随笔15_tww

1.编写脚本，支持让用户自主选择，使用mysqldump还是xtraback全量备份。

PS3="please select your backup type:";
select type in mysqldump xtraback;do
case $REPLY in
1)
[ -e /data/backup ] || mkdir /data/backup
mysqldump -A --single-transaction -F |gzip > /data/backup/mysqldump_full_backup-$(date '+%Y%m%d-%H%M').sql.gz || (echo 'backup failed!' && exit 2 )
echo 'mysqldump full-backup successfully !'
break
;;
2)
xtrabackup --backup --target-dir=/data/backup/xtra_full_backup-$(date '+%Y%m%d-%H%M') &> /dev/null || (echo 'backup failed!' && exit 2 )
echo 'xtrabackup full-backup successfully !'
break
;;
*)
echo "please input number for your backup type "
esac
done

2.配置Mysql主从同步

主服务器配置(192.168.47.154)：
1.修改配置文件
vim /etc/my.cnf
server-id=1
log-bin=/var/lib/mysql/logbin_tao

2.systemctl restart mariadb

3.创建用户
grant replication slave on *.* to 'repluser'@'192.168.47.%' identified by 'tao'

从服务器配置(192.168.47.101 )
1.修改配置文件
vim /etc/my.cnf
server-id=2
read-only

2.CHANGE MASTER TO
        MASTER_HOST='192.168.47.154',
        MASTER_USER='repluser',
        MASTER_PASSWORD='tao',
        MASTER_PORT=3306,
        MASTER_LOG_FILE='logbin_tao.000001,
        MASTER_LOG_POS=404;

3.show slave status\G

4.start slave;

3.使用MHA实现Mysql高可用

1.准备：

1.)4台主机

192.168.47.100 (maha-manager)

192.168.47.101 (主服务器)

192.168.47.102 (从服务器)

192.168.47.103 (从服务器)

2.)时间同步，防火墙关闭/selinux关闭

2.安装

centos7_2 [主服务器 192.168.47.101]

#1.安装数据库

yum install mariadb-server -y

#2.修改配置文件

/etc/my.cnf

server-id=2

log-bin

ship_name-resolve

systemctl restart mariadb

#3.创建账号

MariaDB [(none)]> grant replication slave on *.* to repluser@'192.168.47.%' identified by 'tao';

MariaDB [(none)]> grant all on *.* to mhauser@'192.168.47.%' identified by 'tao';

查看二进制日志

MariaDB [(none)]> show master logs;

+--------------------+-----------+

| Log_name | File_size |

+--------------------+-----------+

| mariadb-bin.000001 | 534 |

+--------------------+-----------+

1 row in set (0.00 sec)

#4.安装mha4mysql-node-0.56-0.el6.noarch.rpm

yum install mha*.rpm

centos7_3 、centos7_4[从服务器192.168.47.102 、192.168.47.103]

#1.安装数据库

yum install mariadb-server -y

#2.修改配置文件

/etc/my.cnf

server-id=3

log-bin

read-only

skip_name_resolve

relay_log_purge=0

server-id=4

log-bin

read-only

skip_name_resolve

relay_log_purge=0

systemctl restart mariadb

#3.执行命令

MariaDB [(none)]> CHANGE MASTER TO

MASTER_HOST='192.168.47.101',

MASTER_USER='repluser',

MASTER_PASSWORD='tao',

MASTER_PORT=3306,

MASTER_LOG_FILE='mariadb-bin.000001',

MASTER_LOG_POS=245;

查看状态

MariaDB [(none)]> show slave status\G

启动

MariaDB [(none)]> start slave;

从节点有只读属性

MariaDB [(none)]> show variables like 'read_only';

+---------------+-------+

| Variable_name | Value |

+---------------+-------+

| read_only | ON |

+---------------+-------+

1 row in set (0.06 sec)

#4.安装mha4mysql-node-0.56-0.el6.noarch.rpm

yum install mha*.rpm

maha-manager[192.168.47.100]

#1.准备文件

mha4mysql-manager-0.56-0.el6.noarch.rpm

mha4mysql-node-0.56-0.el6.noarch.rpm

#2.安装软件

yum install mha*.rpm [开启epel源]

#3.基于key的验证

(1)ssh-keygen

[root@mha-manager ~]#ls -a .ssh

. .. id_rsa id_rsa.pub

(2)ssh-copy-id 192.168.47.100 (本机电脑的IP)

cd .ssh

[root@mha-manager .ssh]#ls

authorized_keys id_rsa id_rsa.pub known_hosts

(3)拷贝

scp -r .ssh 192.168.47.101:/root/

scp -r .ssh 192.168.47.102:/root/

scp -r .ssh 192.168.47.103:/root/

(4)测试:

ssh 192.168.47.101

ssh 192.168.47.102

ssh 192.168.47.103

#4.建立配置文件

mkdir /etc/mha/

vim /etc/mha/app1.cnf

------------------------

[server default]

user=mhauser

password=tao

manager_workdir=/data/mastermha/app1/

manager_log=/data/mastermha/app1/manager.log

remote_workdir=/data/mastermha/app1/

ssh_user=root

repl_user=repluser

repl_password=tao

ping_interval=1

[server1]

hostname=192.168.47.101

candidate_master=1

[server2]

hostname=192.168.47.102

candidate_master=1

[server3]

hostname=192.168.47.103

#5.检查

masterha_check_ssh --conf=/etc/mha/app1.cnf

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

#6.启动

masterha_manager --conf=/etc/mha/app1.cnf

测试

查看日志

主服务器

create databases tao;

create table testlog (id int auto_increment primary key,name char(10),age int default 20);

delimiter $$

create procedure sp_testlog()
begin
declare i int;
set i = 1;
while i <= 100000
do insert into testlog(name,age) values (concat('wang',i),i);
set i = i +1;
end while;
end$$

delimiter ;

call sp_testlog;

直接关闭主服务的电脑

查看日志

变为主服务器的电脑查看信息：【192.168.47.102】

最后把变成主服务器的配置文件/etc/my.cnf中的read_only去掉

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