How to solve MySQL startup failure due to insufficient memory

[ERROR] InnoDB: mmap(136151040 bytes) failed; errno 12
[ERROR] InnoDB: Cannot allocate memory for the buffer pool
[ERROR] InnoDB: Plugin initialization aborted with error Generic error
[ERROR] Plugin 'InnoDB' init function returned error.
[ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
[ERROR] Failed to initialize plugins.
[ERROR] Aborting

dd if=/dev/zero of=/swapfile bs=1M count=1024
mkswap /swapfile
swapon /swapfile

在文件/etc/fstab中加入 /swapfile swap swap defaults 0 0

service mysql start 启动成功

dd if=/dev/zero of=1.txt bs=1M count=2 生成一个指定大小的空文件if=文件名：输入文件名
of=文件名：输出文件名
bs=字节大小
count=个数