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Jason Su

2011-May-19 05:56 UTC

unicorn doesn''t restart properly after cap deploy (not using Bundler)

Hey guys,

I''m sending USR2 to unicorn after cap deploy, and the old master is
getting replaced by a new master that doesn''t work.

Here are some similar threads I found ...
http://rubyforge.org/pipermail/mongrel-unicorn/2010-October/000733.html
http://rubyforge.org/pipermail/mongrel-unicorn/2010-October/000717.html

I''m not using Bundler, and I have working_directory set in my unicorn
config:

Unicorn::HttpServer::START_CTX[0]
"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails"
pid "/var/www/lookbook/shared/pids/unicorn.pid"
stderr_path "/var/www/lookbook/shared/log/unicorn.stderr.log"
stdout_path "/var/www/lookbook/shared/log/unicorn.stdout.log"
preload_app true
if GC.respond_to?(:copy_on_write_friendly=)
? GC.copy_on_write_friendly = true
end
before_fork do |server, worker|
? STDERR.puts "BEFORE FORK:"
? STDERR.puts ENV.inspect
? defined?(ActiveRecord::Base) and
? ? ActiveRecord::Base.connection.disconnect!
? if old_pid != server.pid
? ? begin
? ? ? sig = (worker.nr?+ 1) >= server.worker_processes ? :QUIT : :TTOU
? ? ? Process.kill(sig, File.read(old_pid).to_i)
? ? rescue Errno::ENOENT, Errno::ESRCH
? ? end
? end

end
after_fork do |server, worker|
? STDERR.puts "AFTER FORK:"
? STDERR.puts ENV.inspect

? defined?(ActiveRecord::Base) and
? ? ActiveRecord::Base.establish_connection
? begin
? ? uid, gid = Process.euid, Process.egid
? ? user, group = ''apache'', ''apache''
? ? target_uid = Etc.getpwnam(user).uid
? ? target_gid = Etc.getgrnam(group).gid
? ? worker.tmp.chown(target_uid, target_gid)
? ? if uid != target_uid || gid != target_gid
? ? ? Process.initgroups(user, target_gid)
? ? ? Process::GID.change_privilege(target_gid)
? ? ? Process::UID.change_privilege(target_uid)
? ? end
? rescue => e
? ? if RAILS_ENV == ''development''
? ? ? STDERR.puts "couldn''t change user, oh well"
? ? else
? ? ? raise e
? ? end
? end
end
before_exec do |server|
? STDERR.puts "BEFORE EXEC:"
? ENV["PATH"]
"/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local:/opt/ruby-enterprise-1.8.7-2010.02/bin"
? STDERR.puts ENV.inspect
end



Below is the output from unicorn.stderr.log.. I''m not sure if
UNICORN_FD has something to do with it?
1) starting unicorn
BEFORE FORK:
{"SHELL"=>"/bin/bash",
"TERM"=>"xterm",
"SSH_CLIENT"=>"24.23.182.32
38170 22", "OLDPWD"=>"/root",
"SSH_TTY"=>"/dev/pts/5",
"USER"=>"root",
"SSH_AUTH_SOCK"=>"/tmp/ssh-eeoDcvH461/agent.461",
"PATH"=>"/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin",
"MAIL"=>"/var/mail/root",
"PWD"=>"/var/www/lookbook/current",
"HOME"=>"/root", "SHLVL"=>"2",
"LOGNAME"=>"root",
"SSH_CONNECTION"=>"24.23.182.32 38170 98.158.22.100 22",
"_"=>"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails",
"RAILS_ENV"=>"production"}
AFTER FORK:
{"SHELL"=>"/bin/bash",
"TERM"=>"xterm",
"SSH_CLIENT"=>"24.23.182.32
38170 22", "OLDPWD"=>"/root",
"SSH_TTY"=>"/dev/pts/5",
"USER"=>"root",
"SSH_AUTH_SOCK"=>"/tmp/ssh-eeoDcvH461/agent.461",
"PATH"=>"/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin",
"MAIL"=>"/var/mail/root",
"PWD"=>"/var/www/lookbook/current",
"HOME"=>"/root", "SHLVL"=>"2",
"LOGNAME"=>"root",
"SSH_CONNECTION"=>"24.23.182.32 38170 98.158.22.100 22",
"_"=>"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails",
"RAILS_ENV"=>"production"}


2) restarting unicorn (kill -USR2)

BEFORE EXEC:
{"SHELL"=>"/bin/bash",
"TERM"=>"xterm",
"SSH_CLIENT"=>"24.23.182.32
38170 22", "OLDPWD"=>"/root",
"SSH_TTY"=>"/dev/pts/5",
"USER"=>"root",
"SSH_AUTH_SOCK"=>"/tmp/ssh-eeoDcvH461/agent.461",
"PATH"=>"/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local:/opt/ruby-enterprise-1.8.7-2010.02/bin",
"MAIL"=>"/var/mail/root",
"PWD"=>"/var/www/lookbook/current",
"HOME"=>"/root", "SHLVL"=>"2",
"LOGNAME"=>"root",
"SSH_CONNECTION"=>"24.23.182.32 38170 98.158.22.100 22",
"_"=>"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails",
"RAILS_ENV"=>"production",
"UNICORN_FD"=>"3"}
I, [2011-05-18T18:13:56.318531 #510] ?INFO -- : inherited
addr=/var/www/lookbook/current/tmp/sockets/unicorn.sock fd=3
I, [2011-05-18T18:13:56.318819 #510] ?INFO -- : Refreshing Gem list
BEFORE FORK:
{"SHELL"=>"/bin/bash",
"TERM"=>"xterm",
"SSH_CLIENT"=>"24.23.182.32
38170 22", "OLDPWD"=>"/root",
"SSH_TTY"=>"/dev/pts/5",
"USER"=>"root",
"SSH_AUTH_SOCK"=>"/tmp/ssh-eeoDcvH461/agent.461",
"PATH"=>"/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local:/opt/ruby-enterprise-1.8.7-2010.02/bin",
"MAIL"=>"/var/mail/root",
"PWD"=>"/var/www/lookbook/current",
"HOME"=>"/root", "SHLVL"=>"2",
"LOGNAME"=>"root",
"SSH_CONNECTION"=>"24.23.182.32 38170 98.158.22.100 22",
"_"=>"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails",
"RAILS_ENV"=>"production",
"UNICORN_FD"=>"3"}
AFTER FORK:
{"SHELL"=>"/bin/bash",
"TERM"=>"xterm",
"SSH_CLIENT"=>"24.23.182.32
38170 22", "OLDPWD"=>"/root",
"SSH_TTY"=>"/dev/pts/5",
"USER"=>"root",
"SSH_AUTH_SOCK"=>"/tmp/ssh-eeoDcvH461/agent.461",
"PATH"=>"/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local:/opt/ruby-enterprise-1.8.7-2010.02/bin",
"MAIL"=>"/var/mail/root",
"PWD"=>"/var/www/lookbook/current",
"HOME"=>"/root", "SHLVL"=>"2",
"LOGNAME"=>"root",
"SSH_CONNECTION"=>"24.23.182.32 38170 98.158.22.100 22",
"_"=>"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails",
"RAILS_ENV"=>"production",
"UNICORN_FD"=>"3"}

3) cap deploy with symlinks + restart unicorn (kill -USR2)

BEFORE EXEC:
{"SHELL"=>"/bin/bash",
"TERM"=>"xterm",
"SSH_CLIENT"=>"24.23.182.32
38170 22", "OLDPWD"=>"/root",
"SSH_TTY"=>"/dev/pts/5",
"USER"=>"root",
"SSH_AUTH_SOCK"=>"/tmp/ssh-eeoDcvH461/agent.461",
"PATH"=>"/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local:/opt/ruby-enterprise-1.8.7-2010.02/bin",
"MAIL"=>"/var/mail/root",
"PWD"=>"/var/www/lookbook/current",
"HOME"=>"/root", "SHLVL"=>"2",
"LOGNAME"=>"root",
"SSH_CONNECTION"=>"24.23.182.32 38170 98.158.22.100 22",
"_"=>"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails",
"RAILS_ENV"=>"production",
"UNICORN_FD"=>"3"}
I, [2011-05-18T18:17:13.732600 #1589] ?INFO -- : inherited
addr=/var/www/lookbook/current/tmp/sockets/unicorn.sock fd=3
I, [2011-05-18T18:17:13.732942 #1589] ?INFO -- : Refreshing Gem list
BEFORE FORK:
{"SHELL"=>"/bin/bash",
"TERM"=>"xterm",
"SSH_CLIENT"=>"24.23.182.32
38170 22", "OLDPWD"=>"/root",
"SSH_TTY"=>"/dev/pts/5",
"USER"=>"root",
"SSH_AUTH_SOCK"=>"/tmp/ssh-eeoDcvH461/agent.461",
"PATH"=>"/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local:/opt/ruby-enterprise-1.8.7-2010.02/bin",
"MAIL"=>"/var/mail/root",
"PWD"=>"/var/www/lookbook/current",
"HOME"=>"/root", "SHLVL"=>"2",
"LOGNAME"=>"root",
"SSH_CONNECTION"=>"24.23.182.32 38170 98.158.22.100 22",
"_"=>"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails",
"RAILS_ENV"=>"production",
"UNICORN_FD"=>"3"}
AFTER FORK:
{"SHELL"=>"/bin/bash",
"TERM"=>"xterm",
"SSH_CLIENT"=>"24.23.182.32
38170 22", "OLDPWD"=>"/root",
"SSH_TTY"=>"/dev/pts/5",
"USER"=>"root",
"SSH_AUTH_SOCK"=>"/tmp/ssh-eeoDcvH461/agent.461",
"PATH"=>"/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local:/opt/ruby-enterprise-1.8.7-2010.02/bin",
"MAIL"=>"/var/mail/root",
"PWD"=>"/var/www/lookbook/current",
"HOME"=>"/root", "SHLVL"=>"2",
"LOGNAME"=>"root",
"SSH_CONNECTION"=>"24.23.182.32 38170 98.158.22.100 22",
"_"=>"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails",
"RAILS_ENV"=>"production",
"UNICORN_FD"=>"3"}
worker=1 ready


any help appreciated, thanks :D
Jason

Eric Wong

2011-May-19 09:27 UTC

head link

unicorn doesn''t restart properly after cap deploy (not using Bundler)

Jason Su <jason at lookbook.nu> wrote:> Hey guys,
> 
> I''m sending USR2 to unicorn after cap deploy, and the old master
is
> getting replaced by a new master that doesn''t work.
Can you expand on "doesn''t work"?
> Here are some similar threads I found ...
> http://rubyforge.org/pipermail/mongrel-unicorn/2010-October/000733.html
> http://rubyforge.org/pipermail/mongrel-unicorn/2010-October/000717.html
> 
> I''m not using Bundler, and I have working_directory set in my
unicorn config:
I don''t see where you have working_directory set below
> Unicorn::HttpServer::START_CTX[0] >
"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails"
You shouldn''t need to touch START_CTX unless you''re switching
Ruby
installations.  It''s rope to hang yourself with.

I would simplify the config file as much as possible if you''re
debugging a problem.
> pid "/var/www/lookbook/shared/pids/unicorn.pid"
> stderr_path "/var/www/lookbook/shared/log/unicorn.stderr.log"
> stdout_path "/var/www/lookbook/shared/log/unicorn.stdout.log"
> preload_app true
> if GC.respond_to?(:copy_on_write_friendly=)
> ? GC.copy_on_write_friendly = true
> end
> before_fork do |server, worker|
> ? STDERR.puts "BEFORE FORK:"
> ? STDERR.puts ENV.inspect
> ? defined?(ActiveRecord::Base) and
> ? ? ActiveRecord::Base.connection.disconnect!
The auto-killing old workers bit is fragile and you shouldn''t need
it unless you''re very low on memory.
> ? if old_pid != server.pid
> ? ? begin
> ? ? ? sig = (worker.nr?+ 1) >= server.worker_processes ? :QUIT : :TTOU
> ? ? ? Process.kill(sig, File.read(old_pid).to_i)
> ? ? rescue Errno::ENOENT, Errno::ESRCH
> ? ? end
> ? end
> 
> end
> after_fork do |server, worker|
> ? STDERR.puts "AFTER FORK:"
> ? STDERR.puts ENV.inspect
> 
> ? defined?(ActiveRecord::Base) and
> ? ? ActiveRecord::Base.establish_connection
> ? begin
If you want to use user switching, the "user" directive which
appeared a while back is much simpler and less error prone.
> ? ? uid, gid = Process.euid, Process.egid
> ? ? user, group = ''apache'', ''apache''
> ? ? target_uid = Etc.getpwnam(user).uid
> ? ? target_gid = Etc.getgrnam(group).gid
> ? ? worker.tmp.chown(target_uid, target_gid)
> ? ? if uid != target_uid || gid != target_gid
> ? ? ? Process.initgroups(user, target_gid)
> ? ? ? Process::GID.change_privilege(target_gid)
> ? ? ? Process::UID.change_privilege(target_uid)
> ? ? end
<snip>
> Below is the output from unicorn.stderr.log.. I''m not sure if
> UNICORN_FD has something to do with it?
UNICORN_FD is absolutely for the old master tells the new master about
the listener sockets to inherit.  Don''t touch it.

<snip>
> 3) cap deploy with symlinks + restart unicorn (kill -USR2)
<snip>
> addr=/var/www/lookbook/current/tmp/sockets/unicorn.sock fd=3
You should make sure your socket is in a shared path, not current.

Whatever''s in current gets replaced by Capistrano, right?  I''m
not sure
if tmp is a symlink that''s relinked on a new deploy, but there could be
a race condition where the path to the socket is unreachable and
nginx can''t see it.

-- 
Eric Wong

Jason Su

2011-May-19 20:26 UTC

head link

unicorn doesn''t restart properly after cap deploy (not using Bundler)

You were right, the socket was not in a shared path... D''oh!

Thanks so much~

On Thu, May 19, 2011 at 2:27 AM, Eric Wong <normalperson at yhbt.net>
wrote:> Jason Su <jason at lookbook.nu> wrote:
>> Hey guys,
>>
>> I''m sending USR2 to unicorn after cap deploy, and the old
master is
>> getting replaced by a new master that doesn''t work.
>
> Can you expand on "doesn''t work"?
>
>> Here are some similar threads I found ...
>> http://rubyforge.org/pipermail/mongrel-unicorn/2010-October/000733.html
>> http://rubyforge.org/pipermail/mongrel-unicorn/2010-October/000717.html
>>
>> I''m not using Bundler, and I have working_directory set in my
unicorn config:
>
> I don''t see where you have working_directory set below
>
>> Unicorn::HttpServer::START_CTX[0] >>
"/opt/ruby-enterprise-1.8.7-2010.02/bin/unicorn_rails"
>
> You shouldn''t need to touch START_CTX unless you''re
switching Ruby
> installations. ?It''s rope to hang yourself with.
>
> I would simplify the config file as much as possible if you''re
> debugging a problem.
>
>> pid "/var/www/lookbook/shared/pids/unicorn.pid"
>> stderr_path "/var/www/lookbook/shared/log/unicorn.stderr.log"
>> stdout_path "/var/www/lookbook/shared/log/unicorn.stdout.log"
>> preload_app true
>> if GC.respond_to?(:copy_on_write_friendly=)
>> ? GC.copy_on_write_friendly = true
>> end
>> before_fork do |server, worker|
>> ? STDERR.puts "BEFORE FORK:"
>> ? STDERR.puts ENV.inspect
>> ? defined?(ActiveRecord::Base) and
>> ? ? ActiveRecord::Base.connection.disconnect!
>
> The auto-killing old workers bit is fragile and you shouldn''t need
> it unless you''re very low on memory.
>
>> ? if old_pid != server.pid
>> ? ? begin
>> ? ? ? sig = (worker.nr?+ 1) >= server.worker_processes ? :QUIT :
:TTOU
>> ? ? ? Process.kill(sig, File.read(old_pid).to_i)
>> ? ? rescue Errno::ENOENT, Errno::ESRCH
>> ? ? end
>> ? end
>>
>> end
>> after_fork do |server, worker|
>> ? STDERR.puts "AFTER FORK:"
>> ? STDERR.puts ENV.inspect
>>
>> ? defined?(ActiveRecord::Base) and
>> ? ? ActiveRecord::Base.establish_connection
>> ? begin
>
> If you want to use user switching, the "user" directive which
> appeared a while back is much simpler and less error prone.
>
>> ? ? uid, gid = Process.euid, Process.egid
>> ? ? user, group = ''apache'',
''apache''
>> ? ? target_uid = Etc.getpwnam(user).uid
>> ? ? target_gid = Etc.getgrnam(group).gid
>> ? ? worker.tmp.chown(target_uid, target_gid)
>> ? ? if uid != target_uid || gid != target_gid
>> ? ? ? Process.initgroups(user, target_gid)
>> ? ? ? Process::GID.change_privilege(target_gid)
>> ? ? ? Process::UID.change_privilege(target_uid)
>> ? ? end
>
> <snip>
>
>> Below is the output from unicorn.stderr.log.. I''m not sure if
>> UNICORN_FD has something to do with it?
>
> UNICORN_FD is absolutely for the old master tells the new master about
> the listener sockets to inherit. ?Don''t touch it.
>
> <snip>
>
>> 3) cap deploy with symlinks + restart unicorn (kill -USR2)
>
> <snip>
>
>> addr=/var/www/lookbook/current/tmp/sockets/unicorn.sock fd=3
>
> You should make sure your socket is in a shared path, not current.
>
> Whatever''s in current gets replaced by Capistrano, right?
?I''m not sure
> if tmp is a symlink that''s relinked on a new deploy, but there
could be
> a race condition where the path to the socket is unreachable and
> nginx can''t see it.
>
> --
> Eric Wong
> _______________________________________________
> Unicorn mailing list - mongrel-unicorn at rubyforge.org
> http://rubyforge.org/mailman/listinfo/mongrel-unicorn
> Do not quote signatures (like this one) or top post when replying
>

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