```
-- Logs begin at Wed 2020-05-27 05:53:35 UTC, end at Wed 2020-05-27 06:01:56 UTC. --
May 27 05:58:13 clouddb1001 systemd[1]: Starting mariadb database server...
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] /opt/wmf-mariadb101/bin/mysqld (mysqld 10.1.39-MariaDB) starting as process 1923 ...
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [ERROR] Plugin 'unix_socket' already installed
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] mysqld: Aria engine: starting recovery
May 27 05:58:14 clouddb1001 mysqld[1923]: recovered pages: 0% 52% 100% (0.0 seconds); tables to flush: 5 4 3 2 1 0 (0.0 seconds);
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] mysqld: Aria engine: recovery done
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] InnoDB: Using mutexes to ref count buffer pool pages
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] InnoDB: The InnoDB memory heap is disabled
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] InnoDB: Compressed tables use zlib 1.2.11
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] InnoDB: Using Linux native AIO
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] InnoDB: Using SSE crc32 instructions
May 27 05:58:14 clouddb1001 mysqld[1923]: 2020-05-27 5:58:14 140561590362560 [Note] InnoDB: Initializing buffer pool, size = 31.0G
May 27 05:58:16 clouddb1001 mysqld[1923]: 2020-05-27 5:58:16 140561590362560 [Note] InnoDB: Completed initialization of buffer pool
May 27 05:58:16 clouddb1001 mysqld[1923]: 2020-05-27 5:58:16 140561590362560 [Note] InnoDB: Highest supported file format is Barracuda.
May 27 05:58:16 clouddb1001 mysqld[1923]: 2020-05-27 5:58:16 140561590362560 [Note] InnoDB: Starting crash recovery from checkpoint LSN=50443047733924
May 27 05:58:24 clouddb1001 mysqld[1923]: 2020-05-27 5:58:24 140561590362560 [Note] InnoDB: Restoring possible half-written data pages from the doublewrite buffer...
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553384 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553393 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232551956 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553400 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553403 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553474 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553478 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553476 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553482 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553506 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553540 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553795 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553731 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553732 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553759 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553767 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553770 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553813 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553856 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553882 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553918 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553987 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232554038 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232554040 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232554041 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232553991 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232554022 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232554069 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232554080 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232554096 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232550766 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232550766 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Transaction 53232554747 was in the XA prepared state.
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: 36 transaction(s) which must be rolled back or cleaned up
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: in total 4715 row operations to undo
May 27 05:58:26 clouddb1001 mysqld[1923]: InnoDB: Trx id counter is 53232573696
May 27 05:58:26 clouddb1001 mysqld[1923]: 2020-05-27 5:58:26 140561590362560 [Note] InnoDB: Starting final batch to recover 14120 pages from redo log
May 27 05:58:31 clouddb1001 mysqld[1923]: InnoDB: Last MySQL binlog file position 0 83484603, file name /srv/labsdb/binlogs/log.209037
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140561590362560 [Note] InnoDB: 128 rollback segment(s) are active.
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140524866500352 [Note] InnoDB: Starting in background the rollback of recovered transactions
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140524866500352 [Note] InnoDB: To roll back: 4 transactions, 4715 rows
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140561590362560 [Note] InnoDB: Waiting for purge to start
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140524866500352 [Note] InnoDB: Rollback of trx with id 53232564680 completed
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140524866500352 [Note] InnoDB: Rollback of trx with id 53232564390 completed
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140524866500352 [Note] InnoDB: Rollback of trx with id 53232554087 completed
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140561590362560 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.43-84.3 started; log sequence number 50443085726861
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140524866500352 [Note] InnoDB: Rollback of trx with id 53232540583 completed
May 27 05:58:43 clouddb1001 mysqld[1923]: 2020-05-27 5:58:43 140524866500352 [Note] InnoDB: Rollback of non-prepared transactions completed
May 27 05:58:52 clouddb1001 mysqld[1923]: 2020-05-27 5:58:52 140524866500352 [Note] InnoDB: Dumping buffer pool(s) not yet started
May 27 05:58:52 clouddb1001 mysqld[1923]: 2020-05-27 05:58:52 7fce7ebff700 InnoDB: Loading buffer pool(s) from .//ib_buffer_pool
May 27 05:58:52 clouddb1001 mysqld[1923]: 2020-05-27 5:58:52 140561590362560 [Note] Recovering after a crash using /srv/labsdb/binlogs/log
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140561590362560 [ERROR] Error in Log_event::read_log_event(): 'Event invalid', data_len: 0, event_type: 0
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140561590362560 [Note] Starting crash recovery...
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Starting recovery for XA transactions...
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232554747 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232554096 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232554080 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232554069 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232554041 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232554040 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232554038 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232554022 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553991 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553987 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553918 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553882 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553856 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553813 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553795 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553770 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553767 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553759 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553732 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553731 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553540 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553506 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553482 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553478 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553476 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553474 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553403 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553400 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553393 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 34 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232553384 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 1 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232551956 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 10 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction 53232550766 in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: Transaction contains changes to 464 rows
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fd70ba9a1c0 InnoDB: 32 transactions in prepared state after recovery
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140561590362560 [Note] Found 32 prepared transaction(s) in InnoDB
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140561590362560 [Note] Crash recovery finished.
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140561590362560 [Note] Server socket created on IP: '::'.
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140561590362560 [ERROR] Can't start server : Bind on unix socket: No such file or directory
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140561590362560 [ERROR] Do you already have another mysqld server running on socket: /var/run/mysqld/mysqld.sock ?
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140561590362560 [ERROR] Aborting
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 05:58:53 7fce7ebff700 InnoDB: Buffer pool(s) load completed at 200527 5:58:53
May 27 05:58:53 clouddb1001 mysqld[1923]: 2020-05-27 5:58:53 140524866500352 [Warning] InnoDB: Dumping buffer pool(s) to .//ib_buffer_pool
May 27 05:58:54 clouddb1001 mysqld[1923]: 2020-05-27 5:58:54 140524866500352 [Warning] InnoDB: Buffer pool(s) dump completed at 200527 5:58:54
May 27 05:58:57 clouddb1001 systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE
May 27 05:58:57 clouddb1001 systemd[1]: Failed to start mariadb database server.
May 27 05:58:57 clouddb1001 systemd[1]: mariadb.service: Unit entered failed state.
May 27 05:58:57 clouddb1001 systemd[1]: mariadb.service: Failed with result 'exit-code'.
```