ProxySQLのインストール手順

投稿日：2024年1月7日更新日：2024年3月1日

ProxySQLとは

ProxySQLは、SQLクエリを仲介して、特定のデータベースに振り分けるロードバランサーになります。
クエリでフィルターをかけて、読み込みと書き込みで分散も行うことができます。

Download and Install ProxySQL

インストール

sudo cat <<EOF | sudo tee /etc/yum.repos.d/proxysql.repo
[proxysql_repo]
name=ProxySQL repository
baseurl=https://repo.proxysql.com/ProxySQL/proxysql-2.5.x/almalinux/8
gpgcheck=1
gpgkey=https://repo.proxysql.com/ProxySQL/proxysql-2.5.x/repo_pub_key
EOF

sudo yum install proxysql-2.5.5

設定ファイルの設定を行います。

vi /etc/proxysql.cnf

----------------------------------------
datadir="/var/lib/proxysql"
errorlog="/var/log/proxysql/proxysql.log"

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="0.0.0.0:6033;/tmp/proxysql.sock"
  default_schema="information_schema"
  stacksize=1048576
  server_version="5.1.30"
  connect_timeout_server=10000
  monitor_history=60000
  monitor_connect_interval=200000
  monitor_ping_interval=200000
  ping_interval_server_msec=10000
  ping_timeout_server=200
  commands_stats=true
  sessions_sort=true
  monitor_username="proxysql"
  monitor_password="pass"
}

mysql_replication_hostgroups =
(
  {
    writer_hostgroup=0
    reader_hostgroup=1
    comment="host groups"
  }
)

mysql_servers =
(
  { address="192.168.3.17", port=3306, hostgroup=0, max_connections=1000, max_replication_lag = 5 },
  { address="192.168.3.17", port=3306, hostgroup=1, max_connections=1000, max_replication_lag = 5 }
)

# MySQL へ Proxy 経由で接続するユーザ記載
mysql_users =
(
  { username = "ec2-user", password = "Servers", default_hostgroup = 0, max_connections=1000, active = 1 }
)

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
  },
  {
    rule_id=3
    active=1
    match_pattern=".*"
    destination_hostgroup=0
    apply=1
  }
)

接続確認を行い接続できたら完了

mysql -u ec2-user -pServers -P 6033 -h 127.0.0.1

------
[root@localhost ec2-user]# mysql -u admin -p -h 127.0.0.1 -P 6032 --prompt='ProxySQLAdmin> '
Enter password:admin
ERROR 1045 (28000): ProxySQL Error: Access denied for user 'admin'@'127.0.0.1' (using password: YES)
[root@localhost ec2-user]# mysql -u admin -p -h 127.0.0.1 -P 6032 --prompt='ProxySQLAdmin> '
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 6
Server version: 5.5.30 (ProxySQL Admin Module)

Copyright (c) 2000, 2023, Oracle and/or its affiliates.

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.

ProxySQLAdmin> SELECT hostgroup,srv_host,status,ConnOK,ConnERR,Queries,Bytes_data_sent FROM stats_mysql_connection_pool;
+-----------+--------------+--------+--------+---------+---------+-----------------+
| hostgroup | srv_host     | status | ConnOK | ConnERR | Queries | Bytes_data_sent |
+-----------+--------------+--------+--------+---------+---------+-----------------+
| 1         | 192.168.3.17 | ONLINE | 1      | 0       | 3       | 63              |
+-----------+--------------+--------+--------+---------+---------+-----------------+
1 row in set (0.01 sec)