Entries from October 2009 ↓

Howto install RMagick 2 on CentOS/RHEL 5

October 24th, 2009 — Linux, Rails, Ruby

Installing RMagick 2 on CentOS/RHEL 5 it’s not that hard, you just need to install ImageMagick newer than 6.3.5 (CentOS/RHEL 5 is shipping ImageMagick 6.2.8) and that’s the hardest part of the job.

[root@silver ~]# gem install rmagick
Building native extensions.  This could take a while...
ERROR:  Error installing rmagick:
        ERROR: Failed to build gem native extension.
 
/usr/local/bin/ruby extconf.rb
checking for Ruby version >= 1.8.5... yes
checking for gcc... yes
checking for Magick-config... yes
checking for ImageMagick version >= 6.3.5... no
Can't install RMagick 2.12.2. You must have ImageMagick 6.3.5 or later.

I’ve tried to avoid ImageMagick upgrade and to install RMagick 1, but RMagick 1 failed to install with a strange compile error, probably because the gcc compliler shipped with CentOS/RHEL 5 is too new for version 1.

I didn’t wanted to patch RMagick 1, neither to install from sources (I do prefer RPM packages). So, I’ve decided to upgrade ImageMagick library to satisfy RMagick 2 requirements.

Subscribe your system to the following repositories:

Install the following packages:

[root@silver ~]# yum --enablerepo=epel --enablerepo=rpmforge --enablerepo=centosplus install djvulibre-devel libwmf-devel jasper-devel libtool-ltdl-devel librsvg2-devel openexr-devel graphviz-devel gcc gcc-c++ ghostscript freetype-devel libjpeg-devel libpng-devel giflib-devel libwmf-devel libexif-devel libtiff-devel

Add “–noplugins” if you are using “yum-priorities”, or it will fail to install packages.

Download ImageMagick.spec to your SPECS directory and ImageMagick-6.5.7-0.tar.bz2 to SOURCES directory and then rebuild the rpm using rpmbuild:

[root@silver SPECS]# rpmbuild -ba ImageMagick.spec
 
[...]

Or just grab the source RPM from here:
http://red.penguin.ro/SRPMS/ImageMagick-6.5.7-0.src.rpm

and build it:

[root@silver ~]# rpmbuild --rebuild ImageMagick-6.5.7-0.src.rpm 
Installing ImageMagick-6.5.7-0.src.rpm
warning: user vitalie does not exist - using root
warning: group vitalie does not exist - using root
warning: user vitalie does not exist - using root
warning: group vitalie does not exist - using root
Executing(%prep): /bin/sh -e /home/worf/rpmbuild/tmp/rpm-tmp.11936
+ umask 022
+ cd /home/worf/rpmbuild/BUILD
+ LANG=C
+ export LANG
+ unset DISPLAY
+ cd /home/worf/rpmbuild/BUILD
+ rm -rf ImageMagick-6.5.7-0
+ /usr/bin/bzip2 -dc /home/worf/rpmbuild/SOURCES/ImageMagick-6.5.7-0.tar.bz2
+ tar -xf -
 
[...]
 
Requires(rpmlib): rpmlib(CompressedFileNames) <= 3.0.4-1 rpmlib(PayloadFilesHavePrefix) <= 4.0-1
Requires: /bin/sh ImageMagick-c++ = 6.5.7-0 ImageMagick-devel = 6.5.7-0 libMagick++.so.2()(64bit)
Processing files: ImageMagick-debuginfo-6.5.7-0
Provides: Magick.so.debug()(64bit) analyze.so.debug()(64bit) art.so.debug()(64bit) avi.so.debug()(64bit) avs.so.debug()(64bit) bmp.so.debug()(64bit) braille.so.debug()(64bit) cals.so.debug()(64bit) caption.so.debug()(64bit) cin.so.debug()(64bit) cip.so.debug()(64bit) clip.so.debug()(64bit) cmyk.so.debug()(64bit) cut.so.debug()(64bit) dcm.so.debug()(64bit) dds.so.debug()(64bit) dib.so.debug()(64bit) djvu.so.debug()(64bit) dng.so.debug()(64bit) dot.so.debug()(64bit) dpx.so.debug()(64bit) ept.so.debug()(64bit) fax.so.debug()(64bit) fits.so.debug()(64bit) gif.so.debug()(64bit) gradient.so.debug()(64bit) gray.so.debug()(64bit) hald.so.debug()(64bit) histogram.so.debug()(64bit) hrz.so.debug()(64bit) html.so.debug()(64bit) icon.so.debug()(64bit) info.so.debug()(64bit) inline.so.debug()(64bit) ipl.so.debug()(64bit) jp2.so.debug()(64bit) jpeg.so.debug()(64bit) label.so.debug()(64bit) libMagick++.so.2.0.0.debug()(64bit) libMagickCore.so.2.0.0.debug()(64bit) libMagickWand.so.2.0.0.debug()(64bit) magick.so.debug()(64bit) map.so.debug()(64bit) mat.so.debug()(64bit) matte.so.debug()(64bit) meta.so.debug()(64bit) miff.so.debug()(64bit) mono.so.debug()(64bit) mpc.so.debug()(64bit) mpeg.so.debug()(64bit) mpr.so.debug()(64bit) msl.so.debug()(64bit) mtv.so.debug()(64bit) mvg.so.debug()(64bit) null.so.debug()(64bit) otb.so.debug()(64bit) palm.so.debug()(64bit) pattern.so.debug()(64bit) pcd.so.debug()(64bit) pcl.so.debug()(64bit) pcx.so.debug()(64bit) pdb.so.debug()(64bit) pdf.so.debug()(64bit) pict.so.debug()(64bit) pix.so.debug()(64bit) plasma.so.debug()(64bit) png.so.debug()(64bit) pnm.so.debug()(64bit) preview.so.debug()(64bit) ps.so.debug()(64bit) ps2.so.debug()(64bit) ps3.so.debug()(64bit) psd.so.debug()(64bit) pwp.so.debug()(64bit) raw.so.debug()(64bit) rgb.so.debug()(64bit) rla.so.debug()(64bit) rle.so.debug()(64bit) scr.so.debug()(64bit) sct.so.debug()(64bit) sfw.so.debug()(64bit) sgi.so.debug()(64bit) stegano.so.debug()(64bit) sun.so.debug()(64bit) svg.so.debug()(64bit) tga.so.debug()(64bit) thumbnail.so.debug()(64bit) tiff.so.debug()(64bit) tile.so.debug()(64bit) tim.so.debug()(64bit) ttf.so.debug()(64bit) txt.so.debug()(64bit) uil.so.debug()(64bit) url.so.debug()(64bit) uyvy.so.debug()(64bit) vicar.so.debug()(64bit) vid.so.debug()(64bit) viff.so.debug()(64bit) wbmp.so.debug()(64bit) wmf.so.debug()(64bit) wpg.so.debug()(64bit) x.so.debug()(64bit) xbm.so.debug()(64bit) xc.so.debug()(64bit) xcf.so.debug()(64bit) xpm.so.debug()(64bit) xps.so.debug()(64bit) xwd.so.debug()(64bit) ycbcr.so.debug()(64bit) yuv.so.debug()(64bit)
Requires(rpmlib): rpmlib(CompressedFileNames) <= 3.0.4-1 rpmlib(PayloadFilesHavePrefix) <= 4.0-1
Checking for unpackaged file(s): /usr/lib/rpm/check-files /home/worf/rpmbuild/tmp/ImageMagick-6.5.7-0-root-root
Wrote: /home/worf/rpmbuild/RPMS/x86_64/ImageMagick-6.5.7-0.x86_64.rpm
Wrote: /home/worf/rpmbuild/RPMS/x86_64/ImageMagick-devel-6.5.7-0.x86_64.rpm
Wrote: /home/worf/rpmbuild/RPMS/x86_64/ImageMagick-doc-6.5.7-0.x86_64.rpm
Wrote: /home/worf/rpmbuild/RPMS/x86_64/ImageMagick-perl-6.5.7-0.x86_64.rpm
Wrote: /home/worf/rpmbuild/RPMS/x86_64/ImageMagick-c++-6.5.7-0.x86_64.rpm
Wrote: /home/worf/rpmbuild/RPMS/x86_64/ImageMagick-c++-devel-6.5.7-0.x86_64.rpm
Wrote: /home/worf/rpmbuild/RPMS/x86_64/ImageMagick-debuginfo-6.5.7-0.x86_64.rpm
Executing(%clean): /bin/sh -e /home/worf/rpmbuild/tmp/rpm-tmp.25482
+ umask 022
+ cd /home/worf/rpmbuild/BUILD
+ cd ImageMagick-6.5.7-0
+ rm -rf /home/worf/rpmbuild/tmp/ImageMagick-6.5.7-0-root-root
+ exit 0
Executing(--clean): /bin/sh -e /home/worf/rpmbuild/tmp/rpm-tmp.25482
+ umask 022
+ cd /home/worf/rpmbuild/BUILD
+ rm -rf ImageMagick-6.5.7-0
+ exit 0

Uninstall i386 ImageMagick libraries if you are on x86_64 system:

[root@silver ~]# rpm -qa | grep ImageMagick | grep -i i386 | xargs rpm -e

Install the new RPMs compiled in the previous steps:

[root@silver x86_64]# rpm -Uvh ImageMagick-6.5.7-0.x86_64.rpm ImageMagick-c++-6.5.7-0.x86_64.rpm ImageMagick-c++-devel-6.5.7-0.x86_64.rpm ImageMagick-devel-6.5.7-0.x86_64.rpm

Finally, install the RMagick 2 plugin:

[root@silver ~]# gem install rmagick --no-rdoc --no-ri
Building native extensions.  This could take a while...
Successfully installed rmagick-2.12.2
1 gem installed

7 Comments

Ruby Enterprise Edition 1.8.7 source RPM for CentOS5 / RHEL5

October 21st, 2009 — Ruby

Ruby Enterprise Edition is a server-oriented friendly branch of Ruby which includes various enhancements:

* A copy-on-write friendly garbage collector. Phusion Passenger uses this, in combination with a technique called preforking, to reduce Ruby on Rails applications’ memory usage by 33% on average.
* An improved memory allocator called tcmalloc, which improves performance quite a bit.
* The ability to tweak garbage collector settings for maximum server performance, and the ability to inspect the garbage collector’s state. (RailsBench GC patch)
* The ability to dump stack traces for all running threads (caller_for_all_threads), making it easier for one to debug multithreaded Ruby web applications.

More on Ruby Enterprise Edition’s website:
http://www.rubyenterpriseedition.com/

Download source rpm:
ruby-enterprise-1.8.7-1.el5.src.rpm

Build rpm package using rpmbuild:

[vitalie@silver SRPMS]$ rpmbuild --rebuild --define 'dist el5' ruby-enterprise-1.8.7-1.el5.src.rpm 
Installing ruby-enterprise-1.8.7-1.el5.src.rpm
Executing(%prep): /bin/sh -e /home/vitalie/rpmbuild/tmp/rpm-tmp.89437
+ umask 022
+ cd /home/vitalie/rpmbuild/BUILD
+ LANG=C
+ export LANG
+ unset DISPLAY
+ cd /home/vitalie/rpmbuild/BUILD
+ rm -rf ruby-enterprise-1.8.7-20090928
+ /bin/gzip -dc /home/vitalie/rpmbuild/SOURCES/ruby-enterprise-1.8.7-20090928.tar.gz
+ tar -xf -
+ STATUS=0
+ '[' 0 -ne 0 ']'
+ cd ruby-enterprise-1.8.7-20090928
++ /usr/bin/id -u
+ '[' 500 = 0 ']'
++ /usr/bin/id -u
+ '[' 500 = 0 ']'
+ /bin/chmod -Rf a+rX,u+w,g-w,o-w .
+ exit 0
Executing(%build): /bin/sh -e /home/vitalie/rpmbuild/tmp/rpm-tmp.89437
+ umask 022
+ cd /home/vitalie/rpmbuild/BUILD
+ cd ruby-enterprise-1.8.7-20090928
+ LANG=C
+ export LANG
+ unset DISPLAY
+ ./installer --auto /usr/local --dont-install-useful-gems --destdir /home/vitalie/rpmbuild/tmp/ruby-enterprise-1.8.7-20090928-root-vitalie
 
[...]
 
Provides: ruby-enterprise(rubygems) = 1.3.2
Requires(interp): /bin/sh
Requires(rpmlib): rpmlib(CompressedFileNames) <= 3.0.4-1 rpmlib(PayloadFilesHavePrefix) <= 4.0-1 rpmlib(VersionedDependencies) <= 3.0.3-1
Requires(pre): /bin/sh
Requires: /usr/local/bin/ruby ruby-enterprise >= 1.8
Processing files: ruby-enterprise-debuginfo-1.8.7-1.el5
Provides: bigdecimal.so.debug()(64bit) bubblebabble.so.debug()(64bit) cparse.so.debug()(64bit) curses.so.debug()(64bit) dbm.so.debug()(64bit) digest.so.debug()(64bit) dl.so.debug()(64bit) etc.so.debug()(64bit) fcntl.so.debug()(64bit) gdbm.so.debug()(64bit) iconv.so.debug()(64bit) libtcmalloc_minimal.so.0.0.0.debug()(64bit) md5.so.debug()(64bit) nkf.so.debug()(64bit) openssl.so.debug()(64bit) pty.so.debug()(64bit) readline.so.debug()(64bit) rmd160.so.debug()(64bit) sdbm.so.debug()(64bit) sha1.so.debug()(64bit) sha2.so.debug()(64bit) socket.so.debug()(64bit) stringio.so.debug()(64bit) strscan.so.debug()(64bit) syck.so.debug()(64bit) syslog.so.debug()(64bit) thread.so.debug()(64bit) wait.so.debug()(64bit) zlib.so.debug()(64bit)
Requires(rpmlib): rpmlib(CompressedFileNames) <= 3.0.4-1 rpmlib(PayloadFilesHavePrefix) <= 4.0-1
Checking for unpackaged file(s): /usr/lib/rpm/check-files /home/vitalie/rpmbuild/tmp/ruby-enterprise-1.8.7-20090928-root-vitalie
Wrote: /home/vitalie/rpmbuild/RPMS/x86_64/ruby-enterprise-1.8.7-1.el5.x86_64.rpm
Wrote: /home/vitalie/rpmbuild/RPMS/x86_64/ruby-enterprise-rubygems-1.3.2-1.el5.x86_64.rpm
Wrote: /home/vitalie/rpmbuild/RPMS/x86_64/ruby-enterprise-debuginfo-1.8.7-1.el5.x86_64.rpm
Executing(%clean): /bin/sh -e /home/vitalie/rpmbuild/tmp/rpm-tmp.76776
+ umask 022
+ cd /home/vitalie/rpmbuild/BUILD
+ cd ruby-enterprise-1.8.7-20090928
+ rm -rf /home/vitalie/rpmbuild/tmp/ruby-enterprise-1.8.7-20090928-root-vitalie
+ exit 0
Executing(--clean): /bin/sh -e /home/vitalie/rpmbuild/tmp/rpm-tmp.76776
+ umask 022
+ cd /home/vitalie/rpmbuild/BUILD
+ rm -rf ruby-enterprise-1.8.7-20090928
+ exit 0

Alternatively you can download just spec file and grab sources from the REE’s website:
ruby-enterprise.spec

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acts_as_redis_counter plugin

October 16th, 2009 — ActsAsRedisCounter, Rails

I’ve just released acts_as_redis_counter plugin for Rails.

Description:

The acts_as_redis_counter plugin implements high performance counters using write-back strategy with Redis key-value database.

Enjoy it!
http://github.com/vitalie/acts_as_redis_counter

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Easy Rails virtual hosts with mod_macro

October 15th, 2009 — Linux, Rails

Keeping a separate file for each virtual host in /etc/httpd/vhosts.d it’s clean and cool, but when you have many virtual hosts with same settings it’s a pain to keep them updated. We need a template system for Apache configurations and mod_macro module it’s a handy tool for this job.

Download module version suited for your Apache from:
http://www.cri.ensmp.fr/~coelho/mod_macro/

Ensure that you have httpd-devel package installed then untar archive and compile mod_macro module with apxs:

[root@silver tmp]# wget http://www.cri.ensmp.fr/~coelho/mod_macro/mod_macro-1.1.10.tar.bz2
 
[...]
 
[root@silver tmp]# tar xvfjp mod_macro-1.1.10.tar.bz2 
 
[...]
 
[root@silver tmp]# cd mod_macro-1.1.10
[root@silver mod_macro-1.1.10]# apxs -cia mod_macro.c 
/usr/lib64/apr-1/build/libtool --silent --mode=compile gcc -prefer-pic -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fno-strict-aliasing  -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -pthread -I/usr/include/httpd  -I/usr/include/apr-1   -I/usr/include/apr-1   -c -o mod_macro.lo mod_macro.c && touch mod_macro.slo
mod_macro.c: In function 'looks_like_an_argument':
mod_macro.c:316: warning: cast from pointer to integer of different size
mod_macro.c: In function 'say_it':
mod_macro.c:929: warning: cast from pointer to integer of different size
/usr/lib64/apr-1/build/libtool --silent --mode=link gcc -o mod_macro.la  -rpath /usr/lib64/httpd/modules -module -avoid-version    mod_macro.lo
/usr/lib64/httpd/build/instdso.sh SH_LIBTOOL='/usr/lib64/apr-1/build/libtool' mod_macro.la /usr/lib64/httpd/modules
/usr/lib64/apr-1/build/libtool --mode=install cp mod_macro.la /usr/lib64/httpd/modules/
cp .libs/mod_macro.so /usr/lib64/httpd/modules/mod_macro.so
cp .libs/mod_macro.lai /usr/lib64/httpd/modules/mod_macro.la
cp .libs/mod_macro.a /usr/lib64/httpd/modules/mod_macro.a
chmod 644 /usr/lib64/httpd/modules/mod_macro.a
ranlib /usr/lib64/httpd/modules/mod_macro.a
PATH="$PATH:/sbin" ldconfig -n /usr/lib64/httpd/modules
----------------------------------------------------------------------
Libraries have been installed in:
   /usr/lib64/httpd/modules
 
If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,--rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'
 
See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
chmod 755 /usr/lib64/httpd/modules/mod_macro.so
[activating module `macro' in /etc/httpd/conf/httpd.conf]

Create a file that will keep your macros in Apache’s conf.d directory (example: _mod_macro.conf), conf.d files are executed after modules are loaded:

# /etc/httpd/conf.d/_mod_macro.conf
 
# RailsHost macro
<Macro RailsHost $host $dir>
  <VirtualHost *:80>
    ServerName www.$host
    ServerAlias $host
    DocumentRoot $dir/current/public
 
    CustomLog "logs/$host_access.log" combined
    ErrorLog "logs/$host_error.log"
 
    # Passenger settings
    RailsBaseURI /
    RailsMaxPoolSize 1
    RailsPoolIdleTime 3600
    RailsEnv production
 
    # Redirect example.com -> www.example.com
    RewriteEngine On
    RewriteCond %{HTTP_HOST} !^www.$host
    RewriteRule ^/(.*) http://www.$host/$1 [R=301,L]
 
    # Check for maintenance file and redirect all requests
    RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
    RewriteCond %{SCRIPT_FILENAME} !maintenance.html
    RewriteCond %{SCRIPT_FILENAME} !^/images
    RewriteCond %{SCRIPT_FILENAME} !^/stylesheets
    RewriteCond %{SCRIPT_FILENAME} !^/javascripts
    RewriteRule ^.*$ /system/maintenance.html [L]
 
    ErrorDocument 404 $dir/current/public/404.html
    ErrorDocument 422 $dir/current/public/422.html
    ErrorDocument 500 $dir/current/public/500.html
 
    Use ModDeflate
    Use ModExpires
 
    <Directory $dir/current/public>
      Options FollowSymLinks
      AllowOverride None
      Order allow,deny
      Allow from all
    </Directory>
  </VirtualHost>
</Macro>
 
# ModDeflate macro
<Macro ModDeflate>
  <IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/plain
    AddOutputFilterByType DEFLATE text/html
    AddOutputFilterByType DEFLATE text/xml
    AddOutputFilterByType DEFLATE text/css
    AddOutputFilterByType DEFLATE application/xml
    AddOutputFilterByType DEFLATE application/xhtml+xml
    AddOutputFilterByType DEFLATE application/rss+xml
    AddOutputFilterByType DEFLATE application/javascript
    AddOutputFilterByType DEFLATE application/x-javascript
 
    BrowserMatch ^Mozilla/4 gzip-only-text/html
    BrowserMatch ^Mozilla/4\.0[678] no-gzip
    BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
  </IfModule>
</Macro>
 
# ModExpires macro
<Macro ModExpires>
  <IfModule mod_expires.c>
    ExpiresActive On
    <LocationMatch "^/(images|javascripts|stylesheets)">
      ExpiresDefault "access plus 1 year"
    </LocationMatch>
  </IfModule>
</Macro>

Append RailsHost macro calls to your httpd.conf to define your virtual hosts :

# /etc/httpd/conf/httpd.conf
 
[...]
 
Use RailsHost vhost1.com /data/virtualhosts/vhost1.com
Use RailsHost vhost2.com /data/virtualhosts/vhost2.com

Now, your Apache configuration looks much better and when it comes make changes to your configurations you’ll need to change just one macro.

1 Comment

Configure DenyHosts to ignore local networks

October 12th, 2009 — Linux, Security

I would not talk about how important is to secure your ssh server. One of the tools that helps us to secure ssh server is DenyHosts. From the DenyHosts home page:

DenyHosts is a script intended to be run by Linux system administrators to help thwart SSH server attacks (also known as dictionary based attacks and brute force attacks).

Sending accidentally wrong password to server will block your access. You can avoid it by using public key authentication or when it’s not possible you can configure DenyHosts to ignore IP addresses from your network:

How can I prevent a legitimate IP address from being blocked by DenyHosts?

Since it is quite possible for a user to mistype their password repeatedly it may be desirable to have DenyHosts prevent specific IP addresses from being added to /etc/hosts.deny. To address this issue, create a file named allowed-hosts in the WORK_DIR. Simply add an IP address, one per line. Any IP address that appears in this file will not be blocked.
[...]

more

I do prefer the TCP wrappers way, I’ll just bypass DenyHosts for local networks.

Configure DenyHosts to write blocked IPs to /etc/denyhosts/blocked:

# /etc/denyhosts/denyhosts.cfg
HOSTS_DENY = /etc/denyhosts/blocked
BLOCK_SERVICE  =

Allow ssh connection if listed in /etc/denyhosts/ignored, and then the last rule is to allow ssh access unless listed in /etc/denyhosts/blocked:

#
# hosts.allow   This file describes the names of the hosts which are
#               allowed to use the local INET services, as decided
#               by the '/usr/sbin/tcpd' server.
#
 
# ssh access
sshd: /etc/denyhosts/ignored : allow
sshd: ALL EXCEPT /etc/denyhosts/blocked

Add IPs/networks to ignore:

# /etc/denyhosts/ignored
# hosts allowed to connect bypassing DenyHosts
192.168.10.0/255.255.255.0

More on the file format:

man hosts.allow

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ImportError: No module named PIL

October 11th, 2009 — Python

After server reinstall Plone website failed to start:

2009-10-11T13:45:56 ERROR Application Could not import Products.ATContentTypes
Traceback (most recent call last):
  File "/data/user/site/parts/zope2/lib/python/OFS/Application.py", line 709, in import_product
    product=__import__(pname, global_dict, global_dict, silly)
  File "/home/apc/ecc/parts/plone/ATContentTypes/__init__.py", line 64, in ?
    import Products.ATContentTypes.content
  File "/home/apc/ecc/parts/plone/ATContentTypes/content/__init__.py", line 26, in ?
    import Products.ATContentTypes.content.link
  File "/home/apc/ecc/parts/plone/ATContentTypes/content/link.py", line 39, in ?
    from Products.ATContentTypes.content.base import registerATCT
  File "/home/apc/ecc/parts/plone/ATContentTypes/content/base.py", line 63, in ?
    from Products.CMFPlone.PloneFolder import ReplaceableWrapper
  File "/home/apc/ecc/parts/plone/CMFPlone/__init__.py", line 215, in ?
    from browser import ploneview
  File "/home/apc/ecc/parts/plone/CMFPlone/browser/ploneview.py", line 12, in ?
    from Products.CMFPlone import utils
  File "/home/apc/ecc/parts/plone/CMFPlone/utils.py", line 5, in ?
    from PIL import Image
ImportError: No module named PIL

Oops, we need to install PIL library, thanks to Dag this is extremely easy on CentOS/RHEL/Fedora:

yum install python-imaging

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Problems with Seagate FreeAgent Go extrernal USB drive

October 9th, 2009 — Linux

Firstly I thought it’s that my hard drive it’s faulty, because while writing a few large files it failed with the following messages:

sd 3:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, initializing command required
 
end_request: I/O error, dev sdb, sector 794703
EXT3-fs error (device sdb1): read_inode_bitmap: Cannot read inode bitmap - block_group = 3, inode_bitmap = 99330
Aborting journal on device sdb1.
sd 3:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, initializing command required
 
end_request: I/O error, dev sdb, sector 12423
Buffer I/O error on device sdb1, logical block 1545
lost page write due to I/O error on sdb1
sd 3:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, initializing command required
 
end_request: I/O error, dev sdb, sector 63
Buffer I/O error on device sdb1, logical block 0
lost page write due to I/O error on sdb1
EXT3-fs error (device sdb1) in ext3_new_inode: IO failure
EXT3-fs error (device sdb1) in ext3_create: IO failure
ext3_abort called.
EXT3-fs error (device sdb1): ext3_journal_start_sb: Detected aborted journal
Remounting filesystem read-only

After googling around I’ve found this thread:
http://ubuntuforums.org/showthread.php?t=494673

Thanks to trolav, I’ve solved my problem.

[root@silver ~]# cat /etc/udev/rules.d/85-usb-hd-fix.rules
BUS=="scsi", KERNEL=="sd?", SYSFS{vendor}=="Seagate", SYSFS{model}=="FreeAgent Go", RUN+="/scripts/usbhdfix %k"
[root@silver ~]# cat /scripts/usbhdfix 
#!/bin/bash
 
# USB FIX:
# http://ubuntuforums.org/showthread.php?t=494673
 
echo 1024 > /sys/block/$1/device/max_sectors
echo 1 > /sys/block/$1/device/scsi_disk:*/allow_restart

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