was tested with Ubuntu Server 10.04.1 LTS is currently updated for Ubuntu Server 12.04 and SQL-Ledger Version 3. It shows how to set up a simple SQL-Ledger server that runs in a local network. For servers available in the Internet, additional security measures are required.
First you have to download the ISO file of the operating system. Go to the Ubuntu homepage and download, according to your needs, Ubuntu 12.04 LTS in the 32 or in the 64 bit version.
You can install Linux either on 'real' hardware or in a virtual machine running on your computer.
Existing hardware To be able to install the operating system, you have to burn the downloaded ISO-file to a CD. Don't copy the file to the CD, choose the ISO burn function in your burning software.
To create a virtual server, you can use for example Virtualbox that you get here.
Start Virtualbox, click “New”, give your machine the name “SQL-Ledger” and choose Linux and Ubuntu for operating system. You don't need much memory, 256 - 512 MB are enough. For the virtual hard disk, use the default settings, just press
finish until your disk and server are created.
Before you start, you have to change the network settings. Open the network adapter and change it to “Bridged Adapter”.
Now you can turn the machine on. The First Run Wizard appears and asks for the installation media. Show him the previously downloaded ISO file.
Turn on your computer with the Linux CD in the drive or the virtual machine with the ISO file connected.
Wait some minutes until the basic installation is finished.
Now the system restarts.
Login to the server with your user name and password. To be able to install the software, we have to change to the “root” account. In this way, we get administrator rights. Type:
and enter your password. With the following command, we install the packages we need for SQL-Ledger:
apt-get install ssh acpid apache2 postgresql libdbi-perl libdbd-pg-perl git-core gitweb postfix mailutils texlive
The installation needs some time. While installing postfix (the mail server), the system asks you about the mail configuration.
If you use another language than English, you may want to install an additional package that supports hyphenation in your language, for example
apt-get install texlive-lang-german
You get a list of all available language packs with:
apt-cache search texlive-lang
Or, if you know from beginning that you will use several different languages or special LaTeX functions, install the complete package:
apt-get install texlive-full
We will install SQL-Ledger in the folder /usr/local/sql-ledger. For this, we change to /usr/local:
To install the original SQL-Ledger, type:
git clone git://github.com/Tekki/sql-ledger.git
Because of a security leak , the template editor is disabled in the above repository. It is recommended not to use the master, but the full branch:
cd /usr/local/sql-ledger git checkout -b full origin/full
The full branch contains some additional features like WLprinter (see below) or an extended admin interface.
For the Ledger123 type:
git clone git://github.com/ledger123/ledger123.git sql-ledger
Next, you have to create a spool directory, change the access rights to some files and folders and copy sql-ledger.conf.default to sql-ledger.conf.
cd /usr/local/sql-ledger mkdir spool chown -hR www-data.www-data users templates css spool cp sql-ledger.conf.default sql-ledger.conf
If the remote repositories changed, you update your installation with
cd /usr/local/sql-ledger git pull
In the full branch of the original SQL-Ledger, you have the possibility to update the software using the Software Administration function in the Admin interface. Before it works, you have to give the web server the right to call the git commands. For this, type
Then add the following line to the user privilege section:
www-data ALL=(ALL) NOPASSWD: /usr/bin/git
CUPS is the printing system for Linux. You have to install it if the SQL-Ledger server should be able to print to printers in your network.
apt-get install cups hplip hpijs cupsys-driver-gutenprint cupsctl --remote-admin
Now you can call from your browser the CUPS web interface at
and add your printer. Remember the name you give to your printer. Then open sql-ledger.conf
and move to “# available printers”. There you see an example of two printers. Replace them with your own printer or printers. The name on the left side is the name you will see in SQL-Ledger, the one on the right side immediately after -P is the name by which the printer is known to the operating system.
WLprinter is a program that allows to print from SQL-Ledger directly and without further installation or configuration to printers connected to client computers. On the client side, it requires Java and on Windows machines Adobe Reader. After the installation, SQL-Ledger automatically provides an additional printer “WLprinter”.
WLprinter is part of the full branch. If you followed the above instructions, this program already installed on your server. It is recommended that you copy the config file wlprinter.conf.default to wlprinter.conf, so you can edit it:
cp wlprinter.conf.default wlprinter.conf
WLprinter isn't available for Ledger123.
If you didn't add printers with CUPS and edit sql-ledger.conf before, open it now with
and change the printer definition to
%printer = ( );
Edit the Postgresql database configuration.
Change the line
local all all peer
local all all trust
Restart the database
service postgresql-9.1 restart
Create a user for SQL-Ledger
su postgres -c "createuser -d -S -R sql-ledger"
Your web server has to know where to find SQL-Ledger. We add a new configuration file and restart the server.
cd /etc/apache2/sites-available/ wget https://raw.github.com/Tekki/sql-ledger/full/doc/sql-ledger.httpd.conf cd ../sites-enabled/ ln -s ../sites-available/sql-ledger.httpd.conf 001-sql-ledger service apache2 restart
It should now be possible to access SQL-Ledger. As you didn't specify an address for your server, it was received from DHCP. Enter the following command:
You see the address after “inet addr:”. In a private network, it will be something starting with “192.168…”. Open your web browser, enter this address followed by “/sql-ledger”. The SQL-Ledger login screen has to appear.
There are some additional components that make working with the SQL-Ledger server more comfortable.
Samba is a file server for Windows PCs. If you install it, you are able to connect to the server with its name instead of the IP address from your Windows computer.
apt-get install samba If you followed our example and work on Windows, you can click on the following link to connect to your server:
If you chose another name, use
SQL-Ledger can use different printers to print its documents. If you want print to shared printers connected to Windows workstations, install:
apt-get install samba-client Linux probably has no driver for your Windows printer. In this case use WLprinter.
Webmin is a web based administration interface for Linux. It is very convenient for a lot of administration tasks.
cd /tmp wget http://www.webmin.com/download/deb/webmin-current.deb apt-get install libapt-pkg-perl apt-show-versions libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl dpkg --install webmin-current.deb
If you have installed the Samba server, Webmin is now available at
The Webmin server needs some instants (10 seconds or more) to start up. Just wait until the login screen appears and log in with your Linux user name and password.
In the default configuration, your server gets its IP address dynamically via DHCP. This address may change from time to time. You probably want to give it a fixed address, so you can access it always in the same way.
If you open the config file with
it looks like this:
# The primary network interface auto eth0 iface eth0 inet dhcp
If you want to give your server the fixed address 192.168.1.10 and your internet router has the address 192.168.1.1, you have to change the file the following way:
iface eth0 inet static address 192.168.1.10 netmask 255.255.255.0 broadcast 192.168.1.255 network 192.168.1.0 gateway 192.168.1.1
With this change, the server looses the possibility to configure the name servers automatically. Many routers work as name servers, so in most cases it's enough to type:
echo "nameserver 192.168.1.1" > /etc/resolv.conf
After that, restart the network services with
service networking restart
If you installed Webmin, you can make these changes in the Networking–Network Configuration tab.