Skip to main content

Postgresql database configuration for global access


Openbravo ERP supports  couple of database like Oracle and PostgreSql. But my inclination is for PostgreSql database, because it is Opensource, and has almost all features of an Enterprise level RDBMS (Relational Database Management System). For more information on PostgreSql, refer here. For installation of PostgreSql on Ubuntu, refer here and for Windows, you can download from here. You can also refer a more expanded version of the same from here.
Installing PostgreSql is pretty easy and there is tool pgAdmin that will further simplify the use of the database. By default, PostgreSql will be mapped to your localhost, but for accessing it across Systems and for connecting to other PostgreSql database listening across various Systems, couple of configurations are to be done. I have presented the configuration steps in Ubuntu and it is nearly the same in Windows machine also. Just that the folders will be little different.
Step 1 : Modifying pg_hba.conf
  • Type the following commands in the Terminal.
1cd /etc/postgresql/8.4/main/
2
3sudo gedit pg_hba.conf
  • This will open the pg_hba.conf configuration file in text editor. The pg_hba.conf file controls which hosts are allowed to connect, how clients are authenticated, which PostgreSql user names they can use, which databases they can access. There will be values like,
1HOST       DATABASE  USER  CIDR-ADDRESS  METHOD  [OPTIONS]
  • In the Method, the values will be ident by default. We have to change all ‘ident’ to ‘md5′ because md5 sends encrypted passwords.
  • Under the heading IPV4 local connections, we should add rows for IP values that can be connected to our System. For that we have to provide the IP addresses that we want to connect. By default, the value will be 127.0.0.1/32 which is the localhost. If we provide 0.0.0.0/0 it will be available for connections to all Systems.
  • Though the connections are available for all Systems, you have to map which addresses the database should listen on. This is configured in postgresql.conf. That configuration is presented below.
Step 2: Modifying postgresql.conf
  • Type the following commands in the Terminal.
    • sudo gedit pg_hba.conf
  • This configuration file is read on server startup and when the server receives a SIGHUP signal.  If you edit the file on a running system, you have to SIGHUP the server for the changes to take effect, or use “pg_ctl reload”.
  • Under Connection Settings, there will be  a value for Listen Address. This provides us the information about what IP address(es) to listen on.
  • By default this value will be, listen_addresses = ‘localhost’, we have to modify it to listen_addresses = ‘*’.There will be  ’#’ before this line. # character is used for commenting. So for this changes to take place, you have to uncomment it by removing the ‘#’ character.
You have to restart the PostgreSql database for these changes to take effect. Keep me posted here, if you have any doubts in this regard.
Happy Working..:)

Comments

Popular posts from this blog

My 10 years in Application Development

It's been around 10 years since I started programming. May be a bit more, if I have to include my first attempts at C programming in school. But it would be a grave insult to call remembering ten lines of code and just replicating it to put a star on the screen. I also did a course on Visual basic, but it was more gimmicks that Application development. But it was truly in the year 2007 when I started my Master in Computer Applications that I found a new flare for developing applications. 
I was very late to computers in general and even when I joined my Masters, computers were not really accessible to me. But when I joined my Masters where one is actually expected to hone the skills which they already have, but in case it was were I was learning the skills, initially it was very difficult. I was not sure what computers had for me nor I had a natural flair for programming. But the thing about computers that attracted me was the visual medium it gave. Initially it was just a door t…

Changing Timezone in Postgresql, Ubuntu

Timezone and locale are integral concepts that one should be aware of when implementing a System. For example. if you create a database in PostgreSql, it will use the default System settings for the database. Lets say you have a server in UK and your client is US. If the client tries to retrieve the current date or time, it is going to show the UK time and not the US one.
Today I encountered a different issue in our client place where the Ubuntu timezone and PostgreSql timezone were showing a incorrect values. Instead of Indian Standard Time (IST) it was showing Pacific Daylight Time(PDT). These are the steps that I followed to change the timezone to IST in PostgreSql and Ubuntu.
Changing timezone in Ubuntu:
sudo dpkg-reconfigure tzdataYou will be prompted to choose the continent and then the area. Provided screen shots where we configure the location.
Use TAB key to navigate to the OK button and then press Enter.

The changes will get reflected immediately. To check it you can open a n…

Apps to install after installing Ubuntu

Here are the list of apps that I almost use on a day to day basis. This blog will be updated with the apps in the subsequent versions.

Docky (MAC like doc)Nylas N1 (Email client)SkypeVimPathogen package managerTwitvimNERDTreeSublime TextVLC Media PlayerSSHUnity tweak toolOpenbravo ERP stackJavaAntPostgresqlTomcatEclipse IndigoNode.js (useful for many plugins)Google ChromeNoobs Labs Ubuntu themes and iconsTeamviewerFogger App