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The purpose is to simplify the features installation and lifecycle.
The new resolver now checks the feature requirements (defined directly in the features XML), and check which bundles provides the capabilities to satisfy these requirements.
Only the core layer is packaged, most of the features and bundles are downloaded from Internet at bootstrap.
It means that Apache Karaf minimal distribution requires an Internet connection to start correctly.
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It also supports the "run anywhere" (on any machine with Java, cloud, docker images, …) using the embedded mode. SYNTAX bundle:list [options] [ids] ARGUMENTS ids The list of bundle (identified by IDs or name or name/version) separated by whitespaces OPTIONS -name, -n Show bundle name -u Shows the update locations -r Shows the bundle revisions --no-ellipsis -l Show the locations -s Shows the symbolic name --context, -c Use the given bundle context (defaults to 0) --help Display this help message -t Specifies the bundle threshold; bundles with a start-level less than this value will not get printed out.The features provided by the "minimal" distribution are exactly the same as in the "default" distribution, the difference is that the minimal distribution will download the features from Internet.folder contains all the working and temporary files for Karaf.If you want to restart from a clean state, you can wipe out this directory, which has the same effect as using the clean option to the Karaf start.
Even if you start Apache Karaf without the console (using server or background modes), you can connect to the console. It means that you can access to Karaf console remotely.
You may wish to tweak the JVM properties in the wrapper configuration file: /opt/apache-karaf-4.0.0/etc/before installing and starting the service.