netstat -natp | grep 3306

systemctl stop firewalld systemctl disable firewalld setenforce 0 

hostnamectl set-hostname mysql1 su - hostnamectl set-hostname mysql2 su - hostnamectl set-hostname mysql3 su -

vim /etc/my.cnf [mysqld] server-id = 20 log_bin = master-bin log-slave-updates = true systemctl restart mysqld ln -s /usr/local/mysql/bin/mysql /usr/sbin/ ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin/ 

vim /etc/my.cnf server-id = 30 #server-id = 40 mysql3则为40，三台服务器 server-id 不能一样 log_bin = master-bin relay-log = relay-log-bin relay-log-index = slave-relay-bin.index systemctl restart mysqld ln -s /usr/local/mysql/bin/mysql /usr/sbin/ ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin/ 

mysql -e "grant replication slave on *.* to 'myslave'@'192.168.159.%' identified by '123123';" mysql -e "grant all privileges on *.* to 'mha'@'192.168.159.%' identified by 'manager';" mysql -e "grant all privileges on *.* to 'mha'@'mysql1' identified by 'manager';" mysql -e "grant all privileges on *.* to 'mha'@'mysql2' identified by 'manager';" mysql -e "grant all privileges on *.* to 'mha'@'mysql3' identified by 'manager';" 

mysql -e "show master status;" 例：每个人的二进制文件名或者偏移量都可能不一样，记住自己的

+-------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +-------------------+----------+--------------+------------------+-------------------+ | master-bin.000001 | 1595 | | | | +-------------------+----------+--------------+------------------+-------------------+ 

mysql -e "change master to master_host='192.168.159.130',master_user='myslave',master_password='123123',master_log_file='master-bin.000001',master_log_pos=1595;" mysql -e "start slave;" mysql -e "show slave statusG" | awk '/Running:/{print}' 

[root@mysql2 ~]# mysql -e "start slave;" [root@mysql2 ~]# mysql -e "show slave statusG" | awk '/Running:/{print}' Slave_IO_Running: Connecting Slave_SQL_Running: Yes 

解决方式： 1、进入数据库 [root@mysql2 ~]# mysql -u root -p 2、关闭 mysql> stop slave io_thread -> ; 

mysql -e "set global read_only=1;" 

mysql -e 'create database testz_test;' mysql -e 'show databases;' 

yum install epel-release --nogpgcheck -y 

yum install -y perl-DBD-MySQL  perl-Config-Tiny  perl-Log-Dispatch  perl-Parallel-ForkManager  perl-ExtUtils-CBuilder  perl-ExtUtils-MakeMaker  perl-CPAN 

cd /opt tar zxvf mha4mysql-node-0.57.tar.gz cd mha4mysql-node-0.57 perl Makefile.PL make && make install 

cd /opt tar zxvf mha4mysql-manager-0.57.tar.gz cd mha4mysql-manager-0.57 perl Makefile.PL make && make install 

ssh-keygen -t rsa #一路按回车键 ssh-copy-id 192.168.159.130 ssh-copy-id 192.168.159.14 ssh-copy-id 192.168.159.11 

ssh-keygen -t rsa #一路按回车键 ssh-copy-id 192.168.159.14 ssh-copy-id 192.168.159.11

ssh-keygen -t rsa #一路按回车键 ssh-copy-id 192.168.159.130 ssh-copy-id 192.168.159.11

ssh-keygen -t rsa #一路按回车键 ssh-copy-id 192.168.159.130 ssh-copy-id 192.168.159.14 

cp -rp /opt/mha4mysql-manager-0.57/samples/scripts /usr/local/bin #复制后会有四个执行文件 ll /usr/local/bin/scripts/ 

cp /usr/local/bin/scripts/master_ip_failover /usr/local/bin 

echo '' > /usr/local/bin/master_ip_failover vim /usr/local/bin/master_ip_failover 

#!/usr/bin/env perl use strict; use warnings FATAL => 'all'; use Getopt::Long; my ( $command, $ssh_user, $orig_master_host, $orig_master_ip, $orig_master_port, $new_master_host, $new_master_ip, $new_master_port ); #############################添加内容部分######################################### my $vip = '192.168.159.200'; #指定vip的地址 my $brdc = '192.168.159.255'; #指定vip的广播地址 my $ifdev = 'ens33'; #指定vip绑定的网卡 my $key = '1'; #指定vip绑定的虚拟网卡序列号 my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip"; #代表此变量值为ifconfig ens33:1 192.168.184.200 my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down"; #代表此变量值为ifconfig ens33:1 192.168.184.200 down my $exit_code = 0; #指定退出状态码为0 #my $ssh_start_vip = "/usr/sbin/ip addr add $vip/24 brd $brdc dev $ifdev label $ifdev:$key;/usr/sbin/arping -q -A -c 1 -I $ifdev $vip;iptables -F;"; #my $ssh_stop_vip = "/usr/sbin/ip addr del $vip/24 dev $ifdev label $ifdev:$key"; ################################################################################## GetOptions( 'command=s' => $command, 'ssh_user=s' => $ssh_user, 'orig_master_host=s' => $orig_master_host, 'orig_master_ip=s' => $orig_master_ip, 'orig_master_port=i' => $orig_master_port, 'new_master_host=s' => $new_master_host, 'new_master_ip=s' => $new_master_ip, 'new_master_port=i' => $new_master_port, ); exit &main(); sub main { print "nnIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===nn"; if ( $command eq "stop" || $command eq "stopssh" ) { my $exit_code = 1; eval { print "Disabling the VIP on old master: $orig_master_host n"; &stop_vip(); $exit_code = 0; }; if ($@) { warn "Got Error: $@n"; exit $exit_code; } exit $exit_code; } elsif ( $command eq "start" ) { my $exit_code = 10; eval { print "Enabling the VIP - $vip on the new master - $new_master_host n"; &start_vip(); $exit_code = 0; }; if ($@) { warn $@; exit $exit_code; } exit $exit_code; } elsif ( $command eq "status" ) { print "Checking the Status of the script.. OK n"; exit 0; } else { &usage(); exit 1; } } sub start_vip() { `ssh $ssh_user@$new_master_host " $ssh_start_vip "`; } ## A simple system call that disable the VIP on the old_master sub stop_vip() { `ssh $ssh_user@$orig_master_host " $ssh_stop_vip "`; } sub usage { print "Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=portn"; } 

mkdir /etc/masterha cp /opt/mha4mysql-manager-0.57/samples/conf/app1.cnf /etc/masterha 

echo '' > /etc/masterha/app1.cnf vim /etc/masterha/app1.cnf 

[server default] manager_log=/var/log/masterha/app1/manager.log manager_workdir=/var/log/masterha/app1 master_binlog_dir=/usr/local/mysql/data master_ip_failover_script=/usr/local/bin/master_ip_failover master_ip_online_change_script=/usr/local/bin/master_ip_online_change password=manager ping_interval=1 remote_workdir=/tmp repl_password=123123 repl_user=myslave secondary_check_script=/usr/local/bin/masterha_secondary_check -s 192.168.184.30 -s 192.168.184.40 shutdown_script="" ssh_user=root user=mha [server1] hostname=192.168.159.130 port=3306 [server2] candidate_master=1 check_repl_delay=0 hostname=192.168.159.14 port=3306 [server3] hostname=192.168.159.11 port=3306 

[server default] manager_log=/var/log/masterha/app1/manager.log #manager日志 manager_workdir=/var/log/masterha/app1.log #manager工作目录 master_binlog_dir=/usr/local/mysql/data/ #master保存binlog的位置，这里的路径要与master里配置的binlog的路径一致，以便MHA能找到 master_ip_failover_script=/usr/local/bin/master_ip_failover #设置自动failover时候的切换脚本，也就是上面的那个脚本 master_ip_online_change_script=/usr/local/bin/master_ip_online_change #设置手动切换时候的切换脚本 password=manager #设置mysql中root用户的密码，这个密码是前文中创建监控用户的那个密码 ping_interval=1 #设置监控主库，发送ping包的时间间隔1秒，默认是3秒，尝试三次没有回应的时候自动进行failover remote_workdir=/tmp #设置远端mysql在发生切换时binlog的保存位置 repl_password=123123 #设置复制用户的密码 repl_user=myslave #设置复制用户的用户 report_script=/usr/local/send_report #设置发生切换后发送的报警的脚本 secondary_check_script=/usr/local/bin/masterha_secondary_check -s 192.168.184.30 -s 192.168.184.40 #指定检查的从服务器IP地址 shutdown_script="" #设置故障发生后关闭故障主机脚本（该脚本的主要作用是关闭主机防止发生脑裂,这里没有使用） ssh_user=root #设置ssh的登录用户名 user=mha #设置监控用户root [server1] hostname=192.168.159.130 port=3306 [server2] hostname=192.168.159.14 port=3306 candidate_master=1 #设置为候选master，设置该参数以后，发生主从切换以后将会将此从库提升为主库，即使这个主库不是集群中最新的slave check_repl_delay=0 #默认情况下如果一个slave落后master 超过100M的relay logs的话，MHA将不会选择该slave作为一个新的master， 因为对于这个slave的恢复需要花费很长时间；通过设置check_repl_delay=0，MHA触发切换在选择一个新的master的时候将会忽略复制延时，这个参数对于设置了candidate_master=1的主机非常有用，因为这个候选主在切换的过程中一定是新的master [server3] hostname=192.168.159.11 port=3306 

ifconfig ens33:1 192.168.159.200/24 

masterha_check_ssh -conf=/etc/masterha/app1.cnfg 

[root@localhost bin]# masterha_check_ssh -conf=/etc/masterha/app1.cnf Can't locate Log/Dispatch.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at /usr/local/share/perl5/MHA/SSHCheck.pm line 29. BEGIN failed--compilation aborted at /usr/local/share/perl5/MHA/SSHCheck.pm line 29. Compilation failed in require at /usr/local/bin/masterha_check_ssh line 25. BEGIN failed--compilation aborted at /usr/local/bin/masterha_check_ssh line 25.g 

masterha_check_repl -conf=/etc/masterha/app1.cnf 

nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 & 

nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 & 字段解析 --remove_dead_master_conf：该参数代表当发生主从切换后，老的主库的 ip 将会从配置文件中移除。 --manger_log：日志存放位置。 --ignore_last_failover：在缺省情况下，如果MHA检测到连续发生宕机，且两次宕机间隔不足 8 小时的话，则不会进行 Failover，之所以这样限制是为了避免 ping-pong 效应。该参数代表忽略上次 MHA 触发切换产生的文件，默认情况下，MHA发生切换后会在日志记目录，也就是上面设置的日志app1.failover.complete文件，下次再次切换的时候如果发现该目录下存在该文件将不允许触发切换，除非在第一次切换后收到删除该文件，为了方便，这里设置为--ignore_last_failover。 ##若要关闭 manager 服务，可以使用如下命令。 masterha_stop --conf=/etc/masterha/app1.cnf 或者可以直接采用 kill 进程 ID 的方式关闭。

– -ignore_last_failover：在缺省情况下，如果 MHA 检测到连续发生宕机，且两次宕机间隔不足 8 小时的话，则不会进行 Failover， 之所以这样限制是为了避免 ping-pong 效应。该参数代表忽略上次 MHA 触发切换产生的文件，默认情况下，MHA 发生切换后会在日志记目录，也就是上面设置的日志app1.failover.complete文件，下次再次切换的时候如果发现该目录下存在该文件将不允许触发切换，除非在第一次切换后收到删除该文件，为了方便，这里设置为–ignore_last_failover。

tail -f /var/log/masterha/app1/manager.log 

systemctl stop mysqld 

ifconfig