Linux服務器是CentOS 7.x

Elasticsearch下載地址：
https://www.elastic.co/downloa

解壓 tar -avxf elasticsearch-7.6.2-linux-x86_64.tar.gz -C /usr/local/

進入解壓後的elasticsearch目錄：
（1）新建data目錄：

mkdir data
1

（2）修改config/elasticsearch.yml：

vim config/elasticsearch.yml
1
取消下列項註釋並修改：

cluster.name: my-application #集羣名稱
node.name: node-1 #節點名稱
#數據和日誌的存儲目錄
path.data: /usr/local/elasticsearch-7.1.1/data
path.logs: /usr/local/elasticsearch-7.1.1/logs
#設置綁定的ip，設置爲0.0.0.0以後就可以讓任何計算機節點訪問到了
network.host: 0.0.0.0
http.port: 9200 #端口
#設置在集羣中的所有節點名稱，這個節點名稱就是之前所修改的，當然你也可以採用默認的也行，目前是單機，放入一個節點即可
cluster.initial_master_nodes: ["node-1"]

修改完畢後，:wq 保存退出vim

準備啓動es
進入/bin目錄執行命令：

./elasticsearch
1
我這裏出現如下錯誤：

Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c5330000, 986513408, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 986513408 bytes for committing reserved memory.
# An error report file with more information is saved as:
# logs/hs_err_pid22863.log
[root@VM_0_2_centos bin]#

看來是我這1G的內存太小了啊，elasticsearch使用java的jvm默認是使用1G的內存的，這裏我們修改一下內存，直接把內存改到200m
cd 到es目錄修改 ./config/jvm.options：

vim ./config/jvm.options

修改該內容：

-Xms200m
-Xmx200m

:wq 保存並退出vim，再次啓動es

再次啓動出現如下錯誤：

[root@localhost bin]# ./elasticsearch
future versions of Elasticsearch will require Java 11; your Java version from [/usr/local/java/jdk1.8.0_231/jre] does not meet this requirement
[2020-04-19T20:41:50,510][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-1] 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:174) ~[elasticsearch-7.6.2.jar:7.6.2]
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:161) ~[elasticsearch-7.6.2.jar:7.6.2]
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.6.2.jar:7.6.2]
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125) ~[elasticsearch-cli-7.6.2.jar:7.6.2]
        at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.6.2.jar:7.6.2]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:126) ~[elasticsearch-7.6.2.jar:7.6.2]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.6.2.jar:7.6.2]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105) ~[elasticsearch-7.6.2.jar:7.6.2]
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) ~[elasticsearch-7.6.2.jar:7.6.2]
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349) ~[elasticsearch-7.6.2.jar:7.6.2]
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:170) ~[elasticsearch-7.6.2.jar:7.6.2]
        ... 6 more
uncaught exception in thread [main]
java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105)
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172)
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349)
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:170)
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:161)
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125)
        at org.elasticsearch.cli.Command.main(Command.java:90)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:126)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92)
For complete error details, refer to the log at /usr/local/elasticsearch-7.6.2/logs/my-application.log

這是不能使用root用戶操作，添加一個其他的用戶再試試：

創建一個esroot用戶並設置初始密碼
useradd -c 'ES user' -d /home/esroot esroot
passwd esroot

將es安裝目錄屬主權限改爲esroot用戶
chown -R esroot /usr/local/elasticsearch-7.6.2/

切換用戶到esroot
su esroot

改一下es目錄所屬用戶：

chown esroot /usr/local/elasticsearch-7.6.2/ -R

vim 編輯 /etc/security/limits.conf，在末尾加上：

esroot nofile 65536
esroot hard nofile 65536
esroot soft nproc 4096
esroot hard nproc 4096

vim 編輯 vim /etc/security/limits.d/esroot-nproc.conf，將* 改爲用戶名（esroot）：

# Default limit for number of user's processes to prevent
# accidental fork bombs.
# See rhbz #432903 for reasoning.

es soft nproc 4096
root soft nproc unlimited

vim 編輯 /etc/sysctl.conf，在末尾加上：

vm.max_map_count = 655360

執行：

[root@VM_0_2_centos ~]# sysctl -p
kernel.printk = 5
vm.max_map_count = 655360
[root@VM_0_2_centos ~]#

登錄剛纔新建的es用戶，並啓動elasticsearch，OK

[root@VM_0_2_centos elasticsearch-7.1.1]# su es
[es@VM_0_2_centos elasticsearch-7.1.1]$ ./bin/elasticsearch

後臺啓動：

[es@VM_0_2_centos elasticsearch-7.1.1]$ ./bin/elasticsearch -d
[es@VM_0_2_centos elasticsearch-7.1.1]$
1
2
查看進程：

[es@VM_0_2_centos elasticsearch-7.1.1]$ ./bin/elasticsearch -d
[es@VM_0_2_centos elasticsearch-7.1.1]$ ps -ef|grep elasticsearch
es 18652 1 19 17:48 pts/2 00:00:00 /usr/local/java/jdk1.8.0_211/bin/java -Xms200m -Xmx200m -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 -Dlog4j.shutdownHookEnabled=false -Dlog4j2.disable.jmx=true -Djava.io.tmpdir=/tmp/elasticsearch-182563007296674551 -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=data -XX:ErrorFile=logs/hs_err_pid%p.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution -XX:+PrintGCApplicationStoppedTime -Xloggc:logs/gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=32 -XX:GCLogFileSize=64m -Dio.netty.allocator.type=unpooled -Des.path.home=/usr/local/elasticsearch-7.1.1 -Des.path.conf=/usr/local/elasticsearch-7.1.1/config -Des.distribution.flavor=default -Des.distribution.type=tar -Des.bundled_jdk=true -cp /usr/local/elasticsearch-7.1.1/lib/* org.elasticsearch.bootstrap.Elasticsearch -d
es 18728 8399 0 17:48 pts/2 00:00:00 grep --color=auto elasticsearch
[es@VM_0_2_centos elasticsearch-7.1.1]$

執行命令ss -taln

[root@localhost ~]# ss -taln
State       Recv-Q Send-Q              Local Address:Port                Peer Address:Port 
LISTEN      0      128                     127.0.0.1:9000                           *:*     
LISTEN      0      128                             *:80                             *:*     
LISTEN      0      128                             *:22                             *:*     
LISTEN      0      128                             *:88                             *:*     
LISTEN      0      100                     127.0.0.1:25                             *:*     
LISTEN      0      80                             :::3306                          :::*     
LISTEN      0      128                            :::9200                          :::*     
LISTEN      0      128                            :::9300                          :::*     
LISTEN      0      128                            :::22                            :::*     
LISTEN      0      100                           ::1:25

設置防火牆開啓 9200端口號訪問

firewall-cmd --zone=public --add-port=9200/tcp --permanent

systemctl restart firewalld

firewall-cmd --query-port=9200/tcp

· 可在瀏覽器中輸入如下地址：http://192.168.1.54:9200/

· 如果顯示如上信息，則代表Linux下ES已經搭建完畢(單機)

停止

· 若是es的前臺運行，則用ctrl + c 來停止。

· 若是es的後臺運行，則用kill -9 進程號來停止。(可通過jps命令，查看es進程號)

linux設置elasticsearch開機啓動

vim /etc/rc.local

添加

#elasticsearch開機自啓動
su esroot
/usr/local/elasticsearch-7.6.2/bin/elasticsearch -d

重啓，查看進程

jps

或者ss -taln

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