What is the use of Apache Karaf?

What is the use of Apache Karaf?

Apache Karaf is a modern polymorphic application container. Karaf can be used as a standalone container, supporting a wide range of applications and technologies. It also supports the “run anywhere” concept (on any machine with Java, cloud, docker images, … ​) using the embedded mode.

What is Karaf shell?

Overview. Karaf provides a powerful console and a set of commands that can be used to perform various tasks. Commands can be located in the root shell or in a sub-shell. A sub-shell is a group of related commands, like commands related to the OSGi framework or the log system.

What is Karaf cellar?

Manage bunch of clustered instances with Karaf Cellar Karaf Cellar is a clustering solution for Karaf. It allows you to manage multiple instances, with synchronization between the instances.

What is Karaf Java?

Karaf is a lightweight, powerful, and enterprise ready modulith runtime. It provides all the ecosystem and bootstrapping options you need for your applications. This modulith runtime supports several frameworks and different kind of applications: REST/API, Web, Spring Boot, and much more.

How do I run Karaf commands?

Cleaning the Karaf state Normally Karaf remembers the features and bundles you installed and started. To reset Karaf into a clean state, just delete the data directory when Karaf is not running. Summary.

What is Apache cellar?

Apache Karaf is a small OSGi based runtime which provides a lightweight container onto which various components and applications can be deployed. Cellar is a clustering solution for Apache Karaf powered by Hazelcast®.

How do I make a Karaf bundle?

This Example can be importet as Eclipse Projekt from github.

1. Step 1 – Download and extract karaf.
2. Step 2 – Create a new Eclipse Project.
3. Step 3 implement some Code.
4. Step 4 install the Bundle to your local Maven Repository.
5. Step 5 Install the Bundle to Karaf.
6. Step 6 Start the Bundle.
7. Step 7 Watch Karaf log.
8. Step 8 Watch Bundle.

What is a Nanoservice?

Nanoservice is an antipattern where a service is too fine-grained. A nanoservice is a service whose overhead (communications, maintenance, and so on) outweighs its utility. Like Steve and others, Arnon concludes that Microservices is just another name for SOA.

How to deploy a Karaf container?

Hot deployment: simply drop a file in the deploy directory, Apache Karaf will detect the type of the file and try to deploy it. Complete Console: Apache Karaf provides a complete Unix-like console where you can completely manage the container.

Where are Apache Karaf configuration files located?

All configuration files are centralized in the etc folder. Any change in a configuration file is noticed and reloaded. Advanced Logging System: Apache Karaf supports all the popular logging frameworks (slf4j, log4j, etc). Whichever logging framework you use, Apache Karaf centralizes the configuration in one file.

How to install Karaf into a very deep path?

In case you have to install Karaf into a very deep path or a path containing illegal characters for Java paths, e.g. !, % etc., you may add a bat file to start -> startup that executes. subst S: “C:your very % problematic path!KARAF”. so your Karaf root directory is S: — which works for sure and is short to type.

Which version of Karaf is compatible with Java8?

For the users upgrading from Karaf 2.x, please see the “Update Notes (from 2.x to 3.x)” in the Karaf 3.x documentation first. Karaf 4.x supports Java8. 3.1. Distributions Apache Karaf 4.x is available as tar.gz and zip archives. The content is the same and works on either Unix or Windows platforms. The bin folder contains both sh and bat scripts.