[PATCH] doc: emphasize the importance of stderr_path

Eric Wong normalperson at yhbt.net
Fri Jun 4 16:47:36 EDT 2010


Eric Wong <normalperson at yhbt.net> wrote:
> I shall emphasize the importance of stderr_path if you're using the
> default logger configuration in the documentation.

I've just pushed the following out to unicorn.git and website.

Comments/grammar/speling korections welcome as always.

>From 2d5a4b075801493a85c6e8d2dbdf0c95002e046d Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson at yhbt.net>
Date: Fri, 4 Jun 2010 13:42:34 -0700
Subject: [PATCH] doc: emphasize the importance of stderr_path

While second nature to myself, stderr_path may be an
overlooked configuration parameter for some users.  Also,
add a minimal sample configuration file that is shorter
and hopefully less intimidating to new users.
---
 examples/unicorn.conf.minimal.rb |   13 +++++++++++++
 examples/unicorn.conf.rb         |   12 +++++++++---
 lib/unicorn/configurator.rb      |   22 ++++++++++++++++++----
 3 files changed, 40 insertions(+), 7 deletions(-)
 create mode 100644 examples/unicorn.conf.minimal.rb

diff --git a/examples/unicorn.conf.minimal.rb b/examples/unicorn.conf.minimal.rb
new file mode 100644
index 0000000..2a47910
--- /dev/null
+++ b/examples/unicorn.conf.minimal.rb
@@ -0,0 +1,13 @@
+# Minimal sample configuration file for Unicorn (not Rack) when used
+# with daemonization (unicorn -D) started in your working directory.
+#
+# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
+# documentation.
+# See also http://unicorn.bogomips.org/examples/unicorn.conf.rb for
+# a more verbose configuration using more features.
+
+listen 2007 # by default Unicorn listens on port 8080
+worker_processes 2 # this should be >= nr_cpus
+pid "/path/to/app/shared/pids/unicorn.pid"
+stderr_path "/path/to/app/shared/log/unicorn.log"
+stdout_path "/path/to/app/shared/log/unicorn.log"
diff --git a/examples/unicorn.conf.rb b/examples/unicorn.conf.rb
index e209894..37c3e81 100644
--- a/examples/unicorn.conf.rb
+++ b/examples/unicorn.conf.rb
@@ -1,4 +1,9 @@
-# Sample configuration file for Unicorn (not Rack)
+# Sample verbose configuration file for Unicorn (not Rack)
+#
+# This configuration file documents many features of Unicorn
+# that may not be needed for some applications. See
+# http://unicorn.bogomips.org/examples/unicorn.conf.minimal.rb
+# for a much simpler configuration file.
 #
 # See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
 # documentation.
@@ -22,8 +27,9 @@ timeout 30
 # feel free to point this anywhere accessible on the filesystem
 pid "/path/to/app/shared/pids/unicorn.pid"
 
-# some applications/frameworks log to stderr or stdout, so prevent
-# them from going to /dev/null when daemonized here:
+# By default, the Unicorn logger will write to stderr.
+# Additionally, ome applications/frameworks log to stderr or stdout,
+# so prevent them from going to /dev/null when daemonized here:
 stderr_path "/path/to/app/shared/log/unicorn.stderr.log"
 stdout_path "/path/to/app/shared/log/unicorn.stdout.log"
 
diff --git a/lib/unicorn/configurator.rb b/lib/unicorn/configurator.rb
index 64a25e3..4fa745d 100644
--- a/lib/unicorn/configurator.rb
+++ b/lib/unicorn/configurator.rb
@@ -7,9 +7,11 @@ module Unicorn
 
   # Implements a simple DSL for configuring a Unicorn server.
   #
-  # See http://unicorn.bogomips.org/examples/unicorn.conf.rb for an
-  # example config file.  An example config file for use with nginx is
-  # also available at http://unicorn.bogomips.org/examples/nginx.conf
+  # See http://unicorn.bogomips.org/examples/unicorn.conf.rb and
+  # http://unicorn.bogomips.org/examples/unicorn.conf.minimal.rb
+  # example configuration files.  An example config file for use with
+  # nginx is also available at
+  # http://unicorn.bogomips.org/examples/nginx.conf
   class Configurator < Struct.new(:set, :config_file, :after_reload)
 
     # Default settings for Unicorn
@@ -78,6 +80,10 @@ module Unicorn
     # sets object to the +new+ Logger-like object.  The new logger-like
     # object must respond to the following methods:
     #  +debug+, +info+, +warn+, +error+, +fatal+, +close+
+    # The default Logger will log its output to the path specified
+    # by +stderr_path+.  If you're running Unicorn daemonized, then
+    # you must specify a path to prevent error messages from going
+    # to /dev/null.
     def logger(new)
       %w(debug info warn error fatal close).each do |m|
         new.respond_to?(m) and next
@@ -310,11 +316,19 @@ module Unicorn
     # file will be opened with the File::APPEND flag and writes
     # synchronized to the kernel (but not necessarily to _disk_) so
     # multiple processes can safely append to it.
+    #
+    # If you are daemonizing and using the default +logger+, it is important
+    # to specify this as errors will otherwise be lost to /dev/null.
+    # Some applications/libraries may also triggering warnings that go to
+    # stderr, and they will end up here.
     def stderr_path(path)
       set_path(:stderr_path, path)
     end
 
-    # Same as stderr_path, except for $stdout
+    # Same as stderr_path, except for $stdout.  Not many Rack applications
+    # write to $stdout, but any that do will have their output written here.
+    # It is safe to point this to the same location a stderr_path.
+    # Like stderr_path, this defaults to /dev/null when daemonized.
     def stdout_path(path)
       set_path(:stdout_path, path)
     end
-- 
Eric Wong


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