Starting mysql failed because the control process exited with error code [duplicate]

Question

Ok. First. I tried to run a website on a server but it was too heavy for MySQL to handle. Apparently, it broke due to lack of RAM. So I changed the .cnf and .ini files for the server to lower the load, though I understand that it will work much slower.

Now I try to start the server back again.

$ sudo /etc/init.d/mysql start [....] Starting mysql (via systemctl): mysql.serviceJob for mysql.service failed because the control p rocess exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details. failed! 

For some reason it fails. I am completely out of ideas what is wrong anymore. Here are MySQL logs, what else is I need to fix?

2019-01-31T02:10:13.714141Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 2019-01-31T02:10:13.716372Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.25-0ubuntu0.18.10.2) starting as process 24740 ... 2019-01-31T02:10:13.720956Z 0 [Note] InnoDB: PUNCH HOLE support available 2019-01-31T02:10:13.720991Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins 2019-01-31T02:10:13.720995Z 0 [Note] InnoDB: Uses event mutexes 2019-01-31T02:10:13.720999Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier 2019-01-31T02:10:13.721002Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.11 2019-01-31T02:10:13.721005Z 0 [Note] InnoDB: Using Linux native AIO 2019-01-31T02:10:13.721292Z 0 [Note] InnoDB: Number of pools: 1 2019-01-31T02:10:13.721420Z 0 [Note] InnoDB: Using CPU crc32 instructions 2019-01-31T02:10:13.725482Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M 2019-01-31T02:10:13.725537Z 0 [ERROR] InnoDB: mmap(137428992 bytes) failed; errno 12 2019-01-31T02:10:13.725544Z 0 [ERROR] InnoDB: Cannot allocate memory for the buffer pool 2019-01-31T02:10:13.725548Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error 2019-01-31T02:10:13.725558Z 0 [ERROR] Plugin 'InnoDB' init function returned error. 2019-01-31T02:10:13.725563Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 2019-01-31T02:10:13.725568Z 0 [ERROR] Failed to initialize builtin plugins. 2019-01-31T02:10:13.725571Z 0 [ERROR] Aborting 2019-01-31T02:10:13.728065Z 0 [Note] Binlog end 2019-01-31T02:10:13.728148Z 0 [Note] Shutting down plugin 'CSV' 2019-01-31T02:10:13.728458Z 0 [Note] /usr/sbin/mysqld: Shutdown complete 

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

# # The MySQL database server configuration file. # # You can copy this to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" to set user-specific options. # # One can use all long options that the program supports. # Run program with --help to get a list of available options and with # --print-defaults to see which it would actually understand and use. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # This will be passed to all mysql clients # It has been reported that passwords should be enclosed with ticks/quotes # escpecially if they contain "#" chars... # Remember to edit /etc/mysql/debian.cnf when changing the socket location. # Here is entries for some specific programs # The following values assume you have at least 32M ram [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] # # * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 127.0.0.1 # # * Fine Tuning # key_buffer_size = 16M sort_buffer_size = 16M read_buffer_size = 1M write_buffer_size = 1M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover-options = BACKUP max_connections = 5 table_open_cache = 32 thread_concurrency = 6 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 16M # #thanks https://forums.cpanel.net/threads/optimizing-mysql-for-512mb-80-of-installed-ram.170278/ # table_cache = 256 myisam_sort_buffer_size = 16M thread_cache_size = 8 wait_timeout = 60 connect_timeout = 30 interactive-timeout = 50 query-cache-type = 1 query_cache_size = 8M query_cache_limit = 1M max_user_connections = 5 # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 # # Error log - should be very few entries. # log_error = /var/log/mysql/error.log # # Here you can see queries with especially long duration #slow_query_log = 1 #slow_query_log_file = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # 

i feel like i broke everything...

Answer 1

You have a tiny amount of RAM. Find the my.cnf config file for MySQL, and change innodb_buffer_pool_size down to perhaps 20M. If you still get error 12, then show us that file, and we can recommend decreasing some other things.