一、集群架构图

MySql数据库采用主主复制、主从同步架构即两主两从。

二、服务器规划

三、基础环境准备

1、安装jdk

查看jdk版本、保证jdk的版本在1.8以上

java -version

2、禁用NUMA

dmesg|grep -i numa
# vim /etc/default/grub
修改 GRUB_CMDLINE_LINUX="rhgb quiet" 添加 numa=off
修改后内容为 GRUB_CMDLINE_LINUX="rhgb quiet numa=off"

grub2-mkconfig -o /etc/grub2.cfg
#重启操作系统
reboot 
#重新确认numa被禁用
dmesg|grep -i numa 

3、禁用Selinux

sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
setenforce  0

4、禁用防火墙

#临时禁用，重启系统失效
systemctl stop firewalld
#永久禁用
systemctl disable firewalld

5、修改系统资源限制

vim /etc/security/limits.conf

*   soft   nproc   65535
*   hard   nproc   65535
*   soft   nofile  65535
*   hard   nofile  65535
# vim /etc/systemd/system.conf
DefaultLimitNOFILE=65536
DefaultLimitNPROC=65536

6、配置时间同步

tzselect
#一依次执行以下顺序
5-9-1-1>yes
rm /etc/localtime
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
#重启服务器
reboot

四、部署MySql集群（主主复制、主从复制）

1、下载MySQL安装包

官网下载mysql8 Arm版本rpm包mysql-8.0.25-1.el7.aarch64.rpm-bundle.tar

https://cdn.mysql.com/archives/mysql-8.0/mysql-8.0.25-1.el8.aarch64.rpm-bundle.tar

2、创建用户

#创建mysql用户设置密码
useradd mysql
passwd fqhOcqOK$61F

3、上传安装包

/home/mysql

4、安装MySQL

1、解压压缩包

tar -xvf mysql-8.0.25-1.el7.aarch64.rpm-bundle.tar

2、ll查看，安装包数量，并解压安装包

rpm -ivh mysql-community-common-8.0.25-1.el7.aarch64.rpm ----nodeps –force
rpm -ivh mysql-community-libs-8.0.25-1.el7.aarch64.rpm ----nodeps –force
rpm -ivh mysql-community-client-8.0.25-1.el7.aarch64.rpm ----nodeps –force
rpm -ivh mysql-community-server-8.0.25-1.el7.aarch64.rpm ----nodeps –force

3、查看安装情况

rpm -qa | grep mysql

4、初始化数据库

mysqld --initialize;

5、路径赋权

chown mysql:mysql /var/lib/mysql -R;

6、启动数据库

systemctl start mysqld.service;
systemctl enable mysqld;

7、查看数据库默认密码

cat /var/log/mysqld.log | grep password
#记录默认密码

8、登录数据库

mysql -uroot -p

9、修改数据库密码

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '密码';

10、建立远程连接

create user 'root'@'%' identified with mysql_native_password by '123456';
grant all privileges on *.* to 'root'@'%' with grant option;

11、刷新数据库权限

flush privileges;

5、配置双主双从

1、MySql-master1配置

修改my.cnf配置文件，vim /etc/my.cnf

[mysqld]

datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

#主服务器唯一ID （与 Master2，...... MasterN 的不同点）
server-id=1
#启用二进制日志
log-bin=mysql-bin

#从库的中继日志，主库日志写到中继日志，中继日志再重做到从库
# relay-log=myslql-relay-bin

# binlog保留时间7天
expire_logs_days=7

# binlog 文件的大小
max_binlog_size=1G

#设置logbin格式。取值：STATEMENT （默认），ROW，MIXED
binlog_format=ROW

# 该从库是否写入二进制日志。如果需要成为多主则可启用。只读可以不需要
log-slave-updates=1

# 该服务器自增列的初始值。（与 Master2，...... MasterN 的不同点）
auto-increment-offset=1

# 该服务器自增列增量。其默认值是1， 取值范围是1 .. 65535
auto-increment-increment=2


# 设置不要复制的数据库(可设置多个)
binlog-ignore-db=information_schema
binlog-ignore-db=mysql
binlog-ignore-db=performance_schema
binlog-ignore-db=sys

#设置需要复制的数据库（可选）。
# 如果要配置了此项，则 mysql 只复制下面指定的数据库。
# 如果不配置此项，则 mysql 默认复制所有的数据库（不包含 binlog-ignore-db 的数据库）
#binlog-do-db=需要复制的主数据库1
#binlog-do-db=需要复制的主数据库2

2、MySql-master2配置

修改my.cnf配置文件，vim /etc/my.cnf

[mysqld]

datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

#主服务器唯一ID （与 Master2，...... MasterN 的不同点）
server-id=3
#启用二进制日志
log-bin=mysql-bin

#从库的中继日志，主库日志写到中继日志，中继日志再重做到从库
# relay-log=myslql-relay-bin

# binlog保留时间7天
expire_logs_days=7

# binlog 文件的大小
max_binlog_size=1G

#设置logbin格式。取值：STATEMENT （默认），ROW，MIXED
binlog_format=ROW

# 该从库是否写入二进制日志。如果需要成为多主则可启用。只读可以不需要
log-slave-updates=1

# 该服务器自增列的初始值。（与 Master2，...... MasterN 的不同点）
auto-increment-offset=2

# 该服务器自增列增量。其默认值是1， 取值范围是1 .. 65535
auto-increment-increment=2


# 设置不要复制的数据库(可设置多个)
binlog-ignore-db=information_schema
binlog-ignore-db=mysql
binlog-ignore-db=performance_schema
binlog-ignore-db=sys

#设置需要复制的数据库（可选）。
# 如果要配置了此项，则 mysql 只复制下面指定的数据库。
# 如果不配置此项，则 mysql 默认复制所有的数据库（不包含 binlog-ignore-db 的数据库）
#binlog-do-db=需要复制的主数据库1
#binlog-do-db=需要复制的主数据库2

3、MySql-slave1配置

[mysqld]

datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

#从服务器唯一ID
server-id=2
#启用中继日志
relay-log=mysql-relay

4、MySql-slave2配置

[mysqld]

datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

#从服务器唯一ID
server-id=4
#启用中继日志
relay-log=mysql-relay

5、重启四台Mysql，使配置生效

systemctl restart mysqld.service

6、双MySql-master机器上创建账号，并授权远程复制

grant replication slave on *.* TO 'slave'@'%' identified by 'fqhOcqOK$61F';

如果报错，可以采用迂回的方式解决

create user slave identified BY 'fqhOcqOK$61F';

grant select, replication root, replication client on *.* TO 'slave'@'%';

grant all privileges on *.* TO 'slave'@'%';

flush privileges;

因为mysql8的加密方式与mysql5.7的不一样，在配置主从复制时容易出现Slave_IO_Running的状态不是YES，为了解决这个问题需要再执行一条命令

ALTER USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY 'fqhOcqOK$61F';

分别查看MySql-master1和MySql-master2的状态，记录下File和position的值，执行完此步骤后不要再操作主服务器MYSQL，防止主服务器状态值变化

show master status;

MySql-master1




MySql-master2

7、双MySql-slave机器上执行change master

1、change master格式

#复制主机的命令
change master to master_host='主机的IP地址',
master_user='slave',
master_password='123456',
master_log_file='File的内容',
master_log_pos=Position的内容;

2、在MySql-slave1上执行change master

change master to master_host='192.16.1.109',
master_user='dog',
master_password='123456',
master_log_file='mysql-bin.000001',
master_log_pos=1264;

3、在MySql-slave2上执行change master

change master to master_host='192.16.1.208',
master_user='root',
master_password='123456',
master_log_file='mysql-bin.000001',
master_log_pos=1264;

4、启动MySql-slave1和MySql-slave2的复制功能

start slave;

查看Slave的启动状态

show slave status\G

正常情况下，Slave_IO_Running 、Slave_SQL_Running 两个参数都是Yes，则说明主从配置成功！如遇到这种情况就需要排查问题了，

5、如想重新配置主从复制关系

1、停止从服务的复制功能

stop slave;

2、重置主从关系，重新配置主从

reset master;

8、配置主主复制关系

因为是双主双从，所以这里MySql-master1配置MySql-master2，MySql-master2配置MySql-master1

1、在MySql-master1执行

change master to master_host='192.16.1.208',
master_user='slave',
master_password='密码',
master_log_file='mysql-bin.000002',master_log_pos=156; ## Master1 的mysql-bin 相应参数

2、在MySql-master2执行

change master to master_host='192.16.1.109',
master_user='slave',
master_password='密码',
master_log_file='mysql-bin.000002',master_log_pos=156; ## Master1 的mysql-bin 相应参数

3、启动主从复制功能

start slave;

4、查看从服务器状态

show slave status\G

9、双主双从验证

在 MySql-master1主机新建库、新建表、 insert 记录， 然后在MySql-master2、MySql-slave1、MySql-slave2上查看复制 是否成功

五、部署ShardingSphere-Proxy集群(2台)

1、下载镜像

官网下载 https://mirrors.bfsu.edu.cn/apache/shardingsphere/5.0.0/apache-shardingsphere-5.0.0-shardingsphere-proxy-bin.tar.gz 其他版本自行官网下载
将压缩包上传到指定的路径下解压

mkdir -P /home/shardingsphere
tar -zxvf apache-shardingsphere-5.0.0-shardingsphere-proxy-bin.tar.gz -C /home/shardingsphere
mv apache-shardingsphere-5.0.0 proxy

2、下载MySql-connect.jar包

下载合适的驱动包，这里的驱动包是指与mysql数据库jdbc连接的jar包，官网下载：https://repo1.maven.org/maven2/mysql/mysql-connector-java/拷贝合适的驱动包到ShardingSphere-Proxy根目录的lib下(注：pgsql不需要引入)

/home/shardingsphere/proxy/lib/

3、修改配置文件（注意：每一个配置文件就是一个schema）

1、修改 server.yaml ， - root@%:passwd（修改密码）

<br />

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

######################################################################################################
# 
# If you want to configure governance, authorization and proxy properties, please refer to this file.
# 
######################################################################################################

scaling:
  blockQueueSize: 10000
  workerThread: 40
  clusterAutoSwitchAlgorithm:
    type: IDLE
    props:
      incremental-task-idle-minute-threshold: 30
  dataConsistencyCheckAlgorithm:
    type: DEFAULT
#
#mode:
#  type: Cluster
#  repository:
#    type: ZooKeeper
#    props:
#      namespace: governance_ds
#      server-lists: localhost:2181
#      retryIntervalMilliseconds: 500
#      timeToLiveSeconds: 60
#      maxRetries: 3
#      operationTimeoutMilliseconds: 500
#  overwrite: false
#
rules:
  - !AUTHORITY
    users:
      - root@%:passwd
      - sharding@:sharding
    provider:
      type: ALL_PRIVILEGES_PERMITTED
  - !TRANSACTION
    defaultType: XA
    providerType: Atomikos

props:
  max-connections-size-per-query: 1
  kernel-executor-size: 16  # Infinite by default.
  proxy-frontend-flush-threshold: 128  # The default value is 128.
  proxy-opentracing-enabled: false
  proxy-hint-enabled: false
  sql-show: false
  check-table-metadata-enabled: false
  show-process-list-enabled: false
    # Proxy backend query fetch size. A larger value may increase the memory usage of ShardingSphere Proxy.
    # The default value is -1, which means set the minimum value for different JDBC drivers.
  proxy-backend-query-fetch-size: -1
  check-duplicate-table-enabled: false
  sql-comment-parse-enabled: false
  proxy-frontend-executor-size: 0 # Proxy frontend executor size. The default value is 0, which means let Netty decide.
    # Available options of proxy backend executor suitable: OLAP(default), OLTP. The OLTP option may reduce time cost of writing packets to client, but it may increase the latency of SQL execution
    # if client connections are more than proxy-frontend-netty-executor-size, especially executing slow SQL.
  proxy-backend-executor-suitable: OLAP
  proxy-frontend-max-connections: 0 # Less than or equal to 0 means no limitation.
  sql-federation-enabled: false

2、修改 config-replica-query.yaml配置文件

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

######################################################################################################
# 
# Here you can configure the rules for the proxy.
# This example is configuration of replica-query rule.
# 
######################################################################################################
#
#schemaName: readwrite_splitting_db
#
#dataSources:
#  primary_ds:
#    url: jdbc:postgresql://127.0.0.1:5432/demo_primary_ds
#    username: postgres
#    password: postgres
#    connectionTimeoutMilliseconds: 30000
#    idleTimeoutMilliseconds: 60000
#    maxLifetimeMilliseconds: 1800000
#    maxPoolSize: 50
#    minPoolSize: 1
#  replica_ds_0:
#    url: jdbc:postgresql://127.0.0.1:5432/demo_replica_ds_0
#    username: postgres
#    password: postgres
#    connectionTimeoutMilliseconds: 30000
#    idleTimeoutMilliseconds: 60000
#    maxLifetimeMilliseconds: 1800000
#    maxPoolSize: 50
#    minPoolSize: 1
#  replica_ds_1:
#    url: jdbc:postgresql://127.0.0.1:5432/demo_replica_ds_1
#    username: postgres
#    password: postgres
#    connectionTimeoutMilliseconds: 30000
#    idleTimeoutMilliseconds: 60000
#    maxLifetimeMilliseconds: 1800000
#    maxPoolSize: 50
#    minPoolSize: 1
#
#rules:
#- !READWRITE_SPLITTING
#  dataSources:
#    pr_ds:
#      writeDataSourceName: primary_ds
#      readDataSourceNames:
#        - replica_ds_0
#        - replica_ds_1

######################################################################################################
#
# If you want to connect to MySQL, you should manually copy MySQL driver to lib directory.
#
######################################################################################################

schemaName: nacos

dataSources:
  write_ds:
    url: jdbc:mysql://192.16.1.109:3306/nacos?serverTimezone=UTC&useSSL=false
    username: root
    password: Csxpxc@1234!
    connectionTimeoutMilliseconds: 30000
    idleTimeoutMilliseconds: 60000
    maxLifetimeMilliseconds: 1800000
    maxPoolSize: 50
    minPoolSize: 1
  read_ds_0:
    url: jdbc:mysql://192.16.1.160:3306/nacos?serverTimezone=UTC&useSSL=false
    username: root
    password: Csxpxc@1234!
    connectionTimeoutMilliseconds: 30000
    idleTimeoutMilliseconds: 60000
    maxLifetimeMilliseconds: 1800000
    maxPoolSize: 50
    minPoolSize: 1
  read_ds_1:
    url: jdbc:mysql://192.16.1.50:3306/nacos?serverTimezone=UTC&useSSL=false
    username: root
    password: Csxpxc@1234!
    connectionTimeoutMilliseconds: 30000
    idleTimeoutMilliseconds: 60000
    maxLifetimeMilliseconds: 1800000
    maxPoolSize: 50
    minPoolSize: 1

rules:
- !READWRITE_SPLITTING
  dataSources:
    pr_ds:
      writeDataSourceName: write_ds
      readDataSourceNames:
        - read_ds_0
        - read_ds_1

3、启动测试

1、进入bin路径下，编辑启动脚本

vim start.sh
修改启动限制最小为328K

2、启动脚本

sh start.sh

3、查看启动日志

4、通过命令验证是否可以登录

mysql -uroot -P3307 -p

5、使用Navicate连接测试

六、部署keepalived+HA集群（2台）

1、下载安装包

官网下载keepalived-1.4.5.tar.gz安装包，https://www.keepalived.org/software/keepalived-1.4.5.tar.gz
和haproxy-2.2.3.tar.gz ，https://src.fedoraproject.org/repo/pkgs/haproxy/

2、安装必要的依赖包

1、部署HAproxy

修改内核参数

#查看默认参数
[root@haproxy01 keepalived]# cat /proc/sys/net/ipv4/ip_nonlocal_bind 
0

#修改参数
echo 1 > /proc/sys/net/ipv4/ip_nonlocal_bind
sysctl -w net.ipv4.ip_nonlocal_bind=1

#永久生效
echo 'net.ipv4.ip_nonlocal_bind=1' >> /etc/sysctl.conf

将haproxy-2.2.3.tar.gz安装包上传到对应路径下解压、编译

	cd /software
	tar -xvf haproxy-2.2.3.tar.gz 
	cd /software/haproxy-2.2.3
	make TARGET=linux2628 PREFIX=/usr/local/haproxy
	make install PREFIX=/usr/local/haproxy
	cp -rf /usr/local/haproxy/sbin/haproxy /usr/sbin/
  cp examples/haproxy.init /etc/init.d/haproxy
  #赋权
  chmod 755 /etc/init.d/haproxy
  #查看HAproxy的版本
  haproxy -v

配置rsyslog

  #创建目录
  mkdir /var/log/haproxy
  #目录赋权
  chmod a+w /var/log/haproxy

开启rsyslog记录HAproxy日志

vim /etc/rsyslog.conf
#将如下两行得注释取消
$ModLoad imudp
$UDPServerRun 514

#在该文件添加如下内容：
# Save haproxy log
local3.*                       /var/log/haproxy/haproxy.log

修改“/etc/sysconfig/rsyslog”文件，内容如下

vim /etc/sysconfig/rsyslog
# Options for rsyslogd
# Syslogd options are deprecated since rsyslog v3.
# If you want to use them, switch to compatibility mode 2 by "-c 2"
# See rsyslogd(8) for more details
SYSLOGD_OPTIONS="-r -m 0 -c 2"

创建HAproxy运行用户
以root用户身份分别在所有集群节点上执行如下命令创建需要的组和用户：

groupadd -r haproxy
useradd -g haproxy -M -s /sbin/nologin haproxy

配置HAproxy.cfg文件
以root用户身份分别在所有集群节点上编辑配置文件
vim /usr/local/haproxy/etc/haproxy.cfg配置haproxy.cfg文件
​

global
#设置日志
    chroot /usr/local/haproxy
    log 127.0.0.1   local3 info
#用户与用户组
    user haproxy
    group haproxy
#定义每个haproxy进程的最大连接数 ，由于每个连接包括一个客户端和一个服务器端，所以单个进程的TCP会话最大数目将是该值的两倍。
    maxconn 4096
# 以守护进程的方式运行
    daemon
defaults
log global
#日志中不记录空连接
option dontlognull
# 定义连接后端服务器的失败重连次数，连接失败次数超过此值后将会将对应后端服务器标记为不可用
retries 3
option redispatch
# 设置成功连接到一台服务器的最长等待时间，默认单位是毫秒
timeout connect 5000
# 设置连接客户端发送数据时的成功连接最长等待时间，默认单位是毫秒
timeout client 50000
# 设置服务器端回应客户度数据发送的最长等待时间，默认单位是毫秒
timeout server 50000
#统计页面
listen  admin_stats
        bind 192.16.1.193:48800  
        mode http
#采用http日志格式  
        option httplog
#统计页面自动刷新时间  
        stats refresh 30s
#统计页面url
        stats uri /admin_stats
#统计页面密码框上提示文本
        stats realm Haproxy Manager
#统计页面用户名和密码设置    
        stats auth admin:admin
#隐藏统计页面上HAProxy的版本信息
        stats hide-version
listen ShardingSphere_service
# 绑定192.16.1.193:3307:3307端口访问端口ShardingSphere3307
bind 192.16.1.193:3307
# 定义为tcp模式
      mode tcp
#采用http日志格式
      option tcplog
# 开启对后端服务器的健康检测
  option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www
# 设置haproxy的调度算法
      balance roundrobin
#根据调度分配到真实的后台地址，参数解释：port 48700:检测端口48700， inter 5s:5秒检测一次，rise 2:检测成功2次表示服务器可用，fall 3:检测失败3次后表示服务器不可用
  server ShardingSphere1 192.16.1.7:3307 check port 48700 inter 5s rise 2 fall 3
  server ShardingSphere2 192.16.1.8:3307 check port 48700 inter 5s rise 2 fall 3
#设置服务器端回应客户度数据发送的最长等待时间，默认单位是毫秒
 timeout server 20000
5:9066 cookie 2 check port 48700 inter 5s rise 2 fall 3
timeout server 20000

启动HAproxy

# /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.cfg

​

2、部署keepalived

yum install -y pcre-devel openssl-devel popt-devel
[root@master ~]# tar zxvf keepalived-1.4.5.tar.gz
[root@master ~]# cd keepalived-1.4.5
[root@master ~]#./configure --prefix=/usr/local/keepalived
make && make install

将编译好的文件拷贝到指定路径下

[root@master ~]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
[root@master ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@master ~]# mkdir /etc/keepalived/
[root@master ~]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
[root@master ~]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

3、修改配置文件

Master节点

! Configuration File forkeepalived
global_defs {
script_user root
enable_script_security
notification_email {
test@sina.com
 }
notification_email_from  admin@test.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id HAproxy      #标识，双主相同
 }
 
vrrp_script chk_haproxy {
    script "/etc/keepalived/check_haproxy.sh"  ## 检测haproxy状态的脚本路径
    interval 2  ## 检测时间间隔
    weight 2  ## 如果条件成立，权重+2 
}
 
vrrp_instance VI_1 {
 state MASTER           #两台都设置BACKUP
 interface eth0
 virtual_router_id 51       #主备相同
 priority 100           #优先级，backup设置90
 advert_int 1
 nopreempt             #不主动抢占资源，只在master这台优先级高的设置，backup不设置
 authentication {
 auth_type PASS
 auth_pass 1111
 }
 
## 将track_script块加入instance 配置块
track_script {
 chk_haproxy  ## 检查HAProxy服务是否存活
 }

 virtual_ipaddress {
 192.16.1.193
 }
}

Backup节点

! Configuration File forkeepalived
global_defs {
script_user root
enable_script_security
notification_email {
test@sina.com
 }
notification_email_from  admin@test.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id HAproxy      #标识，双主相同
 }
 
vrrp_script chk_haproxy {
    script "/etc/keepalived/check_haproxy.sh"  ## 检测haproxy状态的脚本路径
    interval 2  ## 检测时间间隔
    weight 2  ## 如果条件成立，权重+2 
}
 
vrrp_instance VI_1 {
 state BACKUP           #两台都设置BACKUP
 interface eth0
 virtual_router_id 51       #主备相同
 priority 90           #优先级，backup设置90
 advert_int 1             #不主动抢占资源，只在master这台优先级高的设置，backup不设置
 authentication {
 auth_type PASS
 auth_pass 1111
 }
 
## 将track_script块加入instance 配置块
track_script {
 chk_haproxy  ## 检查HAProxy服务是否存活
 }

 virtual_ipaddress {
 192.16.1.193
 }
}

编辑端口探测脚本check_haproxy.sh

# vim /etc/keepalived/check_haproxy.sh  //添加如下内容保存
	#!/bin/bash
	START_HAPROXY="/etc/init.d/haproxy start"
	LOG_FILE="/var/log/keepalived-haproxy-state.log"
	if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then
	  echo "`date "+%Y-%m-%d %H:%M:%S"` --- haproxy is down,next will restart haproxy" >> $LOG_FILE
	  echo $START_HAPROXY >> $LOG_FILE
	  $START_HAPROXY &>> $LOG_FILE
	  sleep 2
	  if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then
	    echo "start haproxy failed,will killall keepalived" >> $LOG_FILE
	    killall keepalived
	  else
	    echo "`date "+%Y-%m-%d %H:%M:%S"` --- haproxy restart successful" >> $LOG_FILE
	  fi
	fi

给脚本赋权

chmod +x /etc/keepalived/check_haproxy.sh

启动keepalived

systemctl start keepalived
#查看keepalived运行状态
systemctl status keepalived
chkconfig keepalived on //设置开机启动