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SIGUSR2 triggers graceful binary upgrades (spawns new process) (#1814)

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* SIGUSR2 triggers graceful binary upgrades (spawns new process)

* Move some functions around, hopefully fixing Windows build

* Clean up a couple file closes and add links to useful debugging thread

* Use two underscores in upgrade env var

To help ensure uniqueness / avoid possible collisions
This commit is contained in:
Matt Holt 2017-08-12 11:04:32 -06:00 • committed by GitHub
parent d2fa8600fc
commit 5e0896305c
4 changed files with 279 additions and 44 deletions
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11
caddyhttp/httpserver/https.go
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@ -44,9 +44,14 @@ func activateHTTPS(cctx caddy.Context) error {
// renew all relevant certificates that need renewal. this is important
// to do right away so we guarantee that renewals aren't missed, and
// also the user can respond to any potential errors that occur.
err = caddytls.RenewManagedCertificates(true)
if err != nil {
return err
// (skip if upgrading, because the parent process is likely already listening
// on the ports we'd need to do ACME before we finish starting; parent process
// already running renewal ticker, so renewal won't be missed anyway.)
if !caddy.IsUpgrade() {
err = caddytls.RenewManagedCertificates(true)
if err != nil {
return err
}
}
if !caddy.Quiet && operatorPresent {