Assorted Linux/Ubuntu Gotchas!!

To customise Vi Editor
copy /usr/share/vim/vimrc to ~/.vimrc
:syntax on for color highlighting
:set incsearch for incremental search in vi editor

to clear and redraw the screen ^L


To get network info
$netstat -lneap | grep tcp
5900 for vnc
21 for ftp

To mount Windows partitions (NTFS) on boot-up, and allow users read and write access

$sudo apt-get install ntfs-3g

$sudo vi /etc/fstab and add the following

/dev/hda5 /media/windows ntfs-3g defaults,locale=en_US.utf8 0 0

To mount network folder
//192.168.151.97/freeware /media/freesoft smbfs credentials=/root/.smbcredentials 0 0

To list all ips in a network
nmap -v -sP 192.168.185.1/24 | grep "appears to be up" | cut -d ' ' -f 2

Install FLash editor for linux
$wget http://www.sonsuzdongu.com/paketler/f4lm_0.1-1_i386.deb

$sudo dpkg -i f4lm_0.1-1_i386.deb


Postgresql

If you want to allow other(s) network system to access your
database, you need to make changes in two files : postgresql.conf and
pg_hba.conf.

in postgresql.conf file you need to specify IP address(es) to listen on,
with comma seperated. OR '*' for ALL.

listen_addresses = '*'
And in pg_hba.conf you need to add the following line at end :
host all all 192.168.185.1/8 trust

Java 5 doc
$wget http://javadocs.planetmirror.com/dist/jdk150-hh.zip

Setting up a SVN 1.4 server using Apache 2.2

To setup svn 1.4 , we need to compile both apache 2.2 and svn 1.4 from source.
This how to has been tested under Ubuntu Dapper and Edgy.

$sudo apt-get install build-essential libneon25-dev autoconf libtool -y --force-yes

Before starting make sure you have removed prev apache2 and subversion from your system.
To do this:
$sudo apt-get --purge remove apache2 subversion
$sudo mv /etc/init.d/apache2 $HOME/apache2_bak


$cd $HOME
$mkdir softwares
$cd softwares

$wget http://www.zlib.net/zlib-1.2.3.tar.gz
$tar xvfz zlib-1.2.3.tar.gz
$cd zlib-1.2.3/
$./configure --prefix=/usr/local
$make
$sudo make install

$cd ..
$wget http://apache.forbigweb.com/httpd/httpd-2.2.3.tar.gz

$tar xvfz httpd-2.2.3.tar.gz
$cd httpd-2.2.3/
$./buildconf

$./configure --prefix=/usr/local/apache2 --enable-mods-shared=all --enable-deflate --enable-proxy --enable-proxy-balancer --enable-proxy-http --enable-dav --enable-so --enable-maintainer-mode


$make
$sudo make install

$sudo /usr/local/apache2/bin/apachectl start
Now test your apache2! goto browser and type http://localhost, you should see it works!!


$sudo /usr/local/apache2/bin/apachectl stop


$sudo cp /usr/local/apache2/bin/apachectl /etc/init.d/apachectl
$sudo chmod +x /etc/init.d/apachectl

We just need to add a few lines to the file for it to work nicely:

$sudo vi /etc/init.d/apachectl

Add the followinig, so the top of the file looks like:

#!/bin/sh
#
# chkconfig: - 85 15
# description: Apache is a web server.
Save the file.

$sudo /usr/sbin/update-rc.d apachectl defaults

Securing Apache

It?s also a good idea to create a dedicate Apache system user account. It?ll make your install much more secure.

$sudo adduser --system apache

Now we just need to make sure that Apache runs under this user. We do that by editting the configuration file:

$sudo vi /usr/local/apache2/conf/httpd.conf

You need to find the lines that say:

User daemon
Group daemon

And change them so they look like:

User apache
Group nogroup

$sudo /usr/local/apache2/bin/apachectl start


Installing Subversion 1.4

As we have built Apache from source, we'll need to do the same for Subversion in order to get the Apache 2 modules mod_dav_svn and mod_authz_svn.

# rm -f /usr/local/lib/libsvn*
# rm -f /usr/local/lib/libapr*
# rm -f /usr/local/lib/libexpat*
# rm -f /usr/local/lib/libneon*

$wget http://subversion.tigris.org/downloads/subversion-1.4.0.tar.gz
$tar xvfz subversion-1.4.0.tar.gz
$cd subversion-1.4.0/

$sh autogen.sh

$./configure --prefix=/usr/local --with-apxs=/usr/local/apache2/bin/apxs --with-httpd

In case you find a error for missing apr or apr tool give the following configure command

$./configure --prefix=/usr/local --with-apxs=/usr/local/apache2/bin/apxs --with-httpd --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr

$make
$sudo make install

This will also add the relevant LoadModule directives into your Apache 2 configuration for you.
Creating your repository

Now, create your Subversion repository:

$svnadmin create /home/yourusername/subversion/repos

We have to make that repository owned by Apache so that it can be accessed via the web:

$sudo chown -R apache /home/yourusername/subversion/repos

Authentication File

Now create a user/password file for authentication:

$/usr/local/apache2/bin/htpasswd -cm /home/yourusername/subversion/dav_svn.passwd yourusername

When prompted, enter your password.
Configuring Apache

Edit your /usr/local/apache2/conf/httpd.conf file with the following placed at the end:



<Location /svn>
DAV svn
SVNPath /home/yourusername/subversion/repos

AuthType Basic
AuthName "Subversion Repository"
AuthUserFile /home/yourusername/subversion/dav_svn.passwd
Require valid-user
</Location>




If you want access control based on different users, add the following line after the Require valid-user line:

AuthzSVNAccessFile /home/yourusername/subversion/svn_access_control


To setup a local mirror using svnsync

$cd /home/ajopaul/subversion/repos/hooks/
$vi pre-revprop-change
$sudo vi pre-revprop-change
Add the following lines
#!/bin/sh
USER="$3"

if [ "$USER" = "svnsync" ]; then exit 0; fi

echo "Only svnsync user can change revprops" >&2
exit 1


$sudo chmod +x pre-revprop-change

$sudo svnsync init --username svnsync file:///home/ajopaul/subversion/repos http://xxx.xxx.xxx.xxx/svn

$sudo svn proplist --revprop -r 0 http://xxx.xxx.xxx.xxx/svn

$sudo svn propget file:///home/ajopaul/subversion/repos --revprop -r 0 http://xxx.xxx.xxx.xxx/svn

$time sudo svnsync sync file:///home/ajopaul/subversion/repos

Remember! local mirrors is/should be read only

To ensure no commits happen on the local mirror add the following lines to hooks/pre-commit script

#!/bin/sh
SVNLOOK=/usr/local/bin/svnlook
USER=`$SVNLOOK author -t $2 $1`
if [ "$USER" = "svnsync" ]; then
exit 0;
fi
echo "Sorry no commit allowed on mirror! use 'svn switch' to point to master repo and then point back to local mirror after the commit" >&2
exit 1



-Ajo Paul

Source:
Apache 2.2
Svn 1.4