I had this error:
MySQL database "zabbix" on "localhost" is not available: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
but it seemed to disappear
MySQL Error log:
GNU nano 2.9.3 error.log
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Using SSE crc32 instructions
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Completed initialization of buffer pool
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Highest supported file format is Barracuda.
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: 128 rollback segment(s) are active.
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Waiting for purge to start
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.43-84.3 started; log sequence number 15483980222
2019-06-06 6:22:29 140279059229824 [Note] Plugin 'FEEDBACK' is disabled.
2019-06-06 6:22:29 140278388225792 [Note] InnoDB: Dumping buffer pool(s) not yet started
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: innodb_empty_free_list_algorithm has been changed to legacy because of small buffer pool size. In order to use backoff, increase buffer pool at l$
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: The InnoDB memory heap is disabled
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Compressed tables use zlib 1.2.11
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Using Linux native AIO
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Using SSE crc32 instructions
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Completed initialization of buffer pool
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Highest supported file format is Barracuda.
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: 128 rollback segment(s) are active.
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Waiting for purge to start
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.43-84.3 started; log sequence number 15483980232
2019-06-06 6:22:34 140246067195008 [Note] Plugin 'FEEDBACK' is disabled.
2019-06-06 6:22:34 140245395830528 [Note] InnoDB: Dumping buffer pool(s) not yet started
2019-06-06 6:22:34 140246067195008 [Note] Server socket created on IP: '127.0.0.1'.
2019-06-06 6:22:34 140246067195008 [Note] /usr/sbin/mysqld: ready for connections.
Version: '10.1.40-MariaDB-0ubuntu0.18.04.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 Ubuntu 18.04
MySQL database "zabbix" on "localhost" is not available: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
but it seemed to disappear
MySQL Error log:
GNU nano 2.9.3 error.log
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Using SSE crc32 instructions
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Completed initialization of buffer pool
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Highest supported file format is Barracuda.
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: 128 rollback segment(s) are active.
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Waiting for purge to start
2019-06-06 6:22:29 140279059229824 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.43-84.3 started; log sequence number 15483980222
2019-06-06 6:22:29 140279059229824 [Note] Plugin 'FEEDBACK' is disabled.
2019-06-06 6:22:29 140278388225792 [Note] InnoDB: Dumping buffer pool(s) not yet started
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: innodb_empty_free_list_algorithm has been changed to legacy because of small buffer pool size. In order to use backoff, increase buffer pool at l$
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: The InnoDB memory heap is disabled
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Compressed tables use zlib 1.2.11
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Using Linux native AIO
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Using SSE crc32 instructions
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Completed initialization of buffer pool
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Highest supported file format is Barracuda.
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: 128 rollback segment(s) are active.
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Waiting for purge to start
2019-06-06 6:22:34 140246067195008 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.43-84.3 started; log sequence number 15483980232
2019-06-06 6:22:34 140246067195008 [Note] Plugin 'FEEDBACK' is disabled.
2019-06-06 6:22:34 140245395830528 [Note] InnoDB: Dumping buffer pool(s) not yet started
2019-06-06 6:22:34 140246067195008 [Note] Server socket created on IP: '127.0.0.1'.
2019-06-06 6:22:34 140246067195008 [Note] /usr/sbin/mysqld: ready for connections.
Version: '10.1.40-MariaDB-0ubuntu0.18.04.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 Ubuntu 18.04
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