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What are the three types of ELB(Elastic Load Balancer?
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Application Load Balancers (ALB)
Network Load Balancer(ELB) Classic Load Balancer(CLB) |
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We have a Elastic Load Balancer<br />
Behind of ELB we have a Auto Scaling Group<br /> Inside of the AutoScaling have EC2<br /> We only need access the application via DNS insted of EC2 IP public |
Is necessary 2 public subnets for the ELB<br />
Is necessary 2 private subnet for the ASG<br /> Is necessary 3 NAT Gateways |
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Which protocol support a ALB?
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HTTP and HTTPS
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What means a SNI on a ALB?
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ALB supports Server Name Indication (SNI), enabling hosting multiple domain names with different TLS certificates behind a single ALB.
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Network Load Balancing is best for?
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Balancing TCP traffic. Operate in the Layer 4. Use where you need extreme performance.
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Is posible decrypt traffic whit NLB?
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Yes, but is necessary install certificate on the NLB.
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How we automatically regenerate a TLS certification in case of temination?
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Using AWS Certificate Manager is a preferred option, as these certificates are automatically renewed on expiry.
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If you need the IPv4 of your end user using CLB?
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Look for the X-forwarded-for header.
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Sticky sessions
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Usefull if you are storing information locally to that instances.<br />
<br /> If a load balancer continues to direct traffic a EC2 when you remove it. |
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Difference between Alias Record and CNAME?
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CNAME is to redirect the one domain to other
Alias Record could redirect to other AWS resource |
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Multivalue Answer
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Multivalue answer routing policy. Use when you want Route53 respond to DNS queries with up to eight healthy records selected randomly.
Route 53 do Health checks internaly. |
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Cross-Zone load balancing
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With Cross-Zone If you have 10 instance in two AZ in the first 2 and the second 8, each instance have 5% of traffic. First AZ receive 20% of traffic and second AZ receive 80% of traffic.
Without Cross-Zone the first AZ recive 50% traffic and the second the other 50% trafic. Each instance in first AZ receive 25% of traffic and in the second AZ each instance receive 6.25% of traffic. |
