I have set up ELK in my aws t2.medium instance (4 GB RAM) & it was working fine until today morning when logstash failed. This was the error I encountered while trying to start logstash
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c0000000, 174456832, 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 174456832 bytes for committing reserved memory. # An error report file with more information is saved as: # /home/ubuntu/hs_err_pid24701.log
jvm.options for logstash has -Xmx to 1 GB & -Xms to 256 MB. For elastic search it is max heap is 2 GB & min heap is 256 MB
But on checking the memory usage on the instance, top command shows
KiB Mem: 4046832 total, 3927576 used, 119256 free, 13144 buffers.
I am not sure how 3.9 GB RAM is being used as elastic search , kibana are all idle with Logstash being down.
So can someone help me explain how can this ram issue be fixed ?