Elasticsearch: Difference between revisions
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=External= | |||
* https://www.elastic.co/products/elasticsearch | |||
=Internal= | =Internal= | ||
* [[System_Design#Search_Index|System Design]] | * [[System_Design#Search_Index|System Design]] | ||
* [[Media_Wiki_CirrusSearch|MediaWiki CirrusSearch]] | |||
* [[Elastic Stack#Overview|Elastic Stack]] | |||
* [[Logstash#Overview|Logstash]] | |||
* [[Kibana#Overview|Kibana]] | |||
* [[Beats#Overview|Beats]] | |||
=Overview= | |||
ElasticSearch is an open source, object store and a distributed search and analytics engine. It comes with a developer-friendly query language covering structured, unstructured and time-series data. By default, ElasticSearch uses TCP port 9300. | |||
=Installation= | =Installation= | ||
For pre-7 versions, Java must be installed as a prerequisite and <code>JAVA_HOME</code> set in the <code>root</code>'s environment in <code>/etc/profile.d/java.sh</code>. See: {{Internal|Bash_Configuration_Files#Setting_Configuration_for_all_Users.2C_Including_root|Setting Configuration for all Users, Including <tt>root</tt>}} | |||
For 7 and newer, Java is embedded. | |||
Corretto 11 seems to be working with with Elasticsearch 6.8.x. | |||
Download the latest RPM from https://www.elastic.co/guide/en/elasticsearch/reference/current/install-elasticsearch.html → Install Electric Search with RPM → https://www.elastic.co/guide/en/elasticsearch/reference/current/rpm.html | |||
<syntaxhighlight lang='bash'> | |||
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.8.20.rpm | |||
sudo rpm --install elasticsearch-6.8.20.rpm | |||
</syntaxhighlight> | |||
Set up Java home in <code>/etc/sysconfig/elasticsearch</code>: | |||
<syntaxhighlight lang='bash'> | |||
JAVA_HOME=/opt/java | |||
</syntaxhighlight> | |||
Also, correlate the amount of RAM available with -Xmx (<font color=darkgray>Maybe the installation script does it automatically?</font>). | |||
Enable start at boot. As root: | |||
<syntaxhighlight lang='bash'> | |||
systemctl daemon-reload | |||
systemctl enable elasticsearch.service | |||
systemctl start elasticsearch | |||
systemctl status elasticsearch | |||
</syntaxhighlight> | |||
Reboot and smoke test: | |||
<syntaxhighlight lang='bash'> | |||
curl http://localhost:9200/ | |||
{ | |||
"name" : "pkb.local", | |||
"cluster_name" : "elasticsearch", | |||
"cluster_uuid" : "37KaoJd3Q6qyBJSU0-7eQw", | |||
"version" : { | |||
"number" : "7.15.2", | |||
"build_flavor" : "default", | |||
"build_type" : "rpm", | |||
"build_hash" : "93d5a7f6192e8a1a12e154a2b81bf6fa7309da0c", | |||
"build_date" : "2021-11-04T14:04:42.515624022Z", | |||
"build_snapshot" : false, | |||
"lucene_version" : "8.9.0", | |||
"minimum_wire_compatibility_version" : "6.8.0", | |||
"minimum_index_compatibility_version" : "6.0.0-beta1" | |||
}, | |||
"tagline" : "You Know, for Search" | |||
} | |||
</syntaxhighlight> | |||
=Configuration= | |||
{{External|https://www.elastic.co/guide/en/elasticsearch/reference/current/rpm.html#rpm-configuring}} | |||
<code>/etc/elasticsearch/elasticsearch.yml</code> | |||
=Operations= | |||
==Layout== | |||
{{External|https://www.elastic.co/guide/en/elasticsearch/reference/current/rpm.html#rpm-layout}} | |||
<code>$ES_HOME</code>: <code>/usr/share/elasticsearch</code> | |||
State: <code>/var/lib/elasticsearch</code> | |||
==Start/Stop== | |||
<syntaxhighlight lang='bash'> | |||
systemctl stop elasticsearch.service | |||
systemctl start elasticsearch.service | |||
</syntaxhighlight> | |||
==Logs== | |||
<code>/var/log/elasticsearch/</code> | |||
==Queries== | |||
===Indices=== | |||
<syntaxhighlight lang='bash'> | |||
curl http://localhost:9200/_cat/indices?v | |||
</syntaxhighlight> | |||
<syntaxhighlight lang='bash'> | |||
curl http://localhost:9200/_cat/aliases?h=a | |||
</syntaxhighlight> | |||
====Interact with an Index==== | |||
<font size=-1> | |||
curl http://localhost:9200/<''index-name''>/ | |||
curl http://localhost:9200/<''index-name''>/_count | |||
</font> | |||
=ElasticSearch and OpenShift= | |||
{{Internal|ElasticSearch and OpenShift|ElasticSearch and OpenShift}} | |||
Latest revision as of 04:36, 22 November 2021
External
Internal
Overview
ElasticSearch is an open source, object store and a distributed search and analytics engine. It comes with a developer-friendly query language covering structured, unstructured and time-series data. By default, ElasticSearch uses TCP port 9300.
Installation
For pre-7 versions, Java must be installed as a prerequisite and JAVA_HOME set in the root's environment in /etc/profile.d/java.sh. See:
For 7 and newer, Java is embedded.
Corretto 11 seems to be working with with Elasticsearch 6.8.x.
Download the latest RPM from https://www.elastic.co/guide/en/elasticsearch/reference/current/install-elasticsearch.html → Install Electric Search with RPM → https://www.elastic.co/guide/en/elasticsearch/reference/current/rpm.html
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.8.20.rpm
sudo rpm --install elasticsearch-6.8.20.rpm
Set up Java home in /etc/sysconfig/elasticsearch:
JAVA_HOME=/opt/java
Also, correlate the amount of RAM available with -Xmx (Maybe the installation script does it automatically?).
Enable start at boot. As root:
systemctl daemon-reload
systemctl enable elasticsearch.service
systemctl start elasticsearch
systemctl status elasticsearch
Reboot and smoke test:
curl http://localhost:9200/
{
"name" : "pkb.local",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "37KaoJd3Q6qyBJSU0-7eQw",
"version" : {
"number" : "7.15.2",
"build_flavor" : "default",
"build_type" : "rpm",
"build_hash" : "93d5a7f6192e8a1a12e154a2b81bf6fa7309da0c",
"build_date" : "2021-11-04T14:04:42.515624022Z",
"build_snapshot" : false,
"lucene_version" : "8.9.0",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
},
"tagline" : "You Know, for Search"
}
Configuration
/etc/elasticsearch/elasticsearch.yml
Operations
Layout
$ES_HOME: /usr/share/elasticsearch
State: /var/lib/elasticsearch
Start/Stop
systemctl stop elasticsearch.service
systemctl start elasticsearch.service
Logs
/var/log/elasticsearch/
Queries
Indices
curl http://localhost:9200/_cat/indices?v
curl http://localhost:9200/_cat/aliases?h=a
Interact with an Index
curl http://localhost:9200/<index-name>/ curl http://localhost:9200/<index-name>/_count