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📚 Wiki-Go
1 Mnemonica
2 Gcf
3 Infra
4 Personal
5 Snippets
Courtesy/Maintenance Page — eks-prod ALB
FDW Instance Setup - Operational Guide
EKS Cost Analysis Report - prod
EKS Optimization Recommendations - prod
EKS Cluster Discovery Report - prod
Board Identification Reference
Kopia S3 Backup - Quick Start Guide
Accesso
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Certificate Renewal Configuration Deployment
Certificate Renewal Script Improvements
Apache2 PostfixAdmin Security Configuration
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Glossario Acronimi - WP3.1
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Home › 5 Snippets › Courtesy/Maintenance Page — eks-prod ALB

Courtesy/Maintenance Page — eks-prod ALB

Purpose

During upgrades, show a maintenance page to all mnemonica.io visitors while allowing internal bypass via a secret header.

ALB Details

Enable Maintenance Mode

Rule #98 — Bypass (secret header grants access) 

aws elbv2 create-rule \
  --listener-arn "arn:aws:elasticloadbalancing:eu-west-1:828879644785:listener/app/eks-prod/cb27f6f4b6d18fb2/0c4338c0c9905001" \
  --priority 98 \
  --conditions '[{"Field":"host-header","HostHeaderConfig":{"Values":["mnemonica.io"]}},{"Field":"http-header","HttpHeaderConfig":{"HttpHeaderName":"mne-release","Values":["93705e70-f421-4284-9bd2-73411f27ae1b"]}}]' \
  --actions '[{"Type":"forward","TargetGroupArn":"arn:aws:elasticloadbalancing:eu-west-1:828879644785:targetgroup/eks-prod-frontend/a24c60bab6eeecc7"}]' \
  --region eu-west-1

Rule #99 — Maintenance page (catch-all for mnemonica.io) 

aws elbv2 create-rule \
  --listener-arn "arn:aws:elasticloadbalancing:eu-west-1:828879644785:listener/app/eks-prod/cb27f6f4b6d18fb2/0c4338c0c9905001" \
  --priority 99 \
  --conditions '[{"Field":"host-header","HostHeaderConfig":{"Values":["mnemonica.io"]}}]' \
  --actions '[{"Type":"fixed-response","FixedResponseConfig":{"StatusCode":"200","ContentType":"text/html","MessageBody":"<!doctype html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"utf-8\">\n\n    <title>Mnemonica</title>\n    <meta name=\"description\" content=\"we'\''re upgrading!\">\n    <meta name=\"author\" content=\"mnemonica\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n\n    <link rel=\"preconnect\" href=\"https://fonts.gstatic.com\">\n    <link href=\"https://fonts.googleapis.com/css2?family=Mulish:wght@300;600&display=swap\" rel=\"stylesheet\">\n    <link rel=\"stylesheet\" href=\"https://mnemonica.com/wp-content/uploads/2021/09/courtesy-style.css\">\n\n</head>\n<body>\n<section>\n    <picture>\n        <img src=\"https://mnemonica.com/wp-content/uploads/2025/09/mn-logo-25-landscape-brand-lighter.png\">\n    </picture>\n    <div>\n        <p>Sorry for the inconvenience but we&rsquo;re performing an upgrade at the moment.<br>We&rsquo;ll be back shortly!</p>\n    </div>\n</section>\n\n</body>\n</html>"}}]' \
  --region eu-west-1

Disable Maintenance Mode

List rules to find ARNs for priorities 98 and 99, then delete them:

# Find rule ARNs
aws elbv2 describe-rules \
  --listener-arn "arn:aws:elasticloadbalancing:eu-west-1:828879644785:listener/app/eks-prod/cb27f6f4b6d18fb2/0c4338c0c9905001" \
  --query "Rules[?Priority=='98' || Priority=='99'].[RuleArn,Priority]" \
  --output table \
  --region eu-west-1

# Delete them (replace ARNs)
aws elbv2 delete-rule --rule-arn <RULE_98_ARN> --region eu-west-1
aws elbv2 delete-rule --rule-arn <RULE_99_ARN> --region eu-west-1

Bypass Usage

Use a browser extension like ModHeader to set:

How It Works

Rules are evaluated in priority order. With maintenance mode ON:

  1. Priority 98: mnemonica.io + secret header → forwards to app (bypass)
  2. Priority 99: mnemonica.io → returns maintenance HTML (blocks everyone else)
  3. Priority 100: never reached for mnemonica.io traffic (existing CloudFront rule)

When rules 98+99 are removed, priority 100 resumes normal service.

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