features like autoscaling, zone redundancy, and support for static VIPs.
Autoscaling also removes the requirement to choose a deployment size or instance count during provisioning. This SKU offers true elasticity. Fixed capacity mode is useful for scenarios with consistent and predictable workloads.
Autoscaling mode is beneficial in applications that see variance in application traffic. You can choose a single zone or multiple zones where Application Gateway instances are deployed, which makes it more resilient to zone failure. The backend pool for applications can be similarly distributed across availability zones.
Zone redundancy is available only where Azure Zones are available. In other regions, all other features are supported. For more information, see What are Availability Zones in Azure? This ensures that the VIP associated with the application gateway doesn't change for the lifecycle of the deployment, even after a restart.
This also includes WAF configuration changes. With the v2 SKU, the pricing model is driven by consumption and is no longer attached to instance counts or sizes. The v2 SKU pricing has two components:. Each capacity unit is composed of at most: 1 compute unit, or persistent connections, or 2. Each instance can currently support approximately 10 capacity units. The number of requests a compute unit can handle depends on various criteria like TLS certificate key size, key exchange algorithm, header rewrites, and in case of WAF incoming request size.
We recommend you perform application tests to determine request rate per compute unit. Both capacity unit and compute unit will be made available as a metric before billing starts. For more pricing information, see the pricing page. Assuming connections are short lived, your price would be:.
Assuming that there is no traffic and connections are short lived, your price would be:. In this case, you're billed for the entirety of the five instances even though there is no traffic. Assuming connections are short lived, and that compute unit calculation for the application supports 10 RPS per compute unit, your price would be:. The autoscaling v2 SKU now supports default health probes to automatically monitor the health of all resources in its back-end pool and highlight those backend members that are considered unhealthy.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have a Visual Studio load test that runs through the pages on a website, but have experienced big differences in performance when using a load balancer.
If I run the tests going straight to Web Server 1 bypassing the load balancer I get an average page load time of under 1 second for users as an example.
If I direct the same test at the load balancer with 2 web servers behind it then I get an average page load time of about 30seconds - it starts quick but then deteriorates.
This is strange as I now have 2 web servers load balanced instead of using 1 direct so I expect to be able to increase load. I have experienced the same problem previously with an NGinx setup, I thought it was due to that setup but now I find I have the same on Azure. Any thoughts would be great. I had to completely disable the firewall to get the consistent performance.
I also ran into other issues with the firewall, where it gave us max entity size errors from a security module and after discussing with Azure Support this entity size can not be configured so keeping the firewall would mean some large pages would no longer function and get this error.
NET web forms site. I have now simulated 1, concurrent users split between two test agents and the performance was good for our site, with average page load time well under a second. Learn more. Asked 2 years, 10 months ago. Active 2 years, 8 months ago. Viewed 2k times. John Corker John Corker 10 10 bronze badges. What size of web app gateway? Started with medium WAF gateway, 2 instances. Changed these to large and got near exactly the same results from a 15min user load.
I have the exact same thing. Did you get it resolved? Hi, I had to completely disable the firewall to get the performance.
I also ran into other issues with the firewall, where it gave us max entity size errors from a security module and after discussing with Azure Support this entity size can not be configured so keeping the firewall would be some large pages would no longer function and get this error. Active Oldest Votes. Here are a list of things that helped me to improve the same situation: Add non-SSL listener and use that e.
Obviously this is not the advised solution but maybe that can give you a hint offload SSL to the backend pool servers? Add more gateway instances? Muzikant Muzikant 7, 4 4 gold badges 46 46 silver badges 82 82 bronze badges. The Overflow Blog. The Overflow How many jobs can be done at home? Featured on Meta. Community and Moderator guidelines for escalating issues via new response….
Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow.Azure Application Gateway is a web traffic load balancer that enables you to manage traffic to your web applications. For example, you can route traffic based on the incoming URL. This type of routing is known as application layer OSI layer 7 load balancing.
Azure Application Gateway documentation
Azure provides a suite of fully managed load-balancing solutions for your scenarios. Your end-to-end scenarios may benefit from combining these solutions. For an Azure load-balancing options comparison, see Overview of load-balancing options in Azure. For Application Gateway pricing information, see Application Gateway pricing. You may also leave feedback directly on GitHub. Skip to main content. Exit focus mode. Learn at your own pace.
See training modules. Dismiss alert. What is Azure Application Gateway? Note Azure provides a suite of fully managed load-balancing solutions for your scenarios.
Is this page helpful? Yes No. Any additional feedback? Skip Submit. Send feedback about This product This page. This page. Submit feedback. There are no open issues. View on GitHub.Application Gateway publishes data points, called metrics, to Azure Monitor for the performance of your Application Gateway and backend instances.
These metrics are numerical values in an ordered set of time-series data that describe some aspect of your application gateway at a particular time. If there are requests flowing through the Application Gateway, it measures and sends its metrics in second intervals.
If there are no requests flowing through the Application Gateway or no data for a metric, the metric is not reported. For more information, see Azure Monitor metrics. If there are more than one listener in the Application Gateway, then always filter by Listener dimension while comparing different latency metrics in order to get meaningful inference. In case of TLS, it also includes the time spent on handshake.
Time interval between start of establishing a connection to backend server and receiving the first byte of the response header. This approximates the sum of Backend connect timetime taken by the request to reach the backend from Application Gateway, time taken by backend application to respond the time the server took to generate content, potentially fetch database queriesand the time taken by first byte of the response to reach the Application Gateway from the backend.Load Balancer and Application Gateway
Time interval between start of establishing a connection to backend server and receiving the last byte of the response body. This approximates the sum of Backend first byte response time and data transfer time this number may vary greatly depending on the size of objects requested and the latency of the server network.
This is the interval from the time when Application Gateway receives the first byte of the HTTP request to the time when the last response byte has been sent to the client. This includes the processing time taken by Application Gateway, the Backend last byte response timetime taken by Application Gateway to send all the response and the Client RTT.
These metrics can be used to determine whether the observed slowdown is due to the client network, Application Gateway performance, the backend network and backend server TCP stack saturation, backend application performance, or large file size. On the other hand, if the spike in Backend first byte response time is associated with a corresponding spike in Backend connect timethen it can be deduced that either the network between Application Gateway and backend server or the backend server TCP stack has saturated.
If you notice a spike in Backend last byte response time but the Backend first byte response time is stable, then it can be deduced that the spike is because of a larger file being requested.
Similarly, if the Application gateway total time has a spike but the Backend last byte response time is stable, then it can either be a sign of performance bottleneck at the Application Gateway or a bottleneck in the network between client and Application Gateway.
Additionally, if the client RTT also has a corresponding spike, then it indicates that that the degradation is because of the network between client and Application Gateway. Count of capacity units consumed to load balance the traffic.
There are three determinants to capacity unit - compute unit, persistent connections and throughput. Each capacity unit is composed of at most: 1 compute unit, or persistent connections, or 2. Count of processor capacity consumed. With the v2 SKU, the pricing model is driven by consumption.This article has been updated to use the new Azure PowerShell Az module.
You can still use the AzureRM module, which will continue to receive bug fixes until at least December It offers various layer 7 load-balancing capabilities for your applications.
This service is highly available, scalable, and fully managed by Azure. For a full list of supported features, see Introduction to Application Gateway. It supports capabilities such as SSL termination, cookie-based session affinity, and round robin for load-balancing traffic. See supported backend resources.
Application Gateway is available in all regions of global Azure. Redirection is supported. See Application Gateway redirect overview. See the order of listener processing.
Or find it in the portal, on the overview page for the application gateway. If you're using internal IP addresses, find the information on the overview page. Keep-Alive timeout governs how long the Application Gateway will wait for a client to send another HTTP request on a persistent connection before reusing it or closing it.
But the DNS name associated with the application gateway doesn't change over the lifetime of the gateway. See Application Gateway subnet size considerations. In addition to multiple instances of a given Application Gateway deployment, you can provision another unique Application Gateway resource to an existing subnet that contains a different Application Gateway resource.
Yes, but only specific scenarios. For more information, see Application Gateway configuration overview. See Modifications to a request. Changes to instance size or count aren't disruptive, and the gateway remains active during this time. Most deployments that use the v2 SKU take around 6 minutes to provision.
However it can take longer depending on the type of deployment.