error.log mysql

2017-07-21T13:09:36.562905Z 0 [Note] InnoDB: 5.7.19 started; log sequence number 39159425
2017-07-21T13:09:36.563291Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2017-07-21T13:09:36.564301Z 0 [Note] Plugin 'FEDERATED' is disabled.
2017-07-21T13:09:36.661518Z 0 [Warning] Failed to set up SSL because of the following SSL library error: SSL context is not usable without certificate and private key
2017-07-21T13:09:36.662485Z 0 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306
2017-07-21T13:09:36.662528Z 0 [Note]   - '127.0.0.1' resolves to '127.0.0.1';
2017-07-21T13:09:36.662840Z 0 [Note] Server socket created on IP: '127.0.0.1'.
2017-07-21T13:09:36.664494Z 0 [Note] InnoDB: Buffer pool(s) load completed at 170721  8:09:36
2017-07-21T13:09:36.762743Z 0 [Note] Event Scheduler: Loaded 0 events
2017-07-21T13:09:36.763130Z 0 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.7.19-0ubuntu0.16.04.1'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu)
2017-07-21T13:09:36.763149Z 0 [Note] Executing 'SELECT * FROM INFORMATION_SCHEMA.TABLES;' to get a list of tables using the deprecated partition engine. You may use the startup option '--disable-partition-engine-check' to skip this check.
2017-07-21T13:09:36.763159Z 0 [Note] Beginning of list of non-natively partitioned tables
2017-07-21T13:09:36.885853Z 0 [Note] End of list of non-natively partitioned tables
2017-07-21T13:09:37.446095Z 13 [Note] Access denied for user 'root'@'localhost' (using password: NO)
2017-07-21T13:11:21.834050Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2017-07-21T13:11:21.839614Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
2017-07-21T13:11:23.241472Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2017-07-21T13:11:23.289582Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.19-0ubuntu0.16.04.1) starting as process 7381 ...
2017-07-21T13:11:23.499064Z 0 [Note] InnoDB: PUNCH HOLE support available
2017-07-21T13:11:23.499232Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2017-07-21T13:11:23.499303Z 0 [Note] InnoDB: Uses event mutexes
2017-07-21T13:11:23.499371Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2017-07-21T13:11:23.499424Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2017-07-21T13:11:23.499459Z 0 [Note] InnoDB: Using Linux native AIO
2017-07-21T13:11:23.503721Z 0 [Note] InnoDB: Number of pools: 1
2017-07-21T13:11:23.515068Z 0 [Note] InnoDB: Using CPU crc32 instructions
2017-07-21T13:11:23.537739Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2017-07-21T13:11:23.542834Z 0 [ERROR] InnoDB: mmap(137428992 bytes) failed; errno 12
2017-07-21T13:11:23.542898Z 0 [ERROR] InnoDB: Cannot allocate memory for the buffer pool
2017-07-21T13:11:23.542950Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2017-07-21T13:11:23.545863Z 0 [ERROR] Plugin 'InnoDB' init function returned error.
2017-07-21T13:11:23.545911Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2017-07-21T13:11:23.545941Z 0 [ERROR] Failed to initialize plugins.
2017-07-21T13:11:23.545963Z 0 [ERROR] Aborting

2017-07-21T13:11:23.546003Z 0 [Note] Binlog end
2017-07-21T13:11:23.578252Z 0 [Note] Shutting down plugin 'MyISAM'
2017-07-21T13:11:23.580919Z 0 [Note] /usr/sbin/mysqld: Shutdown complete