The Installation of OpenERP¶
Whether you are from a small company investigating how OpenERP works, or you are part of the IT staff of a larger organization and have been asked to assess OpenERP's capabilities, your first requirement is to install it or to find a working installation.
The table below summarizes the various installation methods that will be described in the following sections.
Level of Complexity
Very useful for quick evaluations because no need to install anything.
All-in-one Windows Installer
A few minutes
Very useful for quick evaluations because it installs all of the components pre-configured on one computer (using the GTK client).
Independent installation on Windows
Half an hour
Enables you to install the components on different computers. Can be put into production use.
Ubuntu Linux packages
A few minutes
Simple and quick but the Ubuntu packages are not always up to date.
From source, for all Linux systems
More than half an hour
Medium to slightly difficult
This is the method recommended for production environments because it is easy to keep it up to date.
Each time a new release of OpenERP is made, OpenERP supplies a complete Windows auto-installer for it. This contains all of the components you need – the PostgreSQL database server, the OpenERP application server and the GTK application client.
This auto-installer enables you to install the whole system in just a few mouse clicks. The initial configuration is set up during installation, making it possible to start using it very quickly as long as you do not want to change the underlying code. It is aimed at the installation of everything on a single PC, but you can later connect GTK clients from other PCs, Macs and Linux boxes to it as well.
The first step is to download the OpenERP installer. At this stage you must choose which version to install – the stable version or the development version. If you are planning to put it straight into production we strongly advise you to choose the stable version.
Stable Versions and Development Versions
OpenERP development proceeds in two parallel tracks: stable versions and development versions.
New functionality is integrated into the development branch. This branch is more advanced than the stable branch, but it can contain undiscovered and unfixed faults. A new development release is made every month or so, and OpenERP has made the code repository available so you can download the very latest revisions if you want.
The stable branch is designed for production environments. Releases of new functionality there are made only about once a year after a long period of testing and validation. Only bug fixes are released through the year on the stable branch.
To download the version of OpenERP for Windows, follow these steps:
Navigate to the site http://openerp.com.
Click the Downloads button at the right, then, under Windows Auto-Installer, select All-in-One.
This brings up the demonstration version Windows installer, currently openerp-allinone-setup-6.0.0.
Save the file on your PC - it is quite a substantial size because it downloads everything including the PostgreSQL database system, so it will take some time.
To install OpenERP and its database, you must be signed in as an Administrator on your PC. Double- click the installer file to install it and accept the default parameters on each dialog box as you go.
If you had previously tried to install the all-in-one version of OpenERP, you will have to uninstall that first, because various elements of a previous installation could interfere with your new installation. Make sure that all Tiny ERP, OpenERP and PostgreSQL applications are removed: you are likely to have to restart your PC to finish removing all traces of them.
The OpenERP client can be opened, ready to use the OpenERP system, once you have completed the all-in-one installation. The next step consists of setting up the database, and is covered in the final section of this chapter Creating the Database.
Independent Installation on Windows¶
System administrators can have very good reasons for wanting to install the various components of a Windows installation separately. For example, your company may not support the version of PostgreSQL or Python that is installed automatically, or you may already have PostgreSQL installed on the server you are using, or you may want to install the database server and application server on separate hardware units.
For this situation, you can get a separate installer for the OpenERP server from the same location as the all-in-one auto-installer. You will also have to download and install a suitable version of PostgreSQL independently.
You must install PostgreSQL before the OpenERP server, and you must also set it up with a user and password so that the OpenERP server can connect to it. OpenERP's web-based documentation gives full and current details.
Connecting Users on Other PCs to the OpenERP Server¶
To connect other computers to the OpenERP server, you must set the server up so that it is visible to the other PCs, and install a GTK client on each of those PCs:
Make your OpenERP server visible to other PCs by opening the Windows Firewall in the Control Panel, then ask the firewall to make an exception of the OpenERP server. In the Exceptions tab of Windows Firewall click Add a program... and choose OpenERP Server in the list provided. This step enables other computers to see the OpenERP application on this server.
Install the OpenERP client (openerp-client-6.X.exe), which you can download in the same way as you downloaded the other OpenERP software, onto the other PCs.
You must make sure that the version of the client matches that of the server. The version number is given as part of the name of the downloaded file. Although it is possible that some different revisions of client and server will function together, there is no certainty about that.
To run the client installer on every other PC you will need to have administrator rights there. The installation is automated, so you just need follow the different installation steps.
To test your installation, start by connecting through the OpenERP client on the server machine while you are still logged in as administrator.
Why sign in as a PC Administrator?
You would not usually be signed in as a PC administrator when you are just running the OpenERP client, but if there have been problems in the installation it is easier to remain as an administrator after the installation so that you can make any necessary fixes than to switch users as you alternate between roles as a tester and a software installer.
Start the GTK client on the server through the Windows Start menu there. The main client window appears, identifying the server you are connected to (which is localhost – your own server PC – by default). If the message No database found, you must create one appears then you have successfully connected to an OpenERP server containing, as yet, no databases.
In its default configuration at the time of writing, the OpenERP client connects to port 8069 on the server using the XML-RPC protocol (from Linux) or port 8070 using the NET-RPC protocol instead (from Windows). You can use any protocol from either operating system. NET-RPC is quite a bit quicker, although you may not notice that on the GTK client in normal use. OpenERP can run XML-RPC, but not NET-RPC, as a secure connection.
Resolving Errors with a Windows Installation¶
If you cannot get OpenERP to work after installing your Windows system you will find some ideas for resolving this below:
Is the OpenERP Server working? Signed in to the server as an administrator, stop and restart the service using Stop Service and Start Service from the menu Start ‣ Programs ‣ OpenERP Server .
Is the OpenERP Server set up correctly? Signed in to the server as Administrator, open the file openerp-server.conf in C:\Program Files\OpenERP AllInOne and check its content. This file is generated during installation with information derived from the database. If you see something strange it is best to entirely reinstall the server from the demonstration installer rather than try to work out what is happening.
Is your PostgreSQL running? Signed in as administrator, select Stop Service from the menu Start ‣ Programs ‣ PostgreSQL. If after a couple of seconds, you read The PostgreSQL4OpenERP service has stopped then you can be reasonably sure that the database server was working. Restart PostgreSQL.
Is the database accessible? Still in the PostgreSQL menu, start the pgAdmin III application which you can use to explore the database. Double-click the PostgreSQL4OpenERP connection. You can find the password in the OpenERP server configuration file. If the database server is accessible you will be able to see some information about the empty database. If it is not, an error message will appear.
Are your client programs correctly installed? If your OpenERP GTK clients have not started, the swiftest approach is to reinstall them.
Can remote client computers see the server computer at all? Check this by opening a command prompt window (enter cmd in the window Start ‣ Run... ) and enter ping <address of server> there (where <address of server> represents the IP address of the server). The server should respond with a reply.
Have you changed any of the server's parameters? At this point in the installation the port number of the server must be 8069 using the protocol XML-RPC.
Is there anything else in the server's history that can help you identify the problem? Open the file openerp-server.log in C:\Program Files\OpenERP AllInOne(which you can only do when the server is stopped) and scan through the history for ideas. If something looks strange there, contributors to the OpenERP forums can often help identify the reason.
Installation on Linux (Ubuntu)¶
This section guides you through installing the OpenERP server and client on Ubuntu, one of the most popular Linux distributions. It assumes that you are using a recent release of Desktop Ubuntu with its graphical user interface on a desktop or laptop PC.
Other Linux Distributions
Installation on other distributions of Linux is fairly similar to installation on Ubuntu. Read this section of the book so that you understand the principles, then use the online documentation and the forums for your specific needs on another distribution.
For information about installation on other distributions, visit the documentation section by following Services ‣ Documentation on http://www.openerp.com. Detailed instructions are given there for different distributions and releases, and you should also check if there are more up to date instructions for the Ubuntu distribution as well.
Technical Procedure: Initial Installation and Configuration¶
Upgrade of Ubuntu packages and installation of OpenERP and pgadmin:
$ sudo apt-get update $ sudo apt-get upgrade $ sudo apt-get install openerp-server openerp-client pgadmin3
To avoid having some of the labels untranslated in the GTK client, install the language-pack-gnome-YOURLANG-base package. The following command installs the Spanish language pack:
$ sudo apt-get install language-pack-gnome-es-base
PostgreSQL version 8.4 has been used at the time of writing. You may have to replace the version number in the commands below with your own PostgreSQL version number if it differs. Postgres Database configuration:
$ sudo vi /etc/postgresql/8.4/main/pg_hba.conf
Replace the following line:
# “local” is for Unix domain socket connections only local all all ident
#”local” is for Unix domain socket connections only local all all md5
$ sudo /etc/init.d/postgresql-8.4 restart * Restarting PostgreSQL 8.4 database server [ OK ]
The following two commands will avoid problems with /etc/init.d/openerp-web INIT script:
$ sudo mkdir /home/openerp $ sudo chown openerp.nogroup /home/openerp
Create a user account called openerp with password “openerp” and with privileges to create Postgres databases:
$ sudo su postgres $ createuser openerp -P Enter password for new role: (openerp) Enter it again: Shall the new role be a superuser? (y/n) n Shall the new role be allowed to create databases? (y/n) y Shall the new role be allowed to create more new roles? (y/n) n
Quit from user postgres:
$ exit exit
Edit OpenERP configuration file:
$ sudo vi /etc/openerp-server.conf
Replace the following two lines (we don’t force to use a specific database and we add the required password to gain access to postgres):
db_name = db_user = openerp db_password = openerp
We can now restart openerp-server:
$ sudo /etc/init.d/openerp-server restart Restarting openerp-server: openerp-server.
Check out the logs:
$ sudo cat /var/log/openerp.log [2009-06-14 21:06:39,314] INFO:server:version – 6.0.0 [2009-06-14 21:06:39,314] INFO:server:addons_path – /usr/lib/openerp-server/addons [2009-06-14 21:06:39,314] INFO:server:database hostname – localhost [2009-06-14 21:06:39,315] INFO:server:database port – 5432 [2009-06-14 21:06:39,315] INFO:server:database user – openerp [2009-06-14 21:06:39,315] INFO:objects:initialising distributed objects services [2009-06-14 21:06:39,502] INFO:web-services:starting XML-RPC services, port 8069 [2009-06-14 21:06:39,502] INFO:web-services:starting NET-RPC service, port 8070 [2009-06-14 21:06:39,502] INFO:web-services:the server is running, waiting for connections…
OpenERP is now up and running, connected to Postgres database on port 5432 and listening on ports 8069 and 8070
$ ps uaxww | grep -i openerp openerp 5686 0.0 1.2 84688 26584 pts/7 Sl+ 12:36 0:03 /usr/bin/python ./openerp-server.py
$ sudo lsof -i :8069 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME python 5686 openerp 3u IPv4 116555 0t0 TCP *:8069 (LISTEN)
$ sudo lsof -i :8070 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME python 5686 openerp 5u IPv4 116563 0t0 TCP *:8070 (LISTEN)
Start the OpenERP GTK client by clicking its icon in the Applications ‣ Internet ‣ OpenERP Client menu, or by opening a terminal window and typing openerp-client . The OpenERP login dialog box should open and show the message No database found you must create one!.
Although this installation method is simple and therefore an attractive option, it is better to install OpenERP using a version downloaded from http://openerp.com. The downloaded revision is likely to be far more up to date than that available from a Linux distribution.
Maintaining packages is a process of development, testing and publication that takes time. The releases in OpenERP packages are therefore not always the latest available. Check the version number from the information on the website before installing a package. If only the third digit group differs (for example 6.0.1 instead of 6.0.2) then you may decide to install it because the differences may be minor – bug fixes rather than functionality changes between the package and the latest version.
Manual Installation of the OpenERP Server¶
In this section you will see how to install OpenERP by downloading it from the site http://openerp.com, and how to install the libraries and packages that OpenERP depends on, onto a desktop version of Ubuntu. Here is a summary of the procedure:
Navigate to the page http://openerp.com with your web browser,
Click the Download button on the right side,
Download the client and server files from the Sources section into your home directory (or some other location if you have defined a different download area).
To download the PostgreSQL database and all of the other dependencies for OpenERP from packages:
Start Synaptic Package Manager, and enter the root password as required.
Check that the repositories main , universe and restricted are enabled.
Search for a recent version of PostgreSQL (such as postgresql-8.4 then select it for installation along with its dependencies.
Select all of OpenERP's dependencies, an up-to-date list of which should be found in the installation documents on OpenERP's website, then click Apply to install them.
Python Programming Language
Python is the programming language that has been used to develop OpenERP. It is a dynamic, non-typed language that is object-oriented, procedural and functional. It comes with numerous libraries that provide interfaces to other languages and has the great advantage that it can be learnt in only a few days. It is the language of choice for large parts of NASA's, Google's and many other enterprises' code.
For more information on Python, explore http://www.python.org.
Once all these dependencies and the database are installed, install the server itself using the instructions on the website.
Open a terminal window to start the server with the command openerp-server, which should result in a series of log messages as the server starts up. If the server is correctly installed, the message [...] waiting for connections... should show within 30 seconds or so, which indicates that the server is waiting for a client to connect to it.
Manual Installation of OpenERP GTK Clients¶
To install an OpenERP GTK client, follow the steps outlined in the website installation document for your particular operating system.
Open a terminal window to start the client using the command openerp-client. When you start the client on the same Linux PC as the server you will find that the default connection parameters will just work without needing any change. The message No database found, you must create one! shows you that the connection to the server has been successful and you need to create a database on the server.
Creating the Database¶
You can connect other GTK clients over the network to your Linux server. Before you leave your server, make sure you know its network address – either by its name (such as mycomputer.mycompany.net ) or its IP address (such as 192.168.0.123 ).
Communications between an OpenERP client and server are based on standard protocols. You can connect Windows clients to a Linux server, or vice versa, without problems. It is the same for Mac versions of OpenERP – you can connect Windows and Linux clients and servers to them.
To install an OpenERP client on a computer under Linux, repeat the procedure shown earlier in this section. You can connect different clients to the OpenERP server by modifying the connection parameters on each client. To do that, click the Change button in the connection dialog and set the following fields as needed:
Server : name or IP address of the server over the network,
Port : the port, whose default is 8069 or 8070,
Connection protocol : XML-RPC or NET-RPC .
It is possible to connect the server to the client using a secure protocol to prevent other network users from listening in, but the installation described here is for direct unencrypted connection.
- If your Linux server is protected by a firewall you will have to provide access to port
8069 or 8070 for users on other computers with OpenERP GTK clients.
You can verify the installation by opening a web browser on the server and navigating to http://localhost:8069 to connect to the OpenERP web version as shown in the figure OpenERP web client at startup. You can also test this from another computer connected to the same network if you know the name or IP address of the server over the network – your browser should be set to http://<server_address>:8069 for this.
Verifying your Linux Installation¶
You have used default parameters so far during the installation of the various components. If you have had problems, or you just want to set this up differently, the following points provide some indicators about how you can set up your installation.
psql and pgAdmin tools
psql is a simple client, executed from the command line, that is delivered with PostgreSQL. It enables you to execute SQL commands on your OpenERP database.
If you prefer a graphical utility to manipulate your database directly you can install pgAdmin III (it is commonly installed automatically with PostgreSQL on a windowing system, but can also be found at http://www.pgadmin.org/ ).
The PostgreSQL database starts automatically and listens locally on port 5432 as standard: check this by entering sudo netstat -anpt at a terminal to see if port 5432 is visible there.
The database system has a default role of postgres accessible by running under the Linux postgres user: check this by entering sudo su postgres -c psql at a terminal to see the psql startup message – then type \q to quit the program.
If you try to start the OpenERP server from a terminal but get the message socket.error: (98, 'Address already in use') then you might be trying to start OpenERP while an instance of OpenERP is already running and using the sockets that you have defined (by default 8069 and 8070). If that is a surprise to you then you may be coming up against a previous installation of OpenERP or Tiny ERP, or something else using one or both of those ports.
Type sudo netstat -anpt to discover what is running there, and record the PID. You can check that the PID corresponds to a program you can dispense with by typing ps aux | grep <PID> and you can then stop the program from running by typing sudo kill <PID>. You need additional measures to stop it from restarting when you restart the server.
The OpenERP server has a large number of configuration options. You can see what they are by starting the server with the argument –help. By default the server configuration is stored in the file .terp_serverrc in the user's home directory (and for the postgres user that directory is /var/lib/postgresql .
You can delete the configuration file to be quite sure that the OpenERP server is starting with just the default options. It is quite common for an upgraded system to behave badly because a new version server cannot work with options from a previous version. When the server starts without a configuration file it will write a new one once there is something non-default to write to it – it will operate using defaults until then.
To verify that the system works, without becoming entangled in firewall problems, you can start the OpenERP client from a second terminal window on the server computer (which does not pass through the firewall). Connect using the XML-RPC protocol on port 8069 or NET-RPC on port 8070. The server can use both ports simultaneously. The window displays the log file when the client is started this way.
The client setup is stored in the file .terprc in the user's home directory. Since a GTK client can be started by any user, each user would have their setup defined in a configuration file in their own home directory.
You can delete the configuration file to be quite sure that the OpenERP client is starting with just the default options. When the client starts without a configuration file it will write a new one for itself.
The web server uses the NET-RPC protocol. If a GTK client works but the web server does not, then the problem is either with the NET-RPC port or with the web server itself, and not with the OpenERP server.
One Server for Several Companies
You can start several OpenERP application servers on one physical computer server by using different ports. If you have defined multiple database roles in PostgreSQL, each connected through an OpenERP instance to a different port, you can simultaneously serve many companies from one physical server at one time.