Using Services
HEAVY.AI features two system services: heavydb
and heavy_web_server
. You can start these services individually using systemd
.
Starting and Stopping HeavyDB Using systemd
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 the Troubleshooting and Monitoring Solutions section of our knowledgebase.
Initial Setup
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.
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. |
Starting HeavyDB Using systemd
systemd
To manually start HeavyDB using systemd
, run:
Restarting HeavyDB Using systemd
systemd
You can use systemd
to restart HeavyDB — for example, after making configuration changes:
Stopping HeavyDB Using systemd
systemd
To manually stop HeavyDB using systemd
, run:
Enabling HeavyDB on Startup
To enable the HeavyDB services to start on restart, run:
Using Configuration Parameters
You can customize the behavior of your HEAVY.AI servers by modifying your heavy.conf configuration file. See Configuration Parameters.
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