What is jlb relay?

Find helpful customer reviews and review ratings for JLB Relay Shaft at Amazon. TLS termination on Network Load Balancers also offers centralized deployment of SSL certificates by integrating with AWS Certificate Manager (. Network Load Balancer — This is the distribution of traffic based on network variables, such as IP address and destination ports. SAP Mobile Platform version 2. JLB may refer to: Jewish Lads' Brigade, a Jewish youth organisation; Johann Ludwig Bach, German composer of the Bach family – specifically the catalogue of.

In August 2016, Amazon Web Services (AWS) introduced Application Load Balancer for Layer 7 load balancing of HTTP and HTTPS traffic. The new product added several features missing from AWS’s existing Layer 4 and Layer 7 load balancer, Elastic Load Balancer, which was officially renamed Classic Load Balancer.

A year later, AWS launched Network Load Balancer for improved Layer 4 load balancing, so the set of choices for users running highly available, scalable applications on AWS includes:

In this post, we review ALB’s features and compare its pricing and features to NGINX Open Source and NGINX Plus.

Notes –

ALB, like Classic Load Balancer or NLB, is tightly integrated into AWS. Amazon describes it as a Layer 7 load balancer – though it does not provide the full breadth of features, tuning, and direct control that a standalone Layer 7 reverse proxy and load balancer can offer.

ALB provides the following features that are missing from Classic Load Balancer:

(For a complete feature comparison of ALB and Classic Load Balancer, see “Product comparisons” in the AWS documentation.)

ALB was a significant update for AWS users who had struggled with Classic Load Balancer’s limited feature set, and it went some way towards addressing the requirements of sophisticated users who need to be able to secure, optimize, and control the traffic to their web applications. However, it still does not provide all the capabilities of dedicated reverse proxies (such as NGINX) and load balancers (such as NGINX Plus).

Rather than using Amazon ALB, users can deploy NGINX Open Source or NGINX Plus on AWS to control and load balance traffic. They can also deploy Classic Load Balancer or Network Load Balancer as a frontend to achieve high availability across multiple availability zones. The table compares features supported by ALB, NGINX, and NGINX Plus.

Note: The information in the following table is accurate as of July 2020, but is subject to change.

* NGINX Controller is now F5 NGINX Management Suite.

Of course, you should evaluate your load balancing choice not by a feature checklist, but by assessing the capabilities you need to deliver your applications flawlessly, with high security, maximum availability, and full control.

Amazon’s Classic Load Balancer (formerly ELB) suffered from a poor response to traffic spikes. Load balancer instances were automatically sized for the current level of traffic, and it could take many minutes for ELB to respond and deploy additional capacity when spikes occurred. Users had to resort to a manual, forms‑based process to request additional resources in advance of traffic spikes (referred to as “pre‑warming”). Because ALB is based on NGINX, ALB instances can handle much more traffic, but you may still observe scaling events in response to traffic spikes. Furthermore, a traffic spike automatically results in greater consumption of Load Balancer Capacity Units (LCUs) and consequently a higher cost.

You can gain complete control over capacity and cost if you deploy and scale your load‑balancing proxies yourself. NGINX and NGINX Plus are deployed within standard Amazon instances, and our sizing guide gives an indication of the potential peak performance of instance types with different capacities. Pricing for NGINX Plus is the same for all instance sizes, so it’s cost‑effective to deploy excess capacity to handle spikes, and it’s quick to deploy more instances – no forms to complete – when more capacity is needed.

Our testing of Amazon ALB indicates that it does not implement “passive” health checks. A server is only detected as having failed once an asynchronous test verifies that it is not returning the expected status code.

We discovered this by creating an ALB instance to load balance a cluster of instances. We configured a health check with the minimum 5-second frequency and minimum threshold of 2 failed checks, and sent a steady stream of requests to the ALB. When we stopped one of the instances, for some requests ALB returned a 502 Bad Gateway error for several seconds until the health check detected the instance was down. Passive health checks (supported by both NGINX and NGINX Plus) prevent these types of errors from being seen by end users.

ALB’s health checks can only determine the health of an instance by inspecting the HTTP status code (such as 200 OK or 404 Not Found). Such health checks are unreliable; for example, some web applications replace server‑generated errors with user‑friendly pages, and some errors are only reported in the body of a web page.

NGINX Plus supports both passive and active health checks, and the latter are more powerful that ALB’s, able to match against the body of a response as well as the status code.

Finally, the biggest question you face if you deploy ALB is cost. Load balancing can be a significant part of your Amazon bill.

AWS uses a complicated algorithm to determine pricing. Unless you know precisely how many new connections, how many concurrent connections, and how much data you will manage each month – which is very hard to predict – and you can run the LCU calculation the same way that Amazon does, you’ll be dreading your Amazon bill each month.

NGINX Plus on AWS gives you complete predictability. For a fixed hourly cost plus AWS hosting charges, you get a significantly more powerful load‑balancing solution with full support.

TLS Offloading Network Load Balancer supports client TLS session termination. This enables you to offload TLS termination tasks to the load balancer, while preserving the source IP address for your back-end applications. You can choose from predefined security policies for your TLS listeners in order to meet compliance and security standards. AWS Certificate Manager (ACM) or AWS Identity and Access Management (IAM) can be used to manage your server certificates.

You can use SNI to serve multiple secure websites using a single TLS listener. If the hostname in the client matches multiple certificates, the load balancer selects the best certificate to use based on a smart selection algorithm. Sticky Sessions Sticky sessions (source IP affinity) are a mechanism to route requests from the same client to the same target. Stickiness is defined at the target group level.

Low Latency Network Load Balancer offers extremely low latencies for latency-sensitive applications.

Preserve source IP address Network Load Balancer preserves the client side source IP allowing the back-end to see the IP address of the client. This can then be used by applications for further processing.

Static IP support Network Load Balancer automatically provides a static IP per Availability Zone (subnet) that can be used by applications as the front-end IP of the load balancer.

Elastic IP support Network Load Balancer also allows you the option to assign an Elastic IP per Availability Zone (subnet) thereby providing your own fixed IP.

DNS Fail-over If there are no healthy targets registered with the Network Load Balancer or if the Network Load Balancer nodes in a given zone are unhealthy, then Amazon Route 53 will direct traffic to load balancer nodes in other Availability Zones.

Integration with Amazon Route 53 In the event that your Network Load Balancer is unresponsive, integration with Route 53 will remove the unavailable load balancer IP address from service and direct traffic to an alternate Network Load Balancer in another region.