mysql5.6主从搭建以及不同步问题详解

目录

• 一、mysql主从复制原理
• 二、mysql编译安装
• 三、主从配置
• 四、主从不同步

系统：centos6.6

主：192.168.142.129 mysql-5.6.30.tar.gz

从：192.168.142.130 192.168.142.131 mysql-5.6.30.tar.gz

一、mysql主从复制原理

(1) master将改变记录到二进制日志(binary log)中；

(2) slave将master的binary log events拷贝到它的中继日志(relay log)；slave的I/O线程从master的二进制日志中读取事件并写入中继日志；

(3) slave重做中继日志中的事件，将改变反映它自己的数据。slave的SQL线程从中继日志读取事件，并在本地重放其中的事件，使其与master中的数据一致。

mysql主从实现的步骤：

1、使用mysqldump 命令备份数据库，

2、查看主节点二进制的位置点

3、创建备份用户，并授权(replication client.replication slave)

4、从服务器修改server-id，必须与主mysql的server-id不同，开启中继日子，关闭二进制日子

5、从数据库，倒入数据，并使用授权用户，连接主mysql

6、start slave

SQL语言共分为以下几大类：查询语言DQL，控制语言DCL，操纵语言DML，定义语言DDL。事务控制TCL.

DQL（Data QUERY Languages）语句：即数据库定义语句，用来查询SELECT子句，FROM子句，WHERE子句组成的查询块，比如：select–from–where–grouop by–having–order by–limit

DDL（Data Definition Languages）语句：即数据库定义语句，用来创建数据库中的表、索引、视图、存储过程、触发器等，常用的语句关键字有CREATE,ALTER,DROP,TRUNCATE,COMMENT,RENAME。增删改表的结构

DML（Data Manipulation Language）语句：即数据操纵语句，用来查询、添加、更新、删除等，常用的语句关键字有：SELECT,INSERT,UPDATE,DELETE,MERGE,CALL,EXPLAIN PLAN,LOCK TABLE,包括通用性的增删改查。增删改表的数据

DCL（Data Control Language）语句：即数据控制语句，用于授权/撤销数据库及其字段的权限（DCL is short name of Data Control Language which includes commands such as GRANT and mostly concerned with rights, permissions and other controls of the database system.）。常用的语句关键字有：GRANT,REVOKE。

TCL（Transaction Control Language）语句：事务控制语句，用于控制事务，常用的语句关键字有：COMMIT,ROLLBACK,SAVEPOINT,SET TRANSACTION。

二、mysql编译安装

#!/bin/bash
yum -y install make gcc gcc-c++ openssl openssl-devel pcre-devel gd cmake ncurses ncurses-devel
id -u mysql
if [ `echo $?` -ne 0 ];
then
groupadd mysql
useradd -M -g mysql -s /sbin/nologin mysql
fi

if [ ! -d  "/usr/local/mysql" ];
then
    mkdir -p /usr/local/mysql
fi
mkdir -p /data/mysql
chown -R mysql:mysql /data/mysql
cd /home/soft/                          #软件存放目录
tar zxvf mysql-5.6.30.tar.gz
cd mysql-5.6.30

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DSYSCONFDIR=/etc -DMYSQL_DATADIR=/data/mysql/data -DINSTALL_MANDIR=/usr/share/man -DMYSQL_TCP_PORT=3306 -DMYSQL_UNIX_ADDR=/tmp/mysql.sock -DDEFAULT_CHARSET=utf8 -DEXTRA_CHARSETS=all -DDEFAULT_COLLATION=utf8_general_ci -DWITH_READLINE=1 -DWITH_SSL=system -DWITH_EMBEDDED_SERVER=1 -DENABLED_LOCAL_INFILE=1 -DWITH_INNOBASE_STORAGE_ENGINE=1
make && make install

chown -R mysql:mysql .
chmod +x scripts/mysql_install_db

./scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql
cp ./support-files/mysql.server  /etc/rc.d/init.d/mysqld
chmod 755 /etc/init.d/mysqld
chkconfig mysqld on

cat> /etc/rc.d/init.d/mysqld <<'EOF'                #mysql启动脚本
#!/bin/sh
# Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
# This file is public domain and comes with NO WARRANTY of any kind

# MySQL daemon start/stop script.

# Usually this is put in /etc/init.d (at least on machines SYSV R4 based
# systems) and linked to /etc/rc3.d/S99mysql and /etc/rc0.d/K01mysql.
# When this is done the mysql server will be started when the machine is
# started and shut down when the systems goes down.

# Comments to support chkconfig on RedHat Linux
# chkconfig: 2345 64 36
# description: A very fast and reliable SQL database engine.

# Comments to support LSB init script conventions
### BEGIN INIT INFO
# Provides: mysql
# Required-Start: $local_fs $network $remote_fs
# Should-Start: ypbind nscd ldap ntpd xntpd
# Required-Stop: $local_fs $network $remote_fs
# Default-Start:  2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: start and stop MySQL
# Description: MySQL is a very fast and reliable SQL database engine.
### END INIT INFO

# If you install MySQL on some other places than /usr/local/mysql, then you
# have to do one of the following things for this script to work:
#
# - Run this script from within the MySQL installation directory
# - Create a /etc/my.cnf file with the following information:
#   [mysqld]
#   basedir=<path-to-mysql-installation-directory>
# - Add the above to any other configuration file (for example ~/.my.ini)
#   and copy my_print_defaults to /usr/bin
# - Add the path to the mysql-installation-directory to the basedir variable
#   below.
#
# If you want to affect other MySQL variables, you should make your changes
# in the /etc/my.cnf, ~/.my.cnf or other MySQL configuration files.

# If you change base dir, you must also change datadir. These may get
# overwritten by settings in the MySQL configuration files.
basedir=/usr/local/mysql
datadir=/data/mysql

# Default value, in seconds, afterwhich the script should timeout waiting
# for server start.
# Value here is overriden by value in my.cnf.
# 0 means don't wait at all
# Negative numbers mean to wait indefinitely
service_startup_timeout=900

# Lock directory for RedHat / SuSE.
lockdir='/var/lock/subsys'
lock_file_path="$lockdir/mysql"

# The following variables are only set for letting mysql.server find things.

# Set some defaults
mysqld_pid_file_path=
if test -z "$basedir"
then
  basedir=/usr/local/mysql
  bindir=/usr/local/mysql/bin
  if test -z "$datadir"
  then
    datadir=/data/mysql/data
  fi
  sbindir=/usr/local/mysql/bin
  libexecdir=/usr/local/mysql/bin
else
 bindir="$basedir/bin"
  if test -z "$datadir"
  then
    datadir="$basedir/data"
  fi
  sbindir="$basedir/sbin"
  libexecdir="$basedir/libexec"
fi

# datadir_set is used to determine if datadir was set (and so should be
# *not* set inside of the --basedir= handler.)
datadir_set=
# Use LSB init script functions for printing messages, if possible
#
lsb_functions="/lib/lsb/init-functions"
if test -f $lsb_functions ; then
  . $lsb_functions
else
  log_success_msg()
  {
    echo " SUCCESS! $@"
  }
  log_failure_msg()
  {
    echo " ERROR! $@"
  }
fi

PATH="/sbin:/usr/sbin:/bin:/usr/bin:$basedir/bin"
export PATH
mode=$1    # start or stop

[ $# -ge 1 ] && shift

other_args="$*"   # uncommon, but needed when called from an RPM upgrade action
           # Expected: "--skip-networking --skip-grant-tables"
           # They are not checked here, intentionally, as it is the resposibility
           # of the "spec" file author to give correct arguments only.

case `echo "testing\c"`,`echo -n testing` in
    *c*,-n*) echo_n=   echo_c=     ;;
    *c*,*)   echo_n=-n echo_c=     ;;
    *)       echo_n=   echo_c='\c' ;;
esac

parse_server_arguments() {
  for arg do
    case "$arg" in
      --basedir=*)  basedir=`echo "$arg" | sed -e 's/^[^=]*=//'`
                    bindir="$basedir/bin"
                    if test -z "$datadir_set"; then
                      datadir="$basedir/data"
                    fi
                    sbindir="$basedir/sbin"
                    libexecdir="$basedir/libexec"
        ;;
      --datadir=*)  datadir=`echo "$arg" | sed -e 's/^[^=]*=//'`
                    datadir_set=1
        ;;
      --pid-file=*) mysqld_pid_file_path=`echo "$arg" | sed -e 's/^[^=]*=//'` ;;
      --service-startup-timeout=*) service_startup_timeout=`echo "$arg" | sed -e 's/^[^=]*=//'` ;;
    esac
  done
}

wait_for_pid () {
  verb="$1"           # created | removed
  pid="$2"            # process ID of the program operating on the pid-file
pid_file_path="$3" # path to the PID file.

  i=0
  avoid_race_condition="by checking again"

  while test $i -ne $service_startup_timeout ; do

    case "$verb" in
      'created')
        # wait for a PID-file to pop into existence.
        test -s "$pid_file_path" && i='' && break
        ;;
      'removed')
        # wait for this PID-file to disappear
        test ! -s "$pid_file_path" && i='' && break
        ;;
      *)
        echo "wait_for_pid () usage: wait_for_pid created|removed pid pid_file_path"
        exit 1
        ;;
    esac

    # if server isn't running, then pid-file will never be updated
    if test -n "$pid"; then
 if kill -0 "$pid" 2>/dev/null; then
        :  # the server still runs
      else
        # The server may have exited between the last pid-file check and now.
        if test -n "$avoid_race_condition"; then
          avoid_race_condition=""
          continue  # Check again.

        fi

        # there's nothing that will affect the file.
        log_failure_msg "The server quit without updating PID file ($pid_file_path)."
        return 1  # not waiting any more.
      fi
    fi

    echo $echo_n ".$echo_c"
    i=`expr $i + 1`
    sleep 1

  done

  if test -z "$i" ; then
    log_success_msg
    return 0
  else
    log_failure_msg
    return 1
  fi
}

# Get arguments from the my.cnf file,
# the only group, which is read from now on is [mysqld]
if test -x ./bin/my_print_defaults
then
  print_defaults="./bin/my_print_defaults"
elif test -x $bindir/my_print_defaults
then
  print_defaults="$bindir/my_print_defaults"
elif test -x $bindir/mysql_print_defaults
then
  print_defaults="$bindir/mysql_print_defaults"
else
  # Try to find basedir in /etc/my.cnf
  conf=/etc/my.cnf
  print_defaults=
  if test -r $conf
  then
    subpat='^[^=]*basedir[^=]*=\(.*\)$'
    dirs=`sed -e "/$subpat/!d" -e 's//\1/' $conf`
    for d in $dirs
    do
      d=`echo $d | sed -e 's/[  ]//g'`
      if test -x "$d/bin/my_print_defaults"
      then
        print_defaults="$d/bin/my_print_defaults"
        break
      fi
      if test -x "$d/bin/mysql_print_defaults"
      then
      print_defaults="$d/bin/mysql_print_defaults"
        break
      fi
    done
  fi
  # Hope it's in the PATH ... but I doubt it
  test -z "$print_defaults" && print_defaults="my_print_defaults"
fi

#
# Read defaults file from 'basedir'.   If there is no defaults file there
# check if it's in the old (depricated) place (datadir) and read it from there
#

extra_args=""
if test -r "$basedir/my.cnf"
then
  extra_args="-e $basedir/my.cnf"
else
  if test -r "$datadir/my.cnf"
  then
    extra_args="-e $datadir/my.cnf"
  fi
fi

parse_server_arguments `$print_defaults $extra_args mysqld server mysql_server mysql.server`

#
# Set pid file if not given
#
if test -z "$mysqld_pid_file_path"
then
  mysqld_pid_file_path=$datadir/`hostname`.pid
else
  case "$mysqld_pid_file_path" in
    /* ) ;;
    * )  mysqld_pid_file_path="$datadir/$mysqld_pid_file_path" ;;
  esac
fi

case "$mode" in
  'start')
    # Start daemon

    # Safeguard (relative paths, core dumps..)
    cd $basedir

    echo $echo_n "Starting MySQL"
    if test -x $bindir/mysqld_safe
    then
      # Give extra arguments to mysqld with the my.cnf file. This script
      # may be overwritten at next upgrade.
      $bindir/mysqld_safe --datadir="$datadir" --pid-file="$mysqld_pid_file_path" $other_args >/dev/null 2>&1 &
      wait_for_pid created "$!" "$mysqld_pid_file_path"; return_value=$?

      # Make lock for RedHat / SuSE
      if test -w "$lockdir"
      then
        touch "$lock_file_path"
      fi
  exit $return_value
    else
      log_failure_msg "Couldn't find MySQL server ($bindir/mysqld_safe)"
    fi
    ;;

  'stop')
    # Stop daemon. We use a signal here to avoid having to know the
    # root password.

    if test -s "$mysqld_pid_file_path"
    then
      mysqld_pid=`cat "$mysqld_pid_file_path"`

      if (kill -0 $mysqld_pid 2>/dev/null)
      then
        echo $echo_n "Shutting down MySQL"
        kill $mysqld_pid
        # mysqld should remove the pid file when it exits, so wait for it.
        wait_for_pid removed "$mysqld_pid" "$mysqld_pid_file_path"; return_value=$?
      else
        log_failure_msg "MySQL server process #$mysqld_pid is not running!"
        rm "$mysqld_pid_file_path"
      fi

      # Delete lock for RedHat / SuSE
      if test -f "$lock_file_path"
      then
        rm -f "$lock_file_path"
      fi
      exit $return_value
 else
      log_failure_msg "MySQL server PID file could not be found!"
    fi
    ;;

  'restart')
    # Stop the service and regardless of whether it was
    # running or not, start it again.
    if $0 stop  $other_args; then
      $0 start $other_args
    else
      log_failure_msg "Failed to stop running server, so refusing to try to start."
      exit 1
    fi
    ;;

  'reload'|'force-reload')
    if test -s "$mysqld_pid_file_path" ; then
      read mysqld_pid <  "$mysqld_pid_file_path"
      kill -HUP $mysqld_pid && log_success_msg "Reloading service MySQL"
      touch "$mysqld_pid_file_path"
    else
      log_failure_msg "MySQL PID file could not be found!"
      exit 1
    fi
    ;;
  'status')
    # First, check to see if pid file exists
    if test -s "$mysqld_pid_file_path" ; then
      read mysqld_pid < "$mysqld_pid_file_path"
      if kill -0 $mysqld_pid 2>/dev/null ; then
  log_success_msg "MySQL running ($mysqld_pid)"
        exit 0
      else
        log_failure_msg "MySQL is not running, but PID file exists"
        exit 1
      fi
    else
      # Try to find appropriate mysqld process
      mysqld_pid=`pidof $libexecdir/mysqld`
      if test -z $mysqld_pid ; then
        if test -f "$lock_file_path" ; then
          log_failure_msg "MySQL is not running, but lock file ($lock_file_path) exists"
          exit 2
        fi
        log_failure_msg "MySQL is not running"
        exit 3
      else
        log_failure_msg "MySQL is running but PID file could not be found"
        exit 4
      fi
    fi
    ;;
    *)
      # usage
      basename=`basename "$0"`
      echo "Usage: $basename  {start|stop|restart|reload|force-reload|status}  [ MySQL server options ]"
      exit 1
    ;;

esac

exit 0
EOF

cat> /etc/my.cnf <<'EOF'                    #mysql配置文件
[client]
#password       = your_password
port            = 3306
socket          = /tmp/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
port            = 3306
socket          = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 384M
max_allowed_packet = 64M
table_open_cache = 512
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size = 32M
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 8
basedir = /usr/local/mysql
datadir = /data/mysql
max_connections = 5000
long_query_time = 1
slow_query_log = 1
slow_query_log_file = /var/log/mysql/slow.log

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
lower_case_table_names = 1
# Replication Master Server (default)
# binary logging is required for replication
#log-bin=mysql-bin
skip-name-resolve
# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
#server-id      = 1
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin
#
# binary logging format - mixed recommended
#binlog_format=mixed

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /data/mysql/data
#innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend
#innodb_log_group_home_dir = /data/mysql/data
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
innodb_buffer_pool_size = 4096M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to 25 % of buffer pool size
innodb_log_file_size = 512M
#innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 0
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 64M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[myisamchk]
key_buffer_size = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

EOF

ln -s /usr/local/mysql/bin/mysqladmin /usr/bin
ln -s /usr/local/mysql/lib/mysql /usr/lib
ln -s /usr/local/mysql/include/mysql /usr/include/mysql
mkdir /var/lib/mysql
ln -s /tmp/mysql.sock /var/lib/mysql/mysql.sock
echo 'export PATH=$PATH:/usr/local/mysql/bin' >> /etc/profile
sleep 2
source /etc/profile

service mysqld start

sleep 5
cd /usr/local/mysql/bin && mysqladmin -uroot password 'mysql'    #授权root用户的password
source /etc/profile

三、主从配置

1、这里验证主库有数据的情况，然后授权有复制权限的用户

mysql> create database db1;
mysql> use db1
mysql> create table t1(id int, name varchar(12));
mysql> insert into t1 values(1, 'tom'), (2, 'jerry'), (3, 'jack');
mysql> grant replication slave,replication client  on *.* to 'backuser'@'192.168.142.130' identified by 'mysqll';
mysql> grant replication slave,replication client  on *.* to 'backuser'@'192.168.142.131' identified by 'mysql';
mysql> flush privileges;

2、修改各个数据库的配置文件后重启数据库

vi /etc/my.cnf        #主库配置文件
server-id=1
log-bin=mysql-bin
binlog-do-db=db1
binlog-ignore-db=mysql 

vi /etc/my.cnf       #从库配置文件
server-id=2           #从库id不能和主库一样，其他从库往后面排
log-bin=relay-bin
replicate-do-db=db1        #同步db1库
replicate-ignore-db=mysql  #不会同步mysql库
read_only                  #只读

service mysqld restart

3、主库锁表备份，然后文件传给从库

mysql> flush tables with read lock;     #主库锁表防止新的数据写入
mysql> show master status;              #查看主库位置节点

新打开一个终端备份：
mysqldump -u root -p --default-character-set=utf8 --opt -Q -R --skip-lock-tables db1 > /root/db1.sql
scp /root/db1.sql root@192.168.142.130:/root
scp /root/db1.sql root@192.168.142.130:/root

4、从库导入数据，然后change到主库的节点

mysql -u root -p
mysql> create database db1;
mysql> use db1
mysql> source /root/db1.sql
mysql> change master to master_host='192.168.142.129',master_user='backuser',master_password='mysql',master_log_file='mysql-bin.000001',master_log_pos=120;
mysql> start slave;
mysql> show slave status\G

5、主库解锁

mysql> unlock tables;

以上配置对主从不同步，重新配置主从同样适用。

四、主从不同步

1、造成不同步的原因

​网络的延迟主从两台机器的负载不一致max_allowed_packet设置不一致key自增键开始的键值跟自增步长设置不一致引起的主从不一致​mysql异常宕机情况下，如果未设置sync_binlog=1或者innodb_flush_log_at_trx_commit=1很有可能

出现binlog或者relaylog文件出现损坏，导致主从不一致mysql本身的bug引起的主从不同步版本不一致，特别是高版本是主，低版本为从的情况下，主数据库上面支持的功能，从数据库上面不支持该功能

2、解决办法

（1）忽略错误后，继续同步

该方法适用于主从库数据相差不大，或者要求数据可以不完全统一的情况，数据要求不严格的情况

stop slave; set global sql_slave_skip_counter =1; start slave; show slave status\G

（2）重新做主从

参考上面配置主库锁表重新做主从。

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