1: Java安装
1.1 检测是否安装java及java版本
在终端输入java –version，如果未安装java或者版本低于8，请下载java8，在终端输入：
wget http://download.oracle.com/otn-pub/java/jdk/8u112-b15/jdk-8u112-linux-x64.tar.gz?AuthParam=1478501340_5bfa9f75e38b012bb7e871c993104c2f
1.2 解压下载的文件，tar –xvf jdk-8u112-linux-x64.tar.gz
1.3 执行下面语句将解压后的文件夹jdk1.8.0_112 拷贝到/usr/lib/jvm下
cp –r jdk1.8.0_112 /usr/lib/jvm
1.4 配置java环境变量
1） cd ~
2）在.bashrc文件中配置java环境变量。vi .bashrc
export JAVA_HOME = /usr/local/jdk1.8.0
export JRE_HOME = ${JAVA_HOME}/jre
export CLASSPATH = .:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH = ${JAVA_HOME}/bin:$PATH
3）退出并保存。执行 source .bashrc
4）在终端执行java –version，输出以下信息，则完成配置
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)
2: elasticsearch安装
2.1 下载elasticsearch安装包
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.0.0.tar.gz
2.2 解压
sha1sum elasticsearch-5.0.0.tar.gz
tar -xzf elasticsearch-5.0.0.tar.gz
2.3 移动到指定文件夹并重命名
mv elasticsearch-5.0.0 /usr/local/elasticsearch
2.4 修改访问elasticsearch的IP及端口
vim /usr/local/elasticsearch/config/elasticsearch.yml
找到如下代码段，并取消network.host及http.port所在行的注释，修改IP及端口。
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 192.168.0.155
#
# Set a custom port for HTTP:
#
http.port: 9200
#
# For more information, see the documentation at:
# http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html
3: 启动elasticsearch并解决出现的错误
3.1直接运行bin/elasticsearch文件启动elasticsearch
cd /usr/java/elasticsearch/bin/
./elasticsearch
3.2 遇到问题及解决方案
问题一：Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
解决：增加服务器内存
问题二：can not run elasticsearch as root
解决：https://my.oschina.net/topeagle/blog/591451?fromerr=mzOr2qzZ
问题三：max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]
解决方法：切换到root用户，进入vi /etc/security/limits.conf ，增加配置（保存后注意切回elsearch用户的时候才能生效，sudo 修改的不能立即生效）：
elsearch soft nofile 819200
elsearch hard nofile 819200
问题四：max number of threads [1024] for user [work] likely too low, increase to at least [2048]
解决方法：进入limits.d下的配置文件：vi /etc/security/limits.d/90-nproc.conf ，修改配置如下：
* soft nproc 1024
修改为：
* soft nproc 2048
问题五：max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]
解决方法：修改sysctl文件：vi /etc/sysctl.conf ，增加下面配置项：
增加改行配置：vm.max_map_count=655360
保存退出后，执行：
sysctl -p
问题六：另外再配置ES的时候，threadpool.bulk.queue_size 已经变成了thread_pool.bulk.queue_size ，ES_HEAP_SIZE，ES_MAX_MEM等配置都变为ES_JAVA_OPTS这一配置项，如限制内存最大最小为1G：
export ES_JAVA_OPTS="-Xms1g -Xmx1g"
