WarehousePG

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Installing WarehousePG ​

Describes how to install the WarehousePG software binaries on all of the hosts that will comprise your WarehousePG cluster, how to enable passwordless SSH for the gpadmin user, and how to verify the installation.

Perform the following tasks in order:

  1. Install WarehousePG:
  2. Enabling Passwordless SSH
  3. Confirm the software installation.
  4. Next Steps

Parent topic: Installing and Upgrading WarehousePG

Installing WarehousePG ​

You must install WarehousePG on each host machine of the WarehousePG cluster.

WarehousePG software aiss a downloadable package that you install on each host system with the operating system's package management system.

Open source WarehousePG releases are available as RPM installers for RHEL Linux.

Downloading the WarehousePG Server Software (WarehousePG) ​

You can download the WarehousePG Server software package from the github repo.

Be sure to note the name and the file system location of the downloaded file.

Installing WarehousePG ​

Before you begin installing WarehousePG, be sure you have completed the steps in Configure Operating System to configure each of the coordinator, standby coordinator, and segment host machines for WarehousePG.

Important After installing WarehousePG, you must set WarehousePG environment variables. See Setting WarehousePG Environment Variables.

Follow these instructions to install WarehousePG from a pre-built binary.

Important You require sudo or root user access to install from a pre-built RPM or DEB file.

  1. Download and copy the WarehousePG package to the gpadmin user's home directory on the coordinator, standby coordinator, and every segment host machine. The distribution file name has the format greenplum-db-<version>-<platform>.rpm for RHEL, Oracle Linux, or Rocky Linux systems.

    Note For Oracle Linux or Rocky Linux installations, download and install the rhel8-x86_64distribution files.

  2. With sudo (or as root), install the WarehousePG package on each host machine using your system's package manager software:

    $ sudo yum install ./greenplum-db-<version>-<platform>.rpm

    The yum command automatically installs software dependencies, copies the WarehousePG software files into a version-specific directory under /usr/local, /usr/local/greenplum-db-<version>, and creates the symbolic link /usr/local/greenplum-db to the installation directory.

  3. Change the owner and group of the installed files to gpadmin:

    $ sudo chown -R gpadmin:gpadmin /usr/local/greenplum*
$ sudo chgrp -R gpadmin /usr/local/greenplum*

(Optional) Installing to a Non-Default Directory ​

On RHEL systems, you can use the rpm command with the --prefix option to install WarehousePG to a non-default directory (instead of under /usr/local). Note, however, that using rpm does not automatically install WarehousePG dependencies; you must manually install dependencies to each host system.

Follow these instructions to install WarehousePG to a specific directory.

Important You require sudo or root user access to install from a pre-built RPM file.

  1. Download and copy the WarehousePG package to the gpadmin user's home directory on the coordinator, standby coordinator, and every segment host machine. The distribution file name has the format greenplum-db-<version>-rhel8-x86_64.rpm for RHEL/Oracle/Rocky Linux systems.

  2. Manually install the WarehousePG dependencies to each host system:

    $ sudo yum install apr apr-util bash bzip2 curl krb5 libcurl libevent \
libxml2 libyaml zlib openldap openssh openssl openssl-libs perl readline rsync R sed tar zip

  3. Use rpm with the --prefix option to install the WarehousePG package to your chosen installation directory on each host machine:

    $ sudo rpm --install ./greenplum-db-<version>-<platform>.rpm --prefix=<directory>

    The rpm command copies the WarehousePG software files into a version-specific directory under your chosen <directory>, <directory>/greenplum-db-<version>, and creates the symbolic link <directory>/greenplum-db to the versioned directory.

  4. Change the owner and group of the installed files to gpadmin:

    $ sudo chown -R gpadmin:gpadmin <directory>/greenplum*

Note All example procedures in the WarehousePG documentation assume that you installed to the default directory, which is /usr/local. If you install to a non-default directory, substitute that directory for /usr/local.

If you install to a non-default directory using rpm, you will need to continue using rpm (and of yum) to perform minor version upgrades; these changes are covered in the upgrade documentation.

Enabling Passwordless SSH ​

The gpadmin user on each WarehousePG host must be able to SSH from any host in the cluster to any other host in the cluster without entering a password or passphrase (called "passwordless SSH"). If you enable passwordless SSH from the coordinator host to every other host in the cluster ("1-n passwordless SSH"), you can use the WarehousePG gpssh-exkeys command-line utility to enable passwordless SSH from every host to every other host ("n-n passwordless SSH").

  1. Log in to the coordinator host as the gpadmin user.

  2. Source the path file in the WarehousePG installation directory.

    $ source /usr/local/greenplum-db-<version>/greenplum_path.sh

    Note Add the above source command to the gpadmin user's .bashrc or other shell startup file so that the WarehousePG path and environment variables are set whenever you log in as gpadmin.

  3. Use the ssh-copy-id command to add the gpadmin user's public key to the authorized_hosts SSH file on every other host in the cluster.

    $ ssh-copy-id scdw
$ ssh-copy-id sdw1
$ ssh-copy-id sdw2
$ ssh-copy-id sdw3
. . .

    This enables 1-n passwordless SSH. You will be prompted to enter the gpadmin user's password for each host. If you have the sshpass command on your system, you can use a command like the following to avoid the prompt.

    $ SSHPASS=<password> sshpass -e ssh-copy-id scdw

  4. In the gpadmin home directory, create a file named hostfile_exkeys that has the machine configured host names and host addresses (interface names) for each host in your WarehousePG cluster (coordinator, standby coordinator, and segment hosts). Make sure there are no blank lines or extra spaces. Check the /etc/hosts file on your systems for the correct host names to use for your environment. For example, if you have a coordinator, standby coordinator, and three segment hosts with two unbonded network interfaces per host, your file would look something like this:

    cdw
cdw-1
cdw-2
scdw
scdw-1
scdw-2
sdw1
sdw1-1
sdw1-2
sdw2
sdw2-1
sdw2-2
sdw3
sdw3-1
sdw3-2

  5. Run the gpssh-exkeys utility with your hostfile_exkeys file to enable n-n passwordless SSH for the gpadmin user.

    $ gpssh-exkeys -f hostfile_exkeys

Confirming Your Installation ​

To make sure the WarehousePG software was installed and configured correctly, run the following confirmation steps from your WarehousePG coordinator host. If necessary, correct any problems before continuing on to the next task.

  1. Log in to the coordinator host as gpadmin:

    $ su - gpadmin

  2. Use the gpssh utility to see if you can log in to all hosts without a password prompt, and to confirm that the WarehousePG software was installed on all hosts. Use the hostfile_exkeys file you used to set up passwordless SSH. For example:

    $ gpssh -f hostfile_exkeys -e 'ls -l /usr/local/greenplum-db-<version>'

    If the installation was successful, you should be able to log in to all hosts without a password prompt. All hosts should show that they have the same contents in their installation directories, and that the directories are owned by the gpadmin user.

    If you are prompted for a password, run the following command to redo the ssh key exchange:

    $ gpssh-exkeys -f hostfile_exkeys

About Your WarehousePG Installation ​

  • greenplum_path.sh — This file contains the environment variables for WarehousePG. See Setting WarehousePG Environment Variables.
  • bin — This directory contains the WarehousePG management utilities. This directory also contains the PostgreSQL client and server programs, most of which are also used in WarehousePG.
  • docs/cli_help — This directory contains help files for WarehousePG command-line utilities.
  • docs/cli_help/gpconfigs — This directory contains sample gpinitsystem configuration files and host files that can be modified and used when installing and Initializing WarehousePG.
  • ext — Bundled programs (such as Python) used by some WarehousePG utilities.
  • include — The C header files for WarehousePG.
  • lib — WarehousePG and PostgreSQL library files.
  • sbin — Supporting/Internal scripts and programs.
  • share — Shared files for WarehousePG.

Next Steps ​