Using Services
HEAVY.AI features two system services:
heavydb and heavy_web_server. You can start these services individually using systemd.For permanent installations of HeavyDB, HEAVY.AI recommends that you use
systemd to manage HeavyDB services. systemd automatically handles tasks such as log management, starting the services on restart, and restarting the services if there is a problem.In addition,
systemd manages the open-file limit in Linux. Some cloud providers and distributions set this limit too low, which can result in errors as your HEAVY.AI environment and usage grow. For more information about adjusting the limits on open files, see Why am I seeing the error "Too many open files...erno24"? in Frequently Asked Questions.You use the
install_heavy_systemd.sh script to prepare systemd to run HEAVY.AI services. The script asks questions about your environment, then installs the systemd service files in the correct location. You must run the script as the root user so that the script can perform tasks such as creating directories and changing ownership.cd $HEAVYAI_PATH/systemd
sudo ./install_heavy_systemd.sh
The
install_heavy_systemd.sh script asks for the information described in the following table.Variable | Use | Default | Notes |
HEAVYAI_PATH | Path to HeavyDB installation directory | Current install directory | HEAVY.AI recommends heavyai as the install directory. |
HEAVYAI_BASE | Path to the storage directory for HeavyDB data and configuration files | heavyai | Must be dedicated to HEAVY.AI. The installation script creates the directory $HEAVYAI_STORAGE/data, generates an appropriate configuration file, and saves the file as $HEAVYAI_STORAGE/heavy.conf. |
HEAVYAI_USER | User HeavyDB is run as | Current user | User must exist before you run the script. |
HEAVYAI_GROUP | Group HeavyDB is run as | Current user's primary group | Group must exist before you run the script. |
To manually start HeavyDB using
systemd, run:sudo systemctl start heavydb
sudo systemctl start heavy_web_server
You can use
systemd to restart HeavyDB — for example, after making configuration changes:sudo systemctl restart heavydb
sudo systemctl restart heavy_web_server
To manually stop HeavyDB using
systemd, run:sudo systemctl stop heavydb
sudo systemctl stop heavy_web_server
To enable the HeavyDB services to start on restart, run:
sudo systemctl enable heavydb
sudo systemctl enable heavy_web_server
You can customize the behavior of your HEAVY.AI servers by modifying your heavy.conf configuration file. See Configuration Parameters.
Last modified 8mo ago