2018-12-25 14:49:57 25873 [Note] Plugin ‘FEDERATED’ is disabled.
2018-12-25 14:49:57 25873 [Note] InnoDB: Using atomics to ref count buffer pool pages
2018-12-25 14:49:57 25873 [Note] InnoDB: The InnoDB memory heap is disabled
2018-12-25 14:49:57 25873 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-12-25 14:49:57 25873 [Note] InnoDB: Memory barrier is not used
2018-12-25 14:49:57 25873 [Note] InnoDB: Compressed tables use zlib 1.2.11
2018-12-25 14:49:57 25873 [Note] InnoDB: Using Linux native AIO
2018-12-25 14:49:57 25873 [Note] InnoDB: Using CPU crc32 instructions
2018-12-25 14:49:57 25873 [Note] InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137363456 bytes) failed; errno 12
2018-12-25 14:49:57 25873 [ERROR] InnoDB: Cannot allocate memory for the buffer pool
2018-12-25 14:49:57 25873 [ERROR] Plugin ‘InnoDB’ init function returned error.
2018-12-25 14:49:57 25873 [ERROR] Plugin ‘InnoDB’ registration as a STORAGE ENGINE failed.
2018-12-25 14:49:57 25873 [ERROR] Unknown/unsupported storage engine: InnoDB
2018-12-25 14:49:57 25873 [ERROR] Aborting
2018-12-25 14:49:57 25873 [Note] Binlog end
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘partition’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_DATAFILES’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_TABLESPACES’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_FOREIGN_COLS’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_FOREIGN’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_FIELDS’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_COLUMNS’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_INDEXES’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_TABLESTATS’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_SYS_TABLES’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_FT_INDEX_TABLE’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_FT_INDEX_CACHE’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_FT_CONFIG’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_FT_BEING_DELETED’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_FT_DELETED’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_FT_DEFAULT_STOPWORD’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_METRICS’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_BUFFER_POOL_STATS’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_BUFFER_PAGE_LRU’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_BUFFER_PAGE’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_CMP_PER_INDEX_RESET’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_CMP_PER_INDEX’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_CMPMEM_RESET’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_CMPMEM’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_CMP_RESET’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_CMP’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_LOCK_WAITS’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_LOCKS’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘INNODB_TRX’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘PERFORMANCE_SCHEMA’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘BLACKHOLE’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘ARCHIVE’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘MyISAM’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘CSV’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘MEMORY’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘MRG_MYISAM’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘sha256_password’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘mysql_old_password’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘mysql_native_password’
2018-12-25 14:49:57 25873 [Note] Shutting down plugin ‘binlog’
2018-12-25 14:49:57 25873 [Note] /usr/sbin/mysqld: Shutdown complete
之前一直动不动mysql隔一段时间就挂掉，因为对服务器上mysql的文件不太熟悉，找了很多帖子也没看到原因。
下面记录一下我解决的经历
service mysqld start 启动失败
1.先进入到 var/log/mysql.log （安装的时候linux上默认的路径）
2. 查看mysql的日志，会发现最近日志的错误记录，为啥失败
3. 以上是我的错误日志，百度后发现是mysql的默认INNODB分配内存大小为128M，而我买的是最初级的服务器，内存比较小，所有需要调整内存
4. 进入etc/my.cnf windos系统下配置文件为my.ini
5. 编辑my.cnf文件 ，在mysql下加入：
innodb_buffer_pool_size=50M
6. 保存，启动serivce mysqld start 成功
7. 当时对这些mysql配置文件不熟，现在想想这问题也挺简单，耽误这么多时间真的是够了。
8.