ES安装问题
elasticsearch 5.0 安装过程中遇到了一些问题，这是在网上找的一些资料
警告提示
[2016-11-06T16:27:21,712][WARN ][o.e.b.JNANatives ] unable to install syscall filter:
java.lang.UnsupportedOperationException: seccomp unavailable: requires kernel 3.5+ with CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER compiled in
at org.elasticsearch.bootstrap.Seccomp.linuxImpl(Seccomp.java:349) ~[elasticsearch-5.0.0.jar:5.0.0]
at org.elasticsearch.bootstrap.Seccomp.init(Seccomp.java:630) ~[elasticsearch-5.0.0.jar:5.0.0]
报了一大串错误，其实只是一个警告。使用心得linux版本，就不会出现此类问题了。
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]
解决：切换到root用户，编辑limits.conf 添加类似如下内容
vi /etc/security/limits.conf
添加如下内容:
* soft nofile 65536
* hard nofile 131072
* soft nproc 2048
* hard nproc 4096
对于第二条错误同意需要切换到root用户，进入limits.d目录下修改配置文件。
vi /etc/security/limits.d/90-nproc.conf
修改如下内容：
* soft nproc 1024
#修改为
* soft nproc 2048
第三条错误需要切换到root用户修改配置sysctl.conf
vi /etc/sysctl.conf
添加下面配置：
vm.max_map_count=655360
并执行命令：
sysctl -p
然后，重新启动elasticsearch，即可启动成功。
启动问题
**1、Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error='Cannot allocate memory' (errno=12)**
由于elasticsearch5.0默认分配jvm空间大小为2g，修改jvm空间分配
# vim config/jvm.options
-Xms2g
-Xmx2g
修改为
-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
如果不存在则添加
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]
需要执行下面的命令
ulimit -n 65536链接：https://www.jianshu.com/p/4c6f9361565b
來源：简书