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Daniel Westermann

Deploying your own PostgreSQL image on Nutanix Era

Some days ago we had a very good training on Nutanix. Nutanix is a Hyper-converged infrastructure and that means that all is software driven and the system can be deployed on many hardware configurations. I will not go into the details of the system itself but rather look at one component/module which is called Era. Era promises to simplify database deployments by providing a clean and simple user interface (and an API) that provides deployment procedures for PostgreSQL, MS SQL, MySQL, MariaDB and Oracle. There are predefined templates you can use but in this post I’ll look at how you can use Era to deploy your own PostgreSQL image.

Before you can register a software profile with Era there needs to be a VM up and running which already has PostgreSQL installed. For that I’ll import the latest CentOS 7 ISO with Prism (CentOS 8 is not yet supported).

Importing images is done in the “Images Configuration” section under “Settings” of Prism:


Once you start the upload a new task is generated which can be monitored in the tasks section:

Now that the image is ready we need to deploy a new virtual machine which will use the image as installation source:








As the virtual machine is now defined we need to power it on and then launch the console:


Follow your preferred way of doing the CentOS installation and once it is done you need to power off the virtual machine for removing the ISO. Otherwise you will always land in the installation procedure when the virtual machine is started:


After you powered of the virtual machine again you should be able to connect with ssh:

The next step is to install PostgreSQL as you prefer to do it. Here is an example for doing it from source code. We will not create a PostgreSQL instance, the binaries are enough. In my case everything was installed here:

 [email protected]:/home/postgres/ [pg121] echo $PGHOME
/u01/app/postgres/product/12/db_1/
[email protected]:/home/postgres/ [pg121] ls $PGHOME
bin  include  lib  share

Now that we have out PostgreSQL server we need to register the server in Era. Before doing that you should download and execute the pre-check script on the new database server:

[email protected]:/home/postgres/ [pg121] sudo ./era_linux_prechecks.sh

----------------------------------------------------------------------------------
   Error: Database type not specified
   Syntax: $ ./era_linux_prechecks.sh -t|--database_type  [-c|--cluster_ip ] [-p|--cluster_port] [-d|--detailed]
   Database type can be: oracle_database, postgres_database, mariadb_database, mysql_database
----------------------------------------------------------------------------------

[email protected]:/home/postgres/ [pg121] sudo ./era_linux_prechecks.sh -t postgres_database
libselinux-python-2.5-14.1.el7.x86_64


--------------------------------------------------------------------
|              Era Pre-requirements Validation Report              |
--------------------------------------------------------------------

     General Checks:
     ---------------
         1] Username           : root
         2] Package manager    : yum
         2] Database type      : postgres_database

     Era Configuration Dependencies:
     -------------------------------
         1] User has sudo access                         : YES
         2] User has sudo with NOPASS access             : YES
         3] Crontab configured for user                  : YES
         4] Secure paths configured in /etc/sudoers file : YES

     Era Software Dependencies:
     --------------------------
          1] GCC                  : N/A
          2] readline             : YES
          3] libselinux-python    : YES
          4] crontab              : YES
          5] lvcreate             : YES
          6] lvscan               : YES
          7] lvdisplay            : YES
          8] vgcreate             : YES
          9] vgscan               : YES
         10] vgdisplay            : YES
         11] pvcreate             : YES
         12] pvscan               : YES
         13] pvdisplay            : YES
         14] zip                  : NO
         15] unzip                : YES
         16] rsync                : NO

     Summary:
     --------
         This machine does not satisfy all of the dependencies required by Era.
         It can not be onboarded to Era unless all of these are satified.

     **WARNING: Cluster API was not provided. Couldn't go ahead with the Prism API connectivity check.
     Please ensure Prism APIs are callable from the host.
====================================================================
[email protected]:/home/postgres/ [pg121]

In my case only “zip” and “rsync” are missing which of course is easy to fix:

[email protected]:/home/postgres/ [pg121] sudo yum install -y zip rsync
...
[email protected]:/home/postgres/ [pg121] sudo ./era_linux_prechecks.sh -t postgres_database
libselinux-python-2.5-14.1.el7.x86_64


--------------------------------------------------------------------
|              Era Pre-requirements Validation Report              |
--------------------------------------------------------------------

     General Checks:
     ---------------
         1] Username           : root
         2] Package manager    : yum
         2] Database type      : postgres_database

     Era Configuration Dependencies:
     -------------------------------
         1] User has sudo access                         : YES
         2] User has sudo with NOPASS access             : YES
         3] Crontab configured for user                  : YES
         4] Secure paths configured in /etc/sudoers file : YES

     Era Software Dependencies:
     --------------------------
          1] GCC                  : N/A
          2] readline             : YES
          3] libselinux-python    : YES
          4] crontab              : YES
          5] lvcreate             : YES
          6] lvscan               : YES
          7] lvdisplay            : YES
          8] vgcreate             : YES
          9] vgscan               : YES
         10] vgdisplay            : YES
         11] pvcreate             : YES
         12] pvscan               : YES
         13] pvdisplay            : YES
         14] zip                  : YES
         15] unzip                : YES
         16] rsync                : YES

     Summary:
     --------
         This machine satisfies dependencies required by Era, it can be onboarded.

Looks good and the database server can now be registered:




Era as well has a task list which can be monitored:

… and then it fails because PostgreSQL 12.1 is not supported. That is fine but I would have expected the pre-check script to tell me that. Same procedure again, this time with PostgreSQL 11.6 and that succeeds:

This database server is now the source for a new “Software profile”:




And that’s it: Our new PostgreSQL software profile is ready to use. In the next post we’ll try to deploy a new virtual machine from that profile.

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Daniel Westermann
Daniel Westermann

Principal Consultant & Technology Leader Open Infrastructure