81624a4cbc5b718299cf770b2c17d2e7bc8422ad
wiki/info/landscape/amazon-ec2.md
| ... | ... | @@ -37,7 +37,7 @@ To improve availability and reliability, we have a disposable environment type a |
| 37 | 37 | |
| 38 | 38 | The IPs for all reverse proxies will automatically be added to ALB target groups with the tag key `allReverseProxies`, including the `CentralWebServerHTTP-Dyn` target group (in the dynamic ALB in eu-west-1) |
| 39 | 39 | and all the `DDNSMapped-x-HTTP` (in all the DDNSMapped servers). These are the target groups for the default rules and it ensures availability to the ARCHIVE especially. |
| 40 | -Disposables instances are tagged with `disposableProxy` to indicate it hosts no vital services. `ReverseProxy` also identifies any reverse proxies. The health check for the target groups would change to trigger a script which returns different error codes: healthy/200 if in the same AZ as the archive (or if the failover archive is in use), whilst unhealthy/503 if in different AZs. This will reduce cross-AZ, archive traffic costs, but maintain availability and load balancing. |
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| 40 | +Disposables instances are tagged with `DisposableProxy` to indicate it hosts no vital services. `ReverseProxy` also identifies any reverse proxies. The health check for the target groups would change to trigger a script which returns different error codes: healthy/200 if in the same AZ as the archive (or if the failover archive is in use), whilst unhealthy/503 if in different AZs. This will reduce cross-AZ, archive traffic costs, but maintain availability and load balancing. |
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| 41 | 41 | |
| 42 | 42 | For security groups of the central reverse proxy, we want Webserver, as well as Disposable Reverse Proxy. The disposables just have the latter. |
| 43 | 43 |