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postgresql_software_collection.md

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Currently ManageIQ requires version 9.4 or newer of PostgreSQL, but the version included in some Linux distributions (CentOS and RHEL 7, for example) is 9.2, and that won't change in the near future.

In order to use version 9.4 you can use the packages provided by SoftwareCollections.org.

Enable the SoftwareCollections.org repository

The first thing you need to do is to enable the SoftwareCollections.org package repository. If you are using CentOS then the command is the following:

$ sudo yum -y install centos-release-scl

Make sure that old packages are removed

If you have older versions of the postgresql packages installed you may encounter conflicts with network ports, so it is good idea to stop the database and remove those older packages before installing the new version:

$ sudo systemctl stop postgresql-server
$ sudo systemctl disable postgresql-server
$ sudo yum -y remove 'postgresql-*'

The pg gem will also need to be re-compiled, so make sure you remove it:

 $ gem uninstall pg

It will be re-compiled and re-installed the next time you run bin/setup.

Install the PostgreSQL 9.4 collection

Then you need to install the software collection for version 9.4 (or newer) of PostgreSQL:

$ sudo yum -y install \
rh-postgresql94-postgresql-server \
rh-postgresql94-postgresql-devel

This will install the required files under /opt/rh/rh-postgresql94, so each time you need to use a command like pgsql you will have to use the complete path. Alternatively, you can enable that collection:

$ scl enable rh-postgresql94 bash

This will spawn a new shell where you can use the commands without the full path, and it is useful when don't need to run commands frequently. But as you will probably want to run commands like psqlquite often, it is better to enable the collection permanently, adding the following to the relevant .bash_profile files:

source /opt/rh/rh-postgresql94/enable

It is good idea to add this to your personal .bash_profile:

$ cat > $HOME/.bash_profile <<.
source /opt/rh/rh-postgresql94/enable
.

Create and configure the database

By default the database directory used by the software collection is /var/opt/rh/rh-postgresql94/lib/pgsql/data, but the ManageIQ instructions assume it to be /var/lib/pgsql/data. The name of the service is also different. Make sure to take these differences into account when creating and configure the database. For example, to initially create the database you will need to do the following:

$ su - root
# scl enable rh-postgresql94 bash
# postgresql-setup initdb

To setup authentication you will need to modify the pg_hba.conf file, as described in the instructions, but taking into account the different location:

$ PGDATA=/var/opt/rh/rh-postgresql94/lib/pgsql/data
$ sudo grep -q '^local\s' $PGDATA/pg_hba.conf || echo "local all all trust" | sudo tee -a $PGDATA/pg_hba.conf
$ sudo sed -i.bak 's/\(^local\s*\w*\s*\w*\s*\)\(peer$\)/\1trust/' $PGDATA/pg_hba.conf

To enable and start the server:

$ sudo systemctl enable rh-postgresql94-postgresql
$ sudo systemctl start rh-postgresql94-postgresql

And, finally, to create the database user:

$ su - postgres
$ scl enable rh-postgresql94 bash
$ psql -c "CREATE ROLE root SUPERUSER LOGIN PASSWORD 'smartvm'"