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This is documentation for Caché & Ensemble.

For information on converting to InterSystems IRIS, see the InterSystems IRIS Adoption Guide and the InterSystems IRIS In-Place Conversion Guide, both available on the WRC Distributions page (login required).

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Starting the ISCAgent on Linux Systems

Starting the ISCAgent on Linux Systems

On Linux systems supporting systemd (such as SUSE Linux Enterprise Server 12, SP1 or later), the /etc/systemd/system/ISCAgent.service file is installed, providing support for management of the ISCAgent using systemd. On any such system, the following commands can be used to start, stop and display the status of the ISCAgent:

systemctl start ISCAgent.service
systemctl stop ISCAgent.service
systemctl status ISCAgent.service
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To control whether the ISCAgent starts on system boot on a system that supports systemd, use the following commands:

sudo systemctl enable ISCAgent.service
sudo systemctl disable ISCAgent.service
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By default, systemd services are disabled. You can use systemctl to start and stop the service on demand, even when it is disabled.

The ISCAgent.service file does not read the location of the Caché registry and shared support files from the CACHESYS environment variable (see Caché Installation Directory in the preface of the Caché Installation Guide), but instead is installed with /usr/local/etc/cachesys as the location. You can edit ISCAgent.service to specify a different registry directory if required.

On all Linux systems, the ISCAgent start/stop script described in Starting the ISCAgent on UNIX® and Mac OS X Systems is installed in /etc/init.d/ISCAgent. If systemd is not supported, use the commands described in that section to start and stop the ISCAgent.

The remainder of the information provided in Starting the ISCAgent on UNIX® and Mac OS X Systems also applies to Linux systems supporting systemd.

Important:

Although it is possible to use either the systemctl commands or the /etc/init.d/ISCAgent script on a Linux system that supports systemd, you must choose one method and use it exclusively, without switching back and forth. The ISCAgent should always be stopped using the method with which it was started.

When you upgrade Caché on such a Linux system, a running ISCAgent is automatically restarted using systemd. If you are using the /etc/init.d/ISCAgent script to manage the ISCAgent, stop the agent before performing the upgrade so that it is not automatically restarted, then restart it using the script after the upgrade.

When changing from using the /etc/init.d/ISCAgent script to using systemctl commands, before starting the agent with systemctl for the first time, do the following as root:

  1. Run the command the following command:

    systemctl status ISCAgent
    
  2. If the output from the command contains this warning:

    Warning: Unit file changed on disk, 'systemctl daemon-reload' recommended.
    

    run the following command:

    systemctl daemon-reload
    
  3. When the previous command has completed, run systemctl status ISCAgent again to confirm that the warning does not appear.

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