ElasticSearch 2 (2)

ElasticSearch 2.1.1 (2) - Setup

Installation

• Elasticsearch can be started using:

    $ bin/elasticsearch
  

• Running as a daemon

    $ bin/elasticsearch -d
  

• PID

  The PID is written to a file called pid.

    $ bin/elasticsearch -d -p pid 
  

  The kill command sends a TERM signal to the PID stored in the pid file.

    $ kill `cat pid` 	
  

  Another feature is the ability to pass -D or getopt long style configuration parameters directly to the script. When set, all override anything set using either JAVA_OPTS or ES_JAVA_OPTS. For example:

    $ bin/elasticsearch -Des.index.refresh_interval=5s --node.name=my-node
  

Configuration

Environment Variables

• JAVA_OPTS

• ES_JAVA_OPTS > JAVA_OPTS

• ES_HEAP_SIZE

    ES_MIN_MEM (defaults to 256m)	
    ES_MAX_MEM (defaults to 1g)
  

  It is recommended to set the min and max memory to the SAME value, and enable mlockall.

System Configuration

• File Descriptors

  Setting it to 32k or even 64k is recommended.

    -Des.max-open-files=true
  

  max_file_descriptors

    curl localhost:9200/_nodes/stats/process?pretty
  

• Virtual memory

  Elasticsearch uses a hybrid mmapfs / niofs directory by default to store its indices. The default operating system limits on mmap counts is likely to be too low, which may result in out of memory exceptions. On Linux, you can increase the limits by running the following command as root:

    sysctl -w vm.max_map_count=262144
  

  To set this value permanently, update the vm.max_map_count setting in /etc/sysctl.conf.

• Memory Settings

  Most operating systems try to use as much memory as possible for file system caches and eagerly swap out unused application memory, possibly resulting in the elasticsearch process being swapped. Swapping is very bad for performance and for node stability, so it should be avoided at all costs.

  • Disable swap

    • Box -

      ES_HEAP_SIZE

    • Linux -

      Temporarily

        sudo swapoff -a
      

      Permanently (comment out swap)

        /etc/fstab
      

    • Windows -

      System Properties → Advanced → Performance → Advanced → Virtual memory

  • Configure swappiness

    This reduces the kernel’s tendency to swap and should not lead to swapping under normal circumstances, while still allowing the whole system to swap in emergency conditions.

      vm.swappiness
    

    From kernel version 3.5-rc1 and above, a swappiness of 0 will cause the OOM killer to kill the process instead of allowing swapping. You will need to set swappiness to 1 to still allow swapping in emergencies.

  • mlockall

    • Linux - mlockall

        bootstrap.mlockall: true
      

    • Windows - VirtualLock

    Check:

      curl http://localhost:9200/_nodes/process?pretty				
    

    Grant(as root):

      $ ulimit -l unlimited 					
    

    Directory(/tmp):

      ./bin/elasticsearch -Djna.tmpdir=/path/to/new/dir	
    

    mlockall might cause the JVM or shell session to exit if it tries to allocate more memory than is available!

Elasticsearch Settings

• Directory

    ES_HOME/config
  

  • module - elasticsearch.yml

  • logging - logging.yml

  • network

    The address all network based modules will use to bind and publish to:

      network :
          host : 10.0.0.4
    

• Path

    path:
    	logs: /var/log/elasticsearch
    	data: /var/data/elasticsearch
  

• Cluster name

  Don’t forget to give your production cluster a name, which is used to discover and auto-join other nodes:

    cluster:
    	name: <NAME OF YOUR CLUSTER>
  

  Don’t reuse the same cluster names in different environment

  • development: logging-dev
  • staging: logging-stage
  • production: logging-prod

• Node name

  • Default (Marvel Character Name)

  • Provided

      node:
        name: <NAME OF YOUR NODE>
    

  • Single Node on Machine

      node:
        name: ${HOSTNAME}				
    

• Configuration style

  • JSON

    elasticsearch.json:

      {
      	"network" : {
      		"host" : "10.0.0.4"
      	}
      }	
    

  • Command

      $ elasticsearch -Des.network.host=10.0.0.4
    

  • Default

      es.default.			
    

  • Environment

      {
         "network" : {
          	"host" : "${ES_NET_HOST}"
      	}
      }
    

  • Non-store

    ${prompt.text} or ${prompt.secret}

      node:
        name: ${prompt.text}				
    

    On execution:

      Enter value for [node.name]:		
    

    Elasticsearch will not start if ${prompt.text} or ${prompt.secret} is used in the settings and the process is run as a service or in the background.

Index Settings

• Index Level (YAML or JSON)

    $ curl -XPUT http://localhost:9200/kimchy/ -d 
    '
    	index:
        refresh_interval: 5s
    '
  

• Node Level (elasticsearch.yml)

    index :
    	refresh_interval: 5s
  

• Collapsed

    $ elasticsearch -Des.index.refresh_interval=5s
  

Logging

• Log4j (log4j-extras)

• Format

  • .yml
  • .yaml
  • .json
  • .properties

• Deprecation

  config/logging.yml

    deprecation: DEBUG, deprecation_log_file
  

Running as a Service on Linux

Linux

ES_USER

The user to run as, defaults to elasticsearch

ES_GROUP

The group to run as, defaults to elasticsearch

ES_HEAP_SIZE

The heap size to start with

ES_HEAP_NEWSIZE

The size of the new generation heap

ES_DIRECT_SIZE

The maximum size of the direct memory

MAX_OPEN_FILES

Maximum number of open files, defaults to 65535

MAX_LOCKED_MEMORY

Maximum locked memory size. Set to "unlimited" if you use the bootstrap.mlockall option in elasticsearch.yml. You must also set ES_HEAP_SIZE.

MAX_MAP_COUNT

Maximum number of memory map areas a process may have. If you use mmapfs as index store type, make sure this is set to a high value. For more information, check the linux kernel documentation about max_map_count. This is set via sysctl before starting elasticsearch. Defaults to 65535

LOG_DIR

Log directory, defaults to /var/log/elasticsearch

DATA_DIR

Data directory, defaults to /var/lib/elasticsearch

CONF_DIR

Configuration file directory (which needs to include elasticsearch.yml and logging.yml files), defaults to /etc/elasticsearch

ES_JAVA_OPTS

Any additional java options you may want to apply. This may be useful, if you need to set the node.name property, but do not want to change the elasticsearch.yml configuration file, because it is distributed via a provisioning system like puppet or chef. Example: ES_JAVA_OPTS="-Des.node.name=search-01"

RESTART_ON_UPGRADE

Configure restart on package upgrade, defaults to false. This means you will have to restart your elasticsearch instance after installing a package manually. The reason for this is to ensure, that upgrades in a cluster do not result in a continuous shard reallocation resulting in high network traffic and reducing the response times of your cluster.

ES_GC_LOG_FILE

The absolute log file path for creating a garbage collection logfile, which is done by the JVM. Note that this logfile can grow pretty quick and thus is disabled by default.

Debian/Ubuntu

• runlevels

  update-rc.d

• init script

  /etc/init.d/elasticsearch

• configuration

  /etc/default/elasticsearch

• after install

    dpkg -i	
  

• start on boot and start up

    sudo update-rc.d elasticsearch defaults 95 10
    sudo /etc/init.d/elasticsearch start
  

Oracle JDK

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
java -version

RPM based distribution

• Using chkconfig

  • init script

    /etc/init.d/elasticsearch

  • configuration

    /etc/sysconfig/elasticsearch

  • manual start

      sudo /sbin/chkconfig --add elasticsearch
      sudo service elasticsearch start
    

• Using systemd

  • system rpm based

    /etc/default/elasticsearch

  • configuration

    /etc/sysconfig/elasticsearch

  • up

      sudo /bin/systemctl daemon-reload
      sudo /bin/systemctl enable elasticsearch.service
      sudo /bin/systemctl start elasticsearch.service
    

  • MAX_MAP_COUNT setting

    /etc/sysconfig/elasticsearch (no effect)

    /usr/lib/sysctl.d/elasticsearch.conf

Running as a Service on Windows

https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-service-win.html

Directory Layout

• Type(Setting) - Default Location

  Description

• home(path.home) - N/A

  Home of elasticsearch installation.

• bin(N/A) - {path.home}/bin

  Binary scripts including elasticsearch to start a node.

• conf(path.conf) - {path.home}/config

  Configuration files including elasticsearch.yml

• data(path.data) - {path.home}/data

  The location of the data files of each index / shard allocated on the node. Can hold multiple locations.

• logs(path.logs) - {path.home}/logs

  Log files location.

• plugins(path.plugins) - {path.home}/plugins

  Plugin files location. Each plugin will be contained in a subdirectory.

• repo(path.repo) - Not configured

  Shared file system repository locations. Can hold multiple locations. A file system repository can be placed in to any subdirectory of any directory specified here.

• script(path.script) - {path.conf}/scripts

  Location of script files.

Multiple data paths

---------------------------------
path.data: /mnt/first,/mnt/second
---------------------------------

Or array format

----------------------------------------
path.data: ["/mnt/first", "/mnt/second"]
----------------------------------------    

To stripe shards across multiple disks, please use a RAID driver instead.

Default Path

• deb & rpm

    -----------------------------------------------------------------------------------
        Type    | Location Debian/Ubuntu            | Location RHEL/CentOS
    -----------------------------------------------------------------------------------
        home    | /usr/share/elasticsearch          | /usr/share/elasticsearch
    -----------------------------------------------------------------------------------
        bin     | /usr/share/elasticsearch/bin      | /usr/share/elasticsearch/bin
    -----------------------------------------------------------------------------------
        conf    | /etc/elasticsearch                | /etc/elasticsearch
    -----------------------------------------------------------------------------------
        conf    | /etc/default/elasticsearch        | /etc/sysconfig/elasticsearch
    -----------------------------------------------------------------------------------
        data    | /var/lib/elasticsearch/data       | /var/lib/elasticsearch
    -----------------------------------------------------------------------------------
        logs    | /var/log/elasticsearch            | /var/log/elasticsearch
    -----------------------------------------------------------------------------------
        plugins | /usr/share/elasticsearch/plugins  | /usr/share/elasticsearch/plugins
    -----------------------------------------------------------------------------------
        repo    | Not configured                    | Not configured
    -----------------------------------------------------------------------------------
        script  | /etc/elasticsearch/scripts        | /etc/elasticsearch/scripts
    -----------------------------------------------------------------------------------
  

• zip

    -----------------------------------------------------------------------------------
        Type    | Description                                   | Location
    -----------------------------------------------------------------------------------    
        home    | Home of elasticsearch installation            | {extract.path}
    -----------------------------------------------------------------------------------     
        bin     | scripts to start a node                       | {extract.path}/bin
    -----------------------------------------------------------------------------------     
        conf    | files elasticsearch.yml and logging.yml       | {extract.path}/config
    -----------------------------------------------------------------------------------     
        data    | location of files of each index / shard       | {extract.path}/data
    -----------------------------------------------------------------------------------     
        logs    | Log files location                            | {extract.path}/logs
    -----------------------------------------------------------------------------------     
        plugins | Plugin files location.                        | {extract.path}/plugins
    -----------------------------------------------------------------------------------     
        repo    | Shared file system repository locations.      | Not configured
    -----------------------------------------------------------------------------------                 
        script  | Location of script files.                     | {extract.path}/config/scripts
    -----------------------------------------------------------------------------------      
  

Repositories

PGP Key

We use the PGP key D88E42B4, Elasticsearch Signing Key, with fingerprint

4609 5ACC 8548 582C 1A26 99A9 D27D 666C D88E 42B4

APT

Download and install the Public Signing Key:

wget -qO - https://packages.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -

Save the repository definition to /etc/apt/sources.list.d/elasticsearch-2.x.list:

echo "deb http://packages.elastic.co/elasticsearch/2.x/debian stable main" | sudo tee -a /etc/apt/sources.list.d/elasticsearch-2.x.list

Run apt-get update and the repository is ready for use. You can install it with:

sudo apt-get update && sudo apt-get install elasticsearch

Configure Elasticsearch to automatically start during bootup. If your distribution is using SysV init, then you will need to run:

sudo update-rc.d elasticsearch defaults 95 10

Otherwise if your distribution is using systemd:

sudo /bin/systemctl daemon-reload
sudo /bin/systemctl enable elasticsearch.service

YUM

Download and install the public signing key:

rpm --import https://packages.elastic.co/GPG-KEY-elasticsearch

Add the following in your /etc/yum.repos.d/ directory in a file with a .repo suffix, for example elasticsearch.repo

[elasticsearch-2.x]
name=Elasticsearch repository for 2.x packages
baseurl=http://packages.elastic.co/elasticsearch/2.x/centos
gpgcheck=1
gpgkey=http://packages.elastic.co/GPG-KEY-elasticsearch
enabled=1	

And your repository is ready for use. You can install it with:

yum install elasticsearch

• SysV init

    chkconfig --add elasticsearch
  

• Systemd

    sudo /bin/systemctl daemon-reload
    sudo /bin/systemctl enable elasticsearch.service
  

Reference

https://www.elastic.co/guide/en/elasticsearch/reference/current/setup.html