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POAmazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
 

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  1. POAmazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
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    <p>I have set up a <strong>micro</strong> instance server on EC2 based on what I read <a href="http://bogomip.net/blog/build-an-amazon-ec2-lamp-server/">here</a></p> <p>mysql server fails frequently and for the third time mysql server is gone. The logs only shows </p> <pre><code>120423 09:13:38 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended 120423 09:14:27 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 120423 9:14:27 [Note] Plugin 'FEDERATED' is disabled. 120423 9:14:27 InnoDB: The InnoDB memory heap is disabled 120423 9:14:27 InnoDB: Mutexes and rw_locks use GCC atomic builtins 120423 9:14:27 InnoDB: Compressed tables use zlib 1.2.3 120423 9:14:27 InnoDB: Using Linux native AIO 120423 9:14:27 InnoDB: Initializing buffer pool, size = 512.0M InnoDB: mmap(549453824 bytes) failed; errno 12 120423 9:14:27 InnoDB: Completed initialization of buffer pool 120423 9:14:27 InnoDB: Fatal error: cannot allocate memory for the buffer pool 120423 9:14:27 [ERROR] Plugin 'InnoDB' init function returned error. 120423 9:14:27 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 120423 9:14:27 [ERROR] Unknown/unsupported storage engine: InnoDB 120423 9:14:27 [ERROR] Aborting </code></pre> <p>What is really <code>failed; errno 12</code>? And how could I give more space/memory or whatever needed to make this fixed. </p> <p>I fix this each time by rebooting the whole system and deleting all logs and restart the mysql server. But I know something is wrong with my configuration.</p> <p>Also my `my.cnf' is like below : </p> <pre><code>[mysqld] # Settings user and group are ignored when systemd is used. # If you need to run mysqld under different user or group, # customize your systemd unit file for mysqld according to the # instructions in http://fedoraproject.org/wiki/Systemd # max_allowed_packet=500M datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 innodb_buffer_pool_size = 512M [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid </code></pre>
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    1. COI have the same problem on my EC2 micro instance. Have tried setting innodb_buffer_pool_size=128M and will see how it goes.
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    2. COYou may need to add swap space if you are using a micro instance : http://www.prowebdev.us/2012/05/amazon-ec2-linux-micro-swap-space.html
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    3. COOn EC2 micro Instances there is NO swap space by default and it is needed to be set up manually. Otherwise you may see lots of MySQL crashes due to lack of memory.
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