When you reorganize the structure of a website, you might want to redirect requests to files in a old folder to a new one without loosing the pagerank. In this example, I will redirect all requests from directory "olddir" to directory "newdir", so that requests like http://www.yourdomain.tld/olddir/page.htm get redirected to http://www.yourdomain.tld/newdir/page.htm without loosing the Google pagerank of the pages.
The following rewrite rules can be added into a .htaccess file in the website directory or in the vhost configuration.
RewriteRule ^olddir/(.*)$ newdir/$1 [R=301,L]
This rewrite rule redirects automatically all requests to pages or subdirectorys of "olddir" to the same page or subdirectory in "newdir".
Runing a nightly backup script on a server system like a webhosting server can produce high load and longer latencys for other processes, e.g. HTML or .php pages load slow during backup because the backup script takes too much I/O or CPU resources.
On Linux systems there are two shell utilitys available to set the I/O and CPU Scheduling for a appliaction or script. The utilitys are named nice and ionice.
Reduce the I/O priority of the script "/usr/local/bin/backup.sh" so that it does not disrupt other processes:
/usr/bin/ionice -c2 -n7 /usr/local/bin/backup.sh
The -n parameter must be between 0 and 7, where lower numbers mean higher priority.
To reduce the CPU priority, use the command nice:
/usr/bin/nice -n 19 /usr/local/bin/backup.sh
The -n parameter can range from -20 to 19, where lower numbers mean higher priority
Nice and ionice can also be combined, to run a script at low I/O and CPU priority:
/usr/bin/nice -n 19 /usr/bin/ionice -c2 -n7 /usr/local/bin/backup.sh
If you want to set the time in a OpenVZ Guest automatically, execute the following command on the host system:
vzctl set 101 --capability sys_time:on --save
and restart the guest system:
vzctl restart 101
101 is the ID of the container and has to be changed to match the ID of your OpenVZ VM.
Thanks to PlanetFox for this FAQ.
Linux user quotas can be edited with the commands edquota or setquota on the shell. While edquota opens the quota settings in a editor like vim, setquota allows you to specify the quota settings on the commandline.
Example for disabling the quota for the user "testuser":
setquota -u testuser 0 0 0 0 -a
Example for disabling quota for the group "testgroup":
setquota -g testgroup 0 0 0 0 -a
When you copy files from a older Linux or Windows system to a new Linux system, the filenames can get broken and have to be converted. Handy tool to translate the charset of filenames is convmv.
convmv -f iso-8859-15 -t utf8 -r /var/www/myhome.lan/web/images/*
Your Perl version has fleas #37757 #49830
Starting a dry run without changes...
mv "/var/www/var/www/myhome.lan/web/images/gr▒n.jpg" "var/www/myhome.lan/web/images/web/images/grün.jpg"
To finally execute the command (not dry run), use the --notest option:
convmv --notest -f iso-8859-15 -t utf8 -r /var/www/myhome.lan/web/images/*
Thanks to PlanetFox for this FAQ.
The following guide explains the installation of the apache module "mod_evasive". Mod_evasive tracks the number of requests of files at the apache webserver and blocks the delivery in case that a certain limit has been reached.
apt-get install libapache2-mod-evasive
Create the log directory for mod_evasive
mkdir -p /var/log/apache2/evasive
chown -R www-data:root /var/log/apache2/evasive
Now we add the configuration for the module at the end of the file /etc/apache2/mods-available/mod-evasive.load
so that it looks like this:
LoadModule evasive20_module /usr/lib/apache2/modules/mod_evasive20.so
and restart apache:
To change the language of the website statistics generated by AWStats on a Debian Linux server to e.g. german (de), edit the /etc/awstats/awstats.conf file:
and change the value of the "Lang" variable. To change the languge to e.g. German, cahnge:
The website statistics are generated nightly on a ISPConfig 3 server, so it may take up to 24 hours until the statistics will show up in German language.
Thanks to PlaNet Fox for this FAQ.
wrote by Rafael Marangoni, from Suporte Linux team.
This article explains how to change the default PostgreSQL Locale. Be careful, because we're considering that you do not have data on postgresql instance.
First, we need to stop the postgres service (if was not already stopped):
Then we need to remove all data files from postgresql data dir. On RedHat based, that's the dir:
rm -rf /var/lib/pgsql/data/*
Now we change to postgres user:
Creating the initial data, selecting the Locale:
initdb --locale=C /var/lib/pgsql/data
initdb --locale=pt_BR.UTF-8 /var/lib/pgsql/data
or your locale
Then, we start postgres service:
wrote by Rafael Marangoni, from BR Link team.
By default, the ssh login is disabled on VMware ESXi, in opposite way what it happens on VMware ESX Server.
But, there’s a way to enable SSH Login.
After the system is installed, go to the console screen and type:
ALT + F1
After that, a Black screen will appear (be calm, that is normal), then type:
Next, the Server will prompt for root password. Then you type the root password.
Afterwards, you’ll have shell access. We need to edit the following file:
Uncomment the line that starts with “SSH”. Save the file (it’s a normal vi, ZZ will do that for you).
Now reboot the server:
After it reboots, you should login with SSH on port TCP/22, and user root.
wrote by Rafael Marangoni, from Servidor Linux team.
This article explains howto update the Samba packages on CentOS 5 to version 3.5.
First, we need to add a new repository:
Then, update samba:
yum update samba
Probably, you will need winbind too:
yum install samba3-winbind samba3-utils
Check the rpm version:
rpm -qa | grep samba