Centos7.6安装elasticsearch-6.8.0（报错大全百分百解决）

Centos7.6安装elasticsearch-6.8.0（报错大全百分百解决）

1，启动报以下错误：

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_pid2322.log

解决：虚拟机分配的内存太低了，至少1024M,可以修改，然后重新启动就可以了

2，启动报以下错误：

[2021-07-21T16:30:42,769][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [unknown] 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:163) ~[elasticsearch-6.8.0.jar:6.8.0]
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-6.8.0.jar:6.8.0]
	at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.8.0.jar:6.8.0]
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.8.0.jar:6.8.0]
	at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.8.0.jar:6.8.0]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:116) ~[elasticsearch-6.8.0.jar:6.8.0]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[elasticsearch-6.8.0.jar:6.8.0]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
	at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:103) ~[elasticsearch-6.8.0.jar:6.8.0]
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:170) ~[elasticsearch-6.8.0.jar:6.8.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:333) ~[elasticsearch-6.8.0.jar:6.8.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-6.8.0.jar:6.8.0]
	... 6 more

解决：不可以在root用户启动，要更换用户启动，并且给启动的用户赋予权限，进入root下面：依次执行下面命令！！！

chown -R test:test /usr/local/elasticsearch-6.8.0/
chmod 777 /usr/local/elasticsearch-6.8.0/
chown -R test:test /home/test
chmod 777 /home/test
-------------------------解析----------------------------
chown -R 自己创建的用户名:自己创建的用户名 /usr/local/elasticsearch-6.8.0/
chmod 777 /usr/local/elasticsearch-6.8.0/
chown -R 自己创建的用户名:自己创建的用户名 /home/test
chmod 777 /home/自己创建的用户名

3，启动报下面错误：

[esuser@localhost bin]$ ./elasticsearch
Exception in thread "main" java.nio.file.AccessDeniedException: /usr/local/elasticsearch-6.8.0/config/jvm.options
	at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84)
	at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
	at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
	at sun.nio.fs.UnixFileS