问 题

mysql时不时挂掉，无法启动，请问是什么原因啊？

my.cnf配置：

[client]

port = 3306

socket = /tmp/mysql.sock

[mysqld]

port = 3306

socket = /tmp/mysql.sock

skip-external-locking

log-error=/alidata/log/mysql/error.log

key_buffer_size = 16M

max_allowed_packet = 1M

table_open_cache = 64

sort_buffer_size = 512K

net_buffer_length = 8K

read_buffer_size = 256K

read_rnd_buffer_size = 512K

myisam_sort_buffer_size = 8M

skip-name-resolve

log-bin=mysql-bin

binlog_format=mixed

server-id = 1

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

[mysqldump]

quick

max_allowed_packet = 16M

[mysql]

no-auto-rehash

[myisamchk]

key_buffer_size = 20M

sort_buffer_size = 20M

read_buffer = 2M

write_buffer = 2M

[mysqlhotcopy]

interactive-timeout

expire_logs_days = 5

max_binlog_size = 1000M

错误日志log:

170421 14:16:49 mysqld_safe Number of processes running now: 0

170421 14:16:49 mysqld_safe mysqld restarted

2017-04-21 14:16:49 1480 [Note] Plugin 'FEDERATED' is disabled.

2017-04-21 14:16:49 1480 [Note] InnoDB: Using atomics to ref count buffer pool pages

2017-04-21 14:16:49 1480 [Note] InnoDB: The InnoDB memory heap is disabled

2017-04-21 14:16:49 1480 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2017-04-21 14:16:49 1480 [Note] InnoDB: Memory barrier is not used

2017-04-21 14:16:49 1480 [Note] InnoDB: Compressed tables use zlib 1.2.3

2017-04-21 14:16:49 1480 [Note] InnoDB: Using Linux native AIO

2017-04-21 14:16:49 1480 [Note] InnoDB: Using CPU crc32 instructions

2017-04-21 14:16:49 1480 [Note] InnoDB: Initializing buffer pool, size = 128.0M

InnoDB: mmap(137363456 bytes) failed; errno 12

2017-04-21 14:16:49 1480 [ERROR] InnoDB: Cannot allocate memory for the buffer pool

2017-04-21 14:16:49 1480 [ERROR] Plugin 'InnoDB' init function returned error.

2017-04-21 14:16:49 1480 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.

2017-04-21 14:16:49 1480 [ERROR] Unknown/unsupported storage engine: InnoDB

2017-04-21 14:16:49 1480 [ERROR] Aborting

2017-04-21 14:16:49 1480 [Note] Binlog end

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'partition'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'BLACKHOLE'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_SYS_TABLES'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_FT_CONFIG'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_FT_DELETED'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_METRICS'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_CMPMEM'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_CMP_RESET'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_CMP'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_LOCKS'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'INNODB_TRX'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'ARCHIVE'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'MyISAM'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'CSV'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'MRG_MYISAM'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'MEMORY'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'sha256_password'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'mysql_old_password'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'mysql_native_password'

2017-04-21 14:16:49 1480 [Note] Shutting down plugin 'binlog'

2017-04-21 14:16:49 1480 [Note] /alidata/server/mysql/bin/mysqld: Shutdown complete

170421 14:16:49 mysqld_safe mysqld from pid file /alidata/server/mysql/data/iZ23czua4kgZ.pid ended

解决方案

内存不够了 都没看到你配置的mysql内存多少 一般占用os的75%

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