[root@zrx bin]# ./elasticsearch
OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N
OpenJDK 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:

/root/01-install/02-elasticsearch/elasticsearch-5.5.2/bin/hs_err_pid29027.log