50 lines
2.4 KiB
Markdown
50 lines
2.4 KiB
Markdown
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<!---
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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# apache_hbase clusterdock topology
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## Overview
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*clusterdock* is a framework for creating Docker-based container clusters. Unlike regular Docker
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containers, which tend to run single processes and then exit once the process terminates, these
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container clusters are characterized by the execution of an init process in daemon mode. As such,
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the containers act more like "fat containers" or "light VMs;" entities with accessible IP addresses
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which emulate standalone hosts.
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*clusterdock* relies upon the notion of a topology to define how clusters should be built into
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images and then what to do with those images to start Docker container clusters.
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## Usage
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The *clusterdock* framework is designed to be run out of its own container while affecting
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operations on the host. To avoid problems that might result from incorrectly
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formatting this framework invocation, a Bash helper script (`clusterdock.sh`) can be sourced on a
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host that has Docker installed. Afterwards, running any of the binaries intended to carry
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out *clusterdock* actions can be done using the `clusterdock_run` command.
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```
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wget https://raw.githubusercontent.com/cloudera/clusterdock/master/clusterdock.sh
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# ALWAYS INSPECT SCRIPTS FROM THE INTERNET BEFORE SOURCING THEM.
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source clusterdock.sh
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```
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Since the *clusterdock* framework itself lives outside of Apache HBase, an environmental variable
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is used to let the helper script know where to find an image of the *apache_hbase* topology. To
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start a four-node Apache HBase cluster with default versions, you would simply run
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```
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CLUSTERDOCK_TOPOLOGY_IMAGE=apache_hbase_topology_location clusterdock_run \
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./bin/start_cluster apache_hbase --secondary-nodes='node-{2..4}'
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```
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