我的WordPress网站经常出现错误Error establishing a database connection。
以前，我使用sudo chmod 755 /var/lib/mysql和sudo /etc/init.d/mysql restart来修复它。然而，这一次，他们不能再工作了; sudo /etc/init.d/mysql已退回
stop: Unknown instance:
start: Job failed to start
mysqld --verbose返回了
180120 3:24:48 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
180120 3:24:48 [Warning] Can't create test file /var/lib/mysql/chengtie.lower-test
180120 3:24:48 [Note] mysqld (mysqld 5.5.58-0ubuntu0.14.04.1) starting as process 20724 ...
180120 3:24:48 [Warning] Can't create test file /var/lib/mysql/chengtie.lower-test
180120 3:24:48 [Warning] Can't create test file /var/lib/mysql/chengtie.lower-test
180120 3:24:48 [Warning] One can only use the --user switch if running as root
180120 3:24:48 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
180120 3:24:48 [Note] Plugin 'FEDERATED' is disabled.
mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
180120 3:24:48 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
180120 3:24:48 InnoDB: The InnoDB memory heap is disabled
180120 3:24:48 InnoDB: Mutexes and rw_locks use GCC atomic builtins
180120 3:24:48 InnoDB: Compressed tables use zlib 1.2.8
180120 3:24:48 InnoDB: Using Linux native AIO
180120 3:24:48 InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137363456 bytes) failed; errno 12
180120 3:24:48 InnoDB: Completed initialization of buffer pool
180120 3:24:48 InnoDB: Fatal error: cannot allocate memory for the buffer pool
180120 3:24:48 [ERROR] Plugin 'InnoDB' init function returned error.
180120 3:24:48 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
180120 3:24:48 [ERROR] Unknown/unsupported storage engine: InnoDB
180120 3:24:48 [ERROR] Aborting
180120 3:24:48 [Note] mysqld: Shutdown complete
有谁知道如何恢复我的网站？
答案 0 :(得分：1)
您的Droplet没有足够的可用内存来启动MySQL。查看错误InnoDB: mmap(137363456 bytes) failed; errno 12 - MySQL在尝试分配~130MB内存时失败
运行free -m以检查应用程序可用的内存量。
您可以通过两种方式解决此问题：