Wordpress Server Crashes, Ubuntu 16.04.3 LTS, access denied error

Hello,

I have a website that crashes probably weekly. I checked the error logs and it looks like it’s an access issue. Still new to ubuntu, linux, and back-end work, so any help would be much appreciated.

Box: No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.3 LTS Release: 16.04 Codename: xenial

tail -40 /var/log/mysql/error.log

Error Log: 2019-05-13T11:54:50.669077Z 2 [Note] Access denied for user ‘root’@‘localhost’ (using password: NO) 2019-05-18T18:04:41.576981Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000) 2019-05-18T18:04:41.589442Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000) 2019-05-18T18:04:43.872335Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 2019-05-18T18:04:43.900979Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.25-0ubuntu0.16.04.2) starting as process 1442 … 2019-05-18T18:04:43.954087Z 0 [Note] InnoDB: PUNCH HOLE support available 2019-05-18T18:04:43.954139Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins 2019-05-18T18:04:43.954147Z 0 [Note] InnoDB: Uses event mutexes 2019-05-18T18:04:43.954214Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier 2019-05-18T18:04:43.954227Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.8 2019-05-18T18:04:43.954234Z 0 [Note] InnoDB: Using Linux native AIO 2019-05-18T18:04:43.956877Z 0 [Note] InnoDB: Number of pools: 1 2019-05-18T18:04:43.959548Z 0 [Note] InnoDB: Using CPU crc32 instructions 2019-05-18T18:04:44.005443Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M 2019-05-18T18:04:44.138851Z 0 [Note] InnoDB: Completed initialization of buffer pool 2019-05-18T18:04:44.179508Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority(). 2019-05-18T18:04:44.212889Z 0 [Note] InnoDB: Highest supported file format is Barracuda. 2019-05-18T18:04:44.221553Z 0 [Note] InnoDB: Log scan progressed past the checkpoint lsn 2995825286 2019-05-18T18:04:44.221593Z 0 [Note] InnoDB: Doing recovery: scanned up to log sequence number 2995825295 2019-05-18T18:04:44.221604Z 0 [Note] InnoDB: Database was not shutdown normally! 2019-05-18T18:04:44.221619Z 0 [Note] InnoDB: Starting crash recovery. 2019-05-18T18:04:44.414438Z 0 [Note] InnoDB: Removed temporary tablespace data file: “ibtmp1” 2019-05-18T18:04:44.414488Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables 2019-05-18T18:04:44.414690Z 0 [Note] InnoDB: Setting file ‘./ibtmp1’ size to 12 MB. Physically writing the file full; Please wait … 2019-05-18T18:04:44.506934Z 0 [Note] InnoDB: File ‘./ibtmp1’ size is now 12 MB. 2019-05-18T18:04:44.508474Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active. 2019-05-18T18:04:44.508491Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active. 2019-05-18T18:04:44.510921Z 0 [Note] InnoDB: Waiting for purge to start 2019-05-18T18:04:44.561531Z 0 [Note] InnoDB: 5.7.25 started; log sequence number 2995825295 2019-05-18T18:04:44.563157Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool 2019-05-18T18:04:44.563684Z 0 [Note] Plugin ‘FEDERATED’ is disabled. 2019-05-18T18:04:44.616975Z 0 [Note] InnoDB: Buffer pool(s) load completed at 190518 18:04:44 2019-05-18T18:04:44.624628Z 0 [Warning] Failed to set up SSL because of the following SSL library error: SSL context is not usable without certificate and private key 2019-05-18T18:04:44.624659Z 0 [Note] Server hostname (bind-address): ‘127.0.0.1’; port: 3306 2019-05-18T18:04:44.624694Z 0 [Note] - ‘127.0.0.1’ resolves to ‘127.0.0.1’; 2019-05-18T18:04:44.624757Z 0 [Note] Server socket created on IP: ‘127.0.0.1’. 2019-05-18T18:04:44.694594Z 0 [Note] Event Scheduler: Loaded 0 events 2019-05-18T18:04:44.696204Z 0 [Note] /usr/sbin/mysqld: ready for connections. Version: ‘5.7.25-0ubuntu0.16.04.2’ socket: ‘/var/run/mysqld/mysqld.sock’ port: 3306 (Ubuntu) 2019-05-18T18:04:45.031568Z 2 [Note] Access denied for user ‘root’@‘localhost’ (using password: NO)