Courtesy :
Alan Lord
The new release of OpenERP 6.1
heralds a great many incremental improvements
in the product plus a complete re-write of the web interface; which is a
massive improvement and much more an integral part of OpenERP than it’s
predecessor.
As my
previous howto for 6.0 was a such roaring success I thought I’d better do something for the new 6.1 release too.
Before continuing, I should mention that you can simply
download
a “.deb” package of OpenERP 6.1 and install that on Ubuntu. But that
doesn’t provide me with enough fine grained control over what and where
things get installed and it restricts our flexibility to modify &
customise hence I prefer to do it a slightly more manual way…
(It should be said though, that this install process should only take about 10-15 minutes once the host machine has been built)
So without further ado here we go:
Step 1. Build your server
I install just the bare minimum from the install routine (you can install the
openssh-server during the install procedure or install subsequently depending on your preference).
After the server has restarted for the first time I install the
openssh-server package (so we can connect to it remotely) and
denyhosts
to add a degree of brute-force attack protection. There are other
protection applications available: I’m not saying this one is the best,
but it’s one that works and is easy to configure and manage. If you
don’t already, it’s also worth looking at setting up key-based ssh
access, rather than relying on passwords. This can also help to limit
the potential of brute-force attacks. [NB: This isn't a How To on
securing your server...]
sudo apt-get install openssh-server denyhosts
Now make sure you are running all the latest patches by doing an update:
sudo apt-get update
sudo apt-get dist-upgrade
Although not always essential it’s probably a good idea to reboot
your server now and make sure it all comes back up and you can login via
ssh.
Now we’re ready to start the OpenERP install.
Step 2. Create the OpenERP user that will own and run the application
sudo adduser --system --home=/opt/openerp --group openerp
This is a “system” user. It is there to own and run the application,
it isn’t supposed to be a person type user with a login etc. In Ubuntu, a
system user gets a UID below 1000, has no shell (it’s actually
/bin/false) and has logins disabled. Note that I’ve specified a “home” of
/opt/openerp,
this is where the OpenERP server code will reside and is created
automatically by the command above. The location of the server code is
your choice of course, but be aware that some of the instructions and
configuration files below may need to be altered if you decide to
install to a different location.
A question I was asked a few times in the previous how to for 6.0 was
how to run the OpenERP server as the openerp system user from the
command line if it has no shell. This can be done quite easily:
sudo su - openerp -s /bin/bash
This will
su your current terminal login to the openerp user (the “
-” between
su and
openerp is correct) and use the shell
/bin/bash. When this command is run you will be in openerp’s home directory:
/opt/openerp.
When you have done what you need you can leave the openerp user’s shell by typing
exit.
Step 3. Install and configure the database server, PostgreSQL
sudo apt-get install postgresql
Then configure the OpenERP user on postgres:
First change to the postgres user so we have the necessary privileges to configure the database.
sudo su - postgres
Now create a new database user. This is so OpenERP has access rights
to connect to PostgreSQL and to create and drop databases. Remember what
your choice of password is here; you will need it later on:
createuser --createdb --username postgres --no-createrole --no-superuser --pwprompt openerp
Enter password for new role: ********
Enter it again: ********
Finally exit from the postgres user account:
exit
Step 4. Install the necessary Python libraries for the server
Update 27/02/2012: Many thanks to Gavin for reporting. Have added python-simplejson to the package list.
sudo apt-get install python-dateutil python-feedparser python-gdata \
python-ldap python-libxslt1 python-lxml python-mako python-openid python-psycopg2 \
python-pybabel python-pychart python-pydot python-pyparsing python-reportlab \
python-simplejson python-tz python-vatnumber python-vobject python-webdav \
python-werkzeug python-xlwt python-yaml python-zsi
From what I can tell, on Ubuntu 10.04 the package python-werkzeug
is too old and this will cause the server to not start properly. If you
are trying this on a later version of Ubuntu then you might be OK, but
just in-case you can also do the following.
I found it necessary to install a more recent version of
Werkzeug using Python’s own package management library PIP. The python
pip tool can be installed like this:
sudo apt-get install python-pip
Then remove Ubuntu’s packaged version of werkzeug:
sudo apt-get remove python-werkzeug
Then install the up-to-date version of werkzeug:
sudo pip install werkzeug
With that done, all the dependencies for installing OpenERP 6.1 are now satisfied, including for the new integral web interface.
Step 5. Install the OpenERP server
I tend to use
wget for this sort of thing and I download the files to my home directory.
Make sure you get the latest version of the application. At the time
of writing this it’s 6.1-1; I got the download links from their download
page.
wget http://nightly.openerp.com/6.1/releases/openerp-6.1-1.tar.gz
Now install the code where we need it:
cd to the
/opt/openerp/ directory and extract the tarball there.
cd /opt/openerp
sudo tar xvf ~/openerp-6.1-1.tar.gz
Next we need to change the ownership of all the the files to the OpenERP user and group.
sudo chown -R openerp: *
And finally, the way I have done this is to copy the server directory
to something with a simpler name so that the configuration files and
boot scripts don’t need constant editing (I called it, rather
unimaginatively, server). I started out using a symlink solution, but I
found that when it comes to upgrading, it seems to make more sense to me
to just keep a copy of the files in place and then overwrite them with
the new code. This way you keep any custom or user-installed modules and
reports etc. all in the right place.
sudo cp -a openerp-6.1-1 server
As an example, should OpenERP 6.1-2 come out soon, I can extract the
tarballs into /opt/openerp/ as above. I can do any testing I need, then
repeat the copy command so that the modified files will overwrite as
needed and any custom modules, report templates and such will be
retained. Once satisfied the upgrade is stable, the older 6.1-1
directories can be removed if wanted.
That’s the OpenERP server software installed. The last steps to a
working system is to set up the configuration file and associated boot
script so OpenERP starts and stops automatically when the server itself
stops and starts.
Step 6. Configuring the OpenERP application
The default configuration file for the server (in
/opt/openerp/server/install/)
is actually very minimal and will, with only one small change work fine
so we’ll simply copy that file to where we need it and change it’s
ownership and permissions:
sudo cp /opt/openerp/server/install/openerp-server.conf /etc/
sudo chown openerp: /etc/openerp-server.conf
sudo chmod 640 /etc/openerp-server.conf
The above commands make the file owned and writeable only by the openerp user and group and only readable by openerp and root.
To allow the OpenERP server to run initially, you should only need to
change one line in this file. Toward to the top of the file change the
line
db_password = False to the same password you used back in step 3. Use your favourite text editor here. I tend to use nano, e.g.
sudo nano /etc/openerp-server.conf
One other line we might as well add to the configuration file now, is
to tell OpenERP where to write its log file. To complement my suggested
location below add the following line to the
openerp-server.conf file:
logfile = /var/log/openerp/openerp-server.log
Once the configuration file is edited and saved, you can start the server just to check if it actually runs.
sudo su - openerp -s /bin/bash
/opt/openerp/server/openerp-server
If you end up with a few lines eventually saying OpenERP is running and waiting for connections then you are all set. Just type
CTL+C to stop the server then
exit to leave the openerp user’s shell.
If there are errors, you’ll need to go back and check where the problem is.
Step 7. Installing the boot script
For the final step we need to install a script which will be used to
start-up and shut down the server automatically and also run the
application as the correct user. There is a script you can use in
/opt/openerp/server/install/openerp-server.init but this will need a few small modifications to work with the system installed the way I have described above.
Here’s a link to the one I’ve already modified for 6.1-1.
Similar to the configuration file, you need to either copy it or paste the contents of this script to a file in
/etc/init.d/ and call it
openerp-server. Once it is in the right place you will need to make it executable and owned by root:
sudo chmod 755 /etc/init.d/openerp-server
sudo chown root: /etc/init.d/openerp-server
In the configuration file there’s an entry for the server’s log file.
We need to create that directory first so that the server has somewhere
to log to and also we must make it writeable by the openerp user:
sudo mkdir /var/log/openerp
sudo chown openerp:root /var/log/openerp
Step 8. Testing the server
To start the OpenERP server type:
sudo /etc/init.d/openerp-server start
You should now be able to view the logfile and see that the server has started.
less /var/log/openerp/openerp-server.log
If there are any problems starting the server you need to go back and
check. There’s really no point ploughing on if the server doesn’t
start…
OpenERP 6.1 Home Screen
If the log file looks OK, now point your web browser at the domain or IP
address of your OpenERP server (or localhost if you are on the same
machine) and use port 8069. The url will look something like this:
http://IP_or_domain.com:8069
What you should see is a screen like this one:
What I do recommend you do at this point is to change the super admin
password to something nice and strong (Click the “Manage Databases”
link below the main Login box). By default this password is just “admin”
and knowing that, a user can create, backup, restore and
drop databases! This password is stored in
plain text in the
/etc/openerp-server.conf file;
hence why we restricted access to just openerp and root. When you change and save the new password the
/etc/openerp-server.conf file will be re-written and will have a lot more options in it.
Now it’s time to make sure the server stops properly too:
sudo /etc/init.d/openerp-server stop
Check the logfile again to make sure it has stopped and/or look at your server’s process list.
Step 9. Automating OpenERP startup and shutdown
If everything above seems to be working OK, the final step is make
the script start and stop automatically with the Ubuntu Server. To do
this type:
sudo update-rc.d openerp-server defaults
You can now try rebooting you server if you like. OpenERP should be running by the time you log back in.
If you type
ps aux | grep openerp you should see a line similar to this:
openerp 1491 0.1 10.6 207132 53596 ? Sl 22:23 0:02 python /opt/openerp/server/openerp-server -c /etc/openerp-server.conf
Which shows that the server is running. And of course you can check the logfile or visit the server from your web browser too.
That’s it!
OpenERP 6.1 really is a major step up in terms of improvements from
6.0 and the new integrated web interface (with a Point of Sale and a
Mobile interface built-in) are really very cool. Performance has
improved considerably and the way the new web service interfaces to
OpenERP is very different. So, if I get the time, the next instalment of
these posts will go into a bit of detail about how this works and some
alternative ways to provide more secure access, such as reverse proxy.
License :
http://creativecommons.org/licenses/by-sa/3.0/ 
