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（四核和十六进制）。几周以来，复制工作没有问题。
然后我在本周早些时候注意到I / O线程没有在quad或hex上运行。所以我一遍又一遍地重新启动它们，因为对于至少一个从属设备来说，一切都会正常运行，持续时间长达几分钟。然后I / O线程将再次停止工作。我试图通过phpmyadmin在两台局域网机器上重新配置主机，而phpmyadmin则报告从机已连接到主机。 phpmyadmin给了我现在的选项（那不是昨天）同步奴隶DB和主人的。我运行它并在几秒钟内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机器是12.04桌面。我怀疑我在局域网机器上运行apt-get update / upgrade而忽略了我的猎鹰。所以今天早上我在三台机器上运行它。仍然I / O线程不会运行。
SQL线程始终在运行。有时，主站显示其中一个从站（十六进制）已连接。但它没有保持联系。
就像我说的那样，这个问题已经持续数周没有问题。然后最近停了下来。所以这就是为什么我怀疑在最近的更新/升级中有什么东西打破了这一切。
任何人都知道如何使用它？
由于
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/
另外，根据请求添加来自my.cnf的四行线路，用于复制
# 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。十六进制上的my.cnf与server-id不同，report-host是十六进制，它忽略了访问数据库。并且，与quad一样，绑定地址是本地LAN IP 192.168.1.60。
周末更新 这个问题浮出水面4天，没有回答如何修复曾经工作过的破碎复制。我发布了my.cnf（或至少相关部分），但没有人对修复内容有任何建议。在这个问题已经存在的4天中，2个是周末，所以我没想到太多。
昨晚奇怪的是，我第100次对两个奴隶做了一个完整的奴隶开始，终于开始了。这两个奴隶整夜都没有问题，现在报告他们被主人赶上了（落后0秒）。我在主人身上创建了一个垃圾数据库来测试一切都在运行。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。为此目的，有没有一个好工具？ （奴隶是Ubuntu，我主要用PHP编写代码。）
答案 0 :(得分：0)
I/O thread不再在此服务器上运行，请检查slave的错误日志中是否有可能指示此线程可能已停止的消息。 CHANGE MASTER TO命令中给出的错误位置。通常最简单的解决方法是再次设置从站，就像它是一个新的从站一样。
最后一个错误可以由Last Error Number和Last Error