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

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.

cd $HEAVYAI_PATH/systemd
sudo ./install_heavy_systemd.sh

The install_heavy_systemd.sh script asks for the information described in the following table.

Starting HeavyDB Using systemd

To manually start HeavyDB using systemd, run:

sudo systemctl start heavydb
sudo systemctl start heavy_web_server

Restarting HeavyDB Using systemd

You can use systemd to restart HeavyDB — for example, after making configuration changes:

sudo systemctl restart heavydb
sudo systemctl restart heavy_web_server

Stopping HeavyDB Using systemd

To manually stop HeavyDB using systemd, run:

sudo systemctl stop heavydb
sudo systemctl stop heavy_web_server

Enabling HeavyDB on Startup

To enable the HeavyDB services to start on restart, run:

sudo systemctl enable heavydb
sudo systemctl enable heavy_web_server

Using Configuration Parameters

You can customize the behavior of your HEAVY.AI servers by modifying your heavy.conf configuration file. See Configuration Parameters.

HeavyDB includes the utilities initdb for database initialization and generate_cert for generating certificates and private keys for an HTTPS server.

initdb

Before using HeavyDB, initialize the data directory using initdb:

initdb [-f | --skip-geo] $HEAVYAI_BASE/storage

This creates three subdirectories:

• catalogs: Stores HeavyDB catalogs

• data: Stores HeavyDB data

• log: Contains all HeavyDB log files.

• disk_cache: Stores the data cached by HEAVY COnnect

The -f flag forces initdb to overwrite existing data and catalogs in the specified directory.

By default, initdb adds a sample table of geospatial data. Use the --skip-geo flag if you prefer not to load sample geospatial data.

generate_cert

generate_cert [{-ca} <bool>]
              [{-duration} <duration>]
              [{-ecdsa-curve} <string>]
              [{-host} <host1,host2>]
              [{-rsa-bits} <int>]
              [{-start-date} <string>]

This command generates certificates and private keys for an HTTPS server. The options are:

• [{-ca} <bool>]: Whether this certificate should be its own Certificate Authority. The default is false.

• [{-duration} <duration>]: Duration that the certificate is valid for. The default is 8760h0m0s.

• [{-ecdsa-curve} <string>]: ECDSA curve to use to generate a key. Valid values are P224, P256, P384, P521.

• [{-host} <string>]: Comma-separated hostnames and IPs to generate a certificate for.

• [{-rsa-bits} <int>]: Size of RSA key to generate. Ignored if –ecdsa-curve is set. The default is 2048.

• [{-start-date} <string>]: Start date formatted as Jan 1 15:04:05 2011