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

["Freeman Fang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KARAF-4281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Freeman Fang resolved KARAF-4281.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 4.0.5
                   4.1.0

patch applied on behalf of Luca Burgazzoli with thanks


> 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
>            Assignee: Freeman Fang
>            Priority: Minor
>             Fix For: 4.1.0, 4.0.5
>
>
> 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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