lvs(DR)+keepalived+mysqld主从
三台机器:director(eth0192.168.0.8, vip eth0:0: 192.168.0.101)
real server1(eth0 rip: 192.168.0.140 vip lo:0:192.168.0.101)
real server2(eth0 rip: 192.168.0.141, vip lo:0:192.168.0.101)
1、自己编写的一键源码安装的lnmp脚本2、安装LVS（DR）yum install ipvsadm
Director 上 vim /usr/local/sbin/lvs_dr.sh //增加
vi /usr/local/sbin/lvs_DR.sh#编辑一个脚本
#!/bin/bash
# directory 服务器开启路由转发功能：
echo 1 > /proc/sys/net/ipv4/ip_forward
ipv='/sbin/ipvsadm'vip=192.168.0.100rs1=192.168.0.7
rs2=192.168.0.5
ifconfig eth0:0 $vip broadcast $vip netmask255.255.255.255 up
route add -host $vip dev eth0:0
$ipv -C
$ipv -A -t $vip:80 -s rr
$ipv -a -t $vip:80 -r $rs1:80 -g -w 1 #-g代表是DR模式
$ipv -a -t $vip:80 -r $rs2:80 -g -w 1
两台rs上：vim/usr/local/sbin/lvs_dr_rs.sh
#! /bin/bash
vip=192.168.0.100
ifconfig lo:0 $vip broadcast $vip netmask255.255.255.255 up
route add -host $vip lo:0
echo "1">/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2">/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1">/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2">/proc/sys/net/ipv4/conf/all/arp_announce
3、 分别配置三台机器的keepalived的配置：（配置完毕启动是先从后主）yum安装keepalived, Keeplived(负载均衡+HA合成的二者为一体)vi /etc/keepalived/keepalived.conf##########MASTER###########
global_defs {
# notification_email {
# xxx@xxx.com
#}
#notification_email_from xxx@xxx.com
#smtp_server mail.qq.com
#smtp_connect_timeout30router_id LVS1} #vrrp_script chk_http_port {
# script "/etc/keepalived/nginx_check.sh"
# interval 2
# weight 2
vrrp_sync_group VS_group { group {
VS_1
}
}
vrrp_instance VS_1 {
state MASTER #备用服务器上为 BACKUP，主是MASTER
interface eth0
lvs_sync_daemon_interface eth0
virtual_router_id60
priority 150 #备用服务器上为100,主是150
advert_int 1 authentication { auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.101
}
}
virtual_server 192.168.0.101 80 {
delay_loop 6 #(每隔10秒查询realserver状态)
lb_algo rr #(lvs 算法)
lb_kind DR #(Direct Route)
persistence_timeout 20 #(同一IP的连接60秒内被分配到同一台realserver)
protocol TCP #(用TCP协议检查realserver状态)
real_server 192.168.0.140 80 {
weight 100 #(权重)
TCP_CHECK {
connect_timeout 10 #(10秒无响应超时)
nb_get_retry 3
delay_before_retry 3
connect_port 80
}}
real_server192.168.0.141 80 { weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
至此，lvs(DR)+keepalived已完成
4、添加防火墙规则后并保存：
iptables -I INPUT -p tcp -m state --state NEW -m tcp --dport 25 -j ACCEPTiptables -I INPUT -p tcp -m state --state NEW -m tcp --dport 80 -jACCEPT #允许80端口对外提供服务iptables -I INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPTiptables -I INPUT -p tcp -m state --state NEW -m tcp --dport 10050 -jACCEPTiptables -A INPUT -d 192.168.2.0/24 -j ACCEPTiptables -A INPUT -p vrrp -j ACCEPT #LVS DR模式。当用户请求LVS-DR的VIP时，只有DR响应客户端的ARP广播包，允许vrrp虚拟路由器冗余协议iptables -A INPUT -p icmp -j ACCEPTiptables -A INPUT -jREJECT --reject-with icmp-host-prohibited iptables -A FORWARD -j REJECT --reject-withicmp-host-prohibited
service iptables save
5、mysql主从配置
理论:主（A）的数据库数据有变化记录一个bin_log，再推给从（B），B数据库的bin_log会记录去更改自己数据库（数据同步）
（1）打开主的mysql配置（my.cnf）添加或打开注释如下配置:
log-bin=mysql-bin #打开这两个注释，log-bin的值可以自定义serverid = 1binlog-do-db=db1 #只针对指定数据库做主从#binlog-ignore-db=mysql #打开注释是不去同步指定的库（黑名单）#log-slave-updates = true #是否继续传递下去为“是”，这个是用于主主，若是多个主的server id
(2)从的my.cnf将原来的配置改为以下： #（用于多实例）
port = 3307
socket =/tmp/mysql_slave.sock
datadir =/data/mysql_slave
server id=1 改成server id =2replicate-do-db=db1 #只针对指定数据库做主从#replicate-ignore-db=mysql #不去同步指定的库（黑名单）(2)<1>cp /etc/init.d/mysqld/etc/init.d/mysqldslave
<2>vim /etc/init.d/mysqldslave将原来的配置改为以下：
找到第一个basedir:
basedir=/usr/local/mysql_slave
datadir=/data/mysql_slave
conf=$basedir/my.cnf
PS:上面mysql的从是用于多实例
（2）从的mysql配置：
server id =2 #server id的变更
replicate-do-db=db1 #只针对指定数据库做主从#replicate-ignore-db=mysql #不去同步指定的库（黑名单）
6、测试能否进入数据库（前提在/etc/profile.d/path.sh里加入PATH=$PATH:/usr/local/mysql/bin后source /etc/profile.d/path.sh; 通过sock登录：mysql -S sock所在位置
(想添加多一个mysql,按照slave的做法即可)
7、做主从前的最后一个主要配置（主从数据库库信息一致）：
mysqldump-S/tmp/mysql.sockmysql > 123.sql #备份mysql数据库
mysql -S /tmp/myslq.sock db1 < 123.sql #将mysql数据库里的东西导入db1数据库
8、进入主的mysql:
mysql>grant replication slave on *.* to ‘repl’@’127.0.0.1’ identifiedby ‘123456’; #针对本地做主从，只赋予replication权限
mysql>grant replication slave on *.* to 'repl'@'从ip’ identifiedby ‘密码’;
mysql> flush privileges;
mysql> flush tables with read lock; #对表的读锁死（read lock）的作用是让show master status的file和position不变
mysql> show master status; #查看master数据信息
+------------------+----------+--------------+------------------+
| File | Position| Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000009| 106 | db1 | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
9、在从的将主传过来的123.sql导入本地数据库
主的操作：scp 123.sql从ip:123.sql
# mysql -S /tmp/mysql_slave.sock -e "createdatabase db1" #在从上新建db1数据库
# mysql -S /tmp/mysql_slave.sock db1 < 123.sql #导入备份的sql去从的db1,实现主从相同
mysql> slave stop; #先停掉从的
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql>change master tomaster_host='主ip',master_port=3306,master_user='repl',master_password='',master_log_file='mysql-bin.000009',master_log_pos=106; #这一步很重要，核心命令mysql>flush privileges;mysql>slave start;mysql> show slave status\G; #查看从库的配置，是否成功看Slave_IO_Running和Slave_SQL_Running是否为 Yes
至此，没有出现任何错误，mysql主从已基本完成
以下是mysql主从过程中出现的一些错误或解决方法：
mysql> show slave status\G;
*************************** 1. row***************************
Slave_IO_State: Connecting tomaster
Master_Host: 192.168.0.140
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000048
Read_Master_Log_Pos: 106
Relay_Log_File:user14-relay-bin.000003
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin.000048
Slave_IO_Running: No
Slave_SQL_Running: Yes
Replicate_Do_DB: test
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 106
Relay_Log_Space: 106
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 2013
Last_IO_Error: error connectingto master 'repl@192.168.0.140:3306' - retry-time: 60retries: 86400
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)
ERROR:
No query specified
查看mysql的slave错误日志
# tail -f/data/mysql/user14.err
160227 21:58:18 Slave I/O threadexiting, read up to log 'mysql-bin.000048', position 106
160227 21:58:18 Error reading relaylog event: slave SQL thread was killed
160227 22:01:11 'CHANGE MASTER TOexecuted'. Previous state master_host='192.168.0.140', master_port='3306',master_log_file='mysql-bin.000048', master_log_pos='106'. New statemaster_host='192.168.0.140', master_port='3306',master_log_file='mysql-bin.000048', master_log_pos='106'.
160227 22:01:33 Slave SQL threadinitialized, starting replication in log 'mysql-bin.000048' at position 106,relay log './user14-relay-bin.000001' position: 4
160227 22:01:33 Slave I/O: errorconnecting to master 'repl@192.168.0.140:3306' - retry-time: 60retries: 86400, Error_code: 2013
160227 22:01:41 Slave I/O threadkilled while connecting to master
160227 22:01:41 Slave I/O threadexiting, read up to log 'mysql-bin.000048', position 106
160227 22:01:41 Error reading relaylog event: slave SQL thread was killed
160227 22:01:47 Slave SQL threadinitialized, starting replication in log 'mysql-bin.000048' at position 106,relay log './user14-relay-bin.000001' position: 4
160227 22:01:47 Slave I/O: errorconnecting to master 'repl@192.168.0.140:3306' - retry-time: 60retries: 86400, Error_code: 2013
Last_IO_Errno: 1593 Last_IO_Error: Fatal error: Theslave I/O thread stops because master and slave have equal MySQL server ids;these ids must be different for replication to work (or the--replicate-same-server-id option must be used on slave but this does notalways make sense; please check the manual before using it).
配置完Error_code: 2013从没重启mysql服务，Last_IO_Errno: 1593是与主的id号冲突
# mysqldump -S/tmp/mysql.sock -p123456mysql >aaa.sql
-- Warning: Skipping the data of tablemysql.event. Specify the --events option explicitly.
mysqldump-uroot -pxxxxx --events --ignore-table=mysql.events需要备份库 > 自定义备份库名字
ERROR 1201 (HY000): Could not initializemaster info structure; more error messages can be found in the MySQL error log
reset slave后再重新授权
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