[jira] [Created] (KARAF-4281) System scripts: provide Systemd templates to manage Karaf child instances

["Luca Burgazzoli (JIRA)" <ji...@apache.org>]

Luca Burgazzoli created KARAF-4281:
--------------------------------------

             Summary: System scripts: provide Systemd templates to manage Karaf child instances
                 Key: KARAF-4281
                 URL: https://issues.apache.org/jira/browse/KARAF-4281
             Project: Karaf
          Issue Type: New Feature
          Components: karaf-os-integration
            Reporter: Luca Burgazzoli
            Priority: Minor


Systemd's has as  a sort of template-engine for unit files which are defined in the form of template-name@.service, i.e. for karaf I've created one named karaf@.service with content like:

{code}
  [Unit]
  Description=Karaf - %i
  After=syslog.target network.target

  [Service]
  EnvironmentFile=-/etc/karaf/karaf.conf
  Environment=JAVA_HOME=/opt/java/1.8.0
  Environment=KARAF_HOME=/opt/apache/karaf-4
  Environment=KARAF_BASE=/opt/apache/karaf-4/instances/%i

  ExecStart=/opt/apache/karaf-4/bin/karaf daemon
  ExecStop=/opt/apache/karaf-4/bin/karaf stop

  LimitNOFILE=102642

  [Install]
  WantedBy=multi-user.target
{code}

With such configuration, you do not need to create a systemd unit file for each child instance but you can leverage karaf@.service, i.e:

{code}
  systemctl start karaf@instance-1
{code}

A service created in such way can also be configured to auto-start at boot like any other Systemd unit:

{code}
  [lb@home]# systemctl enable karaf@instance-1
  Created symlink from /etc/systemd/system/multi-user.target.wants /karaf@instance-1.service to /etc/systemd/system/karaf@.service. 
{code}



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