一 ES基础知识介绍

Near Reamtime（NRT）

Elasticsearch 是一个实时的查询平台，从索引数据开始到索引数据结束几乎是1s的时间

Cluster

集群是一个或多个节点的集合，这些节点一起保存数据，并在所有节点上提供联合索引和搜索功能，集群通过唯一的名称（默认为elasticsearch）加以标记，同一个节点只能加入一个集群中。

Node

节点是集群中用来存储数据、参与集群中索引和搜索功能的一台单独的服务器，节点在启动时默认会分配一个随机的UUID作为集群中该节点的身份标识，该名称可以手动在配置文件中指定。

Index

Elasticsearch和RDBMS名词对比
Elasticsearch	RDBMS
Indices（indices1,indices2,indices3...）	Database(database1,database2,database3...)
Types	Tables
Documents	Rows
Fileds	Columns

Elasticsearch7.4下载

https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.4.2-linux-x86_64.tar.gz

JDK1.8下载

http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.tar.gz

二安装Elasticsearch

1. 新建用户，并为用户配置环境变量

# groupadd -r elasticsearch

# useradd -r -g elasticsearch -G root elasticsearch

# cat /home/elasticsearch /.bash_profile 

# .bash_profile

# Get the aliases and functions

if [ -f ~/.bashrc ]; then

. ~/.bashrc

fi

# User specific environment and startup programs

export JAVA_HOME=/usr/java/jdk1..0_111

export ES_HOME=/usr/local/elasticsearch

export PATH=$JAVA_HOME/bin:$ES_HOME/bin:$PATH

2. 系统和内核参数优化

# echo "vm.max_map_count=655360" >> /etc/sysctl.conf

# sysctl -p

# cat /etc/security/limits.conf

elasticsearch soft nproc

elasticsearch hard nproc

elasticsearch soft nofile

elasticsearch hard nofile

elasticsearch soft memlock unlimited

elasticsearch hard memlock unlimited

注：如果不进行参数优化，启动elasticsearch时候可能会报如下错误

[--07T09::,][INFO ][o.e.b.BootstrapChecks    ] [sht-sgmhadoopdn-] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks

ERROR: [] bootstrap checks failed

[]: max file descriptors [] for elasticsearch process is too low, increase to at least []

[]: max virtual memory areas vm.max_map_count [] is too low, increase to at least []

[--07T09::,][INFO ][o.e.n.Node               ] [sht-sgmhadoopdn-] stopping ...

[--07T09::,][INFO ][o.e.n.Node               ] [sht-sgmhadoopdn-] stopped

[--07T09::,][INFO ][o.e.n.Node               ] [sht-sgmhadoopdn-] closing ...

[--07T09::,][INFO ][o.e.n.Node               ] [sht-sgmhadoopdn-] closed

注：运行elasticsearch的用户最好为elasticsearch，我曾试着用mysqladmin用户运行elasticsearch，但是会报java版本不匹配的错，实际上我的mysqladmin用户的环境变量里已经配置了java，并且已经生效，但是elasticsearch还是读取系统全局的变量，暂时不清楚原因，可以理解为一个未知的bug吧

$ ./elasticsearch --help

Elasticsearch requires at least Java  but your Java version from /bin/java does not meet this requirement

[mysqladmin@sht-sgmhadoopdn- bin]$ java -version

java version "1.8.0_111"

Java(TM) SE Runtime Environment (build 1.8.0_111-b14)

Java HotSpot(TM) -Bit Server VM (build 25.111-b14, mixed mode)

[mysqladmin@sht-sgmhadoopdn- bin]$ which java

/usr/java/jdk1..0_111/bin/java

[mysqladmin@sht-sgmhadoopdn- bin]$ /bin/java -version

java version "1.7.0_40"

Java(TM) SE Runtime Environment (build 1.7.0_40-b43)

Java HotSpot(TM) -Bit Server VM (build 24.0-b56, mixed mode)

3.修改elasticsearch配置文件

$ cat elasticsearch.yml  | grep -v "$^" | grep -v "^#"

cluster.name: dev-es

node.name: sht-sgmhadoopnn-

node.attr.rack: r1

path.data: /usr/local/elasticsearch/data

path.logs: /usr/local/elasticsearch/data/logs

bootstrap.memory_lock: false

network.host: 0.0.0.0

http.port:

cluster.initial_master_nodes: ["sht-sgmhadoopnn-01"]

4.启动elasticsearch

$ cd /usr/local/elasticsearch/bin/

$ ./elasticsearch

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.

[2019-11-29T21:40:49,749][INFO ][o.e.e.NodeEnvironment    ] [sht-sgmhadoopnn-01] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [41.5gb], net total_space [76.4gb], types [rootfs]

[2019-11-29T21:40:49,756][INFO ][o.e.e.NodeEnvironment    ] [sht-sgmhadoopnn-01] heap size [1007.3mb], compressed ordinary object pointers [true]

[2019-11-29T21:40:49,762][INFO ][o.e.n.Node               ] [sht-sgmhadoopnn-01] node name [sht-sgmhadoopnn-01], node ID [VwFAki8mQjqxSuujq579NA], cluster name [dev-es]

[2019-11-29T21:40:49,763][INFO ][o.e.n.Node               ] [sht-sgmhadoopnn-01] version[7.4.2], pid[15451], build[default/tar/2f90bbf7b93631e52bafb59b3b049cb44ec25e96/2019-10-28T20:40:44.881551Z], OS[Linux/3.10.0-957.12.2.el7.x86_64/amd64], JVM[AdoptOpenJDK/OpenJDK 64-Bit Server VM/13.0.1/13.0.1+9]

[2019-11-29T21:40:49,763][INFO ][o.e.n.Node               ] [sht-sgmhadoopnn-01] JVM home [/usr/local/elasticsearch-7.4.2/jdk]

[2019-11-29T21:40:49,764][INFO ][o.e.n.Node               ] [sht-sgmhadoopnn-01] JVM arguments [-Xms1g, -Xmx1g, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -Des.networkaddress.cache.ttl=60, -Des.networkaddress.cache.negative.ttl=10, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dio.netty.allocator.numDirectArenas=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Djava.io.tmpdir=/tmp/elasticsearch-14884986979711276651, -XX:+HeapDumpOnOutOfMemoryError, -XX:HeapDumpPath=data, -XX:ErrorFile=logs/hs_err_pid%p.log, -Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m, -Djava.locale.providers=COMPAT, -Dio.netty.allocator.type=unpooled, -XX:MaxDirectMemorySize=536870912, -Des.path.home=/usr/local/elasticsearch, -Des.path.conf=/usr/local/elasticsearch/config, -Des.distribution.flavor=default, -Des.distribution.type=tar, -Des.bundled_jdk=true]

[2019-11-29T21:40:54,923][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [aggs-matrix-stats]

[2019-11-29T21:40:54,923][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [analysis-common]

[2019-11-29T21:40:54,924][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [data-frame]

[2019-11-29T21:40:54,924][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [flattened]

[2019-11-29T21:40:54,929][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [frozen-indices]

[2019-11-29T21:40:54,930][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [ingest-common]

[2019-11-29T21:40:54,930][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [ingest-geoip]

[2019-11-29T21:40:54,931][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [ingest-user-agent]

[2019-11-29T21:40:54,931][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [lang-expression]

[2019-11-29T21:40:54,931][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [lang-mustache]

[2019-11-29T21:40:54,934][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [lang-painless]

[2019-11-29T21:40:54,934][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [mapper-extras]

[2019-11-29T21:40:54,935][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [parent-join]

[2019-11-29T21:40:54,935][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [percolator]

[2019-11-29T21:40:54,935][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [rank-eval]

[2019-11-29T21:40:54,939][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [reindex]

[2019-11-29T21:40:54,939][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [repository-url]

[2019-11-29T21:40:54,940][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [search-business-rules]

[2019-11-29T21:40:54,940][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [spatial]

[2019-11-29T21:40:54,940][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [transport-netty4]

[2019-11-29T21:40:54,944][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [vectors]

[2019-11-29T21:40:54,945][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-analytics]

[2019-11-29T21:40:54,945][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-ccr]

[2019-11-29T21:40:54,946][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-core]

[2019-11-29T21:40:54,946][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-deprecation]

[2019-11-29T21:40:54,946][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-graph]

[2019-11-29T21:40:54,953][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-ilm]

[2019-11-29T21:40:54,954][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-logstash]

[2019-11-29T21:40:54,954][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-ml]

[2019-11-29T21:40:54,954][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-monitoring]

[2019-11-29T21:40:54,955][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-rollup]

[2019-11-29T21:40:54,955][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-security]

[2019-11-29T21:40:54,959][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-sql]

[2019-11-29T21:40:54,959][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-voting-only-node]

[2019-11-29T21:40:54,960][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] loaded module [x-pack-watcher]

[2019-11-29T21:40:54,961][INFO ][o.e.p.PluginsService     ] [sht-sgmhadoopnn-01] no plugins loaded

[2019-11-29T21:41:04,226][INFO ][o.e.x.s.a.s.FileRolesStore] [sht-sgmhadoopnn-01] parsed [0] roles from file [/usr/local/elasticsearch/config/roles.yml]

[2019-11-29T21:41:06,319][INFO ][o.e.x.m.p.l.CppLogMessageHandler] [sht-sgmhadoopnn-01] [controller/15548] [Main.cc@110] controller (64 bit): Version 7.4.2 (Build 473f61b8a5238b) Copyright (c) 2019 Elasticsearch BV

[2019-11-29T21:41:07,855][DEBUG][o.e.a.ActionModule       ] [sht-sgmhadoopnn-01] Using REST wrapper from plugin org.elasticsearch.xpack.security.Security

[2019-11-29T21:41:08,615][INFO ][o.e.d.DiscoveryModule    ] [sht-sgmhadoopnn-01] using discovery type [zen] and seed hosts providers [settings]

[2019-11-29T21:41:10,403][INFO ][o.e.n.Node               ] [sht-sgmhadoopnn-01] initialized

[2019-11-29T21:41:10,404][INFO ][o.e.n.Node               ] [sht-sgmhadoopnn-01] starting ...

[2019-11-29T21:41:10,642][INFO ][o.e.t.TransportService   ] [sht-sgmhadoopnn-01] publish_address {172.16.101.55:9300}, bound_addresses {[::]:9300}

[2019-11-29T21:41:10,657][INFO ][o.e.b.BootstrapChecks    ] [sht-sgmhadoopnn-01] bound or publishing to a non-loopback address, enforcing bootstrap checks

[2019-11-29T21:41:10,688][INFO ][o.e.c.c.Coordinator      ] [sht-sgmhadoopnn-01] setting initial configuration to VotingConfiguration{VwFAki8mQjqxSuujq579NA}

[2019-11-29T21:41:11,063][INFO ][o.e.c.s.MasterService    ] [sht-sgmhadoopnn-01] elected-as-master ([1] nodes joined)[{sht-sgmhadoopnn-01}{VwFAki8mQjqxSuujq579NA}{vo1YU6yIR5y3eevPfr-PvQ}{172.16.101.55}{172.16.101.55:9300}{dilm}{ml.machine_memory=6087860224, rack=r1, xpack.installed=true, ml.max_open_jobs=20} elect leader, _BECOME_MASTER_TASK_, _FINISH_ELECTION_], term: 1, version: 1, reason: master node changed {previous [], current [{sht-sgmhadoopnn-01}{VwFAki8mQjqxSuujq579NA}{vo1YU6yIR5y3eevPfr-PvQ}{172.16.101.55}{172.16.101.55:9300}{dilm}{ml.machine_memory=6087860224, rack=r1, xpack.installed=true, ml.max_open_jobs=20}]}

[2019-11-29T21:41:11,180][INFO ][o.e.c.c.CoordinationState] [sht-sgmhadoopnn-01] cluster UUID set to [kfD_MSD4SOSuF0gPlKBWVQ]

[2019-11-29T21:41:11,257][INFO ][o.e.c.s.ClusterApplierService] [sht-sgmhadoopnn-01] master node changed {previous [], current [{sht-sgmhadoopnn-01}{VwFAki8mQjqxSuujq579NA}{vo1YU6yIR5y3eevPfr-PvQ}{172.16.101.55}{172.16.101.55:9300}{dilm}{ml.machine_memory=6087860224, rack=r1, xpack.installed=true, ml.max_open_jobs=20}]}, term: 1, version: 1, reason: Publication{term=1, version=1}

[2019-11-29T21:41:11,428][INFO ][o.e.h.AbstractHttpServerTransport] [sht-sgmhadoopnn-01] publish_address {172.16.101.55:9200}, bound_addresses {[::]:9200}

[2019-11-29T21:41:11,429][INFO ][o.e.n.Node               ] [sht-sgmhadoopnn-01] started

[2019-11-29T21:41:11,669][INFO ][o.e.g.GatewayService     ] [sht-sgmhadoopnn-01] recovered [0] indices into cluster_state

[2019-11-29T21:41:12,228][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.triggered_watches] for index patterns [.triggered_watches*]

[2019-11-29T21:41:12,370][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.watches] for index patterns [.watches*]

[2019-11-29T21:41:12,517][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.watch-history-10] for index patterns [.watcher-history-10*]

[2019-11-29T21:41:12,637][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.slm-history] for index patterns [.slm-history-1*]

[2019-11-29T21:41:12,741][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.monitoring-logstash] for index patterns [.monitoring-logstash-7-*]

[2019-11-29T21:41:12,916][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.monitoring-es] for index patterns [.monitoring-es-7-*]

[2019-11-29T21:41:13,079][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.monitoring-beats] for index patterns [.monitoring-beats-7-*]

[2019-11-29T21:41:13,195][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.monitoring-alerts-7] for index patterns [.monitoring-alerts-7]

[2019-11-29T21:41:13,291][INFO ][o.e.c.m.MetaDataIndexTemplateService] [sht-sgmhadoopnn-01] adding template [.monitoring-kibana] for index patterns [.monitoring-kibana-7-*]

[2019-11-29T21:41:13,385][INFO ][o.e.x.i.a.TransportPutLifecycleAction] [sht-sgmhadoopnn-01] adding index lifecycle policy [watch-history-ilm-policy]

[2019-11-29T21:41:13,503][INFO ][o.e.x.i.a.TransportPutLifecycleAction] [sht-sgmhadoopnn-01] adding index lifecycle policy [slm-history-ilm-policy]

[2019-11-29T21:41:13,934][INFO ][o.e.l.LicenseService     ] [sht-sgmhadoopnn-01] license [c6634b36-15ab-4c2f-a1d1-01dfc4dafe4e] mode [basic] - valid

[2019-11-29T21:41:13,935][INFO ][o.e.x.s.s.SecurityStatusChangeListener] [sht-sgmhadoopnn-01] Active license is now [BASIC]; Security is disabled

注:我在CentOS6启动时会报错

[--10T10::,][WARN ][o.e.b.JNANatives         ] unable to install syscall filter:

java.lang.UnsupportedOperationException: seccomp unavailable: requires kernel 3.5+ with CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER compiled in

    at org.elasticsearch.bootstrap.SystemCallFilter.linuxImpl(SystemCallFilter.java:) ~[elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.SystemCallFilter.init(SystemCallFilter.java:) ~[elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.JNANatives.tryInstallSystemCallFilter(JNANatives.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.Natives.tryInstallSystemCallFilter(Natives.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.cli.Command.main(Command.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:) [elasticsearch-5.5..jar:5.5.]

    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:) [elasticsearch-5.5..jar:5.5.]

https://github.com/elastic/elasticsearch/issues/22899

解决办法:在elasticsearch.yml配置文件添加

bootstrap.memory_lock: false
bootstrap.system_call_filter: false

注：不加任何参数为前台启动，以后台进程启动的话需执行下面的命令

[elsearch@sht-sgmhadoopdn-04 bin]$ ./elasticsearch &

[elsearch@sht-sgmhadoopdn-04 bin]$ ./elasticsearch -d

5.将elasticsearch添加为系统服务

# cat /usr/lib/systemd/system/elasticsearch.service

[Unit]

Description=Elasticsearch

Documentation=http://www.elastic.co

Wants=network-online.target

After=network-online.target

[Service]

Type=notify

RuntimeDirectory=elasticsearch

PrivateTmp=true

Environment=ES_HOME=/usr/local/elasticsearch

Environment=ES_PATH_CONF=/usr/local/elasticsearch/config

Environment=PID_DIR=/var/run/elasticsearch

Environment=ES_SD_NOTIFY=true

EnvironmentFile=-/etc/sysconfig/elasticsearch

WorkingDirectory=/usr/local/elasticsearch

User=elasticsearch

Group=elasticsearch

Type=forking

Restart=always

ExecStart=/usr/local/elasticsearch/bin/elasticsearch -d -p ${PID_DIR}/elasticsearch.pid

# StandardOutput is configured to redirect to journalctl since

# some error messages may be logged in standard output before

# elasticsearch logging system is initialized. Elasticsearch

# stores its logs in /var/log/elasticsearch and does not use

# journalctl by default. If you also want to enable journalctl

# logging, you can simply remove the "quiet" option from ExecStart.

StandardOutput=journal

StandardError=inherit

# Specifies the maximum file descriptor number that can be opened by this process

LimitNOFILE=

# Specifies the maximum number of processes

LimitNPROC=

# Specifies the maximum size of virtual memory

LimitAS=infinity

# Specifies the maximum file size

LimitFSIZE=infinity

# Disable timeout logic and wait until process is stopped

TimeoutStopSec=

# SIGTERM signal is used to stop the Java process

KillSignal=SIGTERM

# Send the signal only to the JVM rather than its control group

KillMode=process

# Java process is never killed

SendSIGKILL=no

# When a JVM receives a SIGTERM signal it exits with code

SuccessExitStatus=

[Install]

WantedBy=multi-user.target

# Built for ${project.name}-${project.version} (${project.name})

# systemctl daemon-reload

# systemctl enable elasticsearch

# systemctl start elasticsearch

# systemctl status elasticsearch

● elasticsearch.service - Elasticsearch

   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: disabled)

   Active: active (running) since Fri -- :: CST; 34s ago

     Docs: http://www.elastic.co

  Process:  ExecStart=/usr/local/elasticsearch/bin/elasticsearch -d -p ${PID_DIR}/elasticsearch.pid (code=exited, status=/SUCCESS)

 Main PID:  (java)

    Tasks:

   Memory: .2G

   CGroup: /system.slice/elasticsearch.service

           ├─ /usr/local/elasticsearch/jdk/bin/java -Xms1g -Xmx1g -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction= -XX:+UseCMSInitiatingOccupancyOnly -Des.networkaddress.cache.ttl= -Des.networkaddress.cache.negative.ttl= -XX:+Alw...

           └─ /usr/local/elasticsearch/modules/x-pack-ml/platform/linux-x86_64/bin/controller

Dec  :: sht-sgmhadoopnn- systemd[]: Starting Elasticsearch...

Dec  :: sht-sgmhadoopnn- systemd[]: Started Elasticsearch.

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