SUNScholar/Prepare Ubuntu/S06

Step 6. Install PostgreSQL

DSpace can use the PostgreSQL or Oracle database server for the main database.

The following procedure installs the PostgreSQL database server and creates the "dspace" database and "dspace" database user with the very secret dspace database user password.

The PostgreSQL database server was chosen because it is open source software and this in keeping with the open access pathos.

Step 6.1: Install PostgreSQL

Note: For Ubuntu 12.04, simply install "libpg-java", the database is installed during the installation using "tasksel".

sudo apt-get install postgresql-8.4 libpg-java

Step 6.2: Setup PostgreSQL admin password

Note: Ubuntu 12.04 has upgraded PostgreSQL to version 9.1. So change all references from "8.4" to "9.1" below.

Change database user permissions to "trust" only.

sudo sed -i 's/ident/trust/' /etc/postgresql/8.4/main/pg_hba.conf

sudo sed -i 's/md5/trust/' /etc/postgresql/8.4/main/pg_hba.conf

See example below.

# DO NOT DISABLE!
# If you change this first entry you will need to make sure that the
# database superuser can access the database using some other method.
# Noninteractive access to all databases is required during automatic
# maintenance (custom daily cronjobs, replication, and similar tasks).
#
# Database administrative login by Unix domain socket
local   all             postgres                                peer

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     peer
# IPv4 local connections:
host    all             all             127.0.0.1/32            trust
# IPv6 local connections:
host    all             all             ::1/128                 trust
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local   replication     postgres                                peer
#host    replication     postgres        127.0.0.1/32            trust
#host    replication     postgres        ::1/128                 trust

Restart database server.

Note: For Ubuntu 12.04, the PostgreSQL restart command has changed to "sudo /etc/init.d/postgresql restart".

sudo /etc/init.d/postgresql-8.4 restart

Become the postgres user

sudo su postgres

Open a database shell...

psql -U postgres

... and set the password:

ALTER ROLE postgres WITH PASSWORD 'XXXXXX';

Note: Use your unique system admin password for this on a production system !

Quit the database shell.

\q

Step 6.3: Create the PostgreSQL "dspace" user

Create the "dspace" user with full privileges.

createuser -U postgres -d -A -P dspace

If asked the following:

Shall the new role be allowed to create more new roles? (y/n) y

Answer "y" for yes.

Step 6.4: Create the PostgreSQL 'dspace' database

Create the "dspace" database with the "dspace" database user as owner.

createdb -E UNICODE dspace

Set the dspace database user password.

psql -U postgres

... and set the password:

ALTER ROLE dspace WITH PASSWORD 'XXXXXX';

Note: Use your unique dspace database password for this on a production system !

Let the dspace postgresql database user own the dspace database

ALTER DATABASE dspace OWNER TO dspace;

Quit the database shell.

\q

We return to the dspace user

exit

Step 6.5: Setup database host and user access permissions

Type the following:

sudo echo "## DSpace user access">> /etc/postgresql/8.4/main/pg_hba.conf

sudo echo "host    dspace       dspace      127.0.0.1/32         md5">> /etc/postgresql/8.4/main/pg_hba.conf

Step 6.6: Setup number of client connections

Edit the postgresql config file:

sudo nano /etc/postgresql/8.4/main/postgresql.conf

Change the number of "max_connections" to 300.

---

NANO Editor Help

CTL+O	= Save the file and then press Enter
CTL+X	= Exit "nano"
CTL+K	= Delete line
CTL+U	= Undelete line
CTL+W	= Search for %%string%%
CTL+\	= Search for %%string%% and replace with $$string$$
CTL+C	= Show line numbers

More info = http://en.wikipedia.org/wiki/Nano_(text_editor)

---

Step 6.7: Increase the kernel shared memory for postgresql connections

Edit the "/etc/sysctl.conf" file:

sudo nano /etc/sysctl.conf

Copy and paste the following to the end of the file:

# Postgres connections
kernel.shmmax = 500000000
kernel.shmall = 500000000

---

NANO Editor Help

CTL+O	= Save the file and then press Enter
CTL+X	= Exit "nano"
CTL+K	= Delete line
CTL+U	= Undelete line
CTL+W	= Search for %%string%%
CTL+\	= Search for %%string%% and replace with $$string$$
CTL+C	= Show line numbers

More info = http://en.wikipedia.org/wiki/Nano_(text_editor)

---

Type the following in a terminal:

sudo sysctl -p

Step 6.8: Restart the PostgreSQL server

Type the following:

Note: For Ubuntu 12.04, the PostgreSQL restart command has changed to "sudo /etc/init.d/postgresql restart".

sudo /etc/init.d/postgresql-8.4 restart

---

Below is a screenshot of the yearly DB connections.

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