day09_读写分离_Atlas小记
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' identified by 'mysql';
FLUSH PRIVILEGES;
主从库上全做
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yum install -y gcc*
rpm -ivh Atlas-2.2.1.el5.x86_64.rpm 【rpm包直接安装】
rpm -ql Atlas 【查看安装路径】
grep -v '^#' /usr/local/mysql-proxy/conf/test.cnf |grep -v '^$' > /usr/local/mysql-proxy/conf/lipengfei 【过滤垃圾提示符】
mv test.cnf test.cnf.old
cat /usr/local/mysql-proxy/conf/lipengfei > /usr/local/mysql-proxy/conf/test.cnf
rm -rf /usr/local/mysql-proxy/conf/lipengfei
/usr/local/mysql-proxy/bin/encrypt mysql 【mysql是我的密码，把密码加密】
TWbz0dlu35U=
vi /usr/local/mysql-proxy/conf/test.cnf
[mysql-proxy]
plugins = admin,proxy
admin-username=admin
admin-password=admin
admin-lua-script = /usr/local/mysql-proxy/lib/mysql-proxy/lua/admin.lua
proxy-backend-addresses = 192.168.8.100:3306
proxy-read-only-backend-addresses = 192.168.8.101:3306,192.168.8.102:3306
pwds = root:TWbz0dlu35U=
daemon = true
keepalive = true
event-threads = 8
log-level = message
log-path = /usr/local/mysql-proxy/log
instance = test
proxy-address = 0.0.0.0:1234
admin-address = 0.0.0.0:5678
charset = utf8
查看监听端口
netstat -tanlp | grep mysql
开启
/usr/local/mysql-proxy/bin/mysql-proxyd test start
/usr/local/mysql-proxy/bin/mysql-proxyd test stop
登录管理
mysql -h 192.168.8.103 -P 5678 -u admin -padmin
正常通过代理操作
mysql -h 192.168.8.103 -P 1234 -u root -pmysql
SHOW VARIABLES LIKE 'server_id';
mysql> select * from help;
+-------------------+---------------------------------------+
| command | description |
+-------------------+---------------------------------------+
| SELECT * FROM help | shows this help |
| SELECT * FROM backends | lists the backends and their state |
| SET OFFLINE $backend_id | offline backend server, $backend_id is backend_ndx's id |
| SET ONLINE $backend_id | online backend server, ... |
| ADD MASTER $backend | example: "add master 127.0.0.1:3306", ... |
| ADD SLAVE $backend | example: "add slave 127.0.0.1:3306", ... |
| REMOVE BACKEND $backend_id | example: "remove backend 1", ... |
| ADD CLIENT $client | example: "add client 192.168.1.2", ... |
| REMOVE CLIENT $client | example: "remove client 192.168.1.2", ... |
| SAVE CONFIG | save the backends to config file |
+-------------------+---------------------------------------+
10 rows in set (0.00 sec)
mysql> select * from backends;
+-------------+-------------------+-------+------+
| backend_ndx | address | state | type |
+-------------+-------------------+-------+------+
| 1 | 192.168.0.42:3306 | down | rw |
| 2 | 192.168.0.44:3306 | down | ro |
| 3 | 192.168.0.43:3306 | down | ro |
+-------------+-------------------+-------+------+
3 rows in set (0.00 sec)
5678端口：是Atlas的管理接口,此接口提供了查看mysql状态,设置上线、下线后端mysql服务器
访问方法使用mysql命令
mysql -h 10.142.132.50 -P2345 -u admin -p'admin'
这里的用户名密码是上面配置文件中的admin-username = admin、admin-password = admin
下面是管理接口的使用帮助
SELECT * FROM help; # 查看帮助信息
SELECT * FROM backends; # 查看后端主机状态
SET OFFLINE $backend_id # 下线一台主机,$backend_id == SELECT * FROM backends;查出来的ID
SET ONLINE $backend_id # 上线一台主机
ADD MASTER $backend # 添加一台master节点,如: ADD MASTER 10.57.1.131;
ADD SLAVE $backend # 添加一台slave节点,如 : ADD SLAVE 10.57.1.132;
REMOVE BACKEND $backend_id # 删除一个节点,
自动读写分离挺好，但有时候我写完马上就想读，万一主从同步延迟怎么办?
A: SQL语句前增加 /*master*/ 就可以将读请求强制发往主库
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将atlas设置成服务，并实现开机自动启动
# 说明：作者仅在CentOS7.0上进行了测试，而且没有进行可靠性和稳定性的测试！
cp /tmp/atlas /etc/rc.d/init.d/atlas
chmod +x /etc/rc.d/init.d/atlas
chkconfig --add atlas
chkconfig atlas on
#!/bin/sh
#description: atlas autorun
#your instance name
instance_name=test
case "$1" in
"start")
/usr/local/mysql-proxy/bin/mysql-proxyd $instance_name start
;;
"stop")
/usr/local/mysql-proxy/bin/mysql-proxyd $instance_name stop
;;
"restart")
/usr/local/mysql-proxy/bin/mysql-proxyd $instance_name restart
;;
"status")
/usr/local/mysql-proxy/bin/mysql-proxyd $instance_name status
;;
*)
echo "Usage: service atlas start/stop/restart/status "
;;
esac
使用命令如下：
service atlas start
service atlas stop
service atlas status
service atlas restart
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监控atlas脚本
cat /usr/local/mysql-proxy/bin/monitor_atlas.sh
#!/bin/bash
if [ $(ps -ef |grep 'mysql-proxy' |grep -v 'grep' |wc -l) -eq "0" ];then
/usr/local/mysql-proxy/bin/mysql-proxyd test start
sleep 5
if [ $(ps -ef |grep 'mysql-proxy' |grep -v 'grep' |wc -l) -eq "0" ];then
killall -9 keepalived
service network restart
fi
fi
chmod +x /usr/local/mysql-proxy/bin/monitor_atlas.sh
------------------------配置文件说明------------------------
[mysql-proxy]
#管理接口的用户名,根据自己需要定义
admin-username = admin
#管理接口的密码
admin-password = password
#Atlas后端连接的MySQL主库的IP和端口，可设置多项，用逗号分隔
proxy-backend-addresses = 10.57.1.131:3306
#Atlas后端连接的MySQL从库的IP和端口，@后面的数字代表权重，用来作负载均衡，若省略则默认为1，可设置多项，用逗号分隔
proxy-read-only-backend-addresses = 10.57.1.132:3306@1
#用户名与其对应的加密过的MySQL密码，密码使用PREFIX/bin目录下的加密程序encrypt加密，下行的user1和user2为示例，将其替换为你的MySQL的用户名和加密密码！
pwds = root:YQsbJY4G4oc=,test:YQsbJY4G4oc=
# 需要注意的是,这两个用户要在MySQL-Master上创建并开放对应的访问权限,这里的用户是需要对外开放使用的用户
#设置Atlas的运行方式，设为true时为守护进程方式，设为false时为前台方式，一般开发调试时设为false，线上运行时设为true
daemon = true
#设置Atlas的运行方式，设为true时Atlas会启动两个进程，一个为monitor，一个为worker，monitor在worker意外退出后会自动将其重启，设为false时只有worker，没有monitor，一般开发调试时设为false，线上运行时设为true
keepalive = true
#工作线程数，对Atlas的性能有很大影响，可根据情况适当设置
event-threads = 8
#日志级别，分为message、warning、critical、error、debug五个级别
log-level = message
#日志存放的路径
log-path = /usr/local/mysql-proxy/log
#SQL日志的开关，可设置为OFF、ON、REALTIME，OFF代表不记录SQL日志，ON代表记录SQL日志，REALTIME代表记录SQL日志且实时写入磁盘，默认为OFF
#sql-log = OFF
#实例名称，用于同一台机器上多个Atlas实例间的区分
#instance = test
#Atlas监听的工作接口IP和端口
proxy-address = 0.0.0.0:3306
#Atlas监听的管理接口IP和端口
admin-address = 0.0.0.0:2345
#连接池的最小空闲连接数，可根据业务请求量大小适当调大或调小
min-idle-connections = 128
#分表设置，此例中person为库名，mt为表名，id为分表字段，3为子表数量，可设置多项，以逗号分隔，若不分表则不需要设置该项
#tables = person.mt.id.3
#默认字符集，设置该项后客户端不再需要执行SET NAMES语句
charset = utf8
#允许连接Atlas的客户端的IP，可以是精确IP，也可以是IP段，以逗号分隔，若不设置该项则允许所有IP连接，否则只允许列表中的IP连接
client-ips = 127.0.0.1, 10.0.0
#Atlas前面挂接的LVS的物理网卡的IP(注意不是虚IP)，若有LVS且设置了client-ips则此项必须设置，否则可以不设置
#lvs-ips = 192.168.1.1
# End
