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(Errcode: 24 – Too many open files) [23] – Plesk Onyx 17.5.3 and Ubuntu 16.04.2 LTS‬

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As of MySQL 5.7.7, this is what the documentation recommends for Red Hat Enterprise Linux 7, Oracle Linux 7, CentOS 7, SUSE Linux Enterprise Server 12, Fedora 24 and 25:

https://dev.mysql.com/doc/refman/5.7/en/using-systemd.html

On Ubuntu 16.04 the service is called mysql, not mysqld, so this is what I did:

sudo mkdir /etc/systemd/system/mysql.service.d
sudo vi /etc/systemd/system/mysql.service.d/override.conf
Added this in the new file override.conf:

[Service]
LimitNOFILE=1024 4096

Then restarted the service:

sudo systemctl daemon-reload
sudo systemctl restart mysql

and test it with

cat /proc/$(pgrep mysql)/limits | grep files

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