I'm a Richardson, RU? » RubyOnRails

Wirble Woes: “Couldn’t load Wirble: no such file to load”

imarichardson — Sat, 21 Aug 2010 16:36:48 +0000

Recently, I decided to use Wirble to customize my console experience. I kept running into the following error after installing the gem:

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$ script/console
Loading development environment (Rails 2.3.5)
Couldn't load Wirble: no such file to load -- wirble
>>

The README wasn’t able to help much, as it only mentioned adding the Ruby path to the start of the ~/.irbrc file. The solution was to add a require ‘rubygems’ to the ~/.irbrc. Although the error didn’t mention it the problem was that wirble couldn’t load because rubygems were instantiated.
Here’s my current ~/.irbrc with the update:

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$LOAD_PATH << File.expand_path('~/.ruby')
begin
# load wirble
require 'rubygems'
require 'wirble'

# start wirble (with color)
Wirble.init
Wirble.colorize
rescue LoadError => err
warn "Couldn't load Wirble: #{err}"
end

Apache and Mongrel frustrations: 502, 503, Operation Not Permitted, Proxy Error, & Connection Refused Errors

imarichardson — Fri, 30 May 2008 16:38:53 +0000

For a good deal of time I’ve been experiencing numerous problems relating to mongrel and mongrel_cluster. I’ve received proxy errors from my main site:

Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /.

Reason: Error reading from remote server

Apache/2.2.3 (Red Hat) Server at [myserver.com] Port 443

And when viewing the log files I was receiving errors like:

[Mon May 26 23:51:38 2008] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): *
[Wed May 28 08:59:49 2008] [error] (111)Connection refused: proxy: HTTP: attempt to connect to 127.0.0.1:8050 (127.0.0.1) failed
[Wed May 28 08:59:49 2008] [error] ap_proxy_connect_backend disabling worker for (127.0.0.1)
[Wed May 28 08:59:49 2008] [error] (111)Connection refused: proxy: HTTP: attempt to connect to 127.0.0.1:8051 (127.0.0.1) failed
...
[Wed May 28 09:00:39 2008] [error] proxy: BALANCER: (balancer://url_cluster). All workers are in error state
[Fri May 30 08:15:10 2008] [error] [client xxx.xxx.xxx.xxx] proxy: error reading status line from remote server 127.0.0.1
[Fri May 30 08:15:10 2008] [error] [client xxx.xxx.xxx.xxx] proxy: Error reading from remote server returned by / ...

And this, too: (I tried these instructions too, but didn’t work.)

[Thu May 29 03:47:24 2008] [error] (111)Connection refused: proxy: HTTP: attempt to connect to 127.0.0.1:8000 (127.0.0.1) failed
[Thu May 29 03:47:24 2008] [error] ap_proxy_connect_backend disabling worker for (127.0.0.1)
[Thu May 29 03:47:24 2008] [error] (111)Connection refused: proxy: HTTP: attempt to connect to 127.0.0.1:8001 (127.0.0.1) failed
[Thu May 29 03:47:24 2008] [error] ap_proxy_connect_backend disabling worker for (127.0.0.1)

Additionally, I received “Operation Not Permitted” errors when trying to restart and/or stop the mongrel clusters:

** [out :: 208.112.64.164] Operation not permitted (Errno::EPERM)
** [out :: 208.112.64.164] from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/mongrel_rails:200:in `send_signal'
** [out :: 208.112.64.164] from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/mongrel_rails:240:in `run'
** [out :: 208.112.64.164] from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/../lib/mongrel/command.rb:212:in `run'
** [out :: 208.112.64.164] from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/mongrel_rails:281
** [out :: 208.112.64.164] from /usr/local/bin/mongrel_rails:19:in `load'
** [out :: 208.112.64.164] from /usr/local/bin/mongrel_rails:19
** [out :: 208.112.64.164] Sending TERM to Mongrel at PID 18429...

Solution

I was able to resolve the issue by killing all the active Mongrel processes and then restarting manually. You can do this by:

1. Viewing all active mongrel processes:

@imarichardson]$ ps -aef | egrep mongrel
root 3156 1 0 May15 ? 00:00:03 /usr/bin/ruby /usr/bin/mongrel_rails start -d -e production -p 8090 -a 127.0.0.1 -P log/mongrel.8090.pid -c /var/www/apps/[app_directory]/current
root 3159 1 0 May15 ? 00:00:02 /usr/bin/ruby /usr/bin/mongrel_rails start -d -e production -p 8091 -a 127.0.0.1 -P log/mongrel.8091.pid -c /var/www/apps/[app_directory]/current

(The second number is the process id; that is the id you’ll use to kill the process.)

2. Killing each process id

“sudo kill -9 [process id]“, For example, to kill the first process listed above:

@imarichardson]$ sudo kill -9 8090

3. Restarting your Mongrel instances

@imarichardson]$ sudo mongrel_rails cluster::restart --clean -C /var/www/apps/[app_directory]/current/config/mongrel_cluster.yml

“sudo gem update rails” doesn’t work

imarichardson — Fri, 08 Feb 2008 16:04:05 +0000

I’ve finally gotten to a point where I have been ready to upgrade to Rails 2.0.2 on one of my production machines (running Red Hat Enterprise 5). I ran into a little snag in that when trying to update rails; no error or anything, just a response that Rails 1.2.3 was installed:

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-bash-3.1$ sudo gem update rails
Password:
Updating installed gems...
Attempting remote update of rails
Successfully installed rails-2.0.2
Gems: [rails] updated

In order to get things working right I had to update the system files so everything would run:

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-bash-3.1$ sudo gem update --system
Updating RubyGems...
Attempting remote update of rubygems-update
Successfully installed rubygems-update-0.9.4
Updating version of RubyGems to 0.9.4
Installing RubyGems 0.9.4

Now running the update works.

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-bash-3.1$ sudo gem update -y rails
Updating installed gems...
Bulk updating Gem source index for: http://gems.rubyforge.org
Attempting remote update of rails
---------- this is where all the dependencies are updated ------------
Gems: [rails] updated

Installing Subversion Bindings for Warehouse App

imarichardson — Fri, 02 Nov 2007 03:57:08 +0000

A number of months ago ActiveReload came on the scene with a new application called “Warehouse” which makes for a really aesthetic and functional way of managing repositories in Subversion.

The app requires you to install the Ruby Subversion Bindings, and while it may seem quick in the instructions, it wasn’t like that for me installing on RHEL 5. (I’m following through the instructions listed here).

Be warned – you may want to go grab a cup of java and get comfortable, because this is a long one …

First of all I have a problem extracting and installing swig.

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$ tar xzvf swig-1.3.31.tar.gz
swig-1.3.31/
swig-1.3.31/Doc/
...
swig-1.3.31/Doc/Manual/SWIGDocumentation.pdf

gzip: stdin: unexpected end of file
tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now

I don’t know why it happened and why the file couldn’t extract so instead I went straight to the main sourceforge page (http://sourceforge.net/projects/swig/), download the latest build, and uploaded it to my server. Then follow the instructions using the new filename (for me it was “swig-1.3.32-rc1.tar.gz”).

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$ tar xzvf swig-1.3.32-rc1.tar.gz
$ cd ./swig-1.3.32-rc1
$ sudo ./configure
$ sudo make
$ sudo make install

This got me through the ./configure, but during the make I received an error that pointed to a missing “g++”.

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./Tools/config/depcomp: line 566: exec: g++: not found
make[2]: *** [Modules/allegrocl.o] Error 127
make[2]: Leaving directory `/home/richa088/swig-1.3.32-rc1/Source'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/richa088/swig-1.3.32-rc1/Source'
make: *** [source] Error 2

I then found out (by way of a 2 hour date with google) that by default RHEL5 doesn’t come with g++ installed. (I’m sure a much seasoned linuxologist would have figured it out quicker, but I digress.) So, using yum:

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$ sudo yum install gcc-c++
...
Transaction Test Succeeded
Running Transaction
Installing: libstdc++-devel ######################### [1/2]
Installing: gcc-c++ ######################### [2/2]

Installed: gcc-c++.i386 0:4.1.1-52.el5.2
Dependency Installed: libstdc++-devel.i386 0:4.1.1-52.el5.2
Complete!

In order to get the make to pass, I then had to re-run the configure. The make, and install succeeded afterwards.

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$ sudo ./configure
$ sudo make
$ sudo make install

But it’s not over yet. For step 2, I ran then tried to run the “make swig-rb” and received another error regarding the Apache Portable Runtime not being installed:

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============================================
WARNING: skipping the build of mod_dav_svn
--with-apxs or --with-apache must be used
============================================
configure: Apache Portable Runtime (APR) library configuration
checking for APR... no
configure: WARNING: APR not found
The Apache Portable Runtime (APR) library cannot be found.
Please install APR on this system and supply the appropriate
--with-apr option to 'configure'

or

get it with SVN and put it in a subdirectory of this source:
...
configure: error: no suitable apr found

As this post reveals, there is some newness between the Apache Portable Runtime (APR) and neon (don’t even ask me to explain) which make for an error in trying to install the bindings (the command “make swig-rb”). So to get by this, I followed the instructions by Josh Goebel at this pastie to get by. ***Note that on line 4 you need to omit the “tar.gz” as I’ve indicated below.

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$ cd neon-0.27.1
$ sudo ./configure --with-ssl --with-libs=/usr/local
...
checking for expat.h... no
checking for xml2-config... no
configure: error: no XML parser was found: expat or libxml 2.x required

WOW!!! When it rains it pours … while running the first config for neon, the process stopped because I didn’t have an XML parser on the system. (I’d thought the folks who set it up had done so, but that wasn’t the case.) So I installed expat with:

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$ yum install expat-devel
...
(1/1): expat-devel-1.95.8 100% |=========================| 130 kB 00:00
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing: expat-devel ######################### [1/1]

Installed: expat-devel.i386 0:1.95.8-8.2.1
Complete!

And after continuing through the remainder of the pastie, I’ve finally got subversion bindings installed! And now for the moment of truth …

1 2	$ -bash-3.1$ ruby -e 'puts require("svn/core")' true

Eureka! The test passed! Now I’ve got to actually install Warehouse … but I’ll save that for tomorrow. And I won’t even tell you how long it took me to finish all this stuff.

Here’s the complete pastie with my additions (depending on how your admin set things up you may have to sudo each line):

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$ sudo yum install expat-devel (if you don't have an XML parser installed)
$ cd /usr/local/src
$ curl -O http://www.webdav.org/neon/neon-0.27.1.tar.gz
$ tar zxvf neon-0.27.1.tar.gz
$ cd neon-0.27.1
$ ./configure --with-ssl --with-libs=/usr/local
$ make
$ sudo make install
$ cd ..
$ curl -O http://subversion.tigris.org/downloads/subversion-1.4.3.tar.gz
$ curl -O http://subversion.tigris.org/downloads/subversion-deps-1.4.3.tar.gz
$ tar xzvf subversion-1.4.3.tar.gz
$ tar xzvf subversion-deps-1.4.3.tar.gz
$ cd subversion-1.4.3
$ ./configure --prefix=/usr/local --with-openssl --with-ssl --with-zlib --with-neon=/usr/local
$ make
$ sudo make install
$ make swig-rb
$ make check-swig-rb (Most of these test's should pass)
$ sudo make install-swig-rb

12 Profile Shortcuts I can’t live without

imarichardson — Tue, 09 Oct 2007 14:59:51 +0000

If you’re a developer on a Mac or Linux box, building in Rails using Capistrano like me you can get really tired of having to “cd” to a 25 character long directory path 10 times a day while running all your script/”whatevers” while you work. Well, here’s my list of 12 shortcuts I can’t live without.

If you’re on a Mac, you’ll need to edit your “/etc/profile” page and then type these in, so something like “$textedit /etc/profile” or “$ mate /etc/profile” (if you are using TextMate) from your Terminal window will open your system profile.

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# /directories
alias gotoMyDir="cd /Some/Path/To/A/Frequently/Accessed_Directory"

# Rails
#The next shortcut only opens up the rails directories I care about using TextMate
alias matedir="mate app config lib db public test vendor/plugins &"
alias ss="./script/server"
alias sc="./script/console"
alias sg="./script/generate"
alias sp="./script/plugin"

#Rails Capistrano ... yes, I am using Capistrano 1.4.1 instead of 2.x
alias capd="cap _1.4.1_ deploy"
alias capdm="cap _1.4.1_ deploy_with_migrations"
alias capapache="cap _1.4.1_ restart_apache"
alias caprestart="cap _1.4.1_ restart_mongrel_cluster"
alias capstart="cap _1.4.1_ start_mongrel_cluster"
alias capstop="cap _1.4.1_ stop_mongrel_cluster"

Now what’s nice is that f I want to visit “my directory”, while in the terminal I just type”$ gotoMyDir”; if I need to run a capistrano “deploy_with_migrations” script (yes, I’m using 1.4.1 until a few more 2.0 updates finalize) I just type in “$ capdm” … you get the picture.

Nice indeed, and saves the keys!