所以一个月前，我设置了从我的一个 Web 服务器到 m 个本地 LAN 服务器的复制。我有 2 个本地 LAN 服务器，它们是主 Web 服务器（falcon）的从属服务器（quad 和 hex）。数周以来，复制工作没有问题。
然后我在本周早些时候注意到 I/O 线程既没有运行在 quad 也没有运行在 hex 上。所以我一遍又一遍地重新启动它们，因为每隔一段时间，对于至少一个从属服务器来说，看起来一切都会正常运行长达几分钟。然后 I/O 线程将再次停止工作。我试图通过 phpmyadmin 重新配置两台 LAN 机器上的主服务器，并且 phpmyadmin 报告从服务器现在连接到主服务器。phpmyadmin 现在（不是昨天）为我提供了将从属数据库与主数据库同步的选项。我运行它，几秒钟后页面停止加载，但没有给出响应（错误或其他）。
所有涉及的机器都在 Ubuntu 12.04 上运行 LAMP 堆栈。Web 服务器是 12.04 服务器，而 LAN 机器都是 12.04 桌面。我怀疑我在 LAN 机器上运行了 apt-get update/upgrade，而忽略了在我的猎鹰上这样做。所以今天早上我在所有三台机器上运行了它。I/O 线程仍然不会运行。
SQL 线程始终在运行。有时，主站会显示其中一个从站（十六进制）已连接。但它不会保持连接。
就像我说的那样，这工作了数周而没有问题。然后最近停止了。所以这就是为什么我怀疑最近的更新/升级中的某些东西破坏了这一切。
有谁知道如何修复这个？
谢谢
根据请求添加 - 来自 falcon 的 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 = xxxx
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 = xxxx
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 = xxx.xxx.xxx.xxx
#
# * 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 = 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
#log_slow_queries = /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
# Replication per phpmyadmin - falcon is the MASTER
server-id=8503668
log-bin=mysql-bin
log-error=mysql-bin.err
#
# * 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!
#
# 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/
此外，根据请求添加，quad 上 my.cnf 中的行将其设置为复制
# Replication per phpmyadmin
server-id=1369932901
report-host=quad
replicate-ignore-db=visits
my.cnf 的其余部分是默认的，除了绑定地址是 quad 的 LAN IP 192.168.1.70。十六进制的 my.cnf 与服务器 ID 不同的方式相同，报告主机是十六进制，它忽略访问数据库。而且，与 quad 一样，绑定地址是本地 LAN IP 192.168.1.60。
周末更新： 这个问题漂浮了 4 天，没有关于如何修复曾经有效的损坏复制的答案。我已经发布了 my.cnf （或者至少是它的相关部分），但没有人对修复什么有任何建议。在这 4 天中，这个问题一直存在，其中 2 天是周末，所以我没有期待太多。
奇怪的是，昨晚我第 100 次对两个奴隶进行了完整的奴隶启动，最终成功了。两个奴隶都跑了一夜没有问题，现在报告他们追上了主人（落后 0 秒）。我在主服务器上创建了一个垃圾数据库，以测试一切是否正常工作。它几乎立即出现在两个奴隶身上。
我仍然不知道为什么它首先停止工作。有人建议需要经常监控 MySQL 复制。有没有为此目的的好工具？（奴隶是 Ubuntu，我主要用 PHP 编写代码。）