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Caddy restarts gracefully with zero downtime. If you're killing the process and starting one anew, you're doing it wrong. Use signal USR1 to gracefully apply ne

by mholt 9y ago

Caddy restarts gracefully with zero downtime. If you're killing the process and starting one anew, you're doing it wrong. Use signal USR1 to gracefully apply new configuration changes. Failed reloads fall back to the current working configuration without any changes or downtime. https://caddyserver.com/docs/cli#usr1 https://caddyserver.com/docs/cli#usr1

ptman 9y ago
What if there's a reason to restart the server or spawn a new one?
- imhoguy 9y ago
  Scaling, upgrading, disk issues, just migrating to new place... and foremost https://en.m.wikipedia.org/wiki/Fallacies_of_distributed_computing https://en.m.wikipedia.org/wiki/Fallacies_of_distributed_com... Also nowadays with Docker around I rarely see server/app bundles supporting graceful reload.
atonse 9y ago
This misses the overall point. If I am hosting 5 sites on caddy, and add a 6th one, I restart the server. If the 6th site doesn't work (for example, if DNS didn't resolve for lets encrypt), the other 5 sites which were working before the restart, all fail to start as caddy completely crashes. This is basic resiliency you'd expect from your web server. Why should the other 5 sites fail to start if their configs are completely valid?
- majewsky 9y ago
  > If I am hosting 5 sites on caddy, and add a 6th one, I restart the server. No, you don't. You reload the server, not restart it. Restarting a web server should only be required if you get an upgrade for it (or for OpenSSL etc.)
  - e_d_e_v 9y ago
    This goes wholly against most cattle-not-pets devops philosophy though, right?
    - eropple 9y ago
      How so? In Chef: notifies :reload, "service[caddy]", :delayed
      - e_d_e_v 9y ago
        The idea here is that the server can't be scaled up or down. I suggest googling "cattle vs pets". If you know how to make a single process scale horizontally across additional hosts or scale up in alternative datacenters with a chef service notification, I'd pay you money to tell me how.
        eropple 9y ago
        So, um: devops and cloud architecture is my job. I think I know what "cattle vs pets" is referring to. Nothing in this thread has anything to do with one versus many processes or one versus many nodes, nor does it have anything to do with manual configuration of anything. Rewrite the configuration based in orchestration data or, in extremity, upload a new version of a cookbook that handles that new site; the hypothetical sixth site is added and the service kicked over without human interaction. Scaling is an orthogonal concern.
  - sleepychu 9y ago
    OK, there's a 0-day patch for OpenSSL, without it my users are vulnerable to RCE. Why can't I restart if LE's ACME is down?

by mholt 9y ago

ptman 9y ago

What if there's a reason to restart the server or spawn a new one?

imhoguy 9y ago
Scaling, upgrading, disk issues, just migrating to new place... and foremost https://en.m.wikipedia.org/wiki/Fallacies_of_distributed_computing https://en.m.wikipedia.org/wiki/Fallacies_of_distributed_com... Also nowadays with Docker around I rarely see server/app bundles supporting graceful reload.

atonse 9y ago

This misses the overall point. If I am hosting 5 sites on caddy, and add a 6th one, I restart the server. If the 6th site doesn't work (for example, if DNS didn't resolve for lets encrypt), the other 5 sites which were working before the restart, all fail to start as caddy completely crashes. This is basic resiliency you'd expect from your web server. Why should the other 5 sites fail to start if their configs are completely valid?

majewsky 9y ago
> If I am hosting 5 sites on caddy, and add a 6th one, I restart the server. No, you don't. You reload the server, not restart it. Restarting a web server should only be required if you get an upgrade for it (or for OpenSSL etc.)
- e_d_e_v 9y ago
  This goes wholly against most cattle-not-pets devops philosophy though, right?
  - eropple 9y ago
    How so? In Chef: notifies :reload, "service[caddy]", :delayed
    - e_d_e_v 9y ago
      The idea here is that the server can't be scaled up or down. I suggest googling "cattle vs pets". If you know how to make a single process scale horizontally across additional hosts or scale up in alternative datacenters with a chef service notification, I'd pay you money to tell me how.
      - eropple 9y ago
        So, um: devops and cloud architecture is my job. I think I know what "cattle vs pets" is referring to. Nothing in this thread has anything to do with one versus many processes or one versus many nodes, nor does it have anything to do with manual configuration of anything. Rewrite the configuration based in orchestration data or, in extremity, upload a new version of a cookbook that handles that new site; the hypothetical sixth site is added and the service kicked over without human interaction. Scaling is an orthogonal concern.
- sleepychu 9y ago
  OK, there's a 0-day patch for OpenSSL, without it my users are vulnerable to RCE. Why can't I restart if LE's ACME is down?