报错一：
ERROR: bootstrap checks failed
解决方案：
vim /etc/security/limits.conf //添加, 【注销后并重新登录生效】
* soft nofile 300000
* hard nofile 300000
* soft nproc 102400
* hard nproc 102400
* hard memlock unlimited
* soft memlock unlimited
报错二：
[2016-12-30T15:18:09,190][WARN ][o.e.b.JNANatives ] Unable to lock JVM Memory: error=12, reason=无法分配内存
[2016-12-30T15:18:09,190][WARN ][o.e.b.JNANatives ] This can result in part of the JVM being swapped out.
[2016-12-30T15:18:09,191][WARN ][o.e.b.JNANatives ] Increase RLIMIT_MEMLOCK, soft limit: 65536, hard limit: 65536
[2016-12-30T15:18:09,191][WARN ][o.e.b.JNANatives ] These can be adjusted by modifying /etc/security/limits.conf, for example:
# allow user 'stt' mlockall
stt soft memlock unlimited
stt hard memlock unlimited
解决方案：
vim /etc/security/limits.conf //添加
* soft memlock unlimited
* hard memlock unlimited
报错三：
max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
解决方案：
vim /etc/sysctl.conf //添加
vm.max_map_count=262144
执行：sysctl -p
报错四：
max number of threads [3818] for user [es] is too low, increase to at least [4096]
解决方案：
最大线程个数太低。修改配置文件/etc/security/limits.conf，增加配置
soft nproc 4096
hard nproc 4096
可通过命令查看
ulimit -Hu
ulimit -Su
报错五：
（这个问题一但成为第一个阻断服务启动的原因，在终端是不会有输出和任何的日志记录的，文章末请听我讲）
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000094cc0000, 1798569984, 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 1798569984 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /home/stt/server/elasticsearch-5.1.1/hs_err_pid10221.log
解决方案(最好不要修改默认值,否则引起更多问题)：
（内存溢出，思路更改JVM内存大小即可）
vim elasticsearch-5.1.1/config/jvm.options
# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space
-Xms1g (默认为2G)
-Xmx1g (默认为2G)
2017-01-12T16:12:22,404][INFO ][o.e.b.BootstrapCheck ] [SfD5sIh] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
ERROR: bootstrap checks failed
initial heap size [536870912] not equal to maximum heap size [1073741824]; this can cause resize pauses and prevents mlockall from locking the entire heap
解决方法：
vi config/jvm.options
###-Xms 和 -Xmx需要配置的相等，不然无法启动成功。
-Xms1024m
-Xmx1024m
报错六：
elasticsearch启动报错Exception java.lang.IllegalStateException: Failed to create node environment
【问题描述】
1、启动elasticsearch后使用systemctl status elasticsearch查看状态异常
2、查看/var/log/elasticsearch下elasticsearch日志报错
elasticsearch启动报错
Exception java.lang.IllegalStateException: Failed to create node environment
【问题分析】
1、部署elasticsearch后，设置的elasticsearch的data目录为/data/elasticsearch/data
2、由于/data/elasticsearch/data所在磁盘空间只有30g，挂载了另一个路径/es有300g空间，将elasticsearch的data目录从/data/elasticsearch/data切换到/es/data
3、切换后启动elasticsearch报上述错误
4、检查/data/elasticsearch/data目录属主为elasticsearch:elasticsearch
5、检查/es/data目录属主为root:root
【解决方案】
1、修改/es/data目录属主
chown -R elasticsearch:elasticsearch data
2、数据恢复
如果需要继续保留/data/elasticsearch/data下的数据，可以将该目录下的数据直接拷贝到/es/data目录下
cp -R /data/elasticsearch/data/nodes /es/data