I won’t disappear entirely – I will still be in a few IRC channels and help in whatever little way I can.

Thank you everyone for the spectacular few years.

• Run ansible with -vvv.
• Login to the remote host where the command is being executed.
• Find the ansible process executing the command and kill them.
• The stdout and stderr should be printed to the console where ansible was running.

The exhibition showed off some of the work that CIS has been doing and the work of several independent artists. The bits that are particularly in my memory is Tara Kelton’s work as well as Sharath’s work.

Later in the day, Lawrence Liang talked about the Encyclopedia of Indian cinema. It was a very interesting talk, especially for me since it encompasses open data, open source software, and copyright issues! A convergence of a lot of my interests Lawrence talked about what they’ve built and the problems they’ve faced and how internet as a medium for a film encyclopedia is very powerful, but is limited by the legal issues surrounding copyright laws.

Indian Cinema

Indian Cinema Wiki

On that note, I’ll close with this video about copyright.

I know Disney is great, but I’m not sure I like them as much after this video.

One-time Pre-migration Steps

UTF-8

The default encoding on PostgreSQL is SQL_ASCII and you probably want UTF-8. If you don’t know what you want, you want UTF-8 (trust me). The easiest way was to blow away the default cluster and re-create it (Thanks jacobian!)

sudo pg_dropcluster --stop 9.1 main sudo pg_createcluster --start -e UTF-8 9.1 main

Make PostgreSQL listen on all interfaces

Edit /etc/postgresql/9.1/main/postgresql.conf and ensure PostgreSQL is listening on all interfaces.

listen_addresses = '0.0.0.0'

Allow access to PostgreSQL from the old server

Edit /etc/postgresql/9.1/main/pg_hba.conf and add an entry for the old server (where 123.123.123.123 is the IP address of the old server).

host    all             all             123.123.123.123/32       md5

Install client libraries on the old server

We use sqlalchemy for db access and I had to do apt-get install python-psycopg2.

Creating Users and Databases

Our process is to create a user for each app and have that app’s database be owned by this user, here’s a script that automated creating the user and database.

#!/bin/bash sudo -u postgres createuser -d -R -S $1 sudo -u postgres createdb $1 -O $1

The move

Import Preparation

Create user and database on the new server with the script above. Remember to set a password for this new user.

Exporting

The most worrisome bit about the whole migration was exporting the data from MySQL and importing it into PostgreSQL. We used mysql2psql and it didn’t give a lot of troubles except for the bit where floats got a little messed up. My personal recommendation is to not use real, but use numeric(7,4) with the accuracy adjusted for what you need (this particular definition is used for our lat/long definitions.

First, run mysql2psql on your command line, this will create the config file.

Now edit the mysql2psql.yml file and add your appropriate entries. Here’s what ours looked like

mysql:  hostname: localhost  port: 3306  socket: /var/run/mysqld/mysqld.sock  username: mysuperuser  password: mypassword  database: mydb  destination:  # if file is given, output goes to file, else postgres  file: mydb.sql  postgres:   hostname: localhost   port: 5432   username: mysql2psql   password:   database: mysql2psql_test  # if tables is given, only the listed tables will be converted.  leave empty to convert all tables. #tables: #- table1 #- table2 # if exclude_tables is given, exclude the listed tables from the conversion. #exclude_tables: #- table3 #- table4   # if supress_data is true, only the schema definition will be exported/migrated, and not the data supress_data: false  # if supress_ddl is true, only the data will be exported/imported, and not the schema supress_ddl: false  # if force_truncate is true, forces a table truncate before table loading force_truncate: false

When you run psql2mysql again, it will export the database mydb into mydb.sql. Before we did that, we removed this particular site from /etc/apache2/sites-enabled and restarted apache. We didn’t want the sql file to go stale as soon as it was exported. This is where the downtime starts

Importing

Copy the file over to the new server and import it into PostgreSQL with psql.

sudo -u mydb psql mydb < mydb.sql

In retrospect, I should have just imported it directly with mysql2psql. I was initially hesitant because it involved creating a user that could access that machine from outside. But I later realized I needed it anyway.

Go live!

Now change the settings on the old server to use the postgres database as the backend, enable the site in Apache and you’re all set to serve this site from PostgreSQL!

When I joined HasGeek last year, I’d committed for a minimum of 6 months. After 10 months at HasGeek, I’m moving on. I’m very exicted to announce that starting Oct 2, I’ll be working for the Open Knowledge Foundation a Data Wrangler and Web Developer! I’m very excited and looking forward to working with the amazing folks at OKFN. As Sunil pointed out, I’m now in the non-profit sector