Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
I have set up a micro instance server on EC2 based on what I read here
mysql server fails frequently and for the third time mysql server is gone. The logs only shows
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
What is really
failed; errno 12? And how could I give more space/memory or whatever needed to make this fixed.
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.
Also my `my.cnf' is like below :
[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
I met the same problem when I tried to run a wordpress on my micro instance without RDS.
Adding a Swap page solved the problem for me.
You can follow steps below to setup the swap space.
If it still doesn't work for you, consider using the RDS service.
I copied the content of the blog for the record. Credit goes to the blog author pmoubed:
Amazon EC2 Micro Instance Swap Space - Linux
I have a Amazon EC2 Linux Micro instance. Since Micro instances have only 613MB of memory, MySQL crashed every now and then. After a long search about MySQL, Micro Instance and Memory Managment I found out there is no default SWAP space for Micro instance. So if you want to avoid the crash you may need to setup a swap space for your micro instance. Actually performance wise is better to enable swap.
Steps below show how to make a swap space for your Micro instance. I assume you have AWS Account with a Micro instance running.
dd if=/dev/zero of=/swapfile bs=1M count=1024
- Add this line
/swapfile swap swap defaults 0 0to
Step 4 is needed if you would like to automatically enable swap file after each reboot.
Some useful command related to SWAP space:
$ swapon -s $ free -k $ swapoff -a $ swapon -a
MySQL InnoDB: mmap(137363456 bytes) failed; errno 12, What is really failed; errno 12? And how could I give more space/memory or whatever needed to make this fixed. I fix this each time by rebooting� 160103 04:26:52 mysqld_safe Number of processes running now: 0 160103 04:26:52 mysqld_safe mysqld restarted 160103 4:26:54 [Note] Plugin 'FEDERATED' is disabled. 160103 4:26:54 InnoDB: The InnoDB memory heap is disabled 160103 4:26:54 InnoDB: Mutexes and rw_locks use GCC atomic builtins 160103 4:26:54 InnoDB: Compressed tables use zlib 1.2.7
I had this problem too on an Amazon EC2 micro instance. I tried decreasing inno_db's memory usage by adding the following to
innodb_buffer_pool_size = 64M
That didn't work, I tried dropping it down to 16M and it still didnt work. Then I realized that the instance had basically zero free memory. So I tried restarting apache
sudo system httpd restart sudo system mysqld restart
And everything worked fine. Maybe another solution is to configure apache to not eat up so much memory somehow.
Amazon EC2, mysql aborting start, protože InnoDB: mmap (x bytes), Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12 – Stack Overflow. Hits: 486. I have set up a micro instance� Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12. Amazon EC2 MySQL Failed to Start. asked Jul 31, 2019 in AWS by yuvraj (19.2k points)
It looks like you are requesting 128M of memory for the innodb_buffer_pool_size in the my.cfg file you show in the post, but MySQL thinks you are asking for 512M of memory:
Initializing buffer pool, size = 512.0M
A few lines down, the error message tells you MySQL will not start because it cannot reserve enough (512M) memory for the InnoDB buffer pool:
Fatal error: cannot allocate memory for the buffer pool
That begs three questions:
- How much memory is on your instance? Should there be enough memory to accommodate the 512M InnoDB is trying to grab for the buffer pool, plus everything else MySQL allocates, plus your application(s), plus the operating system?
- Why is InnoDB trying to take more than you think it should?
- Why is MySQL restarting anyhow?
You can answer 1.
As to 2., there are a few different places MySQL option files can be located. Subsequently found files override options specified in previously found files. See
Issue 3. could be due to an out of memory condition that occurs sometime after startup. You should see an indication of that further back in the logs if that is the case.
Finally, but somewhat unrelated, are you using EBS backed instances? That's generally highly recommended for database servers (actually, for any instance barring special circumstances). For more on that see
The error log is pretty similar to this one: Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12 I tried to create the swap file,� Amazon EC2 MySQL Failed to Start. 0 votes . 1 view. asked Jul 31, 2019 in AWS by yuvraj Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed
For me, this exactly problem was rectified by adding a swap volume to my EC2 instance. My services were simply consuming all the memory on the box, and would crash. Not something I was used to, being a RedHat/CentOS admin for years - Anaconda does a LOT of work that the free Ubuntu EC2 instance does not.
I simply created a 2Gb volume through the web console, attached it to my instance, and did "mkswap /dev/[whatever]", edited /etc/fstab, and the crashing stopped.
These instances do NOT install like a media-based OS install that most of us are used to - it's stripped bare with no packages, no proper filesystem, and things like AppArmor, which cause all kinds of problems if you aren't aware of it and/or don't know how to configure it.
The problem started on a Amazon EC2 micro instance (1 GB ram), running a EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12 I tried � Amazon EC2, mysql aborting start because InnoDB: mmap(x bytes) failed; errno 12 (4) For me, this exactly problem was rectified by adding a swap volume to my EC2 instance. My services were simply consuming all the memory on the box, and would crash.
The problem is that the server does not have enough memory to allocate for MySQL process. There are a few solutions to this problem.
(1) Increase the physical RAM. Adding 1GB of additional RAM will solve the problem. (2) Allocate SWAP space. Digital Ocean VPS instance is not configured to use swap space by default. By allocating 512MB of swap space, we were able to solve this problem. To add swap space to your server, please follow the following steps:
## As a root user, perform the following: # dd if=/dev/zero of=/swap.dat bs=1024 count=512M # mkswap /swap.dat # swapon /swap.dat ## Edit the /etc/fstab, and the following entry. /swap.dat none swap sw 0 0
Amazon EC2, mysql aborting start, protože InnoDB: mmap (x bytes) selhal; errno InnoDB: mmap(549453824 bytes) failed; errno 12 120423 9:14:27 InnoDB:� I have an EC2 instance set on the x64 amazon linux ami. I am using PHP & Wordpress with W3 total cache & php-apc backed by MySQL to test a blog which can handle a decent number of connections relatively cheaply.
We have a Java EE application (EAR file deployed on JBoss, MySQL, MongoDB) which we would like to deploy on an Amazon EC2 instance. I have several questions regarding deployment best practices. What is the most commonly used Linux AMI which we can rely on for a robust deployment (There are so many Linux variants, and I am not sure which AMI is
How am I able to install MySQL 5.7 in the cloud on Amazon EC2? Most of the Amazon Machine Instances (AMIs) that I see either lack any MySQL server or possess an older version such as MySQL Server 5.5 I want to use the latest and greatest.
30414 20:03:45 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 130414 20:03:45 [Note] Plugin 'FEDERATED' is disabled. 130414 20:03:45 InnoDB: The InnoDB memory heap is disabled 130414 20:03:45 InnoDB: Mutexes and rw_locks use GCC atomic builtins 130414 20:03:45 InnoDB: Compressed tables use zlib 1.2.5 130414 20:03:45
- I have the same problem on my EC2 micro instance. Have tried setting innodb_buffer_pool_size=128M and will see how it goes.
- You may need to add swap space if you are using a micro instance : prowebdev.us/2012/05/amazon-ec2-linux-micro-swap-space.html
- On 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.
- Thanks! This helped me!
- FYI, this worked for me on a Digital Ocean droplet (512 MB). Not that this should surprise anyone, but in case anyone who is unsure, it will probably work on any server with the same issues.
- Thank you for this life saver! Was also running a micro instance with Ubuntu Server.
- For Digital Ocean users, I followed this tutorial and it worked like a charm: digitalocean.com/community/articles/…
- Thanks a lot. Have been pulling my hair out for the past 24 hours, played with all kinds of buffer/cache/query sizes .. You are a life saver !
- MySQL may still crashes so you may need to add swap space to your micro instance.
- Thanks, that makes sense. I think I may also try to limit the number of threads apache can spawn.
- Works great. I have this issue too and by restarting httpd solved the issue.
- Awesome catch, same boat here. I set my apache to use less ram and also created a 512m swap file, but set the vm.swappiness to 10 so that it would only be used in a pinch.
- Restarting nginx and php-fpm also released enough memory to allow mysql to start! Thanks!