Ubuntu install Elasticsearch and elasticsearch-analysis-ik word segmentation

Install Elasticsearch and elasticsearch-analysis-ik on Ubuntu#

Assuming you have already installed JDK, if not, please check this article for Install JDK

Install Elasticsearch

Official document

1、 Download Elasticsearch

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.4.0.tar.gz

2、 Unzip

tar -xzf elasticsearch-6.4.0.tar.gz

3.、 start up

cd elasticsearch-6.4.0/./bin/elasticsearch  

Or run as a daemon#

. /bin/elasticsearch -d -p pid

Elasticsearch will run on the default port 9200

curl localhost:9200

Possible problems:

1、 Use a non-root user to start ES, and the user's file permissions are insufficient and the execution is refused

Java HotSpot(TM)64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.[2018-09-01T08:41:24,515][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler][] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
  at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:140)~[elasticsearch-6.4.0.jar:6.4.0]
  at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127)~[elasticsearch-6.4.0.jar:6.4.0]
  at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)~[elasticsearch-6.4.0.jar:6.4.0]
  at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124)~[elasticsearch-cli-6.4.0.jar:6.4.0]
  at org.elasticsearch.cli.Command.main(Command.java:90)~[elasticsearch-cli-6.4.0.jar:6.4.0]
  at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93)~[elasticsearch-6.4.0.jar:6.4.0]
  at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86)~[elasticsearch-6.4.0.jar:6.4.0]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
  at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:104)~[elasticsearch-6.4.0.jar:6.4.0]
  at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:171)~[elasticsearch-6.4.0.jar:6.4.0]
  at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:326)~[elasticsearch-6.4.0.jar:6.4.0]
  at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136)~[elasticsearch-6.4.0.jar:6.4.0]...6 more

Solution:

sudo chown -R vagrant:vagrant /var/elasticsearch-6.4.0

Restart

. /bin/elasticsearch -d

Check if it is activated

curl localhost:9200

If the following format is returned, the installation has started successfully

{" name":"iK2w1Zv","cluster_name":"elasticsearch","cluster_uuid":"u8XYlB1ZQACw0b1W0MA0Pw","version":{"number":"6.4.0","build_flavor":"default","build_type":"tar","build_hash":"595516e","build_date":"2018-08-17T23:18:47.308994Z","build_snapshot":false,"lucene_version":"7.4.0","minimum_wire_compatibility_version":"5.6.0","minimum_index_compatibility_version":"5.0.0"},"tagline":"You Know, for Search"}

1. Text file busy Could not rename log file 'logs/gc.log' to 'logs/gc.log.03' (Text file busy)
   Solution:

Find out the process occupying the file:

sudo fuser filename

Kill the process occupying the file

sudo kill -9 process id

Install elasticsearch-analysis-ik word segmentation##

Official document

The version of Elasticsearch we installed is 6.4.0, and the matching version number of this version is also 6.4.0. If you copy the document address, the following error may be reported:

Exception in thread "main" java.lang.IllegalArgumentException: Plugin [analysis-ik] was built for Elasticsearch version 6.3.0 but version 6.4.0 is running
  at org.elasticsearch.plugins.PluginsService.verifyCompatibility(PluginsService.java:339)
  at org.elasticsearch.plugins.InstallPluginCommand.loadPluginInfo(InstallPluginCommand.java:717)
  at org.elasticsearch.plugins.InstallPluginCommand.installPlugin(InstallPluginCommand.java:792)
  at org.elasticsearch.plugins.InstallPluginCommand.install(InstallPluginCommand.java:775)
  at org.elasticsearch.plugins.InstallPluginCommand.execute(InstallPluginCommand.java:231)
  at org.elasticsearch.plugins.InstallPluginCommand.execute(InstallPluginCommand.java:216)
  at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)
  at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124)
  at org.elasticsearch.cli.MultiCommand.execute(MultiCommand.java:77)
  at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124)
  at org.elasticsearch.cli.Command.main(Command.java:90)
  at org.elasticsearch.plugins.PluginCli.main(PluginCli.java:47)

So go to here to copy the link address of 6.4.0

installation

. /bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.4.0/elasticsearch-analysis-ik-6.4.0.zip

Restart elasticsearch

. /bin/elasticsearch -d

Check the effect:

curl -H 'Content-Type: application/json'-XGET 'localhost:9200/_analyze?
pretty' -d '{"analyzer":"ik_max_word","text":"He Deqiang"}'

If it is normal, the following content will be returned:

{" tokens":[{"token":"Congratulate","start_offset":0,"end_offset":1,"type":"CN_CHAR","position":0},{"token":"Morality","start_offset":1,"end_offset":2,"type":"CN_CHAR","position":1},{"token":"Strong","start_offset":2,"end_offset":3,"type":"CN_CHAR","position":2}]}