[root@linuxidc elasticsearch]# yum list installed | grep java
[root@linuxidc elasticsearch]# yum list installed | grep jdk
jdk.x86_64 2000:1.7.0_51-fcs installed
[root@linuxidc elasticsearch]# yum -y remove jdk.x86_64
……
[root@linuxidc elasticsearch]#yum -y install java-1.8.0-openjdk*
……
注意：java-1.8.0-openjdk*”，后面有个星号，即安装 java 全部相关的东西~
•安装完成后，设置 JDK 的环境变量：
[root@linuxidc elasticsearch]# export JAVA_HOME=/usr/lib/jvm/java-1.8.0
[root@linuxidc elasticsearch]# export PATH=$JAVA_HOME/bin:$PATH
[root@linuxidc elasticsearch]# export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
[root@linuxidc elasticsearch]# java -version
openjdk version "1.8.0_71"
OpenJDK Runtime Environment (build 1.8.0_71-b15)
OpenJDK 64-Bit Server VM (build 25.71-b15, mixed mode)
[root@linuxidc elasticsearch]# echo $JAVA_HOME
/usr/lib/jvm/java-1.8.0
[root@linuxidc elasticsearch]#
另外，JDK 安装在了我机器的 /usr/lib/jvm 目录下，自己确认一下你的路径。
•再次运行：
[root@linuxidc elasticsearch]# bin/elasticsearch
Exception in thread "main" java.lang.RuntimeException: don't run elasticsearch as root.
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:93)
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:144)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:285)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
Refer to the log for complete error details.
[root@linuxidc elasticsearch]#
•又报错，elasticsearch 不能用 root 用户运行，那就建立一个：
[root@linuxidc elasticsearch]# groupadd es
[root@linuxidc elasticsearch]# useradd -g es es
[root@linuxidc elasticsearch]# passwd es
Changing password for user es.
New password:
BAD PASSWORD: it is WAY too short
BAD PASSWORD: is too simple
Retype new password:
passwd: all authentication tokens updated successfully.
[root@linuxidc elasticsearch]#
[root@linuxidc elasticsearch]# chown -R root .
[root@linuxidc elasticsearch]# chown -R es .
[root@linuxidc elasticsearch]# chgrp -R es .
[root@linuxidc elasticsearch]# ls -l
total 4
drwxr-xr-x 7 es es 4096 Mar 1 03:07 elasticsearch
[root@linuxidc elasticsearch]#
•重新打开一个终端，用 es 用户登录，并运行 elasticsearch：
[root@linuxidc ~]$ cd /usr/local/elasticsearch/elasticsearch
[root@linuxidc elasticsearch]$ bin/elasticsearch
[2016-03-01 05:11:48,413][WARN ][bootstrap ] unable to install syscall filter: seccomp unavailable: CONFIG_SECCOMP not compiled into kernel, CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER are needed
[2016-03-01 05:11:48,750][INFO ][node ] [Googam] version[2.1.1], pid[15042], build[40e2c53/2015-12-15T13:05:55Z]
[2016-03-01 05:11:48,750][INFO ][node ] [Googam] initializing ...
[2016-03-01 05:11:49,088][INFO ][plugins ] [Googam] loaded [elasticsearch-analysis-ik, elasticsearch-analysis-mmseg, elasticsearch-analysis-stconvert, elasticsearch-analysis-pinyin], sites []
[2016-03-01 05:11:49,121][INFO ][env ] [Googam] using [1] data paths, mounts [[/ (/dev/mapper/vg_linuxidc-lv_root)]], net usable_space [26.1gb], net total_space [34.8gb], spins? [possibly], types [ext4]
[2016-03-01 05:11:51,119][INFO ][mmseg-analyzer ] [Dict Loading] chars loaded time=42ms, line=12638, on file=chars.dic
……
•此时，在另一个终端，访问 elasticsearch：