Setting up a node_ElasticSearch Cookbook-QQ阅读女生仙侠网

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Setting up a node

ElasticSearch allows you to customize several parameters in an installation. In this recipe, we'll see the most used ones to define where to store our data and to improve general performances.

Getting ready

You need a working ElasticSearch installation.

How to do it...

The steps required for setting up a simple node are as follows:

Open the config/elasticsearch.yml file with an editor of your choice.

Set up the directories that store your server data:

path.conf: /opt/data/es/conf
path.data: /opt/data/es/data1,/opt2/data/data2
path.work: /opt/data/work
path.logs: /opt/data/logs
path.plugins: /opt/data/plugins

Set up parameters to control the standard index creation. These parameters are:
```
index.number_of_shards: 5
index.number_of_replicas: 1
```

How it works...

The path.conf file defines the directory that contains your configuration: mainly elasticsearch.yml and logging.yml. The default location is $ES_HOME/config with ES_HOME your install directory.

Note

It's useful to set up the config directory outside your application directory so you don't need to copy configuration files every time you update the version or change the ElasticSearch installation directory.

The path.data file is the most important one: it allows defining one or more directories where you store index data. When you define more than one directory, they are managed similarly to a RAID 0 configuration (the total space is the sum of all the data directory entry points), favoring locations with the most free space.

The path.work file is a location where ElasticSearch puts temporary files.

The path.log file is where log files are put. The control how to log is managed in logging.yml.

The path.plugins file allows overriding the plugins path (default $ES_HOME/plugins). It's useful to put "system wide" plugins.

The main parameters used to control the index and shard is index.number_of_shards, that controls the standard number of shards for a new created index, and index.number_of_replicas that controls the initial number of replicas.

There's more...

There are a lot of other parameters that can be used to customize your ElasticSearch installation and new ones are added with new releases. The most important ones are described in this recipe and in the next one.