安装jdk

linux下使用wget下载jdk8:
进到目录/usr/local/software

wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u141-b15/336fa29ff2bb4ef291e347e091f7f4a7/jdk-8u141-linux-x64.tar.gz"

vim /etc/profile加入

export JAVA_HOME=/usr/local/software/jdk8
export JAVA_BIN=/usr/local/software/jdk8
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME JAVA_BIN PATH CLASSPATH

下载elasticsearch安装包

wget  https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.2.2.tar.gz

解压tar -zxvf elasticsearch-6.2.2.tar.gz

配置es出现相关问题处理：

1、问题一

        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:
        # /usr/local/software/temp/elasticsearch-6.2.2/hs_err_pid1912.log
    解决：内存不够，增加内存

2、问题二

        [root@iZwz95j86y235aroi85ht0Z bin]# ./elasticsearch
        [2018-02-22T20:14:04,870][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] 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:125) ~[elasticsearch-6.2.2.jar:6.2.2]
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.2.2.jar:6.2.2]
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.2.2.jar:6.2.2]
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.2.2.jar:6.2.2]
    解决：用非root用户
        添加用户：useradd -m 用户名  然后设置密码  passwd 用户名
        

3、问题三

        ./elasticsearch
        Exception in thread "main" java.nio.file.AccessDeniedException: /usr/local/software/temp/elasticsearch-6.2.2/config/jvm.options
       解决：权限不够 chmod 777 -R 当前es目录