安装java环境
这里使用yum方式安装，前提是必须有网络
yum install java-1.8.0-openjdk
安装完成，查看java版本
[[email protected] ~]# java -version openjdk version "1.8.0_151" OpenJDK Runtime Environment (build 1.8.0_151-b12) OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)
安装 Elasticsearch
Elasticsearch的安装很简单，下载下来解压即可，这里使用wget下载，当然也可通过网页下载 https://www.elastic.co/downloads/elasticsearch ，再拷贝。
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.6.3.tar.gz
解压到/usr/local/
tar -zxvf elasticsearch-5.6.3.tar.gz -C /usr/local/
运行Elasticsearch
Elasticsearch 要求不能使用超级用户root运行，所以我们建立一个testuser账号
# 创建testuser账户 adduser testuser # 修改密码 passwd testuser
然后，给testuser用户elasticsearch目录的授权。
chown -R testuser /usr/local/elasticsearch-5.6.3/
切换至elasticsearch目录，并以testuser用户运行
cd /usr/local/elasticsearch-5.6.3/ su testuser
运行elasticsearch，如果想后台运行后面加 -d
[[email protected] elasticsearch-5.6.3]$ ./bin/elasticsearch [2017-10-31T16:07:09,445][INFO ][o.e.n.Node ] [] initializing ... [2017-10-31T16:07:09,662][INFO ][o.e.e.NodeEnvironment ] [oDFU6c3] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [45.4gb], net total_space [49.9gb], spins? [unknown], types [rootfs] [2017-10-31T16:07:09,662][INFO ][o.e.e.NodeEnvironment ] [oDFU6c3] heap size [1.9gb], compressed ordinary object pointers [true] [2017-10-31T16:07:09,663][INFO ][o.e.n.Node ] node name [oDFU6c3] derived from node ID [oDFU6c3UT6ORC2p0CKBeLA]; set [node.name] to override [2017-10-31T16:07:09,663][INFO ][o.e.n.Node ] version[5.6.3], pid[11484], build[1a2f265/2017-10-06T20:33:39.012Z], OS[Linux/3.10.0-514.26.2.el7.x86_64/amd64], JVM[Oracle Corporation/OpenJDK 64-Bit Server VM/1.8.0_151/25.151-b12] [2017-10-31T16:07:09,664][INFO ][o.e.n.Node ] JVM arguments [-Xms2g, -Xmx2g, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -XX: