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fix(caddy): default catch-all returns 503 instead of welcome page #256

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fix(caddy): default catch-all returns 503 instead of welcome page #256

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16 changes: 13 additions & 3 deletions pkg/clouds/pulumi/kubernetes/caddy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -90,11 +90,21 @@ func DeployCaddyService(ctx *sdk.Context, caddy CaddyDeployment, input api.Resou
}

defaultCaddyFileEntryStart := `http:// {`
// Default catch-all serves a hard 503 instead of a static "welcome" page.
// Rationale: when all Services with a `simple-container.com/caddyfile-entry`
// annotation for a given Host vanish (e.g. a cascade-deletion from a
// namespace Replace gone wrong), the request used to fall through to a
// `file_server /etc/caddy/pages` block and respond with HTTP 200 + "Default
// page". External monitoring saw healthy 200s while every backend was gone.
// 503 + Retry-After makes the absence of routes loud: CDNs fail over,
// uptime checks alert, oncall sees it.
defaultCaddyFileEntry := `
import gzip
import handle_static
root * /etc/caddy/pages
file_server
header Cache-Control "no-store"
header Retry-After "60"
respond "<!doctype html><meta charset=utf-8><title>503 Service Unavailable</title><style>body{font:20px Helvetica,sans-serif;color:#333;text-align:center;padding:120px}h1{font-size:48px}code{background:#eee;padding:2px 6px;border-radius:3px}</style><h1>503 Service Unavailable</h1><p>No backend route is configured for this host.</p><p>If you are an operator, verify the Service has the <code>simple-container.com/caddyfile-entry</code> annotation and that Caddy has been rolled.</p>" 503 {
close
}
`
// if caddy must respect SSL connections only
useSSL := caddy.UseSSL == nil || *caddy.UseSSL
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