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I'm trying to restart MySQL after saving a script. The error states
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.

When running systemctl status mysql.service here's what I get:

Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)

   Active: activating (start-post) (Result: exit-code) since Isn 2016-09-26 17:15:28 MYT; 17s ago

  Process: 17478 ExecStart=/usr/sbin/mysqld (code=exited, status=1/FAILURE)

  Process: 17474 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)

 Main PID: 17478 (code=exited, status=1/FAILURE);         : 17479 (mysql-systemd-s)

   CGroup: /system.slice/mysql.service

           └─control

             ├─17479 /bin/bash /usr/share/mysql/mysql-systemd-start post

             └─17516 sleep 1

I'm not sure where to start fixing this.

This is the script I saved prior to restarting mysql:

[mysqld]

innodb_rollback_on_timeout=1

innodb_lock_wait_timeout=600

max_connections=350

log-bin=mysql-bin

binlog-format = 'ROW'

Running journalctl -xe | tail -20 gives me this:

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.037709Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.037798Z 0 [Warning] Changed limits: max_connections: 214 (requested 350)

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.037809Z 0 [Warning] Changed limits: table_open_cache: 400 (requested 2000)

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.187886Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.189296Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.15-0ubuntu0.16.04.1-log) starting as process 21937 ...

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.191216Z 0 [ERROR] You have enabled the binary log, but you haven't provided the mandatory server-id. Please refer to the proper server start-up parameters documentation

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.191242Z 0 [ERROR] Aborting

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.191255Z 0 [Note] Binlog end

Sep 26 17:46:29 guest mysqld[21937]: 2016-09-26T09:46:29.191300Z 0 [Note] /usr/sbin/mysqld: Shutdown complete

Sep 26 17:46:29 guest systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE

Sep 26 17:46:32 guest NetworkManager[878]: <info>  [1474883192.2910] device (eth0): Lowering IPv6 MTU (9000) to match device MTU (1500)

Running ulimit && ulimit -Sa gives me:

unlimited

core file size          (blocks, -c) 0

data seg size           (kbytes, -d) unlimited

scheduling priority             (-e) 0

file size               (blocks, -f) unlimited

pending signals                 (-i) 128071

max locked memory       (kbytes, -l) 64

max memory size         (kbytes, -m) unlimited

open files                      (-n) 1024

pipe size            (512 bytes, -p) 8

POSIX message queues     (bytes, -q) 819200

real-time priority              (-r) 0

stack size              (kbytes, -s) 8192

cpu time               (seconds, -t) unlimited

max user processes              (-u) 128071

virtual memory          (kbytes, -v) unlimited

file locks                      (-x) unlimited

Fatal Error:

MYQL is failing to start because as the Journalctl output indicates, but you haven't provided the mandatory server-id. Add the mandatory id as indicated in the code below.

/etc/mysql/mysql.conf.d/mysqld.cnf

Change from:

log-bin=mysql-bin

binlog-format = 'ROW'

Change to:

server-id=master-01

log-bin=mysql-bin

binlog-format = 'ROW'

This will get your server running while you address the proper formatting of your desired logging.

non-fatal warnings:

For the open files limit of your error you will have to either decrease the demand in the configuration you edited or increase the system's limits with:

/etc/security/limits.conf

* soft nofile [new number]

* hard nofile [new number]

The first column describes WHO the limit is to apply for. '' is a wildcard, meaning all users. To raise the limits for root, you have to explicitly enter 'root' instead of ''.

Taken from:
https://askubuntu.com/a/162230/29012

Got the same error, but in my case simply the disk was full. Make also sure to check this.

df -h --total

Resolve the issue by:

1. Adding Swapfile


2. Adding innodb_buffer_pool_size = 20M to configuration file /etc/mysql/my.cnf making sure it is in a group

My problem is the host's IP is changed.

So edit the bind-address in /etc/mysql/my.cnf to the correct one.