** Also affects: mysql-5.7 (Ubuntu Artful) Importance: Undecided Status: Confirmed
** Also affects: mysql-5.7 (Ubuntu Xenial) Importance: Undecided Status: New ** Also affects: mysql-5.7 (Ubuntu Zesty) Importance: Undecided Status: New ** Tags added: sts ** Changed in: mysql-5.7 (Ubuntu Artful) Assignee: (unassigned) => Mario Splivalo (mariosplivalo) ** Changed in: mysql-5.7 (Ubuntu Zesty) Assignee: (unassigned) => Mario Splivalo (mariosplivalo) ** Changed in: mysql-5.7 (Ubuntu Xenial) Assignee: (unassigned) => Mario Splivalo (mariosplivalo) -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1721546 Title: max open files limit prevents max_connections over 214 on systemd Status in mysql-5.7 package in Ubuntu: Confirmed Status in mysql-5.7 source package in Xenial: New Status in mysql-5.7 source package in Zesty: New Status in mysql-5.7 source package in Artful: Confirmed Bug description: With the default mysql-server installation on systemd versions of Ubuntu (xenial and above) setting max_connections to more than 214 will not work, due to systemd imposed limits: root@juju-c2777d-default-1:~# grep max_connections /etc/mysql/mysql.conf.d/mysqld_settings_charm.cnf max_connections = 5500 root@juju-c2777d-default-1:~# grep max_connections /var/log/mysql/error.log 2017-10-05T12:41:16.958726Z 0 [Warning] Changed limits: max_connections: 214 (requested 5500) 2017-10-05T12:41:19.198391Z 0 [Warning] Changed limits: max_connections: 214 (requested 5500) root@juju-c2777d-default-1:~# grep open_files /var/log/mysql/error.log 2017-10-05T12:41:11.824199Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000) 2017-10-05T12:41:16.958668Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 27500) 2017-10-05T12:41:19.198342Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 27500) As can be seen, mysql tries to increase the open files limit to 27500, but due to systemd imposed limitation it fails to do so, and then it selects maximum possible number of connections, based on open files limit. This was the problem with default setups with pre-systemd installs, but upstart allowed mysqld to change the limit of open files before mysqld drops privileges from root to mysql system user. Even before that, on sysV init, there was a wrapper, mysqld_safe, which run as root, used ulimit to change the open files limit and then started mysqld as mysql user. Would it make sense to ship mysql-server packages with mysql.service unit files so that there is no limit for open files, or so that open files limit is substantially higher than 1024? This was all discussed when Ubuntu 15.10 came out, for mysql-5.6, in bug LP: #1434758, but I am still bringing this up for more recent mysql versions. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-5.7/+bug/1721546/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~group.of.nepali.translators Post to : group.of.nepali.translators@lists.launchpad.net Unsubscribe : https://launchpad.net/~group.of.nepali.translators More help : https://help.launchpad.net/ListHelp