我有一个运行LAMP堆栈的Debian服务器。 今天下午没有理由，我的MySQL服务器崩溃，我似乎无法重新启动它。
当我尝试使用命令service mysql start启动它时，没有输出，也没有运行mysql实例。 错误日志也没有logging任何东西。
当我尝试在控制台中用mysqld命令启动一个新实例时，我只是得到以下消息：
171113 18:44:52 [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. 171113 18:44:52 [Note] mysqld (mysqld 5.5.55-0+deb7u1) starting as process 6279 ...
但是使用top命令检查正在运行的进程列表显示没有运行mysql实例。
当检查/var/log/mysql/error.log时，我得到以下信息：
171113 15:02:08 [Note] Plugin 'FEDERATED' is disabled. 171113 15:02:08 InnoDB: The InnoDB memory heap is disabled 171113 15:02:08 InnoDB: Mutexes and rw_locks use GCC atomic builtins 171113 15:02:08 InnoDB: Compressed tables use zlib 1.2.7 171113 15:02:08 InnoDB: Using Linux native AIO 171113 15:02:08 InnoDB: Initializing buffer pool, size = 128.0M 171113 15:02:08 InnoDB: Completed initialization of buffer pool 171113 15:02:08 InnoDB: highest supported file format is Barracuda. InnoDB: Log scan progressed past the checkpoint lsn 372845412514 171113 15:02:08 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... InnoDB: Doing recovery: scanned up to log sequence number 372846067858 171113 15:02:08 InnoDB: Starting an apply batch of log records to the database... InnoDB: Progress in percents: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 InnoDB: Apply batch completed 171113 15:02:09 InnoDB: Waiting for the background threads to start 171113 15:02:10 InnoDB: 5.5.55 started; log sequence number 372846067858 171113 15:02:10 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306 171113 15:02:10 [Note] - '127.0.0.1' resolves to '127.0.0.1'; 171113 15:02:10 [Note] Server socket created on IP: '127.0.0.1'. 171113 15:02:10 [ERROR] Can't start server : Bind on unix socket: No such file or directory 171113 15:02:10 [ERROR] Do you already have another mysqld server running on socket: /var/run/mysqld/mysqld.sock ? 171113 15:02:10 [ERROR] Aborting 171113 15:02:10 InnoDB: Starting shutdown... 171113 15:02:10 InnoDB: Shutdown completed; log sequence number 372846067942 171113 15:02:10 [Note] mysqld: Shutdown complete 171113 15:05:25 [Note] Plugin 'FEDERATED' is disabled. 171113 15:05:25 InnoDB: The InnoDB memory heap is disabled 171113 15:05:25 InnoDB: Mutexes and rw_locks use GCC atomic builtins 171113 15:05:25 InnoDB: Compressed tables use zlib 1.2.7 171113 15:05:25 InnoDB: Using Linux native AIO 171113 15:05:25 InnoDB: Initializing buffer pool, size = 128.0M 171113 15:05:25 InnoDB: Completed initialization of buffer pool 171113 15:05:25 InnoDB: highest supported file format is Barracuda. 171113 15:05:25 InnoDB: Waiting for the background threads to start 171113 15:05:26 InnoDB: 5.5.55 started; log sequence number 372846067942 mysqld: Too many arguments (first extra is 'stop'). Use --verbose --help to get a list of available options 171113 15:05:26 [ERROR] Aborting 171113 15:05:26 InnoDB: Starting shutdown... 171113 15:05:27 InnoDB: Shutdown completed; log sequence number 372846067942 171113 15:05:27 [Note] mysqld: Shutdown complete 171113 15:09:15 [Note] Plugin 'FEDERATED' is disabled. 171113 15:09:15 InnoDB: The InnoDB memory heap is disabled 171113 15:09:15 InnoDB: Mutexes and rw_locks use GCC atomic builtins 171113 15:09:15 InnoDB: Compressed tables use zlib 1.2.7 171113 15:09:15 InnoDB: Using Linux native AIO 171113 15:09:15 InnoDB: Initializing buffer pool, size = 128.0M 171113 15:09:15 InnoDB: Completed initialization of buffer pool 171113 15:09:15 InnoDB: highest supported file format is Barracuda. 171113 15:09:15 InnoDB: Waiting for the background threads to start 171113 15:09:16 InnoDB: 5.5.55 started; log sequence number 372846067942 171113 15:09:16 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306 171113 15:09:16 [Note] - '127.0.0.1' resolves to '127.0.0.1'; 171113 15:09:16 [Note] Server socket created on IP: '127.0.0.1'. 171113 15:09:16 [ERROR] Can't start server : Bind on unix socket: No such file or directory 171113 15:09:16 [ERROR] Do you already have another mysqld server running on socket: /var/run/mysqld/mysqld.sock ? 171113 15:09:16 [ERROR] Aborting 171113 15:09:16 InnoDB: Starting shutdown... 171113 15:09:17 InnoDB: Shutdown completed; log sequence number 372846067942 171113 15:09:17 [Note] mysqld: Shutdown complete 171113 15:10:04 [Note] Plugin 'FEDERATED' is disabled. 171113 15:10:04 InnoDB: The InnoDB memory heap is disabled 171113 15:10:04 InnoDB: Mutexes and rw_locks use GCC atomic builtins 171113 15:10:04 InnoDB: Compressed tables use zlib 1.2.7 171113 15:10:04 InnoDB: Using Linux native AIO 171113 15:10:04 InnoDB: Initializing buffer pool, size = 128.0M 171113 15:10:04 InnoDB: Completed initialization of buffer pool 171113 15:10:04 InnoDB: highest supported file format is Barracuda. 171113 15:10:05 InnoDB: Waiting for the background threads to start 171113 15:10:06 InnoDB: 5.5.55 started; log sequence number 372846067942 171113 15:10:06 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306 171113 15:10:06 [Note] - '127.0.0.1' resolves to '127.0.0.1'; 171113 15:10:06 [Note] Server socket created on IP: '127.0.0.1'. 171113 15:10:06 [ERROR] Can't start server : Bind on unix socket: No such file or directory 171113 15:10:06 [ERROR] Do you already have another mysqld server running on socket: /var/run/mysqld/mysqld.sock ? 171113 15:10:06 [ERROR] Aborting 171113 15:10:06 InnoDB: Starting shutdown... 171113 15:10:06 InnoDB: Shutdown completed; log sequence number 372846067942 171113 15:10:06 [Note] mysqld: Shutdown complete 171113 15:10:16 [Note] Plugin 'FEDERATED' is disabled. 171113 15:10:16 InnoDB: The InnoDB memory heap is disabled 171113 15:10:16 InnoDB: Mutexes and rw_locks use GCC atomic builtins 171113 15:10:16 InnoDB: Compressed tables use zlib 1.2.7 171113 15:10:16 InnoDB: Using Linux native AIO 171113 15:10:16 InnoDB: Initializing buffer pool, size = 128.0M 171113 15:10:16 InnoDB: Completed initialization of buffer pool 171113 15:10:16 InnoDB: highest supported file format is Barracuda. 171113 15:10:16 InnoDB: Waiting for the background threads to start 171113 15:10:17 InnoDB: 5.5.55 started; log sequence number 372846067942 mysqld: Too many arguments (first extra is 'stop'). Use --verbose --help to get a list of available options 171113 15:10:17 [ERROR] Aborting 171113 15:10:17 InnoDB: Starting shutdown... 171113 15:10:17 InnoDB: Shutdown completed; log sequence number 372846067942 171113 15:10:17 [Note] mysqld: Shutdown complete 171113 18:44:53 [Note] Plugin 'FEDERATED' is disabled. 171113 18:44:53 InnoDB: The InnoDB memory heap is disabled 171113 18:44:53 InnoDB: Mutexes and rw_locks use GCC atomic builtins 171113 18:44:53 InnoDB: Compressed tables use zlib 1.2.7 171113 18:44:53 InnoDB: Using Linux native AIO 171113 18:44:53 InnoDB: Initializing buffer pool, size = 128.0M 171113 18:44:53 InnoDB: Completed initialization of buffer pool 171113 18:44:53 InnoDB: highest supported file format is Barracuda. 171113 18:44:53 InnoDB: Waiting for the background threads to start 171113 18:44:54 InnoDB: 5.5.55 started; log sequence number 372846067942 mysqld: Too many arguments (first extra is 'start'). Use --verbose --help to get a list of available options 171113 18:44:54 [ERROR] Aborting 171113 18:44:54 InnoDB: Starting shutdown... 171113 18:44:55 InnoDB: Shutdown completed; log sequence number 372846067942 171113 18:44:55 [Note] mysqld: Shutdown complete
所以至lessmysqld命令显示错误…但我没有智慧。
service mysql restart什么也不做 mysqld提供一个控制台输出，但立即停止并抛出一个错误（上面显示的错误日志） 任何人都可以指出我正确的方向来弄清楚如何：
我一直在玩，现在find了一个简单的方法来让它运行。 在/var/run/mysqld创buildmysqld文件夹之后，命令mysqld工作。 但是，这感觉非常糟糕，我不得不在每个服务器重启时重新创build/ var / run中的mysqld文件夹。
在/ var / run中创buildmysqld文件夹之后，得到以下输出：root @ id93401-vps002：〜＃mysqld
171113 20:31:30 [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. 171113 20:31:30 [Note] mysqld (mysqld 5.5.55-0+deb7u1) starting as process 2048 ...
这至less可以保持现在的网站漂浮。 我目前保持与nohup mysqld MySQL。
/etc/mysql/my.cnf # GNU nano 2.2.6 File: my.cnf # # The MySQL database server configuration file. # # You can copy this to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" to set user-specific options. # # One can use all long options that the program supports. # Run program with --help to get a list of available options and with # --print-defaults to see which it would actually understand and use. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # This will be passed to all mysql clients # It has been reported that passwords should be enclosed with ticks/quotes # escpecially if they contain "#" chars... # Remember to edit /etc/mysql/debian.cnf when changing the socket location. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram # This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock GNU nano 2.2.6 File: my.cnf # # The MySQL database server configuration file. # # You can copy this to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" to set user-specific options. GNU nano 2.2.6 File: my.cnf # # The MySQL database server configuration file. # # You can copy this to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" to set user-specific options. # # One can use all long options that the program supports. # Run program with --help to get a list of available options and with # --print-defaults to see which it would actually understand and use. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # This will be passed to all mysql clients # It has been reported that passwords should be enclosed with ticks/quotes # escpecially if they contain "#" chars... # Remember to edit /etc/mysql/debian.cnf when changing the socket location. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram # This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] # # * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 127.0.0.1 # # * Fine Tuning # key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover-options = BACKUP #max_connections = 100 #table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 16M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 # # Error log - should be very few entries. # log_error = /var/log/mysql/error.log # # Here you can see queries with especially long duration #slow_query_log = 1 #slow_query_log_file = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] #no-auto-rehash # faster start of mysql but no tab completition [isamchk] key_buffer = 16M # # * IMPORTANT: Additional settings that can override those from this file! # The files must end with '.cnf', otherwise they'll be ignored. # !includedir /etc/mysql/conf.d/
发布的第一条线索是要求您在my.cnf中将key_buffer = 16M更改为key_buffer_size = 16M。