ERROR: bootstrap checks failed
max file descriptors [4096] for elasticsearch process likely too low,
increase to at least [65536]
max number of threads [1024] for user [lishang] likely too low,
increase to at least [2048]
max virtual memory areas vm.max_map_count [65530] likely too low,
increase to at least [262144]
解決：切換到root用戶，編輯limits.conf 添加類似如下內容
vi /etc/security/limits.conf
添加如下內容:
* soft nofile 65536
* hard nofile 131072
* soft nproc 2048
* hard nproc 4096
對於第二條錯誤同意需要切換到root用戶，進入limits.d目錄下修改配置文件。
vi /etc/security/limits.d/90-nproc.conf
修改如下內容：
* soft nproc 1024
#修改為
* soft nproc 2048
第三條錯誤需要切換到root用戶修改配置sysctl.conf
vi /etc/sysctl.conf
添加下面配置：
vm.max_map_count=655360
並執行命令：
sysctl -p
然后，重新啟動elasticsearch，即可啟動成功。
啟動問題
**1、Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error='Cannot allocate memory' (errno=12)**
由於elasticsearch5.0默認分配jvm空間大小為2g，修改jvm空間分配
# vim config/jvm.options
-Xms2g
-Xmx2g
修改為
-Xms512m
-Xmx512m
2、max number of threads [1024] for user [elasticsearch] is too low, increase to at least [2048]修改 /etc/security/limits.d/90-nproc.conf
* soft nproc 1024
* soft nproc 2048
3、max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
修改/etc/sysctl.conf配置文件，
cat /etc/sysctl.conf | grep vm.max_map_countvm.max_map_count=262144
如果不存在則添加
echo "vm.max_map_count=262144" >>/etc/sysctl.conf
4、max file descriptors [65535] for elasticsearch process likely too low, increase to at least [65536]
需要執行下面的命令
ulimit -n 65536
作者：未不明不知不覺
鏈接：http://www.jianshu.com/p/4c6f9361565b
來源：簡書
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