ผมลองเช็ค mysqld.log แล้วมันบอกว่า
150427 01:53:20 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
150427 1:53:20 [Warning] option 'max_connections': unsigned value 288000 adjusted to 100000
150427 1:53:20 [Note] /usr/libexec/mysqld (mysqld 5.5.43) starting as process 9650 ...
150427 1:53:20 [Note] Plugin 'FEDERATED' is disabled.
150427 1:53:20 InnoDB: The InnoDB memory heap is disabled
150427 1:53:20 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150427 1:53:20 InnoDB: Compressed tables use zlib 1.2.3
150427 1:53:20 InnoDB: Using Linux native AIO
150427 1:53:20 InnoDB: Initializing buffer pool, size = 128.0M
150427 1:53:20 InnoDB: Completed initialization of buffer pool
150427 1:53:20 InnoDB: Log file ./ib_logfile0 did not exist: new to be created
InnoDB: Setting log file ./ib_logfile0 size to 128 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
150427 1:53:22 InnoDB: Log file ./ib_logfile1 did not exist: new to be created
InnoDB: Setting log file ./ib_logfile1 size to 128 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
150427 1:53:25 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
150427 1:53:25 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
150427 1:53:25 InnoDB: Waiting for the background threads to start
150427 1:53:26 InnoDB: 5.5.43 started; log sequence number 16819896844
150427 1:53:26 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
150427 1:53:26 [Note] - '0.0.0.0' resolves to '0.0.0.0';
150427 1:53:26 [Note] Server socket created on IP: '0.0.0.0'.
150427 1:53:26 [Note] Event Scheduler: Loaded 0 events
150427 1:53:26 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.5.43' socket: '/var/lib/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL) by Remi
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