There are two reasons for this error “cannot allocate memory for the buffer pool”
1) The system has no enough RAM or SWAP
2) innodb_buffer_pool_size is bigger.
To fix this problem you can try two things
1) Add swap memory.
2) Edit /etc/my.cnf, and add the following line under the [mysqld] heading.
[mysqld]
innodb_buffer_pool_size=64M
Now you can shutdown mysql server and start it again
mysqladmin -uroot -p shutdown
service mysqld start
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