[elastic@localhost elasticsearch-head]$ 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.

# Native memory allocation (mmap) failed to map 2060255232 bytes for committing reserved memory.

# An error report file with more information is saved as:

# /tmp/hs_err_pid1480.log

由于elasticsearch5.5默认分配jvm空间大小为2g，修改jvm空间分配

vi /javaxl/es/elasticsearch-5.5.2/config/jvm.options

将默认配置 

-Xms2g  

-Xmx2g  

改成

-Xms512m  

-Xmx512m

over......