January 21st, 2010 — Linux
Webpagetest.org is a great tool to learn how you can improve your website loading time (you should use it if you aren’t using it already).
Today after running a report I’ve seen that we had a large image on the home page that can be compressed to minimize loading time.
Smaller images means faster pages, faster pages means happy users 
. To compress images on Linux there are at least 2 alternatives:
OptiPNG: Advanced PNG Optimizer
OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections.
Install optipng package from EPEL repository:
[root@silver ~]# yum install optipng
[...]
[root@silver ~]# optipng
OptiPNG 0.6.2: Advanced PNG optimizer.
Copyright (C) 2001-2008 Cosmin Truta.
Type "optipng -h" for advanced help.
Synopsis:
optipng [options] files ...
Files:
Image files of type: PNG, BMP, GIF, PNM or TIFF
Basic options:
-h, -help show the advanced help
-v verbose mode / show copyright, version and build info
-o <level> optimization level (0-7) default 2
-i <type> interlace type (0-1) default <input>
-k, -keep keep a backup of the modified files
-q, -quiet quiet mode
Examples:
optipng file.png (default speed)
optipng -o5 file.png (moderately slow)
optipng -o7 file.png (very slow)Pngcrush
Pngcrush is an optimizer for PNG (Portable Network Graphics) files. It can be run from a commandline in an MSDOS window, or from a UNIX or LINUX commandline.
Its main purpose is to reduce the size of the PNG IDAT datastream by trying various compression levels an PNG filter methods. It also can be used to remove unwanted ancillary chunks, or to add certain chunks including gAMA, tRNS, iCCP, and textual chunks.
Install pngcrush from DAG’s repository:
[root@silver ~]# yum install pngcrush
[...]
[root@silver ~]# pngcrush --help
| pngcrush 1.7.3
| Copyright (C) 1998-2002,2006-2009 Glenn Randers-Pehrson
| Copyright (C) 2005 Greg Roelofs
| This is a free, open-source program. Permission is irrevocably
| granted to everyone to use this version of pngcrush without
| payment of any fee.
| Executable name is pngcrush
| It was built with libpng version 1.2.40, and is
| running with libpng version 1.2.40 - September 10, 2009
| Copyright (C) 1998-2004,2006-2009 Glenn Randers-Pehrson,
| Copyright (C) 1996, 1997 Andreas Dilger,
| Copyright (C) 1995, Guy Eric Schalnat, Group 42 Inc.,
| and zlib version 1.2.3.3, Copyright (C) 1998-2002 (or later),
| Jean-loup Gailly and Mark Adler.
| It was compiled with gcc version 4.1.2 20080704 (Red Hat 4.1.2-46).
[...]
usage: pngcrush [options] infile.png outfile.png
pngcrush -e ext [other options] files.png ...
pngcrush -d dir [other options] files.png ...
options:
[...]Now you can compress PNG images to reduce its size using command line:
[vitalie@silver ~]$ optipng -o7 example.png
[vitalie@silver ~]$ pngcrush -brute -e ".compressed.png" *png
I’ve achieved 20% – 24% file size reduction after compression.
More on the subject:
Indopedia
Raymond.cc
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
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
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 PILOops, we need to install PIL library, thanks to Dag this is extremely easy on CentOS/RHEL/Fedora:
yum install python-imaging
April 7th, 2009 — Linux, Plesk
We alreay know how to extract files from Plesk backup with mpack, but if you do receive “File size limit exceeded” error, it can be from the following reasons:
- Your file system doesn’t have LFS (large file support) support
- OS limits (limits on the system resources imposed by your administrator)
- mpack is not compiled with LFS
Check that your filesystem supports files bigger than 2GB (create a test file with “dd” command).
[vitalie@silver ~]$ dd if=/dev/zero of=test.bin bs=1G count=3 # create 3GB file
Then check your file size limits with ulimit command:
[vitalie@silver ~]$ ulimit -a | grep '^file size'
file size (blocks, -f) unlimited
You can adjust limits from /etc/security/limits.conf, read file comments on how to do it, or read this article:
http://www.cyberciti.biz/faq/file-size-limit-exceeded-error-under-linux-and-solution/
If none above limits you, then the problems comes from mpack, it doesn’t have suport for large files (>2GB).
The guys from the Plesk recommends to grep the backup file, to find begin and end of the file in archive:
http://kb.parallels.com/en/1757
This solutions is not appropriate for large backup files, we’ll just recompile mpack to support large files.
Grab mpack’s RPM source from the Dag’s repository
http://dag.wieers.com/rpm/packages/mpack/mpack-1.6-2.rf.src.rpm
install it:
[vitalie@silver ~]$ rpm -ivh mpack-1.6-2.rf.src.rpm
[...]
Then modify mpack.spec and add the following code after “%build”:
export CFLAGS="-D_FILE_OFFSET_BITS=64"
Then rebuild the package and install it:
[vitalie@silver ~] rpm -ba mpack.spec
[...]
[vitalie@silver ~] rpm -Uvh --force mpack-1.6-3.rf.i386.rpm
[...]
References:
February 8th, 2009 — Linux, Plesk
SMTP stands for Simple Mail Transfer Protocol, it was designed a long time ago when the Internet was a peaceful place. Today we are facing new challenges, so there should be new solutions.
One of the problem is SPAM messages, spammers are keeping to bombard us everyday with junk mails. We did invented black/white list to protect us from them.
If your clients are connecting from an ip address that’s listed in RBL lists (it’s not uncommon for ISPs that are using dynamic ip addresses) they can’t send messages through your server if you are using RBLs.
Disabling RBLs checks it’s not an option, we’ll configure an alternative port for relaying on port 1025 for the clients listed in RBLs.
You can just copy your smtp_psa file and customize it:
cd /etc/xinetd.d/
cp smtp_psa smtp_alt_psa
vim smtp_alt_psa
You need to change service name from smtp to smtp-alt and remove rblsmptd command and it’s -r parameters, finally it should something like this:
# /etc/xinetd.d/smtp_alt_psa
service smtp-alt
{
socket_type = stream
protocol = tcp
wait = no
disable = no
user = root
instances = UNLIMITED
server = /var/qmail/bin/tcp-env
server_args = -Rt0 /var/qmail/bin/relaylock /var/qmail/bin/qmail-smtpd /var/qmail/bin/smtp_auth /var/qmail/bin/true /var/qmail/bin/cmd5checkpw /var/qmail/bin/true
}Append the new service to /etc/services:
smtp-alt 1025/tcp
smtp-alt 1025/udp
And restart the xinetd service:
[root@sirius xinetd.d]# /etc/init.d/xinetd restart
Stopping xinetd: [ OK ]
Starting xinetd: [ OK ]
Verify your configuration with telnet command:
[root@sirius xinetd.d]# telnet localhost 1025
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 sirius.example.net ESMTP
# Ctr+] and quit to exit telnet
Now, instruct your clients to change port in SMTP settings from 25 to 1025, they will be able to send mails through your server even you are using RBL lists.
November 21st, 2008 — Linux
Open your /etc/modprobe.conf file and append:
# Turn off IPv6
alias net-pf-10 off
alias ipv6 off
Then restart your server.
August 2nd, 2008 — Linux, Plesk
Configuring apache for squirrelmail following this tutorial is not enough. You’ll need to configure squirrelmail too. Edit your /etc/squirrelmail/config_local.php file and paste the following configuration:
// courier-imap settings
$imap_server_type = 'courier';
$default_folder_prefix = 'INBOX.';
$trash_folder = 'Trash';
$sent_folder = 'Sent';
$draft_folder = 'Drafts';
$show_prefix_option = false;
$default_sub_of_inbox = false;
$show_contain_subfolders_option = false;
$optional_delimiter = '.';
$delete_folder = true;
$force_username_lowercase = false;
// other settings
$default_charset = 'iso-8859-1';
$lossy_encoding = false;
$sendmail_args = '-i -t';
$encode_header_key = '';
$hide_auth_header = false;
$plugins[3] = 'filters';
$abook_global_file = '';
$abook_global_file_writeable = false;
$addrbook_global_dsn = '';
$addrbook_global_table = 'global_abook';
$addrbook_global_writeable = false;
$addrbook_global_listing = false;
August 1st, 2008 — Linux
If you are working on a x86_64 system don’t even try to go with 64bit of FireFox, just install 32bit version and enjoy all FireFox’s plugins: flash, java, … don’t waste your time.
Adobe didn’t released yet a 64bit flash plugin for linux, although there exists different workarounds to make 32bit plugins to work on the x86_64 platform they are still buggy.
If you’ll try to use nspluginwrapper you’ll end up with FireFox eating 1GB of ram after you’ll open a few flash sites because it’s leaking memory.
Let’s go to install firefox with flash-plugin, firstly remove firefox x86_64 version and then install i386 version:
[root@silver ~]# yum remove firefox.x86_64
[...]
[root@silver ~]# yum install firefox.i386
[...]
Then we’ll download rpm for linux from Adobe :
http://www.adobe.com/shockwave/download/alternates/
[root@silver ~]# rpm -ivh flash-plugin-9.0.124.0-release.i386.rpm
[...]
Now, you are ready to use your favorite browser on linux x86_64 with flash player.
Update:
An alpha refresh of 64-bit Adobe Flash Player 10 for Linux operating systems was released on 12/16/2008.
Download it from here:
http://labs.adobe.com/downloads/flashplayer10.html
August 1st, 2008 — Linux
If are seeing a lots of “TCP: drop open request from A.B.C.D” messages and you don’t expect a real load the server, you’ll need to enable syncookies. Edit your /etc/sysctl.conf and append the following lines:
# enable syncookies
net.ipv4.tcp_syncookies = 1
Then restart network service.
[root@centurion ~]# /etc/init.d/network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Setting network parameters: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]