How To Install Elasticsearch On Centos7.6

Installation Of Elasticsearch On Centos 7.6

Elasticsearch is an open source, distributed full-text search engine based on the Lucene Library. It developed in Java. In This tutorial covers the basic installation process of Elasticsearch on CentOS 7.6

Installation process

ElasticSearch requires Java 8 for its functioning, so use the following command to install Java

[root@linuxhelp ~]# yum install java-1.8.0-openjdk.x86_64
BDB2053 Freeing read locks for locker 0xa2d: 17378/140593153771328
BDB2053 Freeing read locks for locker 0xa2f: 17378/140593153771328
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: centos.excellmedia.net
 * extras: centos.excellmedia.net
 * updates: centos.excellmedia.net
Resolving Dependencies
--> Running transaction check
.
.
.
Dependencies Resolved

=======================================================================================================
 Package                            Arch          Version                         Repository      Size
=======================================================================================================
Updating:
 java-1.8.0-openjdk                 x86_64        1:1.8.0.252.b09-2.el7_8         updates        295 k
Installing for dependencies:
Upgrade  1 Package  (+1 Dependent package)

Total size: 33 M
Total download size: 34 k
Is this ok [y/d/N]: y

Updated:
  java-1.8.0-openjdk.x86_64 1:1.8.0.252.b09-2.el7_8                                                    

Dependency Updated:
  java-1.8.0-openjdk-headless.x86_64 1:1.8.0.252.b09-2.el7_8                                           

Complete!

If you want to check the java version you’ve just installed by using the following command

[root@linuxhelp ~]# java -version
openjdk version "1.8.0_252"
OpenJDK Runtime Environment (build 1.8.0_252-b09)
OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)

You can download the package for ElasticSearch using the following command.

[root@linuxhelp ~]# wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.8.0-x86_64.rpm
--2020-07-08 16:22:26--  https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.8.0-x86_64.rpm
Resolving artifacts.elastic.co (artifacts.elastic.co)... 151.101.2.222, 151.101.66.222, 151.101.130.222, ...
Connecting to artifacts.elastic.co (artifacts.elastic.co)|151.101.2.222|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 319213800 (304M) [application/octet-stream]
Saving to: ‘elasticsearch-7.8.0-x86_64.rpm’

100%[=============================================================>] 319,213,800 1.11MB/s   in 5m 11s 

2020-07-08 16:27:38 (1001 KB/s) - ‘elasticsearch-7.8.0-x86_64.rpm’ saved [319213800/319213800]

Once the download is completed, you can install the Elasticsearch by using the following command

[root@linuxhelp ~]# rpm -ivh elasticsearch-7.8.0-x86_64.rpm
warning: elasticsearch-7.8.0-x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID d88e42b4: NOKEY
Preparing...                          ################################# [100%]
Creating elasticsearch group... OK
Creating elasticsearch user... OK
Updating / installing...
   1:elasticsearch-0:7.8.0-1          ################################# [100%]
### NOT starting on installation, please execute the following statements to configure elasticsearch service to start automatically using systemd
 sudo systemctl daemon-reload
 sudo systemctl enable elasticsearch.service
### You can start elasticsearch service by executing
 sudo systemctl start elasticsearch.service
Created elasticsearch keystore in /etc/elasticsearch/elasticsearch.keystore

And then reload the daemon service by triggering the following command.

[root@linuxhelp ~]# systemctl daemon-reload

After that, you can start elasticsearch by using the following command

[root@linuxhelp ~]# systemctl start elasticsearch

Once it is started, enter into the elasticsearch configuration file and change the following line

[root@linuxhelp ~]# vim /etc/elasticsearch/elasticsearch.yml
network.host:192.168.7.228
http.port: 9200

Once it is done, check the elasticsearch status by running the following command.

[root@linuxhelp ~]# systemctl status elasticsearch.service
● elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Wed 2020-07-08 16:32:21 IST; 1min 29s ago
     Docs: https://www.elastic.co
  Process: 20082 ExecStart=/usr/share/elasticsearch/bin/systemd-entrypoint -p ${PID_DIR}/elasticsearch.pid --quiet (code=exited, status=78)
 Main PID: 20082 (code=exited, status=78)

Jul 08 16:31:29 linuxhelp systemd[1]: Starting Elasticsearch...
Jul 08 16:32:20 linuxhelp systemd-entrypoint[20082]: ERROR: [1] bootstrap checks failed
Jul 08 16:32:20 linuxhelp systemd-entrypoint[20082]: [1]: the default discovery settings are unsui...ed
Jul 08 16:32:20 linuxhelp systemd-entrypoint[20082]: ERROR: Elasticsearch did not exit normally - ...og
Jul 08 16:32:21 linuxhelp systemd[1]: elasticsearch.service: main process exited, code=exited, s.../n/a
Jul 08 16:32:21 linuxhelp systemd[1]: Failed to start Elasticsearch.
Jul 08 16:32:21 linuxhelp systemd[1]: Unit elasticsearch.service entered failed state.
Jul 08 16:32:21 linuxhelp systemd[1]: elasticsearch.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

If you get the bootstrap error go back to elasticsearch configuration and enter the command in following line 44

[root@linuxhelp ~]# vim /etc/elasticsearch/elasticsearch.yml

bootstrap.system_call_filter: false

And then go to the line number 71

discovery.seed_hosts: 192.168.7.228

Once the configuration is completed start the elasticsearch

[root@linuxhelp ~]# systemctl start elasticsearch

Now check the status of elasticsearch

[root@linuxhelp ~]# systemctl status elasticsearch
● elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2020-07-08 16:36:26 IST; 27s ago
     Docs: https://www.elastic.co
 Main PID: 20479 (java)
    Tasks: 45
   CGroup: /system.slice/elasticsearch.service
           ├─20479 /usr/share/elasticsearch/jdk/bin/java -Xshare:auto -Des.networkaddress.cache.ttl=...
           └─20634 /usr/share/elasticsearch/modules/x-pack-ml/platform/linux-x86_64/bin/controller

Jul 08 16:35:40 linuxhelp systemd[1]: Starting Elasticsearch...
Jul 08 16:36:26 linuxhelp systemd[1]: Started Elasticsearch.

After it is done, go to the browser and enter the ip address and port number Now you can check the elastic search is installed. With this, the installation of Elasticsearch comes to an end.