使用共享ALB与Elastic Beanstalk时Host Headers自定义配置不生效问题

问题原因 #

当前配置未将自定义的myrule监听器规则关联到443端口监听器，同时没有禁用Elastic Beanstalk默认自动生成的region.elasticbeanstalk.com Host Header规则，导致自定义配置不生效。

解决步骤 #

1. 修改443监听器的规则列表配置，将自定义规则加入生效列表
2. 为自定义规则设置优先级，保证其匹配优先级高于默认规则
3. 添加配置禁用EB自动生成的默认Host Header规则

修改后完整配置参考 #

{
  namespace = "aws:elasticbeanstalk:environment"
  name      = "LoadBalancerIsShared"
  value     = "true"
},
{
  namespace = "aws:elasticbeanstalk:environment"
  name      = "DisableSharedALBDefaultHostHeaderRule"
  value     = "true"
},
{
  namespace = "aws:elbv2:listener:443"
  name      = "Rules"
  value     = "default,myrule"
},
{
  namespace = "aws:elbv2:loadbalancer"
  name      = "SharedLoadBalancer"
  value     = data.aws_lb.default.arn
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "DeregistrationDelay"
  value     = "20"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "HealthCheckInterval"
  value     = "15"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "HealthCheckTimeout"
  value     = "5"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "HealthyThresholdCount"
  value     = "3"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "Port"
  value     = "80"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "Protocol"
  value     = "HTTP"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "StickinessEnabled"
  value     = "false"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "StickinessLBCookieDuration"
  value     = "86400"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "StickinessType"
  value     = "lb_cookie"
},
{
  namespace = "aws:elasticbeanstalk:environment:process:default"
  name      = "UnhealthyThresholdCount"
  value     = "5"
},
{
  namespace = "aws:elbv2:listenerrule:myrule"
  name      = "HostHeaders"
  value     = "my.example.com"
},
{
  namespace = "aws:elbv2:listenerrule:myrule"
  name      = "Process"
  value     = "default"
},
{
  namespace = "aws:elbv2:listenerrule:myrule"
  name      = "Priority"
  value     = "100"
}

修改配置后重新执行Terraform apply，再更新Elastic Beanstalk环境即可生效。

内容的提问来源于stack exchange，提问作者Oli at cdcloudlogix.com