This is an end-to-end recipe for installing OmniSci Open Source on a CentOS/RHEL 7 machine using a tarball.
Here is a quick video overview of the installation process.
The order of these instructions is significant. To avoid problems, install each component in the order presented.
These instructions assume the following:
You are installing on a “clean” CentOS/RHEL 7 host machine with only the operating system installed.
Your OmniSci host only runs the daemons and services required to support OmniSci.
Your OmniSci host is connected to the Internet.
Prepare your CentOS/RHEL 7 machine by updating the system, installing the Java Development Kit, and creating a OmniSci user.
Update and Reboot
Update the entire system and reboot to activate the latest kernel.
sudo yum update
Follow these instructions to install a headless JDK and configure an environment variable with a path to the library. The “headless” Java Development Kit does not provide support for keyboard, mouse, or display systems. It has fewer dependencies, and is best suited for a server host. For more information, see http://openjdk.java.net/.
Open a terminal on the host machine.
Install the headless JDK using the following command:
sudo yum install java-1.8.0-openjdk-headless
Create the OmniSci User
Create a group called omnisci and a user named omnisci, who will be the owner of the OmniSci database. You can create the group, user, and home directory using the useradd command with the -U and -m switches.
sudo useradd -U -m omnisci
These instructions follow conventions of the OmniSci Engineering team. By creating an omnisci-installs directory and using a symbolic link that points to the current version, you can conveniently roll back to a previous version in the unlikely event that you would want to do so.
Create the omnisci-installs Directory
Use the following command to create the /opt/omnisci-installs directory.
sudo mkdir /opt/omnisci-installs
Download the OmniSci Archive File
You can download the OmniSci archive file using curl, or wget.
To download the OmniSci archive file with curl, use the following command.
These are the steps to prepare your OmniSci environment.
Set Environment Variables
For convenience, you can update .bashrc with the required environment variables.
Open a terminal window.
Enter cd ~/ to go to your home directory.
Open .bashrc in a text editor. For example, vi .bashrc.
Edit the .bashrc file. Add the following export commands under "User specific aliases and functions."
# User specific aliases and functions
Save the .bashrc file. For example, in vi, type [esc]:x!
Open a new terminal window to use your changes.
The $OMNISCI_STORAGE directory must be dedicated to OmniSci: do not set it to a directory shared by other packages.
Run the systemd installer.
You are prompted for two paths during install: OMNISCI_PATH and OMNISCI_STORAGE. OMNISCI_PATH must be the same as the location and the environment variable you created earlier. In a standard installation, that path is /opt/omnisci. OMNISCI_STORAGE defaults to /var/lib/omnisci
The script creates a data directory in $OMNISCI_STORAGE with the directories mapd_catalogs, mapd_data, and mapd_export. mapd_import and mapd_log directories are created when you insert data the first time. If you are an OmniSci administrator, the mapd_log directory is of particular interest.
Start and use OmniSciDB.
sudo systemctl start omnisci_server
Enable OmniSciDB to start automatically when the system reboots.
sudo systemctl enable omnisci_server
To verify that everything is working correctly, load some sample data and perform an omnisql query.
OmniSci ships with two sample datasets of airline flight information collected in 2008, and a dataset for the 2015 New York City Tree Census. To install the sample data, run the following command.
When prompted, choose whether to insert dataset 1, 2, or 3. The examples below use option 2, the smaller 10,000 row Flights dataset.