Debian 9：從 8 升級後，MySQL (MariaDB) 不再工作

我剛剛從 Debian 8 升級到 9。

顯然，它破壞了與數據庫相關的所有內容。我現在無法啟動 MySQL，錯誤是：

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")

服務狀態：

systemctl status mariadb.service

顯示錯誤：

● mariadb.service - MariaDB database server
  Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
  Active: failed (Result: exit-code) since Fri 2018-02-02 16:55:27 AEST; 35s ago
 Process: 6859 ExecStartPost=/etc/mysql/debian-start (code=exited, status=203/EXEC)
 Process: 6832 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=0/SUCCESS)
 Process: 6821 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS)
 Process: 6815 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
 Process: 6814 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld (code=exited, status=0/SUCCESS)
Main PID: 6832 (code=exited, status=0/SUCCESS)
  Status: "MariaDB server is down"

2 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495303359232 [Note] /usr/sbin/mysqld: Normal shutdown
2 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495303359232 [Note] Event Scheduler: Purging the queue. 0 events
2 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140494621349632 [Note] InnoDB: FTS optimize thread exiting.
2 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495303359232 [Note] InnoDB: Starting shutdown...
2 02 16:55:26 doraemoe mysqld[6832]: 2018-02-02 16:55:26 140495303359232 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2 02 16:55:27 doraemoe mysqld[6832]: 2018-02-02 16:55:27 140495303359232 [Note] InnoDB: Shutdown completed; log sequence number 1616889
2 02 16:55:27 doraemoe mysqld[6832]: 2018-02-02 16:55:27 140495303359232 [Note] /usr/sbin/mysqld: Shutdown complete
2 02 16:55:27 doraemoe systemd[1]: Failed to start MariaDB database server.
2 02 16:55:27 doraemoe systemd[1]: mariadb.service: Unit entered failed state.
2 02 16:55:27 doraemoe systemd[1]: mariadb.service: Failed with result 'exit-code'.

另一種獲取資訊的方法：

journalctl -xe` that maybe useful: `2 02 16:42:39 doraemoe systemd[5505]: mariadb.service: Failed at step EXEC spawning /etc/mysql/debian-start: No such file or directory

我如何解決它？

編輯：這裡是完整的輸出journalctl -u mariadb.service

Logs begin at Fri 2018-02-02 16:36:33 AEST, end at Fri 2018-02-02 19:05:01 AEST. 
2月 02 16:36:35 doraemoe systemd[1]: Starting MariaDB database server...
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] /usr/sbin/mysqld (mysqld 10.1.26-MariaDB-0+deb9u1) starting as process 3534 ...
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [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 least up to 20MB.
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: The InnoDB memory heap is disabled
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Compressed tables use zlib 1.2.8
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Using Linux native AIO
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Using SSE crc32 instructions
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Completed initialization of buffer pool
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Highest supported file format is Barracuda.
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: 128 rollback segment(s) are active.
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB: Waiting for purge to start
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] InnoDB:  Percona XtraDB (http://www.percona.com) 5.6.36-82.1 started; log sequence number 1616859
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] Plugin 'FEEDBACK' is disabled.
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] Server socket created on IP: '::'.
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139855396824832 [Note] InnoDB: Dumping buffer pool(s) not yet started
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856107147840 [Note] /usr/sbin/mysqld: ready for connections.
2月 02 16:36:36 doraemoe mysqld[3534]: Version: '10.1.26-MariaDB-0+deb9u1'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  Debian 9.1
2月 02 16:36:36 doraemoe systemd[3810]: mariadb.service: Failed at step EXEC spawning /etc/mysql/debian-start: No such file or directory
2月 02 16:36:36 doraemoe systemd[1]: mariadb.service: Control process exited, code=exited status=203
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856106375936 [Note] /usr/sbin/mysqld: Normal shutdown
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856106375936 [Note] Event Scheduler: Purging the queue. 0 events
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139855422002944 [Note] InnoDB: FTS optimize thread exiting.
2月 02 16:36:36 doraemoe mysqld[3534]: 2018-02-02 16:36:36 139856106375936 [Note] InnoDB: Starting shutdown...
2月 02 16:36:37 doraemoe mysqld[3534]: 2018-02-02 16:36:37 139856106375936 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2月 02 16:36:39 doraemoe mysqld[3534]: 2018-02-02 16:36:39 139856106375936 [Note] InnoDB: Shutdown completed; log sequence number 1616869
2月 02 16:36:39 doraemoe mysqld[3534]: 2018-02-02 16:36:39 139856106375936 [Note] /usr/sbin/mysqld: Shutdown complete
2月 02 16:36:39 doraemoe systemd[1]: Failed to start MariaDB database server.
2月 02 16:36:39 doraemoe systemd[1]: mariadb.service: Unit entered failed state.
2月 02 16:36:39 doraemoe systemd[1]: mariadb.service: Failed with result 'exit-code'.
2月 02 16:42:39 doraemoe systemd[1]: Starting MariaDB database server...
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] /usr/sbin/mysqld (mysqld 10.1.26-MariaDB-0+deb9u1) starting as process 5478 ...
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [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 least up to 20MB.
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: The InnoDB memory heap is disabled
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Compressed tables use zlib 1.2.8
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Using Linux native AIO
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Using SSE crc32 instructions
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Completed initialization of buffer pool
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Highest supported file format is Barracuda.
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: 128 rollback segment(s) are active.
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB: Waiting for purge to start
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] InnoDB:  Percona XtraDB (http://www.percona.com) 5.6.36-82.1 started; log sequence number 1616869
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] Plugin 'FEEDBACK' is disabled.
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140596496787200 [Note] InnoDB: Dumping buffer pool(s) not yet started
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] Server socket created on IP: '::'.
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597204075072 [Note] /usr/sbin/mysqld: ready for connections.
2月 02 16:42:39 doraemoe mysqld[5478]: Version: '10.1.26-MariaDB-0+deb9u1'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  Debian 9.1
2月 02 16:42:39 doraemoe systemd[5505]: mariadb.service: Failed at step EXEC spawning /etc/mysql/debian-start: No such file or directory
2月 02 16:42:39 doraemoe systemd[1]: mariadb.service: Control process exited, code=exited status=203
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597203303168 [Note] /usr/sbin/mysqld: Normal shutdown
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597203303168 [Note] Event Scheduler: Purging the queue. 0 events
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140596521965312 [Note] InnoDB: FTS optimize thread exiting.
2月 02 16:42:39 doraemoe mysqld[5478]: 2018-02-02 16:42:39 140597203303168 [Note] InnoDB: Starting shutdown...
2月 02 16:42:40 doraemoe mysqld[5478]: 2018-02-02 16:42:40 140597203303168 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2月 02 16:42:42 doraemoe mysqld[5478]: 2018-02-02 16:42:42 140597203303168 [Note] InnoDB: Shutdown completed; log sequence number 1616879
2月 02 16:42:42 doraemoe mysqld[5478]: 2018-02-02 16:42:42 140597203303168 [Note] /usr/sbin/mysqld: Shutdown complete
2月 02 16:42:42 doraemoe systemd[1]: Failed to start MariaDB database server.
2月 02 16:42:42 doraemoe systemd[1]: mariadb.service: Unit entered failed state.
2月 02 16:42:42 doraemoe systemd[1]: mariadb.service: Failed with result 'exit-code'.
2月 02 16:55:24 doraemoe systemd[1]: Starting MariaDB database server...
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] /usr/sbin/mysqld (mysqld 10.1.26-MariaDB-0+deb9u1) starting as process 6832 ...
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [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 least up to 20MB.
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: The InnoDB memory heap is disabled
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: Compressed tables use zlib 1.2.8
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: Using Linux native AIO
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: Using SSE crc32 instructions
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: Completed initialization of buffer pool
2月 02 16:55:24 doraemoe mysqld[6832]: 2018-02-02 16:55:24 140495304131136 [Note] InnoDB: Highest supported file format is Barracuda.
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495304131136 [Note] InnoDB: 128 rollback segment(s) are active.
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495304131136 [Note] InnoDB: Waiting for purge to start
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495304131136 [Note] InnoDB:  Percona XtraDB (http://www.percona.com) 5.6.36-82.1 started; log sequence number 1616879
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495304131136 [Note] Plugin 'FEEDBACK' is disabled.
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140494596171520 [Note] InnoDB: Dumping buffer pool(s) not yet started
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495304131136 [Note] Server socket created on IP: '::'.
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495304131136 [Note] /usr/sbin/mysqld: ready for connections.
2月 02 16:55:25 doraemoe mysqld[6832]: Version: '10.1.26-MariaDB-0+deb9u1'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  Debian 9.1
2月 02 16:55:25 doraemoe systemd[6859]: mariadb.service: Failed at step EXEC spawning /etc/mysql/debian-start: No such file or directory
2月 02 16:55:25 doraemoe systemd[1]: mariadb.service: Control process exited, code=exited status=203
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495303359232 [Note] /usr/sbin/mysqld: Normal shutdown
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495303359232 [Note] Event Scheduler: Purging the queue. 0 events
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140494621349632 [Note] InnoDB: FTS optimize thread exiting.
2月 02 16:55:25 doraemoe mysqld[6832]: 2018-02-02 16:55:25 140495303359232 [Note] InnoDB: Starting shutdown...
2月 02 16:55:26 doraemoe mysqld[6832]: 2018-02-02 16:55:26 140495303359232 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2月 02 16:55:27 doraemoe mysqld[6832]: 2018-02-02 16:55:27 140495303359232 [Note] InnoDB: Shutdown completed; log sequence number 1616889
2月 02 16:55:27 doraemoe mysqld[6832]: 2018-02-02 16:55:27 140495303359232 [Note] /usr/sbin/mysqld: Shutdown complete
2月 02 16:55:27 doraemoe systemd[1]: Failed to start MariaDB database server.
2月 02 16:55:27 doraemoe systemd[1]: mariadb.service: Unit entered failed state.
2月 02 16:55:27 doraemoe systemd[1]: mariadb.service: Failed with result 'exit-code'.

執行/etc/init.d/mysql start結果：

[....] Starting mysql (via systemctl): mysql.serviceJob for mariadb.service failed because the control process exited with error code.
See "systemctl status mariadb.service" and "journalctl -xe" for details.
failed!

我找不到一個名為mysql.err並且ps -aux|grep -i maria沒有結果的文件。

由於某種原因，您沒有文件/etc/mysql/debian-start，這是給出的錯誤：

16:55:25 doraemoe systemd[6859]: mariadb.service: Failed at step EXEC spawning /etc/mysql/debian-start: No such file or directory

我已經檢查了我的安裝，mariadb並且該文件是mariadb-server-10.1軟體包的一部分。檢查是否有/etc/mysql/debian-start.dpkg-dist或類似的，如果有，將其重命名為/etc/mysql/debian-start.

否則，請檢查您安裝的確切軟體包名稱：

dpkg -S /usr/bin/mysqld_safe

mariadb-server-10.1: /usr/bin/mysqld_safe

下載包 .deb（例如通過這個頁面），解壓它：

dpkg-deb --extract mariadb-server-10.1_10.1.26-0+deb9u1_amd64.deb /tmp/mariadb-server

（替換您下載的文件的名稱）然後復製文件：

cp /tmp/mariadb-server/etc/mysql/debian-start /etc/mysql/

然後您應該能夠啟動它；除非有更多的文件失去。奇怪的是，這個文件應該失去了，所以在某個階段出了點問題。

引用自：https://unix.stackexchange.com/questions/421366