Elastic Load Balancing FAQs
(a) ECDSA and RSA certificates
(b) Certificates with different key sizes (e.g. 2K and 4K) for SSL/TLS certificates
(c) Single-Domain, Multi-Domain (SAN) and Wildcard certificates Q: Is IPv6 supported with an Application Load Balancer? Yes, IPv6 is supported with an Application Load Balancer. Q: How do you set up rules on an Application Load Balancer? You can configure rules for each of your listeners you configure for the load balancer. The rules include a condition and a corresponding action if the condition is satisfied. The condition will be a path URL path of a service (e.g. /img) and action is forward. Once you have set this up, the load balancer will use the rules to determine the service to which the request must be routed. Q: Are there limits on the resources for an Application Load Balancer? Your AWS account has these limits for an Application Load Balancer. Q. How can I protect my web applications behind a load balancer from web attacks? You can integrate your Application Load Balancer with AWS WAF, a web application firewall that helps protect web applications from attacks by allowing you to configure rules based on IP addresses, HTTP headers, and custom URI strings. Using these rules, AWS WAF can block, allow, or monitor (count) web requests for your web application. Please see AWS WAF Developer Guide for more information. Q: Can I load balance to any arbitrary IP address? You can use any IP address from the load balancer’s VPC CIDR for targets within load balancer’s VPC and any IP address from RFC 1918 ranges (10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16) or RFC 6598 range (100.64.0.0/10) for targets located outside the load balancer’s VPC (for example, targets in Peered VPC, EC2-Classic and on-premises locations reachable over AWS Direct Connect or VPN connection). Q: How can I load balance applications distributed across a VPC and on-premises location? There are various ways to achieve hybrid load balancing. If an application runs on targets distributed between a VPC and an on-premises location, you can add them to the same target group using their IP addresses. To migrate to AWS without impacting your application, gradually add VPC targets to the target group and remove on-premises targets from the target group. If you have two different applications such that the targets for one application are in a VPC and the targets for other applications are in on-premises location, you can put the VPC targets in one target group and the on-premises targets in another target group and use content based routing to route traffic to each target group. You can also use separate load balancers for VPC and on-premises targets and use DNS weighting to achieve weighted load balancing between VPC and on-premises targets. Q: How can I load balance to EC2-Classic instances? You cannot load balance to EC2-Classic Instances when registering their Instance IDs as targets. However if you link these EC2-Classic instances to the load balancer's VPC using ClassicLink and use the private IPs of these EC2-Classic instances as targets, then you can load balance to the EC2-Classic instances. If you are using EC2 Classic instances today with a Classic Load Balancer, you can easily migrate to an Application Load Balancer. Q: How do I enable cross-zone load balancing in Application Load Balancer? Cross-zone load balancing is already enabled by default in Application Load Balancer. Q: When should I authenticate users using the Application Load Balancer’s integration with Amazon Cognito vs. the Application Load Balancers’ native support for OpenID Connect (IODC) identity providers (IdPs)? You should use authentication through Amazon Cognito if: a. You want to provide flexibility to your users to authenticate via social network identities (Google, Facebook, and Amazon) or enterprise identities (SAML) or via your own user directories provided by Amazon Cognito’s User Pool. b. You are managing multiple identity providers including OpenID Connect and want to create a single authentication rule in ALB, that can use Amazon Cognito to federate your multiple identity providers. c. You have a need to actively manage user profiles with one or more social or OpenID Connect identity providers from one central place. For example, you can put users in groups and add custom attributes to represent user status and control access for paid users. Alternatively, if you have invested in developing custom IdP solutions and simply want to authenticate with a single identity provider that is OpenID Connect-compatible, you may prefer using Application Load Balancer’s native OIDC solution. Q: What type of redirects does ALB support ? The following three types of redirects are supported.
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