os:centos 7.4
mysql: 5.7
proxysql: 1.4.10

ip 规划如下：

192.168.56.101 node1 (proxysql)

192.168.56.102 node2 (mysql master)
192.168.56.103 node3 (mysql slave)
192.168.56.104 node4 (mysql slave)

安装mysql 5.7

node2、node3、node4 安装 mysql 5.7 software
详细过称略，参考另外一篇博客。

初始化mysql 5.7，配置好master slave

node2、node3、node4 各个节点先初始化 mysql 5.7，再配置 master/slave

master 修改密码

mysql> set password for 'root'@'localhost'= password('2wsx3edc');
mysql> flush privileges;

master 创建复制用户

mysql> create user 'replicator'@'192.168.56.%' identified by '2wsx3edc';
mysql> grant replication slave on *.* to 'replicator'@'192.168.56.%';
mysql> flush privileges;

master 使用 mysqldump 出集合,再在slave端导入

# mysqldump -uroot -p --master-data=2 --single-transaction -R --triggers -A > mysql_all.sql

其中
–master-data=2代表备份时刻记录master的Binlog位置和Position,
–single-transaction意思是获取一致性快照，
-R意思是备份存储过程和函数，
–triggres的意思是备份触发器，
-A代表备份所有的库。

mysql> change master to
  master_host='192.168.56.102',
  master_user='replicator',
  master_password='2wsx3edc',
  master_port=3306,
  master_log_file='mysql-bin.000001',
  master_log_pos=154;
mysql> start slave;  

salve设置为 read only，从库对外提供读服务，只所以没有写进配置文件，是因为随时slave会提升为master。

mysql> set global read_only=1;
mysql> set global relay_log_purge=0;

至此，已经配置好了1master、2slave

配置本地免密登录

登录主机后，登录mysql需要输入密码，配置个密码文件。免得每次都需要输入密码。
node2、node3、node4节点都需要操作

# vi ~/.my.cnf

[client] 
host=localhost 
user='root' 
password='2wsx3edc'

# chmod 700 ~/.my.cnf

下载、安装 proxysql

node1 节点安装mysql 5.7 client，mysql 5.7 lib

# yum install mysql-community-client mysql-community-common mysql-community-devel mysql-community-libs mysql-community-libs-compat 

node1 节点安装 proxysql
下载地址如下：
https://github.com/sysown/ProxySQL
或者
https://www.percona.com/downloads/proxysql/

安装依赖包

# yum install perl-DBI perl-DBD-MySQL perl-Time-HiRes perl-IO-Socket-SSL

# cd /etc/yum.repos.d/
# cat <<EOF | tee /etc/yum.repos.d/proxysql.repo
[proxysql_repo]
name= ProxySQL YUM repository
baseurl=http://repo.proxysql.com/ProxySQL/proxysql-1.4.x/centos/\$releasever
gpgcheck=1
gpgkey=http://repo.proxysql.com/ProxySQL/repo_pub_key
EOF
# yum install proxysql 
=======================================================================================================================================
 Package                        Arch                         Version                         Repository                           Size
=======================================================================================================================================
Installing:
 proxysql                       x86_64                       1.4.10-1                        proxysql_repo                       5.7 M

Transaction Summary
=======================================================================================================================================

查看 proxysql-1.4.10-1.x86_64 涉及到哪些文件

# rpm -ql proxysql-1.4.10-1.x86_64
/etc/init.d/proxysql
/etc/proxysql.cnf
/usr/bin/proxysql
/usr/share/proxysql/tools/proxysql_galera_checker.sh
/usr/share/proxysql/tools/proxysql_galera_writer.pl

# systemctl status proxysql.service 
● proxysql.service - LSB: High Performance Advanced Proxy for MySQL
   Loaded: loaded (/etc/rc.d/init.d/proxysql; bad; vendor preset: disabled)
   Active: inactive (dead)
     Docs: man:systemd-sysv-generator(8)
# cat /etc/init.d/proxysql

/etc/init.d/proxysql 脚本涉及到如下目录、文件

OLDDATADIR="/var/run/proxysql"
DATADIR="/var/lib/proxysql"
OPTS="-c /etc/proxysql.cnf -D $DATADIR"
PIDFILE="$DATADIR/proxysql.pid"

/run/systemd/generator.late/proxysql.service

# more /run/systemd/generator.late/proxysql.service
# Automatically generated by systemd-sysv-generator

[Unit]
Documentation=man:systemd-sysv-generator(8)
SourcePath=/etc/rc.d/init.d/proxysql
Description=LSB: High Performance Advanced Proxy for MySQL
Before=runlevel2.target
Before=runlevel3.target
Before=runlevel4.target
Before=runlevel5.target
Before=shutdown.target
After=network-online.target
Conflicts=shutdown.target

[Service]
Type=forking
Restart=no
TimeoutSec=5min
IgnoreSIGPIPE=no
KillMode=process
GuessMainPID=no
RemainAfterExit=yes
ExecStart=/etc/rc.d/init.d/proxysql start
ExecStop=/etc/rc.d/init.d/proxysql stop
ExecReload=/etc/rc.d/init.d/proxysql reload

配置文件 /etc/proxysql.cnf

检查版本

# which proxysql
/usr/bin/proxysql
# proxysql --version
ProxySQL version v1.4.10-1-g5eb0f3e, codename Truls

# proxysql --help
High Performance Advanced Proxy for MySQL

USAGE: proxysql [OPTIONS]

OPTIONS:

-c, --config ARG             Configuraton file
-D, --datadir ARG            Datadir
-e, --exit-on-error          Do not restart ProxySQL if crashes
-f, --foreground             Run in foreground
-h, -help, --help, --usage   Display usage instructions.
-M, --no-monitor             Do not start Monitor Module
-n, --no-start               Starts only the admin service
-r, --reuseport              Use SO_REUSEPORT
-S, --admin-socket ARG       Administration Unix Socket
-V, --version                Print version
--idle-threads               Create auxiliary threads to handle idle connections
--initial                    Rename/empty database file
--reload                     Merge config file into database file
--sqlite3-server             Enable SQLite3 Server


ProxySQL rev. v1.4.10-1-g5eb0f3e -- Tue Aug  7 12:31:55 2018
Copyright (C) 2013-2018 ProxySQL LLC
This program is free and without warranty

有 -c –config 的option，可以把参数全部导入到参数文件，易于管理。

配置proxysql.cnf

# cp /etc/proxysql.cnf /etc/proxysql.cnf.bak
# vi /etc/proxysql.cnf

配置文件只在第一次启动的时候读取进行初始化，后面只读取db文件。
所以还是先启动，然后再修改参数。

启动 proxysql

# service proxysql start
Starting ProxySQL: 2018-08-13 11:08:25 [INFO] Using config file /etc/proxysql.cnf
DONE!

# ps -ef|grep -i proxysql
root      7859     1  0 11:08 ?        00:00:00 proxysql -c /etc/proxysql.cnf -D /var/lib/proxysql
root      7860  7859  0 11:08 ?        00:00:00 proxysql -c /etc/proxysql.cnf -D /var/lib/proxysql

# netstat -antp|grep -i 7859
# netstat -antp|grep -i 7860
tcp        0      0 0.0.0.0:6032            0.0.0.0:*               LISTEN      7860/proxysql       
tcp        0      0 0.0.0.0:6033            0.0.0.0:*               LISTEN      7860/proxysql 

根据 /etc/proxysql.cnf 文件内容，6032 是管理端口，6033 是 mysql 连接端口。

连接 proxysql 6032 管理端口

# mysql -u admin -padmin -h 127.0.0.1 -P6032 --prompt='Admin> '
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.30 (ProxySQL Admin Module)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

Admin> 

proxysql 的安装先说的这里，下一篇blog说下配置。

参考：
http://www.proxysql.com/
http://www.proxysql.com/compare

https://www.percona.com/downloads/proxysql/

https://github.com/sysown/proxysql/releases
https://github.com/sysown/ProxySQL
https://github.com/sysown/proxysql/wiki

cat /etc/proxysql.cnf

#file proxysql.cfg

########################################################################################
# This config file is parsed using libconfig , and its grammar is described in:        
# http://www.hyperrealm.com/libconfig/libconfig_manual.html#Configuration-File-Grammar 
# Grammar is also copied at the end of this file                                       
########################################################################################

########################################################################################
# IMPORTANT INFORMATION REGARDING THIS CONFIGURATION FILE:                             
########################################################################################
# On startup, ProxySQL reads its config file (if present) to determine its datadir. 
# What happens next depends on if the database file (disk) is present in the defined
# datadir (i.e. "/var/lib/proxysql/proxysql.db").
#
# If the database file is found, ProxySQL initializes its in-memory configuration from 
# the persisted on-disk database. So, disk configuration gets loaded into memory and 
# then propagated towards the runtime configuration. 
#
# If the database file is not found and a config file exists, the config file is parsed 
# and its content is loaded into the in-memory database, to then be both saved on-disk 
# database and loaded at runtime.
#
# IMPORTANT: If a database file is found, the config file is NOT parsed. In this case
#            ProxySQL initializes its in-memory configuration from the persisted on-disk
#            database ONLY. In other words, the configuration found in the proxysql.cnf
#            file is only used to initial the on-disk database read on the first startup.
#
# In order to FORCE a re-initialise of the on-disk database from the configuration file 
# the ProxySQL service should be started with "service proxysql initial".
#
########################################################################################

datadir="/var/lib/proxysql"

admin_variables=
{
    admin_credentials="admin:admin"
#   mysql_ifaces="127.0.0.1:6032;/tmp/proxysql_admin.sock"
    mysql_ifaces="0.0.0.0:6032"
#   refresh_interval=2000
#   debug=true
}

mysql_variables=
{
    threads=4
    max_connections=2048
    default_query_delay=0
    default_query_timeout=36000000
    have_compress=true
    poll_timeout=2000
#   interfaces="0.0.0.0:6033;/tmp/proxysql.sock"
    interfaces="0.0.0.0:6033"
    default_schema="information_schema"
    stacksize=1048576
    server_version="5.5.30"
    connect_timeout_server=3000
# make sure to configure monitor username and password
# https://github.com/sysown/proxysql/wiki/Global-variables#mysql-monitor_username-mysql-monitor_password
    monitor_username="monitor"
    monitor_password="monitor"
    monitor_history=600000
    monitor_connect_interval=60000
    monitor_ping_interval=10000
    monitor_read_only_interval=1500
    monitor_read_only_timeout=500
    ping_interval_server_msec=120000
    ping_timeout_server=500
    commands_stats=true
    sessions_sort=true
    connect_retries_on_failure=10
}


# defines all the MySQL servers
mysql_servers =
(
#   {
    
#       address = "127.0.0.1" # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
#       port = 3306           # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
#       hostgroup = 0           # no default, required
#       status = "ONLINE"     # default: ONLINE
#       weight = 1            # default: 1
#       compression = 0       # default: 0
#   max_replication_lag = 10  # default 0 . If greater than 0 and replication lag passes such threshold, the server is shunned
#   },
#   {
    
#       address = "/var/lib/mysql/mysql.sock"
#       port = 0
#       hostgroup = 0
#   },
#   {
    
#       address="127.0.0.1"
#       port=21891
#       hostgroup=0
#       max_connections=200
#   },
#   { address="127.0.0.2" , port=3306 , hostgroup=0, max_connections=5 },
#   { address="127.0.0.1" , port=21892 , hostgroup=1 },
#   { address="127.0.0.1" , port=21893 , hostgroup=1 }
#   { address="127.0.0.2" , port=3306 , hostgroup=1 },
#   { address="127.0.0.3" , port=3306 , hostgroup=1 },
#   { address="127.0.0.4" , port=3306 , hostgroup=1 },
#   { address="/var/lib/mysql/mysql.sock" , port=0 , hostgroup=1 }
)


# defines all the MySQL users
mysql_users:
(
#   {
    
#       username = "username" # no default , required
#       password = "password" # default: ''
#       default_hostgroup = 0 # default: 0
#       active = 1            # default: 1
#   },
#   {
    
#       username = "root"
#       password = ""
#       default_hostgroup = 0
#       max_connections=1000
#       default_schema="test"
#       active = 1
#   },
#   { username = "user1" , password = "password" , default_hostgroup = 0 , active = 0 }
)



#defines MySQL Query Rules
mysql_query_rules:
(
#   {
    
#       rule_id=1
#       active=1
#       match_pattern="^SELECT .* FOR UPDATE$"
#       destination_hostgroup=0
#       apply=1
#   },
#   {
    
#       rule_id=2
#       active=1
#       match_pattern="^SELECT"
#       destination_hostgroup=1
#       apply=1
#   }
)

scheduler=
(
#  {
    
#    id=1
#    active=0
#    interval_ms=10000
#    filename="/var/lib/proxysql/proxysql_galera_checker.sh"
#    arg1="0"
#    arg2="0"
#    arg3="0"
#    arg4="1"
#    arg5="/var/lib/proxysql/proxysql_galera_checker.log"
#  }
)


mysql_replication_hostgroups=
(
#        {
    
#                writer_hostgroup=30
#                reader_hostgroup=40
#                comment="test repl 1"
#       },
#       {
    
#                writer_hostgroup=50
#                reader_hostgroup=60
#                comment="test repl 2"
#        }
)




# http://www.hyperrealm.com/libconfig/libconfig_manual.html#Configuration-File-Grammar
#
# Below is the BNF grammar for configuration files. Comments and include directives are not part of the grammar, so they are not included here. 
#
# configuration = setting-list | empty
#
# setting-list = setting | setting-list setting
#     
# setting = name (":" | "=") value (";" | "," | empty)
#     
# value = scalar-value | array | list | group
#     
# value-list = value | value-list "," value
#     
# scalar-value = boolean | integer | integer64 | hex | hex64 | float
#                | string
#     
# scalar-value-list = scalar-value | scalar-value-list "," scalar-value
#     
# array = "[" (scalar-value-list | empty) "]"
#     
# list = "(" (value-list | empty) ")"
#     
# group = "{" (setting-list | empty) "}"
#     
# empty =