linuxsutra

Continued from SVN STACK Design / Install / Configure / Repository Mirroring(write thru proxy) / Repository Migration(cvs2svn), Repository Browsing(websvn), Repository Search(gonzui) - I

  5. SVN Install Instructions( continued from previous article)
          * SVNSYNC
          * REVERSE SYNC
          * SYNC AUTOMATE
          * WRITE THRU PROXY
   6. Errors & Resolutions
   7. WebSVN
   8. gonzui

SVNSYNC

  On MySubversionAmericaServer:
       /home/myname/apache-2.2.6/bin/htpasswd -m /home/myname/apache-2.2.6/etc/svn-auth-file svnsync
       Password: mylab
       /etc/rc3.d/S99svn reload
       TODO: remove svn rpm default installation
       su svn
               /home/myname/subversion/bin/svnadmin create /svnroot/MySubversionIndiaServer
       cp /svnroot/MySubversionIndiaServer/hooks/start-commit.tmpl /svnroot/MySubversionIndiaServer/hooks/start-commit
       vi /svnroot/MySubversionIndiaServer/hooks/start-commit
       :50 Added below lines
               if [ "$USER" = "svnsync" ]; then exit 0; fi
               echo "Only the svnsync user may commit new revisions as this is a read-only, mirror repository." >&2
               exit 1
       cp /svnroot/MySubversionIndiaServer/hooks/pre-revprop-change.tmpl /svnroot/MySubversionIndiaServer/hooks/pre-revprop-change
       vi /svnroot/MySubversionIndiaServer/hooks/pre-revprop-change
       :63 Added below lines
               if [ "$USER" = "svnsync" ]; then exit 0; fi
               echo "Only the svnsync user may change revision properties as this is a read-only, mirror repository."  >&2
               exit 1
       chmod -R 0755 /svnroot/MySubversionIndiaServer/hooks/*
       vi /home/myname/apache-2.2.6/conf/httpd.conf
       #Extra section added for MySubversionIndiaServer
               #Subversion repository
               <Location /MySubversionIndiaServer>
                  DAV svn
                  SVNPath /svnroot/MySubversionIndiaServer
                  #SVNAutoversioning on
                  #ModMimeUsePathInfo on
                  AuthType Basic
                  AuthName "Subversion repository"
                  AuthUserFile /home/myname/apache-2.2.6/etc/svn-auth-file
                  Require valid-user
               </Location>
       chown -R svn:svn /svnroot/MySubversionIndiaServer
       /etc/rc3.d/S99svn reload

  On MySubversionIndiaServer:
       /home/myname/svn/softwares/apache-2.2.6/bin/htpasswd -m /home/myname/svn/softwares/apache-2.2.6/etc/svn-auth-file svnsync
       Password: <PASSWORD>
       /etc/init.d/httpd-svn reload
       svnsync initialize http://MySubversionAmericaServer/MySubversionIndiaServer/ http://MySubversionIndiaServer/svn/ --username=svnsync --password=<PASSWORD>
       svnsync synchronize http://MySubversionAmericaServer/MySubversionIndiaServer/ --username=svnsync --password=<PASSWORD>

REVERSE SYNC:

  On MySubversionIndiaServer:
       su svn
               svnadmin create /home/myname/svn/MySubversionAmericaServer
       vi /home/myname/svn/MySubversionAmericaServer/hooks/start-commit.tmpl
       :50 Added below lines
               if [ "$USER" = "svnsync" ]; then exit 0; fi
               echo "Only the svnsync user may commit new revisions as this is a read-only, mirror repository." >&2
               exit 1
       cp /home/myname/svn/MySubversionAmericaServer/hooks/start-commit.tmpl /home/myname/svn/MySubversionAmericaServer/hooks/start-commit
       vi /home/myname/svn/MySubversionAmericaServer/hooks/pre-revprop-change.tmpl
       :63 Added below lines
               if [ "$USER" = "svnsync" ]; then exit 0; fi
               echo "Only the svnsync user may change revision properties as this is a read-only, mirror repository."  >&2
               exit 1
       cp /home/myname/svn/MySubversionAmericaServer/hooks/pre-revprop-change.tmpl /home/myname/svn/MySubversionAmericaServer/hooks/pre-revprop-change
       chmod -R 0755 /home/myname/svn/MySubversionAmericaServer/hooks/*
       vi /home/myname/svn/softwares/apache-2.2.6/conf/httpd.conf
       #Extra section added for MySubversionIndiaServer
               #Subversion repository
               <Location /MySubversionAmericaServer>
                  DAV svn
                  SVNPath /home/myname/svn/MySubversionAmericaServer
                  #SVNAutoversioning on
                  #ModMimeUsePathInfo on
                  AuthType Basic
                  AuthName "Subversion repository"
                  AuthUserFile /home/myname/svn/softwares/apache-2.2.6/etc/svn-auth-file
                  Require valid-user
               </Location>
       chown -R svn:svn /home/myname/svn/MySubversionAmericaServer
       /etc/init.d/httpd-svn reload

  On MySubversionAmericaServer:
       /home/myname/subversion/bin/svnsync initialize http://MySubversionIndiaServer/MySubversionAmericaServer/ http://MySubversionAmericaServer/svn/ --username=svnsync --password=<PASSWORD>
       /home/myname/subversion/bin/svnsync synchronize http://MySubversionIndiaServer/MySubversionAmericaServer/ --username=svnsync --password=<PASSWORD>
               Error:
                       svnsync: PROPFIND of '/MySubversionAmericaServer': Could not resolve hostname `MySubversionIndiaServer'
               Resolution:
                       ip instead of hostname
       /home/myname/subversion/bin/svnsync initialize http://MySubversionIndiaServer/MySubversionAmericaServer/ http://MySubversionAmericaServer/svn/ --username=svnsync --password=<PASSWORD>
       /home/myname/subversion/bin/svnsync synchronize http://MySubversionIndiaServer/MySubversionAmericaServer/ --username=svnsync --password=<PASSWORD>

SYNC AUTOMATE:(using post commit hooks, but, not crons)

       MySubversionAmericaServer:
               su svn
               cp /svnroot/training/hooks/post-commit.tmpl /svnroot/training/hooks/post-commit
               vi /svnroot/training/hooks/post-commit
               Added at the end of the file:
                       /home/myname/subversion/bin/svnsync synchronize http://MySubversionIndiaServer/MySubversionAmericaServer/ --username=svnsync --password=<PASSWORD>
                       exit 0
               chmod 0755 /svnroot/training/hooks/*
       MySubversionIndiaServer:
               su svn
               cp /home/myname/svn/projects/hooks/post-commit.tmpl /home/myname/svn/projects/hooks/post-commit
               vi /home/myname/svn/projects/hooks/post-commit
               Added at the end of the file:
                       /home/myname/svn/softwares/subversion-1.4.5/bin/svnsync synchronize http://MySubversionAmericaServer/MySubversionIndiaServer/ --username=svnsync --password=<PASSWORD>
                       exit 0
               chmod 0755 /home/myname/svn/projects/hooks/*
       Test:
               modify a file in MySubversionIndiaServer and browse it at MySubversionAmericaServer   -       OK
               modify a file in MySubversionAmericaServer and browse it at MySubversionIndiaServer   -       OK

       ALTERNATIVELY, SYNC CAN BE AUTOMATED USING CRON AND REMOVING POST COMMIT HOOK

Howto co from mirror and commit to master:

  Plan 1) (DROPPED)
       To get the UUID on the master machine:
               svnadmin dump -r0 /home/myname/svn/projects | head -n 3 > saved-uuid
       Copy the file saved-uuid to the mirror machine and do a
               svnadmin load --force-uuid /svnroot/MySubversionIndiaServer < saved-uuid
       On client:
               svn switch --relocate
       svn commit

  Plan 2) (IMPLEMENTED) WRITE THRU PROXY
       Use Apache(mod_proxy) and SVNMasterURI(available since SVN beta1)

       In MySubversionIndiaServer:
       Install & enable mod_proxy:
               cd /home/myname/svn/softwares/apache-2.2.6/bin
               ./apxs -c -i /home/myname/svn-install-scripts/httpd-2.2.6/modules/proxy/mod_proxy.c /home/myname/svn-install-scripts/httpd-2.2.6/modules/proxy/proxy_util.c
               ./apxs -c -i /home/myname/svn-install-scripts/httpd-2.2.6/modules/proxy/mod_proxy_http.c
               vi /home/myname/svn/softwares/apache-2.2.6/conf/httpd.conf
                       LoadModule proxy_module   modules/mod_proxy.so
                       LoadModule proxy_http_module   modules/mod_proxy_http.so

               vi /home/myname/svn/softwares/apache-2.2.6/conf/httpd.conf
                    #SVN 1.5 beta india
                       <Location /svn>
                       DAV svn
                       SVNPath /home/myname/svn/testproject
                       #SVNAutoversioning on
                       #ModMimeUsePathInfo on
                       AuthType Basic
                       AuthName "Subversion repository"
                       AuthUserFile
                       /home/myname/svn/softwares/apache-2.2.6/etc/svn-auth-file
                       Require valid-user
                       </Location>
                    #SVN 1.5 beta us for sync only
                       <Location /MySubversionAmericaServer>
                       DAV svn
                       SVNPath /home/myname/svn/MySubversionAmericaServer
                       Order deny,allow
                       Deny from all
                       Allow from MySubversionAmericaServer # or provide IP
                       #SVNAutoversioning on
                       #ModMimeUsePathInfo on
                       AuthType Basic
                       AuthName "Subversion repository"
                       AuthUserFile /home/myname/svn/softwares/apache-2.2.6/etc/svn-auth-file
                       Require valid-user
                       </Location>
                    #SVN 1.5 beta us synced for co only
                       <Location /CO-from-INDIA-CIN-to-AMERICA/>
                       DAV svn
                       SVNPath /home/myname/svn/MySubversionAmericaServer
                       SVNMasterURI http://MySubversionAmericaServer/svn/
                       #SVNAutoversioning on
                       #ModMimeUsePathInfo on
                       AuthType Basic
                       AuthName "Subversion repository"
                       AuthUserFile /home/myname/svn/softwares/apache-2.2.6/etc/svn-auth-file
                       Require valid-user
                       </Location>

       In MySubversionAmericaServer:
               cd /home/myname/apache-2.2.6/bin
               ./apxs -c -i /home/myname/svn-install-scripts/httpd-2.2.6/modules/proxy/mod_proxy.c /home/myname/svn-install-scripts/httpd-2.2.6/modules/proxy/proxy_util.c
               ./apxs -c -i /home/myname/svn-install-scripts/httpd-2.2.6/modules/proxy/mod_proxy_http.c
               vi /home/myname/apache-2.2.6/conf/httpd.conf
                       LoadModule proxy_module   modules/mod_proxy.so
                       LoadModule proxy_http_module   modules/mod_proxy_http.so
               vi /home/myname/apache-2.2.6/conf/httpd.conf
                    #SVN 1.5 beta us
                       <Location /svn>
                       DAV svn
                       SVNPath /svnroot/testproject
                       #SVNAutoversioning on
                       #ModMimeUsePathInfo on
                       AuthType Basic
                       AuthName "Subversion repository"
                       AuthUserFile /home/myname/apache-2.2.6/etc/svn-auth-file
                       Require valid-user
                       </Location>
                    #SVN 1.5 beta india for sync only
                       <Location /MySubversionIndiaServer>
                       DAV svn
                       SVNPath /svnroot/MySubversionIndiaServer
                       Order deny,allow
                       Deny from all
                       Allow from MySubversionIndiaServer # or provide IP
                       #SVNAutoversioning on
                       #ModMimeUsePathInfo on
                       AuthType Basic
                       AuthName "Subversion repository"
                       AuthUserFile /home/myname/apache-2.2.6/etc/svn-auth-file
                       Require valid-user
                       </Location>
                    #SVN 1.5 beta synced for co only
                       <Location /CO-from-AMERICA-CIN-to-INDIA/>
                       DAV svn
                       SVNPath /svnroot/MySubversionIndiaServer
                       SVNMasterURI http://MySubversionIndiaServer/svn/
                       #SVNAutoversioning on
                       #ModMimeUsePathInfo on
                       AuthType Basic
                       AuthName "Subversion repository"
                       AuthUserFile /home/myname/apache-2.2.6/etc/svn-auth-file
                       Require valid-user
                       </Location>

Errors & Resolutions

       Install errors and resolutions not covered here.

 1)    During svnsync usage
       Error:
               svnsync: PROPFIND of '/MySubversionAmericaServer': Could not resolve hostname `MySubversionIndiaServer'
       Resolution:
               ip instead of hostname

 2)
       SVNSYNC troubleshooting:
               Trouble shooting trailing slases in httpd.conf
               I tried Subversion 1.5 Beta1 WebDAV Write-Thru Proxies. Works fine for me.
               While compiling SVN 1.5, it complained about few thing(mostly related to Neon
               and Swig-Python).. which were resolved after I provided it with latest version of Neon and Swig.
               I tried a mirrored(svnsync) setup like:
               A -------------> a
               b <------------- B
               where A,B are masters and a,b are slaves. Later I tried
               checkout-from-mirror-checkin-to-master scenario.
               Works well. It gave me trailing slash related error.

               Resolution:
               In master httpd.conf no trailing slash in location directive:
               <Location /ABCD>
               In mirror httpd.conf has trailing slash in location directive:
               <Location /co-from-mirror-cin-to-master/>
               SVNMasterURI http://masterhost/ABCD/
               ..
               ..
               </Location>

               Complication of the above setup should be noted first.
               On checkout from mirror and checkin to master , this setup does the following.
               1) redirect to master
               2) cin to master
               3) sync to mirror (using svnsync in post-commit wrapper)
               Setup involves svnsync, location directive, SVNMasterURI. So this whole slash
               thing observation may not  be a actual problem at all. I may have gone wrong
               somewhere. Anyways.. as I said.. it was resolved with no further problem.

               master: noslash
               mirror: slash
               SVNMasterURI: slash
               =OK

               master: noslash
               mirror: slash
               SVNMasterURI: noslash
               =svn: Unusable URI: it does not refer to this repository

               master: noslash
               mirror: noslash
               SVNMasterURI: slash
               =svn: Server sent unexpected return value (405 Method Not Allowed) in response
               to PROPPATCH request for
               '/co-from-mirror-cin-to-master!svn/wbl/1e1fafe4-c5f4-48ba-93c3-05646e5b9087/3

               master: slash
               mirror: slash
               SVNMasterURI: slash
               =svnsync: Server sent unexpected return value (405 Method Not Allowed) in
               response to PROPFIND request for '/ABCD'

 3)    During cvsus --> MySubversionAmericaServer conversion using cvs2svn
       Error:
               '/home/myname/cvs/cvsroot/dummy/dummy.txt,v' is not a valid ,v file
       Resolution:
               It is an empty file(not required) and can be removed during conversion
               Checkout from mycvsserver says:
               cvs -d :pserver:praveen@mycvsserver:2401/cvsroot co dummy/dummy.txt
                       cvs server: warning: new-born dummy/dummy.txt
                       has disappeared
               cvs -d :pserver:praveen@mycvsserver:2401/cvsroot co dummy
                       cvs server: Updating
                       dummy
                       U
                       dummy/dummy.txt
                mv /home/myname/cvs/cvsroot/dummy/dummy.txt,v /tmp/junk/

       Error:
               It is not clear how the following symbols should be converted.
               Use --force-tag, --force-branch, --exclude, and/or --symbol-default to
               resolve the ambiguity.
                   'ABCDEF' is a tag in 11111 files, a branch in 111
               files and has commits in 222 files
                   'GEFGEF' is a tag in 333 files, a branch in 1111 files
               and has commits in 11 files
       Temporary Resolution:
               --symbol-default="heuristic"

       Error:
               Unable to convert a path
               'whatever.whatever'
               to internal encoding.
               Consider rerunning with one or more '--encoding' parameters or
               with '--fallback-encoding'.
       Resolution:
               --encoding=latin_1
               --encoding=utf_8
               --encoding=utf_7
               --encoding=utf_16
               --encoding=shift_jis
               --fallback-encoding=utf_8

 4)    After installing svn-python binding in MySubversionAmericaServer.. while executing
       python
       >>>import svn.repos
       Error:
               undefined symbol: gss_delete_sec_context
       Resolution:
               cd /home/myname/svn-install-scripts/subversion-1.5.0-beta1
               vi Makefile
                       #SVN_APR_LIBS =  /home/myname/apache-2.2.6/lib/libapr-1.la -luuid -lrt -lcrypt  -lpthread -ldl
                       SVN_APR_LIBS =  /home/myname/apache-2.2.6/lib/libapr-1.la -luuid -lrt -lcrypt  -lpthread -ldl -lgssapi
               ln -s /usr/lib/libgssapi.so.2.0.0 /usr/lib/libgssapi.so
               And make again.



WebSVN-2.0:

       Requires Apache with php-4.3+
       Hence use RHEL default httpd+php installation
       Verify php -v
       Install,
               cd /home/myname/svn/
               svn --username=guest co http://websvn.tigris.org/svn/websvn/tags/2.0/ websvn-2.0
                       Password: Hit enter
               cd websvn-2.0
       Edited httpd.conf and add proper host:port
               <VirtualHost MySubversionIndiaServer:8080>
                       ServerName MySubversionIndiaServer
                       DocumentRoot /home/myname/svn/websvn-2.0
                       SetEnv HTTP_PORT 8080
                       ErrorLog /var/log/httpd/error_log.websvn
               </VirtualHost>
       Do an Apache graceful
               /etc/init.d/httpd-new graceful
       Browse http://MySubversionIndiaServer/doc/install.html
               chmod -R 0755 /home/myname/svn/websvn-2.0/cache
               cd /home/myname/svn/websvn-2.0/
               mv include/distconfig.php include/config.php
       Edit include/config.php
       Browse http://MySubversionIndiaServer:8080/

gonzui:

       Install Ruby
               echo "Installing Ruby:"
               cd /home/myname/svn-install-scripts/
               #wget ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.6.tar.gz
               tar zxvf ruby-1.8.6.tar.gz
               cd ruby-1.8.6
               CFLAGS="-m32" ./configure
               make
               make install
       Install BDB
               echo "Installing bdb:"
               cd /home/myname/svn-install-scripts/
               #wget ftp://moulon.inra.fr/pub/ruby/bdb.tar.gz
               tar zxvf bdb.tar.gz
               cd bdb-0.6.2
               make distclean
               make clean
               ruby extconf.rb
               make
               make install
       Installing Gonzui
               echo "Installing gonzui:"
               cd /home/myname/svn-install-scripts/
               #wget http://nchc.dl.sourceforge.net/sourceforge/gonzui/gonzui-1.1.tar.gz
               tar zxvf gonzui-1.1.tar.gz
               cd gonzui-1.1
       If its a 32bit arch node:
                       CFLAGS="-m32"
                       ./configure
                       --prefix=/home/myname/svn/softwares/gonzui
       If its a 64bit arch node:
                       CFLAGS="-m64 -fPIC"
                       ./configure
                       --prefix=/home/myname/svn/softwares/gonzui
               make
               make install
       Gonzui post installation
               cd /home/myname/svn/softwares/gonzui/
               cp etc/gonzuirc.sample ~/.gonzuirc
       Edit ~/.gonzuirc
               :daemon                   => true,
               :http_port                => 8081,
               :site_title               => "My Repository - Code Search",
       TO ADD CVS REPOS:
               cd /home/myname/svn/softwares/gonzui/bin
               cvs -d :pserver:praveen@mycvsserver:/cvsroot login
               Example:
                       ./gonzui-import --cvs :pserver:praveen@mycvsserver:/cvsroot dummyproject
       TO ADD SVN REPOS:
               cd /home/myname/svn/softwares/gonzui/
               ./gonzui-import --svn http://MySubversionIndiaServer/svn/dummyproject dummyproject
       Run gonzui server
               ./gonzui-server
       Run svn updates to gonzui
               ./gonzui-update
       List whats in gonzui
               ./gonzui-db --list
       If added content is to be removed:
               ./gonzui-remove <>
       Set a cron to update repository changes to gonzui
               crontab -e
                       */1 * * * * /home/myname/svn/softwares/gonzui/bin/gonzui-update
       Add startup. Edit /etc/rc.local
               /home/myname/svn/softwares/gonzui/bin/gonzui-server

SELinux when enforced can make a lot of things not work. Features developed at
an server(SELinux disabled) may not work when it goes to production. SELinux controls
httpd (Apache) and I can list down few pointers for you.
Errors:

1. You see errors when you try creating a VirtualHost having its DocumentRoot on directories other than /var/www/html
2. You see errors when you try starting apache on non standard ports other than ones listed below
                           http_cache_port_t              tcp      3128, 8080, 8118
                           http_cache_port_t              udp      3130
                           http_port_t                        tcp      80, 443, 488, 8008, 8009, 8443
                           pegasus_http_port_t            tcp      5988
                           pegasus_https_port_t           tcp      5989
3. Your script does not execute if you are trying to run system files in it.
   Eg:
   You are trying to run /usr/bin/crontab, etc from php.

So.. what are we supposed to do? There are two possibilities.

• Disable selinux (refer SELINUX Restrictions On Apache). But kindly dont since it is not required.
• Or set SElinux to allow what you wan't
  

SELinux can be configured by setting selinux booleans and also by changing the context of the scripts. So.. what is this context? You will come to know below.

If SELINUX is not disabled.. we may have to look into

        cat /var/log/messages | grep SELinux

and later accordingly, allow selinux to relax restrictions on httpd.

Manual:
        man 8 httpd_selinux

Is SELinux enabled?
        dmesg | grep selinux
        cat /selinux/enforce

To see processes protected by selinux:
                ps -ZC httpd

For entire list
                ps -eZ

File attributes
                ls -Z /usr/bin/crontab
                       -rwxr-xr-x  root     root     system_u:object_r:bin_t          /usr/bin/crontab                Selinux prevents:
                        ls -Z /home/praveen/info.php
                        -rw-rw-r--  praveen  praveen  user_u:object_r:user_home_t     /home/praveen/test.php
                Selinux allows:
                        ls -Z /home/praveen/info.php
                                -rw-rw-r--  praveen  praveen  user_u:object_r:httpd_sys_content_t      /home/praveen/test.php

Types avaliable for apache
                getsebool -a | grep httpd

allow_httpd_anon_write --> off
allow_httpd_bugzilla_script_anon_write --> off
allow_httpd_mod_auth_pam --> off
allow_httpd_nagios_script_anon_write --> off
allow_httpd_squid_script_anon_write --> off
allow_httpd_sys_script_anon_write --> off
httpd_builtin_scripting --> on
httpd_can_network_connect --> off
httpd_can_network_connect_db --> off
httpd_can_network_relay --> off
httpd_disable_trans --> off
httpd_enable_cgi --> on
httpd_enable_ftp_server --> off
httpd_enable_homedirs --> on
httpd_rotatelogs_disable_trans --> off
httpd_ssi_exec --> off
httpd_suexec_disable_trans --> off
httpd_tty_comm --> off
httpd_unified --> on

List httpd ports
                semanage port -l | grep http
                        http_cache_port_t              tcp      3128, 8080, 8118
                        http_cache_port_t              udp      3130
                        http_port_t                    tcp      80, 443, 488, 8008, 8009, 8443
                        pegasus_http_port_t            tcp      5988
                        pegasus_https_port_t           tcp      5989

Add a httpd port to selinux
                Add it under httpd.conf
                        Listen 81
                Do a graceful.
               semanage port -a -t http_port_t -p tcp 81

audit2allow is a perl script that interprets the selinux errors and constructs the right rules to overcome various problems
                /usr/bin/audit2allow -i /var/log/messages
                sealert -l <id>
                        (id from /var/log/messages)

Change file context to make it accesible by httpd:
       chcon -h root:object_r:httpd_sys_content_t test.php

Sometimes restorecon -v test.php can work.

Recursively,
         restorecon -Rv <dir>

The below command will allow apache to access your directory(non default)
chcon -Rt httpd_sys_content_t <your document root dir>

The command below will allow apache to access user home directories as document root:
setsebool -P httpd_enable_homedirs=1

To use system commands thru php or other scripts on apache.. that command's context should be changed to httpd_unconfined_script_exec_t.
Eg:
chcon -t httpd_unconfined_script_exec_t /usr/bin/crontab

For other, undiscussed policy related errors:
        tail -f /var/log/messages | grep SELinux
        sealert -l <id>
will tell you what to do.

Last option will be to disable SELinux protection to apache by:
       setsebool -P httpd_disable_trans 1
       /etc/init.d/httpd restart

So disabling SELinux is not the solution if you have Apache issues.

If you want to control the maximum upload file size limit in php don't try doing it
thru script like:
  ini_set('UPLOAD_MAX_FILESIZE', <value>);
  ini_set('POST_MAX_SIZE', <value>);
Instead set the values in php.ini like:
  upload_max_filesize = 256M ;(it is 2M by default)
  post_max_size = 256M
Do a httpd graceful. It should work.

cd /etc/yum.repos.d/
In CentOS-Base.repo change enabled=1 for centosplus
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4
yum -y install reiserfs-utils.x86_64
yum -y install kernel-smp.x86_64 kernel-smp-devel.x86_64
Set default kernel to be loaded as 2.6.9-55.0.6.plus.c4smp
vi /etc/grub.conf

        default=0
        timeout=5
        splashimage=(hd0,0)/boot/grub/splash.xpm.gz
        hiddenmenu
        title CentOS (2.6.9-55.0.6.plus.c4smp)

Comment the mount which needs to be chaged from ext3 to reiserfs
Edit /etc/fstab

#LABEL=/home             /home                   ext3    defaults        1 2

reboot

mkfs.reiserfs /dev/sda3 --label=/home -d
mount /dev/sda3 /home

Edit /etc/fstab

LABEL=/home             /home                   reiserfs    defaults        1 2

Thats all!

Common errors, its context and its resolution(fix,dirtyfix):

---

Error:
rsync: recv_generator: mkdir "" failed: Too many links (31)
rsync: stat "" failed: No such file or directory (2)
rsync: mkstemp ".MXiMwF" failed: No such file or directory (2)
Resolution:
Go for reiserfs or gfs or comply with ext3 subdirectories limitation

---

Context:
svnsync (reversal)
Error:
svnsync: PROPFIND of '/mysvn': Could not resolve hostname `myhost'
Resolution:
ip instead of hostname

---

Context:
svn-python
>>>import svn.repos
Error:
undefined symbol: gss_delete_sec_context
Resolution:
Edit Makefile
#SVN_APR_LIBS =  path-to-apache-x.x.x/lib/libapr-x.la -luuid -lrt -lcrypt  -lpthread -ldl
SVN_APR_LIBS =  path-to-apache-x.x.x/lib/libapr-1.la -luuid -lrt -lcrypt  -lpthread -ldl -lgssapi
ln -s /usr/lib/libgssapi.so.x.x.x /usr/lib/libgssapi.so
And make again.

---

Context:
svnsync (reversal)
Error:
svnsync: PROPFIND of '/mysvn': Could not resolve hostname `myhost'
Resolution:
ip instead of hostname

---

Context:
MIME-tools: /usr/bin/perl -MCPAN -e 'install MIME::Parser'
Error:
No IO::File
Undefined subroutine &Mail::Internet::mailaddress
Resolution:
cpan> install IO::File
cpan> force install MIME::Parser

---

Context:
Chart: /usr/bin/perl -MCPAN -e 'install Chart::Base'
Error:
The module Chart::Base isn't available on CPAN
Resolution:
wget http://search.cpan.org/CPAN/authors/id/C/CH/CHARTGRP/Chart-2.4.1.tar.gz
tar zxvf Chart-2.4.1.tar.gz
cd Chart-2.4.1
perl Makefile.PL
make
make test
make install

---

Error:
Starting httpd: Warning: DocumentRoot [path-to-bugzilla] does not exist
Forbidden
You don't have permission to access /README on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an
ErrorDocument to handle the request.
Resolution:
sestatus
cat /selinux/enforce
echo 0 >/selinux/enforce
newrole -r sysadm_r
cat /selinux/enforce
vi /etc/selinux/config
    SELINUX=disabled
reboot

---

Context:
mysqlhotcopy -u <user> -p <pass> <bd> --debug
Error:
Using copy suffix '_
Filtering tables with '(?-xism:.*)'
Invalid db.table name 'db.table`.`field' at
path-to/mysqlhotcopy line 855.
Dirty fix:
Added a new line
vi path-to/mysqlhotcopy
:836
map { s/^.*?.//o } @dbh_tables;

---

Context:
mysqlhotcopy -u <user> -p <pass> <bd> --debug --addtodest
Error:
DBD::mysql::db do failed: Access denied; you need the RELOAD privilege for
this operation at path-to/mysqlhotcopy line 473.
Resolution:
mysql>
GRANT RELOAD ON *.* TO user@localhost; FLUSH PRIVILEGES;

---

Context:
Can't connect to the database.
Error:
Too many connections
Is your database installed and up and running?
Do you have the correct username and password selected in localconfig?