第十五周作业
文章目录
- 编写脚本，支持让用户自主选择，使用mysqldump还是xtraback全量备份。
- 配置Mysql主从同步
- 使用MHA实现Mysql高可用
编写脚本，支持让用户自主选择，使用mysqldump还是xtraback全量备份。
#!/bin/bash
#
. /etc/init.d/functions
username=root
passname=123456
PS3="Please input a number[1|2]: "
mysqldumpdir=/mysqldumpdir
xtrabackupdir=/xtrabackupdir-`date +"%F-%T"`
[ -d $mysqldumpdir ] || mkdir $mysqldumpdir
select backup_method in mysqldump xtrabackup;do
case $backup_method in
mysqldump)
mysqldump -u${username} -p${passname} -A -F -E -R -q \
--single-transaction --master-data=1 --flush-privileges \
--triggers --default-character-set=utf8 \
> $mysqldumpdir/`date +"%F-%T"`.sql && \
action "`date +"%F-%T"` data backup to $mysqldumpdir" true || action "backup data" false
break
;;
xtrabackup)
xtrabackup --user=$username --password=$passname \
--backup --target-dir=$xtrabackupdir \
&> /dev/null && action "`date +"%F-%T"` data backup to $xtrabackupdir" true \
|| action "backup data" false
break
;;
*)
echo "not support"
;;
esac
done
配置Mysql主从同步
基于mysql5.7
master： 192.168.43.9
slave： 192.168.43.29
二进制包：/usr/local/src/mysql-5.7.28-linux-glibc2.12-x86_64.tar.gz
配置 MySQL master
vim /scripts/install_mysql5.7.sh
#!/bin/bash
#
. /etc/init.d/functions
SRC_DIR=`pwd`
MYSQL='mysql-5.7.28-linux-glibc2.12-x86_64.tar.gz'
COLOR="echo -e \\033[01;31m"
END='\033[0m'
MYSQL_ROOT_PASSWORD=123456
[ -d /data ] || mkdir /data
check (){
cd $SRC_DIR
if [ ! -e $MYSQL ];then
$COLOR"缺少${MYSQL}文件"$END
$COLOR"请将相关软件放在${SRC_DIR}目录下"$END
exit
elif [ -e /usr/local/mysql ];then
action "数据库已存在，安装失败" false
exit
else
return
fi
}
install_mysql(){
$COLOR"开始安装MySQL数据库..."$END
yum -y -q install numactl-libs libaio mariadb &> /dev/null
cd $SRC_DIR
tar xf $MYSQL -C /usr/local/
MYSQL_DIR=`echo $MYSQL| sed -nr 's/^(.*[0-9]).*/\1/p'`
ln -s /usr/local/$MYSQL_DIR /usr/local/mysql
chown -R root.root /usr/local/mysql/
id mysql &> /dev/null || { useradd -s /sbin/nologin -r mysql ; action "创建mysql用户"; }
echo 'PATH=/usr/local/mysql/bin/:$PATH' > /etc/profile.d/mysql.sh
. /etc/profile.d/mysql.sh
cat > /etc/my.cnf <<-EOF
[mysqld]
server-id=9
log-bin
datadir=/data/mysql
socket=/data/mysql/mysql.sock
log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid
[client]
socket=/data/mysql/mysql.sock
EOF
mysqld --initialize --user=mysql --datadir=/data/mysql
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
chkconfig --add mysqld
chkconfig mysqld on
service mysqld start
[ $? -ne 0 ] && { $COLOR"数据库启动失败，退出!"$END;exit; }
MYSQL_OLDPASSWORD=`awk '/A temporary password/{print $NF}' /data/mysql/mysql.log`
mysqladmin -uroot -p$MYSQL_OLDPASSWORD password $MYSQL_ROOT_PASSWORD &>/dev/null
action "数据库安装完成"
}
check
install_mysql
运行脚本
配置
sed -i '/\[mysqld\]/a\gtid_mode=on\nenforce_gtid_consistency' /etc/my.cnf
service mysqld restart
mysql -uroot -p123456 -e "grant replication slave on *.* to repluser@'192.168.43.%' identified by 'centos';flush privileges;"
配置 MySQL slave
scp 192.168.43.9:/usr/local/src/mysql-5.7.28-linux-glibc2.12-x86_64.tar.gz /usr/local/src/
scp 192.168.43.9:/scripts/install_mysql5.7.sh /usr/local/src/
修改 install_mysql5.7.sh这个脚本
将 server-id=9 改成 server-id=29
将 log-bin这行删除掉
增加下面2行
gtid_mode=on
enforce_gtid_consistency
运行脚本，配置连接主的ip，用户名，密码，开启自动找二进制文件位置
mysql -uroot -p123456
MySQL [(none)]> CHANGE MASTER TO
-> MASTER_HOST='192.168.43.9',
-> MASTER_USER='repluser',
-> MASTER_PASSWORD='centos',
-> MASTER_PORT=3306,
-> MASTER_auto_position=1;
MySQL [(none)]> start slave;
测试主从是否成功
在 master 上导入 hellodb_innodb.sql
mysql -uroot -p123456 < hellodb_innodb.sql
在从节点上查看
使用MHA实现Mysql高可用
1 ) 基于 mysql5.7 GTID 主从搭建已经ok了
2 ) 准备软件包
mha4mysql-node-0.56-0.el6.noarch.rpm
mha4mysql-manager-0.56-0.el6.noarch.rpm
MHA 机器上安装 mha4mysql-manager-0.56-0.el6.noarch.rpm，mha4mysql-node-0.56-0.el6.noarch.rpm
[MHA]#
yum install mha*.rpm -y
master，slave1，slave2安装mha4mysql-node-0.56-0.el6.noarch.rpm
[master]#
[slave1]#
[slave2]#
yum install mha4mysql-node-0.56-0.el6.noarch.rpm -y
3 ) 基于key的认证
[master]#
ssh-keygen -P "" -t rsa -f /root/.ssh/id_rsa &> /dev/null
ssh-copy-id 127.0.0.1
scp -r ~/.ssh/ 192.168.43.19:/root/
scp -r ~/.ssh/ 192.168.43.29:/root/
scp -r ~/.ssh/ 192.168.43.39:/root/
4 ) 配置文件
[master]# vim /etc/my.cnf
[mysqld]
server-id=19
log-bin
datadir=/data/mysql
socket=/data/mysql/mysql.sock
gtid_mode=on
enforce_gtid_consistency
skip_name_resolve
log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid
[client]
socket=/data/mysql/mysql.sock
[slave1]# vim /etc/my.cnf
[mysqld]
server-id=29
log-bin
datadir=/data/mysql
socket=/data/mysql/mysql.sock
gtid_mode=on
enforce_gtid_consistency
read_only
skip_name_resolve
relay_log_purge=0
log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid
[client]
socket=/data/mysql/mysql.sock
[slave2]# vim /etc/my.cnf
[mysqld]
server-id=39
log-bin
datadir=/data/mysql
socket=/data/mysql/mysql.sock
gtid_mode=on
enforce_gtid_consistency
read_only
skip_name_resolve
relay_log_purge=0
log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid
[client]
socket=/data/mysql/mysql.sock
5 ) master ,slave1,slave2都授权
[master]#
MySQL [(none)]> grant all on *.* to mhauser@'192.168.43.%' identified by 'centos';
MySQL [(none)]> flush privileges;
6 ) 管理节点配置文件
[MHA]#
mkdir /etc/mha/
vim /etc/mha/app1.cnf
[server default]
user=mhauser
password=centos
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=centos
ping_interval=1
[server1]
hostname=192.168.43.19
candidate_master=1
[server2]
hostname=192.168.43.29
[server3]
hostname=192.168.43.39
candidate_master=1
6 ) 测试 mha是否成功
测试ssh
测试 repl
7 ） 启动 mha
[MHA]#
masterha_manager --conf=/etc/mha/app1.cnf
8 ) 验证高可用性
当master挂了，会自动将master切换到backup节点上
