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Installing Kapow!
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=================
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Kapow! has a reference implementation in Go that is under active develpment
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right now. If you want to start using Kapow! you can:
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- Download a binary (linux, at this moment) from our
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`releases <https://github.com/BBVA/kapow/releases>`_ section
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- Install the package with the get command (you need the Go runtime installed
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and `configured <https://golang.org/cmd/go/>`)
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Kapow! has a reference implementation in Go that is under active development
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right now. If you want to start using Kapow! you can choose from several
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options
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Download and install a binary
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-----------------------------
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Binaries for several platforms are availables from our
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`releases <https://github.com/BBVA/kapow/releases>`_ section, visit the latest
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release page and download the binary corresponding to the platfom and
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architecture you want to install Kapow! in.
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Linux
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^^^^^
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Install the downloaded binary using the following command as a privileged user.
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.. code-block:: bash
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install -t /usr/local/bin path_to_downloaded_binary
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Windows
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^^^^^^^
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Copy the downloaded binary to a directory of your choice and update the system
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PATH variable to include that directory.
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Install the package with go get
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-------------------------------
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If you already have `installed and configured <https://golang.org/cmd/go/>`_
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the go runtime in the host where you want to run Kapow!, simply run:
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.. code-block:: bash
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go get -u github.com/BBVA/kapow
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Using Kapow!
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============
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Kapow! binary gives you both, a way to start the server and a command line
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client to interact with it.
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Include Kapow! in your container image
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--------------------------------------
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Running the server
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------------------
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If you want to include Kapow! in a Docker image you can add the binary directly
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from the releases section. Following is an example dockerfile that includes
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Kapow!.
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You start a Kapow! server by using the server command ``kapow server``. It
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automatically binds the three HTTP modules when it starts:
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.. code-block:: dockerfile
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- The control server: Used to manage the user defined routes. It exposes the
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control API and listens by default in the loopback interface at port 8081. You
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can change this configurtation by ussing the
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--control-bind <listen_address>:<listen_port> parameter.
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- The data server: Allows access to the resources tree to the scripts triggered
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by user's requests. It exposes the control API and listens by default in the
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loopback interface at port 8082. You can change this configurtation by ussing
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the --data-bind <listen_address>:<listen_port> parameter.
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- The ``user server``: This server is the one that makes available to the
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outside all the routes configured through the control server. It listens by
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default in the port 8080 of all configured interfaces (0.0.0.0). You can change this
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configurtation by ussing the --bind <listen_address>:<listen_port> parameter.
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FROM debian:stretch-slim
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RUN apt-get update
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ADD https://github.com/BBVA/kapow/releases/download/<VERSION>/kapow_linux_amd64 /usr/bin/kapow
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********--------********--------********----------------********--------********--------********
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RUN chmod 755 /usr/bin/kapow
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You start a Kapow! server by using the server command ``kapow server``. You can
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configure the listen address of the different modules by using the
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corresponding parameters:
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ENTRYPOINT ["/usr/bin/kapow"]
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- --control-bind <listen_address>:<listen_port>: Allows to manage the user
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defined routes. Defaults to 'localhost:8081' (loopback interface).
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- --data-bind <listen_address>:<listen_port>: Allows access to the resources
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tree to the scripts triggered by user's requests. Defailts to 'localhost:8081'
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(loopback interface).
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- --bind <listen_address>:<listen_port>: Publishes the routes configured
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through the control server to the outside world. Defaults to '0.0.0.0:8080'
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(all configured host's interfaces.)
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Managing routes
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---------------
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Kapow!'s route command allows us to manage the routes that we want to publish
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to the outside world. In order to contact with the desired Kapow! server you
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can use the ``--control-url`` command line parameter or the KAPOW_CONTROL_URL
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environmental variable to set the correct value.
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In the same way the ``--data-url`` command line parameter or the KAPOW_DATA_URL
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environmental variable will allow you to set to set the server listen address
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when accesing the data server, although this case is less frequent.
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If the container is intended to run the server and you want to dinamically
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configure it, remember to include a --contorl-bind param with an external bind
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address (i.e. 0.0.0.0) and to map all the needed ports in order to get access
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to the control interfgace.
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