could not find java in ES_JAVA_HOME at /root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java

报错信息

es@MEPRDAPP01:/root/opt/elastic/elasticsearch-8.1.2> java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)
es@MEPRDAPP01:/root/opt/elastic/elasticsearch-8.1.2> sh start.sh
could not find java in ES_JAVA_HOME at /root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java
es@MEPRDAPP01:/root/opt/elastic/elasticsearch-8.1.2>

从上文中可以看到，全局的java是存在且版本号大于1.8的，并且当前用户非root用户
查看报错的原因：打开elasticsearch elasticsearch-env查看错误原因

可以看到该错误是文件不可执行时才报错，那么我们看下他是调用了ES_HOME的jdk，看下该目录下文件是否可执行

查看ES目录下的jdk是否可执行

es@MEPRDAPP01:/root/opt/elastic/elasticsearch-8.1.2> sh start.sh
could not find java in bundled JDK at /root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java
es@MEPRDAPP01:/root/opt/elastic/elasticsearch-8.1.2> .//root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java -version
bash: .//root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java: 没有那个文件或目录
es@MEPRDAPP01:/root/opt/elastic/elasticsearch-8.1.2> ./root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java -version
bash: ./root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java: 没有那个文件或目录
es@MEPRDAPP01:/root/opt/elastic/elasticsearch-8.1.2> cd /root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java
bash: cd: /root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java: 权限不够

由于root目录是root用户的，不能将root目录的用户和用户组设置为es，因此我们在根目录从新新建一个目录/es，将文件全部移动到/es下

MEPRDAPP01:~/opt # cd  /
MEPRDAPP01:/ # mkdir es
MEPRDAPP01:/ # mv /root/opt/ /es
MEPRDAPP01:/ # chown -R es:es /es
MEPRDAPP01:/ # ll
总用量 80
drwxr-xr-x   2 root root  4096 9月  26 2019 bin
drwxr-xr-x   3 root root  4096 9月  26 2019 boot
drwx------   2 root root   151 9月  26 2019 Desktop
drwxr-xr-x  21 root root  3980 4月   7 22:22 dev
drwxr-xr-x   3 es   es      17 4月  14 13:42 es
drwxr-xr-x 127 root root 12288 4月  14 12:22 etc
drwxr-xr-x   5 root root    49 4月  14 10:40 home

再次执行

es@MEPRDAPP01:/es/opt/elastic/elasticsearch-8.1.2> sh start.sh

查看报文还有报错错误1

ERROR: [1] bootstrap checks failed. You must address the points described in the following [1] lines before starting Elasticsearch.
bootstrap check failure [1] of [1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
ERROR: Elasticsearch did not exit normally - check the logs at /es/opt/elastic/logs/elasticsearch.log

修改Elastic的配置文件elasticsearch.yml文件

vim /es/opt/elastic/elasticsearch-8.1.2/config/elasticsearch.yml

添加该配置

node.name: node-1

错误2

编辑配置文件limits.conf

MEPRDAPP01:~ # vim /etc/security/limits.conf

添加如下配置

es hard nofile 65536
es soft nofile 65536

编辑配置文件 sysctl.conf

MEPRDAPP01:~ # vim /etc/sysctl.conf

添加如下配置

vm.max_map_count=655360

查看是否更改

sysctl -p

再次启动

注销调用户es重新登录，再次启动es

MEPRDAPP01:/es/opt/elastic/elasticsearch-8.1.2 # su es
es@MEPRDAPP01:/es/opt/elastic/elasticsearch-8.1.2> sh start.sh
warning: ignoring JAVA_HOME=/usr/local/java; using bundled JDK
warning: ignoring JAVA_HOME=/usr/local/java; using bundled JDK
warning: ignoring JAVA_HOME=/usr/local/java; using bundled JDK
[2022-04-14T14:23:36,960][INFO ][o.e.n.Node               ] [node-1] version[8.1.2], pid[169299], build[default/tar/31df9689e80bad366ac20176aa7f2371ea5eb4c1/2022-03-29T21:18:59.991429448Z], OS[Linux/4.12.14-94.41-default/amd64], JVM[Eclipse Adoptium/OpenJDK 64-Bit Server VM/17.0.2/17.0.2+8]
[2022-04-14T14:23:36,967][INFO ][o.e.n.Node               ] [node-1] JVM home [/es/opt/elastic/elasticsearch-8.1.2/jdk], using bundled JDK [true]
[2022-04-14T14:23:36,967][INFO ][o.e.n.Node               ] [node-1] JVM arguments [-Xshare:auto, -Des.networkaddress.cache.ttl=60, -Des.networkaddress.cache.negative.ttl=10, -Djava.security.manager=allow, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -XX:+ShowCodeDetailsInExceptionMessages, -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, -Dlog4j2.formatMsgNoLookups=true, -Djava.locale.providers=SPI,COMPAT, --add-opens=java.base/java.io=ALL-UNNAMED, -XX:+UseG1GC, -Djava.io.tmpdir=/tmp/elasticsearch-3763503562971088099, -XX:+HeapDumpOnOutOfMemoryError, -XX:+ExitOnOutOfMemoryError, -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, -Xms31744m, -Xmx31744m, -XX:MaxDirectMemorySize=16642998272, -XX:InitiatingHeapOccupancyPercent=30, -XX:G1ReservePercent=25, -Des.path.home=/es/opt/elastic/elasticsearch-8.1.2, -Des.path.conf=/es/opt/elastic/elasticsearch-8.1.2/config, -Des.distribution.flavor=default, -Des.distribution.type=tar, -Des.bundled_jdk=true]
[2022-04-14T14:23:39,443][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [aggs-matrix-stats]
[2022-04-14T14:23:39,443][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [analysis-common]
[2022-04-14T14:23:39,444][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [constant-keyword]
[2022-04-14T14:23:39,444][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [data-streams]
[2022-04-14T14:23:39,444][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [frozen-indices]
[2022-04-14T14:23:39,444][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [ingest-common]
[2022-04-14T14:23:39,444][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [ingest-geoip]
[2022-04-14T14:23:39,445][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [ingest-user-agent]
....

修改启动脚本内容为后台启动

MEPRDAPP01:/es/opt/elastic/elasticsearch-8.1.2 # vim start.sh

./bin/elasticsearch -d

其它

启动后估计四五分钟开始打印的日志出现拒绝连接的情况

[2022-04-14T14:28:12,711][WARN ][o.e.d.PeerFinder         ] [node-1] address [[::1]:9305], node [null], requesting [false] discovery result: [][[::1]:9305] connect_exception: 拒绝连接: /[0:0:0:0:0:0:0:1]:9305: 拒绝连接
[2022-04-14T14:28:12,711][WARN ][o.e.d.PeerFinder         ] [node-1] address [[::1]:9303], node [null], requesting [false] discovery result: [][[::1]:9303] connect_exception: 拒绝连接: /[0:0:0:0:0:0:0:1]:9303: 拒绝连接
[2022-04-14T14:28:12,711][WARN ][o.e.d.PeerFinder         ] [node-1] address [127.0.0.1:9302], node [null], requesting [false] discovery result: [][127.0.0.1:9302] connect_exception: 拒绝连接: /127.0.0.1:9302: 拒绝连接
[2022-04-14T14:28:12,711][WARN ][o.e.d.PeerFinder         ] [node-1] address [[::1]:9301], node [null], requesting [false] discovery result: [][[::1]:9301] connect_exception: 拒绝连接: /[0:0:0:0:0:0:0:1]:9301: 拒绝连接
[2022-04-14T14:28:12,711][WARN ][o.e.d.PeerFinder         ] [node-1] address [127.0.0.1:9304], node [null], requesting [false] discovery result: [][127.0.0.1:9304] connect_exception: 拒绝连接: /127.0.0.1:9304: 拒绝连接
[2022-04-14T14:28:12,711][WARN ][o.e.d.PeerFinder         ] [node-1] address [127.0.0.1:9301], node [null], requesting [false] discovery result: [][127.0.0.1:9301] connect_exception: 拒绝连接: /127.0.0.1:9301: 拒绝连接
[2022-04-14T14:28:12,711][WARN ][o.e.d.PeerFinder         ] [node-1] address [127.0.0.1:9303], node [null], requesting [false] discovery result: [][127.0.0.1:9303] connect_exception: 拒绝连接: /127.0.0.1:9303: 拒绝连接
[2022-04-14T14:28:12,711][WARN ][o.e.d.PeerFinder         ] [node-1] address [12

修改Elastic的配置文件elasticsearch.yml文件后所有配置如下

cluster.name: my-application
node.name: node-1
path.data: /es/opt/elastic/data
path.logs: /es/opt/elastic/logs
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["127.0.0.1"]
xpack.security.enabled: true
xpack.security.enrollment.enabled: true
xpack.security.http.ssl:enabled: truekeystore.path: certs/http.p12
xpack.security.transport.ssl:enabled: trueverification_mode: certificatekeystore.path: certs/transport.p12truststore.path: certs/transport.p12
cluster.initial_master_nodes: ["MEPRDAPP01"]

修改启动内存 [由于网上很多配置都是基于系统变量配置的，我们这里是用ES_HOME的java启动的，所有直接设置jvm配置]

vim /es/opt/elastic/elasticsearch-8.1.2/config/jvm.options

清除注释

## The heap size is automatically configured by Elasticsearch
## based on the available memory in your system and the roles
## each node is configured to fulfill. If specifying heap is
## required, it should be done through a file in jvm.options.d,
## which should be named with .options suffix, and the min and
## max should be set to the same value. For example, to set the
## heap to 4 GB, create a new file in the jvm.options.d
## directory containing these lines:
##
-Xms10g
-Xmx10g
##
## See https://www.elastic.co/guide/en/elasticsearch/reference/8.1/heap-size.html
## for more information

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could not find java in ES_JAVA_HOME at /root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java

报错信息

查看ES目录下的jdk是否可执行

再次执行

查看报文还有报错错误1

错误2

再次启动

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could not find java in ES_JAVA_HOME at /root/opt/elastic/elasticsearch-8.1.2/jdk/bin/java

报错信息

查看ES目录下的jdk是否可执行

再次执行

查看报文还有报错 错误1

错误2

再次启动

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