Ambari agent not coming up

[#1]

ambari agent hung and gives error '/usr/sbin ambari-agent : fork : cannot allocate memory'

[#2]

Do yo have enough memory in the box ? what is free -m (buffer/cache) showing up ?

[#3]

Yes I have 256 GB box and only 10-15GB is occupied

[#4]

Anshul, what is output for "free -g" and also output for "df -h"?

[#5]

total used free shared buffers cached Mem: 251 2 249 0 0 0 -/+ buffers/cache: 1 250 Swap: 7 0 7

[#6]

do you feel here any issues with ambari heap size??

[#7]

Have you changed ambari-agent heap size? Plz paste the logs.