10.2. Upgrading Remote Databases from PostgreSQL 9.2 to 9.5

Red Hat Virtualization 4.2 uses PostgreSQL 9.5 instead of PostgreSQL 9.2. If your databases are installed locally, the upgrade script will automatically upgrade them from version 9.2 to 9.5. However, if either of your databases (Manager or Data Warehouse) is installed on a separate machine, you must perform the following procedure on each remote database before upgrading the Manager.

  1. Stop the service running on the machine:

    • Stop the ovirt-engine service on the Manager machine:

      # systemctl stop ovirt-engine
    • Stop the ovirt-engine-dwh service on the Data Warehouse machine:

      # systemctl stop ovirt-engine-dwhd
  2. Enable the required repository to receive the PostgreSQL 9.5 package:

    Enable either the Red Hat Virtualization Manager repository:

    # subscription-manager repos --enable=rhel-7-server-rhv-4.2-manager-rpms

    or the SCL repository:

    # subscription-manager repos --enable rhel-server-rhscl-7-rpms
  3. Install the PostgreSQL 9.5 packages:

    # yum install rh-postgresql95 rh-postgresql95-postgresql-contrib
  4. Stop and disable the PostgreSQL 9.2 service:

    # systemctl stop postgresql
    # systemctl disable postgresql
  5. Upgrade the PostgreSQL 9.2 database to PostgreSQL 9.5:

    # scl enable rh-postgresql95 -- postgresql-setup upgrade
  6. Start and enable the rh-postgresql95-postgresql.service and check that it is running:

    # systemctl start rh-postgresql95-postgresql.service
    # systemctl enable rh-postgresql95-postgresql.service
    # systemctl status rh-postgresql95-postgresql.service

    Ensure that you see an output similar to the following:

    rh-postgresql95-postgresql.service - PostgreSQL database server
       Loaded: loaded (/usr/lib/systemd/system/rh-postgresql95-postgresql.service;
    enabled; vendor preset: disabled)
       Active: active (running) since Mon 2018-05-07 08:48:27 CEST; 1h 59min ago
  7. Log in to the database and enable the uuid-ossp extension:

    # su - postgres -c "scl enable rh-postgresql95 -- psql -d database-name"
  8. Execute the following SQL commands:

    # database-name=# DROP FUNCTION IF EXISTS uuid_generate_v1();
    # database-name=# CREATE EXTENSION "uuid-ossp";
  9. Copy the pg_hba.conf client configuration file from the 9.2 environment to your 9.5 environment:

    # cp -p /var/lib/pgsql/data/pg_hba.conf  /var/opt/rh/rh-postgresql95/lib/pgsql/data/pg_hba.conf
  10. Update the following parameters in /var/opt/rh/rh-postgresql95/lib/pgsql/data/postgresql.conf:

    listen_addresses='*'
    autovacuum_vacuum_scale_factor = 0.01
    autovacuum_analyze_scale_factor = 0.075
    autovacuum_max_workers = 6
    maintenance_work_mem = 65536
    max_connections = 150
    work_mem = 8192
  11. Restart the PostgreSQL 9.5 service to apply the configuration changes:

    # systemctl restart rh-postgresql95-postgresql.service
  12. Start the ovirt-engine-dwhd service:

    # systemctl start ovirt-engine-dwhd

You can now update the Manager to the latest version of 4.1.