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解决小内存机器 MySQL 总是 OOM 的问题

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有一台 512M 内存的小机器总是报数据库错误,查看了下日志是 OOM 了


一 Add swap file to cloud instance


  1. Run dd if=/dev/zero of=/swapfile bs=1M count=1024
  2. Run mkswap /swapfile
  3. Run swapon /swapfile
  4. Add this line /swapfile swap swap defaults 0 0 to /etc/fstab


Some useful command related to SWAP space:

$ swapon -s
$ free -k
$ swapoff -a
$ swapon  -a

二 limit mysql buffersize

innodb_buffer_pool_size = 8M

三 limit apache memory cosumption,editing /etc/apache2/mods-enabled/mpm_prefork.conf

<IfModule mpm_prefork_module>
    StartServers        3
    MinSpareServers     3
    MaxSpareServers     5
    MaxRequestWorkers   25
    MaxConnectionsPerChild  0

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