mysql mha

准备3台虚拟机(此处用vagrant)

vagrant init envimation/ubuntu-xenial

修改Vagrantfile
配置网络模式和Ip(此处用140,141,142,143)
config.vm.network "public_network", ip:"192.168.1.140"


vagrant ssh

所有节点上执行

sudo apt-get install  libperl-dev
wget https://cpan.metacpan.org/authors/id/A/AN/ANDK/CPAN-2.22.tar.gz
tar zxf CPAN-2.22.tar.gz
cd CPAN-2.22
perl Makefile.PL
make 
sudo make install 

wget https://github.com/yoshinorim/mha4mysql-node/releases/download/v0.58/mha4mysql-node-0.58.tar.gz
tar zxf mha4mysql-node-0.58.tar.gz
cd mha4mysql-node-0.58
perl Makefile.PL
make 
sudo make install 
 sudo apt-get install mysql-server

143执行

sudo apt-get install  libperl-dev
wget https://cpan.metacpan.org/authors/id/A/AN/ANDK/CPAN-2.22.tar.gz
tar zxf CPAN-2.22.tar.gz
cd CPAN-2.22
perl Makefile.PL
make 
sudo make install 

wget https://github.com/yoshinorim/mha4mysql-manager/releases/download/v0.58/mha4mysql-manager-0.58.tar.gz
cd mha4mysql-manager-0.58
perl Makefile.PL
make
sudo make install

在所有节点上

ssh-keygen
然后吧~/.ssh/id_rsa.pub中的内容添加到其他节点的~/.ssh/authorized_keys中

修改140-142mysql配置(/etc/mysql/mysql.conf.d/mysqld.cnf)

bind 0.0.0.0
server-id       = 1(分别是1,2,3)
log_bin         = /var/log/mysql/mysql-bin.log
gtid_mode=ON
enforce-gtid-consistency=true

在140上(假设你设置的密码是test12345)

mysql -uroot -ptest12345

create user 'root'@'%' identified by 'test12345';
grant all privileges  on *.* to 'root'@'%';
create user 'repl'@'%' identified by 'test12345';
 grant replication slave on *.* to 'repl'@'%';
flush privileges;

在141,142上

mysql -uroot -ptest12345
CHANGE MASTER TO MASTER_HOST='192.168.1.140', MASTER_USER='repl',MASTER_PASSWORD='test12345', MASTER_PORT=3306, master_auto_position=1
set global relay_log_purge=0;
set global read_only=ON;
start slave;

在143上

添加配置/etc/app.cnf

[server default]
user=root
password=test12345
ssh_user=vagrant
#manager_workdir=/var/log/masterha/app1
#remote_workdir=/var/log/masterha/app1

[server1]
hostname=192.168.1.140

[server2]
hostname=192.168.1.141

[server3]
hostname=192.168.1.142

修改/usr/local/share/perl/5.22.1/MHA/NodeUtil.pm

sub parse_mysql_major_version($) {
  my $str = shift;
    $str =~ /(\d+)\.(\d+)/;
    my $strmajor = "$1.$2";
    my $result = sprintf( '%03d%03d', $strmajor =~ m/(\d+)/g );
    return $result;
}

启动

sudo masterha_manager --conf=/etc/app.cnf

在140上

create database test;
use test;
create table test(id bigint not null  auto_increment primary key, name varchar(100) not null default"");
insert into test(name) values("hello"),("world");

在141,142上验证

use test
select * from test;

验证failover

在140上

sudo service mysql stop

可以看到143上masterha_manager的日志

----- Failover Report -----

app1: MySQL Master failover 192.168.1.140(192.168.1.140:3306) to 192.168.1.141(192.168.1.141:3306)

Master 192.168.1.140(192.168.1.140:3306) is down!

Check MHA Manager logs at base-debootstrap for details.

Started automated(non-interactive) failover.
Selected 192.168.1.141(192.168.1.141:3306) as a new master.