* Re: [ANN] unicorn 0.990.0 - inching towards 1.0
2010-06-11 1:27 7% ` Eric Wong
@ 2010-06-11 18:00 0% ` Alexander Simonov
0 siblings, 0 replies; 2+ results
From: Alexander Simonov @ 2010-06-11 18:00 UTC (permalink / raw)
To: unicorn list
On Jun 11, 2010, at 4:27 AM, Eric Wong wrote:
> Alexander Simonov <alex@simonov.me> wrote:
>> On Jun 10, 2010, at 10:38 AM, Eric Wong wrote:
>>> And again (I seem to remember saying this months ago), any time you're
>>> deploying, you should be paying extra attention to the app anyways.
>>> That means testing with actual HTTP requests, not just seeing of the
>>> process is up. Just having a running process serving error pages is
>>> equally worthless as not running the server at all.
>>
>> Hm.. It's makes sense.
>> But much better if it will be writing in the documentation for the future.
>
> Here's what I've pushed out, let me know if everything makes
> sense. I think I'll release 0.991.0 in a little bit.
Ok! Thank you!
Good. After release I will update golden_brindle too :)
>
>> From f9baab18705218dae4c37c2c92d1ceea151bba8e Mon Sep 17 00:00:00 2001
> From: Eric Wong <normalperson@yhbt.net>
> Date: Thu, 10 Jun 2010 17:57:08 -0700
> Subject: [PATCH] docs: hopefully clarify preload_app=false behavior
>
> While we're at it, inform people of why they might use
> a symlink
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^ permalink raw reply [relevance 0%]
* Re: [ANN] unicorn 0.990.0 - inching towards 1.0
@ 2010-06-11 1:27 7% ` Eric Wong
2010-06-11 18:00 0% ` Alexander Simonov
0 siblings, 1 reply; 2+ results
From: Eric Wong @ 2010-06-11 1:27 UTC (permalink / raw)
To: unicorn list
Alexander Simonov <alex@simonov.me> wrote:
> On Jun 10, 2010, at 10:38 AM, Eric Wong wrote:
> > And again (I seem to remember saying this months ago), any time you're
> > deploying, you should be paying extra attention to the app anyways.
> > That means testing with actual HTTP requests, not just seeing of the
> > process is up. Just having a running process serving error pages is
> > equally worthless as not running the server at all.
>
> Hm.. It's makes sense.
> But much better if it will be writing in the documentation for the future.
Here's what I've pushed out, let me know if everything makes
sense. I think I'll release 0.991.0 in a little bit.
>From f9baab18705218dae4c37c2c92d1ceea151bba8e Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Thu, 10 Jun 2010 17:57:08 -0700
Subject: [PATCH] docs: hopefully clarify preload_app=false behavior
While we're at it, inform people of why they might use
a symlink
---
SIGNALS | 7 ++++++-
lib/unicorn/configurator.rb | 21 ++++++++++++++++++---
2 files changed, 24 insertions(+), 4 deletions(-)
diff --git a/SIGNALS b/SIGNALS
index be96892..8851775 100644
--- a/SIGNALS
+++ b/SIGNALS
@@ -14,7 +14,12 @@ Unicorn and nginx.
will also pick up any application code changes when restarted. If
"preload_app" is true, then application code changes will have no
effect; USR2 + QUIT (see below) must be used to load newer code in
- this case.
+ this case. When reloading the application, +Gem.refresh+ will
+ be called so updated code for your application can pick up newly
+ installed RubyGems. It is not recommended that you uninstall
+ libraries your application depends on while Unicorn is running,
+ as respawned workers may enter a spawn loop when they fail to
+ load an uninstalled dependency.
* INT/TERM - quick shutdown, kills all workers immediately
diff --git a/lib/unicorn/configurator.rb b/lib/unicorn/configurator.rb
index 71c7a8a..533e0ed 100644
--- a/lib/unicorn/configurator.rb
+++ b/lib/unicorn/configurator.rb
@@ -311,7 +311,22 @@ module Unicorn
#
# In addition to reloading the unicorn-specific config settings,
# SIGHUP will reload application code in the working
- # directory/symlink when workers are gracefully restarted.
+ # directory/symlink when workers are gracefully restarted when
+ # preload_app=false (the default). As reloading the application
+ # sometimes requires RubyGems updates, +Gem.refresh+ is always
+ # called before the application is loaded (for RubyGems users).
+ #
+ # During deployments, care should _always_ be taken to ensure your
+ # applications are properly deployed and running. Using
+ # preload_app=false (the default) means you _must_ check if
+ # your application is responding properly after a deployment.
+ # Improperly deployed applications can go into a spawn loop
+ # if the application fails to load. While your children are
+ # in a spawn loop, it is is possible to fix an application
+ # by properly deploying all required code and dependencies.
+ # Using preload_app=true means any application load error will
+ # cause the master process to exit with an error.
+
def preload_app(bool)
case bool
when TrueClass, FalseClass
@@ -344,9 +359,9 @@ module Unicorn
set_path(:stdout_path, path)
end
- # sets the working directory for Unicorn. This ensures USR2 will
+ # sets the working directory for Unicorn. This ensures SIGUSR2 will
# start a new instance of Unicorn in this directory. This may be
- # a symlink.
+ # a symlink, a common scenario for Capistrano users.
def working_directory(path)
# just let chdir raise errors
path = File.expand_path(path)
--
Eric Wong
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2010-06-08 9:51 [ANN] unicorn 0.990.0 - inching towards 1.0 Eric Wong
2010-06-09 8:39 ` Alexander Simonov
2010-06-09 18:22 ` Eric Wong
2010-06-10 5:26 ` Alexander Simonov
2010-06-10 7:38 ` Eric Wong
2010-06-10 8:46 ` Alexander Simonov
2010-06-11 1:27 7% ` Eric Wong
2010-06-11 18:00 0% ` Alexander Simonov
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