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从 MySQL 4 升级到 Mysql 5 - 相同的 my.cnf - 大量随机断开连接

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从 MySQL 4 升级到 Mysql 5 - 相同的 my.cnf - 大量随机断开连接

我最近从 MySQL4 迁移到了 MySQL5（我们的一些应用程序需要 MySQL4，但我们最终将其替换掉了）

从那时起，我遇到了很多类似的问题：-

connect() failed: Lost connection to MySQL server at 'reading initial communication packet', system error: 0

是的，这是系统错误 0 — “成功”。

我不知道为什么会发生这种情况 - 但想找出原因

这是我的（已清理的）my.cnf

[client]
port        = 3306
socket      = /var/run/mysqld/mysqld.sock

[mysqld_safe]
socket      = /var/run/mysqld/mysqld.sock
nice        = 0

[mysqld]
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
language    = /usr/share/mysql/english
skip-external-locking

key_buffer      = 1048M
max_allowed_packet  = 16M
thread_stack = 2M
thread_cache_size   = 16384
sort_buffer_size    = 256K
read_buffer_size    = 2M
read_rnd_buffer_size    = 256K
tmp_table_size      = 512M
max_heap_table_size = 512M
query_cache_size    = 512M
thread_concurrency  = 16
set-variable = table_cache=16384
max_connections     = 500

wait_timeout = 3600

innodb_buffer_pool_size = 1024M
innodb_additional_mem_pool_size = 8M
innodb_lock_wait_timeout = 50
innodb_flush_method=O_DIRECT
innodb_log_buffer_size = 8M
innodb_thread_concurrency = 8
innodb_file_per_table=1

query_cache_limit       = 1024M
query_cache_size        = 512M
query_cache_type = 1
server-id       = 9
log_bin         = /var/log/mysql/mysql-bin.log
expire_logs_days    = 10
max_binlog_size         = 100M

expire_logs_days    = 3

skip-bdb

[mysqldump]
quick
quote-names
max_allowed_packet  = 16M

[mysql]
prompt                  = (\u@atlas) [\d]>\\_

[isamchk]
key_buffer      = 16M

!includedir /etc/mysql/conf.d/

编辑我更改了上面的 my.cnf - 我刚刚意识到它是来自旧服务器的！另外 - 这是 5.0，而不是 5.1

答案1

首先，删除这里发布的“skip-bdb”行：Mysql-Server-5.1升级问题

答案2

似乎有一个详细的错误报告这解释了这个错误，并提出了增加参数的可能解决方案connect_timeout。

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