systemd open file limit aka ulimit -n

[Service]
LimitMEMLOCK=infinity
LimitNOFILE=65535

[Service]

LimitMEMLOCK=infinity

LimitNOFILE=65535

I’m using archlinux.
In /etc/security/limits.conf

*               -       nofile          65535
*               -       memlock         unlimited

1 2	* - nofile 65535 * - memlock unlimited