CentOS环境下PostgreSQL的集群部署

在CentOS环境下部署PostgreSQL集群，通常指的是使用Patroni来管理PostgreSQL的高可用性。Patroni是一个用于管理PostgreSQL、MariaDB和MongoDB集群的工具，它可以确保数据库的高可用性和故障转移。

以下是在CentOS环境下使用Patroni部署PostgreSQL集群的基本步骤：

前提条件

1. CentOS 7.x：确保你的系统是CentOS 7.x版本。
2. PostgreSQL：至少安装两个PostgreSQL实例，用于实现高可用性。
3. Pacemaker：集群资源管理器，用于管理集群资源。
4. Corosync：集群消息传递和成员管理工具。
5. Patroni：用于管理PostgreSQL集群。

安装依赖

sudo yum install -y centos-release-scl
sudo yum install -y rh-postgresql96 rh-postgresql96-server
sudo yum install -y pacemaker corosync

配置Pacemaker和Corosync

1. 编辑/etc/corosync/corosync.conf：

totem {
    version: 2
    cluster_name: pg_cluster
    transport: udpu
}

nodelist {
    node {
        ring0_addr: node1.example.com
        nodeid: 1
    }
    node {
        ring0_addr: node2.example.com
        nodeid: 2
    }
}

quorum {
    provider: corosync_votequorum
}

logging {
    to_logfile: yes
    logfile: /var/log/corosync/corosync.log
    to_syslog: yes
}

2. 启动并启用Corosync服务：

sudo systemctl start corosync
sudo systemctl enable corosync

3. 验证Corosync状态：

sudo crm status

安装和配置Patroni

1. 安装Patroni：

sudo yum install -y python3-pip
sudo pip3 install patroni

2. 创建Patroni配置文件（例如/etc/patroni.yml）：

scope: postgresql
name: postgresql
namespace: /db/
restapi:
  listen: 0.0.0.0
  connect_address: 127.0.0.1
  ssl:
    cert_file: /etc/pki/tls/certs/postgresql.pem
    key_file: /etc/pki/tls/private/postgresql.key
    verify_mode: verify_none
pg_hba:
- host    replication     replicator     127.0.0.1/32            md5
- host    all             all             0.0.0.0/0               md5
authentication:
  replication:
    username: replicator
    password: your_password
postgresql:
  listen: 0.0.0.0
  connect_address: 127.0.0.1
  data_dir: /var/lib/pgsql/9.6/data
  pg_hba:
  - host    replication     replicator     127.0.0.1/32            md5
  - host    all             all             0.0.0.0/0               md5
  authentication:
    replication:
      username: replicator
      password: your_password
  parameters:
    wal_level: replica
    max_wal_senders: 4
    wal_keep_segments: 8
  tags:
  - nofailover
  - noloadbalance
  - clonefrom
  - nosync
  initdb:
  - encoding: UTF8
  - data-checksums
  - timezone: UTC
  - unix_socket_directories:
  - /var/run/postgresql
  - /tmp
  - override:
      - parameter: wal_level
        value: replica
      - parameter: max_wal_senders
        value: 4
      - parameter: wal_keep_segments
        value: 8
  recovery_target_timeline: latest
  recovery_target_xid: 0
  recovery_target_name: latest
  recovery_target_inclusive: true
  recovery_target_time: '2023-04-01T00:00:00'
  recovery_target_lsn: '0/0'
  recovery_target_xlog: '0/0'
  recovery_target_state: stream
  recovery_target_priority: 100
  recovery_target_action: promote
  recovery_target_timeout: 300
  recovery_target_wait_for_primary: false
  recovery_target_wait_for_standby: false
  recovery_target_wait_for_backup: false
  recovery_target_wait_for_recovery: false
  recovery_target_wait_for_promote: false
  recovery_target_wait_for_demote: false
  recovery_target_wait_for Salary: false
  recovery_target_wait_for Salary: false
  recovery_target_wait_for Salary: false
  recovery_target_wait_for Salary: false
  recovery_target_wait_for Salary: false
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