ProxySQL（八）—— 平移替换 MySQL Router

MySQL Router 当前配置为：

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[logger]
level = INFO
 
[routing:instance1]
bind_address = 0.0.0.0
bind_port = 7001
destinations = 172.20.1.29:18251
routing_strategy = first-available

[routing:instance2]
bind_address = 0.0.0.0
bind_port = 7002
destinations = 172.20.1.25:18251
routing_strategy = first-available

[routing:instance3]
bind_address = 0.0.0.0
bind_port = 7003
destinations = 172.20.1.15:18251
routing_strategy = first-available

[routing:instance4]
bind_address = 0.0.0.0
bind_port = 7004
destinations = 172.20.1.16:18251
routing_strategy = first-available

[routing:instance5]
bind_address = 0.0.0.0
bind_port = 7005
destinations = 172.20.1.19:18251
routing_strategy = first-available

[routing:instance6]
bind_address = 0.0.0.0
bind_port = 7006
destinations = 172.20.1.20:18251
routing_strategy = first-available

[routing:instance7]
bind_address = 0.0.0.0
bind_port = 7007
destinations = 172.20.1.17:18251
routing_strategy = first-available

[routing:instance8]
bind_address = 0.0.0.0
bind_port = 7008
destinations = 172.20.1.21:18251
routing_strategy = first-available

MySQL Router 配置核心逻辑 ： 8 个独立端口（7001-7008），每个端口一对一转发 到固定的 MySQL 后端（first-available = 仅连接第一个目标，失败则不可用），无负载均衡、无故障转移。

目标：

配置与 MySQL Router 等价的 ProxySQL（2.6.5），端口、后端、行为完全一致。
业务侧零改动，直接复用原连接地址和端口。

ProxySQL 配置如下：

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datadir="/var/lib/proxysql"

admin_variables=
{
    admin_credentials="admin:admin"
    mysql_ifaces="0.0.0.0:6032"
    refresh_interval=2000
}

mysql_variables=
{
    threads=4
    max_connections=2048
    default_query_delay=0
    default_query_timeout=36000000
    have_compress=true
    poll_timeout=2000
    interfaces="0.0.0.0:7001;0.0.0.0:7002;0.0.0.0:7003;0.0.0.0:7004;0.0.0.0:7005;0.0.0.0:7006;0.0.0.0:7007;0.0.0.0:7008"
    default_schema="information_schema"
    stacksize=1048576
    idle_timeout=28800
    connection_max_age_ms=0
    mysql_forward_authentication=1
}

# 必须把所有八个实例中用到的所有用户名都加上
# 因为 mysql_forward_authentication=1，这里密码可以随便写（只是个占位符），实际验证在后端 MySQL 中。
# 但用户必须配，用户名必须唯一。连接哪个实例就在哪个做认证
mysql_users =
(
    { username="wxy", password="x" },
    { username="u1", password="x" }
)

mysql_servers =
(
    { address="172.20.1.29", port=18251, hostgroup=1, status="ONLINE", weight=1 },
    { address="172.20.1.25", port=18251, hostgroup=2, status="ONLINE", weight=1 },
    { address="172.20.1.15", port=18251, hostgroup=3, status="ONLINE", weight=1 },
    { address="172.20.1.16", port=18251, hostgroup=4, status="ONLINE", weight=1 },
    { address="172.20.1.19", port=18251, hostgroup=5, status="ONLINE", weight=1 },
    { address="172.20.1.20", port=18251, hostgroup=6, status="ONLINE", weight=1 },
    { address="172.20.1.17", port=18251, hostgroup=7, status="ONLINE", weight=1 },
    { address="172.20.1.21", port=18251, hostgroup=8, status="ONLINE", weight=1 }
)

mysql_query_rules =
(
    { rule_id=1, active=1, port=7001, destination_hostgroup=1, apply=1 },
    { rule_id=2, active=1, port=7002, destination_hostgroup=2, apply=1 },
    { rule_id=3, active=1, port=7003, destination_hostgroup=3, apply=1 },
    { rule_id=4, active=1, port=7004, destination_hostgroup=4, apply=1 },
    { rule_id=5, active=1, port=7005, destination_hostgroup=5, apply=1 },
    { rule_id=6, active=1, port=7006, destination_hostgroup=6, apply=1 },
    { rule_id=7, active=1, port=7007, destination_hostgroup=7, apply=1 },
    { rule_id=8, active=1, port=7008, destination_hostgroup=8, apply=1 }
)

只需要做 3 步：

先把旧进程杀掉（防止端口冲突）

pkill proxysql

清空旧数据（必须！让新配置生效）

rm -rf /var/lib/proxysql/*

用命令直接启动

proxysql -c /etc/proxysql.cnf

✅ 启动完成！全部配置自动加载！

验证是否启动成功

ss -tulpn | grep proxysql

能看到 7001 ~ 7008 都在监听，就说明正常了。