mysql負載均衡-讀寫分離-ProxySQL

實驗：讀寫分離
四臺服務器
兩臺跑數據庫node1寫node2讀
ygl搭建proxysql
最後一臺當客戶端

首先，同步所有時間
這裏實驗使用的proxysql包是

proxysql-1.4.2-1-centos7.x86_64.rpm

首先這是接着上次的半同步複製繼續做的。
node1

MariaDB [(none)]> grant all on *.* to 'dbadmin'@'172.18.25.%' identified by 'dbpass';

MariaDB [(none)]> flush privileges;

修改配置ygl上面的配置

[ root@YGL /etc ]# cat proxysql.cnf

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"
    interfaces="0.0.0.0:3306;/tmp/mysql.sock"
    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 = "172.18.25.51" # 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 = "172.18.25.52" # 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 = 1           # 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 = "dbadmin" # no default , required
        password = "dbpass" # 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=0
                reader_hostgroup=1
                comment="production repl cluster"
       }
#       {
#                writer_hostgroup=50
#                reader_hostgroup=60
#                comment="test repl 2"
#        }
)

然後嘗試啓動服務

[ root@YGL /etc ]# service proxysql start
Starting ProxySQL: DONE!        #正常啓動方式

到這裏讀寫分離就成功了