[root@mha20 mha]# cp -r /usr/local/mha4mysql-manager-0.58/samples/scripts/master_ip_failover /etc/mha/##给脚本添加执行权限[root@mha20 mha]# chmod +x /etc/mha/master_ip_failover##下面是完整的脚本文件，需要修改VIP地址和网卡名称。[root@mha20 mha]# vim /etc/mha/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);
my $vip='192.168.2.100/24';#指定VIP地址
my $key='1';
my $ssh_start_vip="/sbin/ifconfig ens33:$key$vip";#这里需要注意的就是网卡名称，没人的主机网卡名不一样需要注意。
my $ssh_stop_vip="/sbin/ifconfig ens33:$key down";
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 "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";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";exit0;}else{&usage();exit1;}}
sub start_vip(){`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;}
sub stop_vip(){return0 unless ($ssh_user);`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=port\n";}
##监控用户是在管理服务器配置文件上指定的：user=xxx，password=xxxx##在主库上执行，从库自然同步过去。
mysql> grant all on *.* to 'mysqldb'@'%' identified by '1234';
Query OK, 0 rows affected, 1 warning (0.00 sec)
##在mysql30主服务关闭mysql服务[root@mysql30 ~]# systemctl stop mysqld.service##检查管理主机的配置文件是否删除mysql30的信息。[root@mha20 ~]# grep "192.168.2.30" /etc/mha/app1.cnf --执行这条命令可以看的出来，已经没有mysql30的信息了。##在管理主机上查看日志文件master现在是哪台？[root@mha20 ~]# grep "new master" /etc/mha/manager.log
Fri Feb 2414:58:16 2023 - [info] Searching new master from slaves..192.168.2.40(192.168.2.40:3306)(new master)
Fri Feb 2414:58:16 2023 - [info] Getting new master's binlog name and position..
Enabling the VIP - 192.168.2.100/24 on the new master - 192.168.2.40
Fri Feb 2414:58:17 2023 - [info] Resetting slave 192.168.2.50(192.168.2.50:3306) and starting replication from the new master 192.168.2.40(192.168.2.40:3306)..
Fri Feb 2414:58:18 2023 - [info] Resetting slave info on the new master..
Selected 192.168.2.40(192.168.2.40:3306) as a new master.
##可以看的出来mysql40被选举出来作为master##在mysql40上查看VIP地址是否在[root@mysql40 ~]# ifconfig ens33:1
ens33:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.100 netmask 255.255.255.0 broadcast 192.168.2.255
ether 00:0c:29:83:e3:d4 txqueuelen 1000(Ethernet)##查看mysql50的slave状态[root@mysql50 ~]# mysql -uroot -p1234 -e "show slave status \G;"|head -13|tail -11
mysql: [Warning] Using a password on the command line interface can be insecure.
Master_Host: 192.168.2.40 ---可以看的出来mysql40已经是masterl
Master_User: master
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master40.000001
Read_Master_Log_Pos: 154
Relay_Log_File: mysql50-relay-bin.000002
Relay_Log_Pos: 319
Relay_Master_Log_File: master40.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
##启动管理主机的mha服务[root@mha20 ~]# nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover &##查看mha状态[root@mha20 ~]# masterha_check_status --conf=/etc/mha/app1.cnf
app1 (pid:57758) is running(0:PING_OK), master:192.168.2.40
目录
一. 大致如下常见问题：
（1）找不到程序所依赖的Qt库 version Qt_5 not found (required by
（2）Could not Load the Qt platform plugin "xcb" in "" even though it was found
࿰…
