우분투 Desktop에서 단순히 /etc/security/limits.conf 만 수정해선 안된다. 아래 순서대로 진행해야 한다.

1. sudo vi /etc/systemd/system.conf

: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]

DefaultLimitNOFILE=65536

2. sudo vi /etc/security/limits.conf

*       soft    nofile  65536
*       hard    nofile  65536
*       soft    nproc   65536
*       hard    nproc   65536
*       soft    memlock unlimited
*       hard    memlock unlimited

3. sudo vi /etc/sysctl.conf

: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

vm.max_map_count=262144