With systemd:
/etc/systemd/system.conf
DefaultLimitNOFILE=128000 You are a lucky admin who is NOT running systemd: /etc/security/limits.conf* soft nofile 128000 * hard nofile 128000 * hard nproc 128000 * soft nproc 128000 root soft nofile 128000 root hard nofile 128000Check with
# ulimit -n