安装Elasticsearch 8.12.2版本出现的问题_elasticsearch 8.12 需要 jdk 的什么版本

        在Elasticsearch 官网下载了一个es的安装包，准备放在windows电脑上研究研究，下载下来之后启动报错。

JDK问题

jdk版本对应

warning: ignoring JAVA_HOME=E:\dev\jdk\jdk17\jdk-17.0.10; using bundled JDK

Exception in thread "main" java.lang.RuntimeException: starting java failed with [1]

output:

#

# There is insufficient memory for the Java Runtime Environment to continue.

# Native memory allocation (mmap) failed to map 8506048512 bytes for G1 virtual space

# An error report file with more information is saved as:

# logs/hs_err_pid18980.log

error:

OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000605000000, 8506048512, 0) failed; error='???????С?????????????' (DOS error/errno=1455)

at org.elasticsearch.server.cli.JvmOption.flagsFinal(JvmOption.java:120)

at org.elasticsearch.server.cli.JvmOption.findFinalOptions(JvmOption.java:87)

at org.elasticsearch.server.cli.JvmErgonomics.choose(JvmErgonomics.java:36)

at org.elasticsearch.server.cli.JvmOptionsParser.jvmOptions(JvmOptionsParser.java:139)

at org.elasticsearch.server.cli.JvmOptionsParser.determineJvmOptions(JvmOptionsParser.java:91)

at org.elasticsearch.server.cli.ServerProcess.createProcess(ServerProcess.java:208)

at org.elasticsearch.server.cli.ServerProcess.start(ServerProcess.java:104)

at org.elasticsearch.server.cli.ServerProcess.start(ServerProcess.java:88)

at org.elasticsearch.server.cli.ServerCli.startServer(ServerCli.java:247)

at org.elasticsearch.server.cli.ServerCli.execute(ServerCli.java:100)

at org.elasticsearch.common.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:54)

at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:85)

at org.elasticsearch.cli.Command.main(Command.java:50)

at org.elasticsearch.launcher.CliToolLauncher.main(CliToolLauncher.java:64)

        度娘很多次，搜索warning: ignoring JAVA_HOME=E:\dev\jdk\jdk1.8; using bundled JDK

大多说的是JDK版本不一致，因此我又去下载了很多高版本的JDK，发现结果是一样的 

warning: ignoring JAVA_HOME=E:\dev\jdk\jdk17; using bundled JDK

后面在elasticsearch-env.bat文件中发现他使用的是ES_JAVA_HOME，然后在环境变量中添加了ES_JAVA_HOME对应jdk17

内存问题

        当然没有这么顺利一下子就弄好了，改完这个之后，发现还是报错

warning: ignoring JAVA_HOME=E:\dev\jdk\jdk17; using ES_JAVA_HOME
Exception in thread "main" java.lang.RuntimeException: starting java failed with [1]
output:
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 8506048512 bytes for G1 virtual space
# An error report file with more information is saved as:
# logs/hs_err_pid8088.log
error:
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000605000000, 8506048512, 0) failed; error='???????С?????????????' (DOS error/errno=1455)
        at org.elasticsearch.server.cli.JvmOption.flagsFinal(JvmOption.java:120)
        at org.elasticsearch.server.cli.JvmOption.findFinalOptions(JvmOption.java:87)
        at org.elasticsearch.server.cli.JvmErgonomics.choose(JvmErgonomics.java:36)
        at org.elasticsearch.server.cli.JvmOptionsParser.jvmOptions(JvmOptionsParser.java:139)
        at org.elasticsearch.server.cli.JvmOptionsParser.determineJvmOptions(JvmOptionsParser.java:91)
        at org.elasticsearch.server.cli.ServerProcess.createProcess(ServerProcess.java:208)
        at org.elasticsearch.server.cli.ServerProcess.start(ServerProcess.java:104)
        at org.elasticsearch.server.cli.ServerProcess.start(ServerProcess.java:88)
        at org.elasticsearch.server.cli.ServerCli.startServer(ServerCli.java:247)
        at org.elasticsearch.server.cli.ServerCli.execute(ServerCli.java:100)
        at org.elasticsearch.common.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:54)
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:85)
        at org.elasticsearch.cli.Command.main(Command.java:50)
        at org.elasticsearch.launcher.CliToolLauncher.main(CliToolLauncher.java:64)

        warning: ignoring JAVA_HOME=E:\dev\jdk\jdk17; using ES_JAVA_HOME，这里已经发现他没有JDK的问题了，后面的意思是存在内存问题。

在jvm.options配置文件中，发现内存的配置是注释掉的，然后用的是多少我也不太清楚，当我把他修改为4g（把注释放开）后，就正常运行了

另外发现乱码的话，可以在文件中添加 -Dfile.encoding=GBK

 

SSL/TLS权限问题  

        当我看到启动成功，满环信心的时候，发现页面访问失败。

        多方寻找后，发现有可能是权限问题，尝试用https去访问，发现访问成功了。

        确认了是权限问题后，在elasticsearch.yml里面把这两个配置为false

        再次访问localhost:9200，成功！

参考博客 

jdk17安装 elasticsearch8 遇到的一个坑

Elasticsearch showing received plaintext http traffic on an https channel in console - Stack Overflow

官方文档