Find your most sized files

It is very easy with 'find' unix tool:

$ find / -size +100000k -exec ls -lh '{}' \;

Hard disk benchmark

HD benchmarking is easy with bonnie++

# apt-get install bonnie
# mkdir /store/bench
# chown randradas:randradas /store/bench & chmod 755 /store/bench
# bonnie++ -d /store/bench -s 6600 -x 5 -u randradas:randradas -q -f 2>&1 | tee bonnie++.LOG &

Change 6600 to two times your ram to get a good result.

Forwarding proxy with Apache

Edit prx.confwith the next Apache directives and adapt it to your port and directory requirements:

LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so
LoadModule authz_host_module /usr/lib/apache2/modules/mod_authz_host.so

Listen 8887

ProxyRequests On
#put < and > to the next directive
 Proxy *
   Order Deny,Allow
   Deny from all 
   Allow from 10.0.0.0/24
#put < and > to the next directive
 /Proxy

LogLevel warn
CustomLog /home/randradas/prx/access.log combined
ErrorLog /home/randradas/prx/error.log
PidFile /home/randradas/prx/apache.pid

Run the proxy with as normal user:

$ /usr/sbin/apache2 -f prx.conf

And then connect to the proxy from your http client, the server is listening in the 8887 port.

Resize Xen disk image

losetup -f
losetup /dev/loop0 disk.img
e2fsck -f /dev/loop0
resize2fs /dev/loop0 6G
   resize2fs 1.40-WIP (14-Nov-2006)
   Resizing the filesystem on /dev/loop0 to 1572864 (4k) blocks.
   The filesystem on /dev/loop0 is now 1572864 blocks long.
e2fsck -f /dev/loop0
losetup -d /dev/loop0

losetup /dev/loop0 disk.img
fsck -n /dev/loop0
fsck 1.40-WIP (14-Nov-2006)
e2fsck 1.40-WIP (14-Nov-2006)
/dev/loop0: clean, 112769/786432 files, 458389/1572864 blocks
eddard:/xens/domains/beta.osor.eu# tune2fs -O ^has_journal /dev/loop0
tune2fs 1.40-WIP (14-Nov-2006)
eddard:/xens/domains/beta.osor.eu# e2fsck -f /dev/loop0
   e2fsck 1.40-WIP (14-Nov-2006)
   Pass 1: Checking inodes, blocks, and sizes
   Pass 2: Checking directory structure
   Pass 3: Checking directory connectivity
   Pass 4: Checking reference counts
   Pass 5: Checking group summary information
   /dev/loop0: 112769/786432 files (0.6% non-contiguous), 425587/1572864 blocks

For example, to create a 2GB sparse file-backed virtual block device (actually only consumes 1KB of disk):

    # dd if=/dev/zero of=vm1disk bs=1k seek=2048k count=1 

Make a file system in the disk file:

    # mkfs -t ext3 vm1disk 

(when the tool asks for confirmation, answer `y')

Populate the file system e.g. by copying from the current root:

# mount -o loop vm1disk /mnt
# cp -ax /{root,dev,var,etc,usr,bin,sbin,lib} /mnt
# mkdir /mnt/{proc,sys,home,tmp}

Tailor the file system by editing /etc/fstab, /etc/hostname, etc. Don't forget to edit the files in the mounted file system, instead of your domain 0 filesystem, e.g. you would edit /mnt/etc/fstab instead of /etc/fstab. For this example put /dev/sda1 to root in fstab.

Now unmount (this is important!):

    # umount /mnt 

In the configuration file set:

    disk = ['file:/full/path/to/vm1disk,sda1,w'] 

Export X11

Scenario: Mac OS X (nieve)/server, Debian Etch (stark)/client
Objetive: Run a X application in my Mac OS

• Run X11 in Mac OS


• Open a terminal:



nieve:~$ xhost +stark_ip    (this step allows your client to connec to your server)
nieve:~$ ssh -X randradas@stark_ip
 ..
 ..
 Welcome to stark
 ..
stark:~$ export DISPLAY=nieve_ip:0.0
stark:~$ evolution &

Now you have Evolution running in your X11 server.

Apache2+SSL+SVN

# apt-get install apache2 openssl ssl-cert
# mkdir /etc/apache2/ssl
# make-ssl-cert /usr/share/ssl-cert/ssleay.cnf /etc/apache2/ssl/apache2.pem
# chmod 600 /etc/apache2/ssl/apache.pem
# cd /etc/apache2/sites-available/
# cp default ssl
# a2ensite ssl
# a2enmod ssl
# vim /etc/apache2/ports.conf
   ..
   Listen 443
   ..
# vim /etc/apache2/sites-available/svn
   ..
   NameVirtualHost *:443
   VirtualHost *:443
      SSLEngine On
      SSLCertificateFile /etc/apache2/ssl/apache.pem
      ..
   VirtualHost

# /etc/init.d/apache2 restart

At this point you have an Apache server with SSL. Follow the next commands in order to integrate svn with Apache+SLL

# cd /
# mkdir /svnroot
# chown www-data /svnroot/
# su www-data -c "svnadmin create /svnroot/repository"
# su www-data -c "htpasswd -c -m /svnroot/.dav_svn.passwd testuser"
  ..
  ..
# vim /etc/apache2/sites-available/svn
  ..   
  Location /svn
       DAV svn
       SVNParentPath /svnroot/
       AuthType Basic
       AuthName "LibreForge Subversion Repository"
       AuthUserFile /svnroot/.dav_svn.passwd
       Require valid-user
  Location
  ..
# /etc/init.d/apache2 restart

Now you can use your repository with the testuser created recently:

$ svn co https://your.domain.tld/svn/repository
$ cd repository
$ touch testfile
$ svn add testfile
$ svn ci -m "restfile added"

Or see your repository through https, https://your.domain.tld/svn/repository

Google hack

You can search indexed directories with Google using the next chain:

-inurl:(htm|html|php) intitle:"index of" +"last modified" \
+"parent directory" +description +size +(avi|mpg) "Kickboxer"