lvs调度服务器

$root@localhost \~$ # ipvsadm -A -t 192.168.1.46:3306 -s rr

$root@localhost \~$ # ipvsadm -a -t 192.168.1.46:3306 -r 192.168.1.21:3306 -m

$root@localhost \~$ # ipvsadm -a -t 192.168.1.46:3306 -r 192.168.1.22:3306 -m

MySQL服务器

$root@localhost \~$ # route del default

$root@localhost \~$ # route add default gw 192.168.1.46

2024/8/14

haproxy负载均衡

$root@haproxy \~$ # yum -y install ntpdate

$root@haproxy \~$ # ntpdate cn.ntp.org.cn

$root@haproxy \~$ # yum -y install ntp

$root@haproxy \~$ # systemctl start ntpd

$root@haproxy \~$ # systemctl enable ntpd

$root@haproxy \~$ # yum -y install haproxy

$root@haproxy \~$ # vim /etc/haproxy/haproxy.cfg

frontend main *:80 63修改

use_backend static if url_static 67注释

default_backend web 68修改

backend web

balance roundrobin 87添加

server weba 192.168.1.40:80 check

server webb 192.168.1.41:80 check

$root@haproxy \~$ # systemctl start haproxy

$root@haproxy \~$ # systemctl enable haproxy

$root@haproxy \~$ # curl 192.168.1.50

web1

$root@haproxy \~$ # curl 192.168.1.50

web2

$root@haproxy \~$ # vim /etc/haproxy/haproxy.cfg（配置文件时注释最好删掉）

#定义web管理界面

listen statistics

93 bind *:9090 #定义监听端口

94 mode http #默认使用协议

95 stats enable #启用stats

96 stats uri /hadmin?stats #自定义统计页面的url

97 stats auth admin:admin #统计页面的账号密码

98 stats hide-version #隐藏在统计页面上的haproxy版本信息

100 stats refresh 30s #统计页面自动刷新时间

101 stats admin if TRUE #如果认证通过就做管理

102 stats realm hapadmin #统计页面密码框上提示文件，默认为haproxy\statistics

$root@haproxy \~$ # systemctl restart haproxy

浏览器访问：http://192.168.1.50:9090/hadmin?stats

加权

$root@haproxy \~$ # vim /etc/haproxy/haproxy.cfg

87 backend web

88 balance static-rr

89 server weba 192.168.1.40:80 weight 8 check

90 server webb 192.168.1.41:80 weight 2 check

systemctl restart haproxy

haproxy负载均衡MySQL

vim /etc/haproxy/haproxy.cfg

43 mode tcp

63 frontend main *:3306

67 # use_backend static if url_static

68 default_backend mysql

85 backend mysql

86 balance roundrobin

87 server master 192.168.1.21:3306 check

88 server slave 192.168.1.22:3310 check

systemctl restart haproxy

测试

$root@client bin$ # ./mysql -h192.168.1.34 -P3306 -uzhangmin -pzhangmin

mysql> show variables like 'server_id';

python3

$root@localhost \~$ # yum -y install python3

$root@localhost \~$ # pip3 config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple

$root@localhost \~$ # pip3 install pymysql

$root@localhost \~$ # python3

>>> import pymysql

主MySQL：

mysql> SELECT host FROM mysql.user WHERE user = 'zhangmin';

mysql> GRANT ALL PRIVILEGES ON test.* TO 'zhangmin'@'%';

mysql> FLUSH PRIVILEGES;

3.创建两个connenction对象，一个指向mastermysql，一个指向slave msyql

>>> master_conn=pymysql.connect(host="192.168.1.21",user="zhangmin",password="zhangmin",database="test",port=3306)

>>> slave_conn=pymysql.connect(host="192.168.1.22",user="zhangmin",password="zhangmin",database="test",port=3310)

获取数据游标 master

master_cursor=master_conn.cursor()

执行查询 master

select_sql="select * from user";

master_cursor.execute(select_sql);

rs=cursor.fetchall()

执行修改 master

>>> updatesql="update user set password='000' where username='aaa'"

>>> master_cursor.execute(updatesql)

执行删除 master

>>> master_conn.commit()

>>> delete_sql="delete from user where username='aaa'"

>>> master_cursor.execute(delete_aql)

master_conn.commit()

执行新增 master

insert_sql="insert into user values(1004,'dddddd','ddddddd')"

master_cursor.execute(insert_sql);

master_conn.commit()

执行查询 slave

>>> # 执行查询获得获得slave 游标

...

>>> slave_cursor=slave_conn.cursor()

>>> sql

'select * from user'

>>> slave_cursor.execute(sql)

>>> slave_cursor.fetchall()

((2,'bbb','bbbb'), (3,'ccc','cccc'),(1004,'ddddd','ddddddd'))

haproxy负载均衡及主从MySQL读写分离

use_backend static if url_static 67注释