启动es失败，java版本太低
[root@lepard elasticsearch]# service elasticsearch start
正在启动 elasticsearch：Elasticsearch requires at least Java 8 but your Java
version from /usr/bin/java does not meet this requirement
升级java8
yum update
前往[Oracle Java下载页面](http://www.oracle.com/technetwork/java/javase/downloads/index.html)
下载jdk-8u131-linux-x64.rpm
rpm -ivh jdk-8u131-linux-x64.rpm
java -version
配置JAVA环境变量参考 http://www.jianshu.com/p/848b06dd19aa
root用户启动失败
org.elasticsearch.bootstrap.StartupException:
java.lang.RuntimeException: can not run elasticsearch as root
groupadd elasticsearch
useradd elasticsearch -g elasticsearch -p elasticsearch
//改密码
passwd elasticsearch
su elasticsearch
This account is currently not available.
[root@lepard ~]# cat /etc/passwd | grep elasticsearch
elasticsearch:x:494:491:elasticsearch user:/home/elasticsearch:/sbin/nologin
发现它的shell是“/sbin /nologin”，需要将起改成“/bin/bash”
ES启动失败-vm.max_map_count [65530] is too low
ERROR: bootstrap checks failed
max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
解决办法：
The vm_map_max_count setting should be set permanently in /etc/sysctl.conf:
$ grep vm.max_map_count /etc/sysctl.conf
vm.max_map_count=262144
To apply the setting on a live system type:
sysctl -w vm.max_map_count=262144
ES启动失败-max file
max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
vim /etc/security/limits.conf
* soft nofile 65536
* hard nofile 65536
vim /etc/security/limits.d/90-nproc.conf
* soft nproc 102400
root soft nproc unlimited
ES启动失败-max number of threads
bootstrap checks failed
max number of threads [1024] for user [elasticsearch] is too low, increase to at least [2048]
cd /etc/security/limits.d
vi 90-nproc.conf
* soft nproc 102400
ES启动失败-system_call_filter
failed to install; check the logs and fix your configuration or disable
system call filters at your own risk
在elasticsearch.yml中配置bootstrap.system_call_filter为false，注意要在Memory下面:
bootstrap.memory_lock: false
bootstrap.system_call_filter: false
参考 http://www.jianshu.com/p/89f8099a6d09
ES启动失败-node locks
问题：Caused by: java.lang.IllegalStateException: failed to obtain node locks, tried [[/var/lib/elasticsearch/elasticsearch]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing
解决办法：chown -R elasticsearch /var/lib/elasticsearch/
首先打开防火墙
-A INPUT -p tcp -m tcp --dport 9200 -j ACCEPT
其次修改es配置文件network.host
cd /etc/elasticsearch/
vi elasticsearch.yml
添加ip
network.host: 10.2.3.4
http.port: 9200
