2018-02-19T13:24:37.144415Z 0 [Warning] Ignoring user change to 'root' because the user was set to 'mysql' earlier on the command line

2018-02-19T13:24:37.144488Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-02-19T13:24:37.146777Z 0 [Note] mysqld (mysqld 5.7.21-0ubuntu0.16.04.1) starting as process 14724 ...
2018-02-19T13:24:37.152104Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-02-19T13:24:37.152246Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-02-19T13:24:37.152295Z 0 [Note] InnoDB: Uses event mutexes
2018-02-19T13:24:37.152370Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-02-19T13:24:37.152445Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-02-19T13:24:37.152518Z 0 [Note] InnoDB: Using Linux native AIO
2018-02-19T13:24:37.152915Z 0 [Note] InnoDB: Number of pools: 1
2018-02-19T13:24:37.153132Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-02-19T13:24:37.155240Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-02-19T13:24:37.167173Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-02-19T13:24:37.170290Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-02-19T13:24:37.183431Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-02-19T13:24:37.204545Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-02-19T13:24:37.204791Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-02-19T13:24:37.233856Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-02-19T13:24:37.234949Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-02-19T13:24:37.235007Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-02-19T13:24:37.235476Z 0 [Note] InnoDB: Waiting for purge to start
2018-02-19T13:24:37.285709Z 0 [Note] InnoDB: 5.7.21 started; log sequence number 6269407
2018-02-19T13:24:37.289901Z 0 [Note] Plugin 'FEDERATED' is disabled.
2018-02-19T13:24:37.290306Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-02-19T13:24:37.297840Z 0 [Warning] Failed to set up SSL because of the following SSL library error: SSL context is not usable without certificate and private key
2018-02-19T13:24:37.298116Z 0 [ERROR] Could not create unix socket lock file /var/run/mysqld/mysqld.sock.lock.
2018-02-19T13:24:37.298208Z 0 [ERROR] Unable to setup unix socket lock file.
2018-02-19T13:24:37.298293Z 0 [ERROR] Aborting