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  • postgres-xl 集体搭建(2)

    $ pgxc_ctl prepare config minimal

    生成一个单机伪分布集群配置简单模板

    根据该模板进行简单修改就可以配置成一个集群

    $ pgxc_ctl init all

    $ pgxc_ctl start all

    $PGXC monitor all
    Running: gtm master
    Running: gtm slave
    Running: gtm proxy gtm_pxy1
    Running: gtm proxy gtm_pxy2
    Running: coordinator master coord1
    Running: coordinator master coord2
    Running: datanode master datanode_1
    Running: datanode master datanode_2

    ----------------------------成功第一步-------------------------------------

    下面重点介绍下slave node 节点配置

     在配置文件中  pgxc_ctl.conf

    4) Gtm master and slave can have different port to listen, while coordinator and datanode
    # slave should be assigned the same port number as master.
    #
    # 5) Port nuber of a coordinator slave must be the same as its master.

    # Master and slave use the same port!

    ****值得特别注意 主从 端口号要保持高度一致(所以在官方的demo中的单机版伪分布不能创建slave节点)

    pgxc_ctl.conf 配置修改

    datanodeSlave=y

    coordSlave=y

    退出PGXC 再次进入将重新加载配置文件

    $PGXC monitor all
    Running: gtm master
    Running: gtm slave
    Running: gtm proxy gtm_pxy1
    Running: gtm proxy gtm_pxy2
    Running: 
    Not running: coordinator slave coord1
    Running: coordinator master coord2
    Not running: coordinator slave coord2
    Running: datanode master datanode_1
    Not running: datanode slave datanode_1
    Running: datanode master datanode_2
    Not running: datanode slave datanode_2

    如上: 多出四个 slave node

    接下来对slave node 进行初始化

    $PGXC init coordinator slave coord1

    Initialize coordinator slave coord1
    pg_basebackup: could not connect to server: FATAL: no pg_hba.conf entry for replication connection from host "*.*.*.*", user "postgres"

    解决方法(参见postgres 数据库主从配置) http://www.cnblogs.com/yjf512/p/4499547.html

    修改 coordinator master coord1 节点 

    pg_hba.conf 文件 加入 

          host    replication     all     0.0.0.0/0                 trust

    postgresql.conf 文件修改以下参数

    wal_level = hot_standby

    max_wal_senders = 5 不能大于 最大连接数

    wal_keep_segments = 

    max_connections = 

    重启 主节点 

    初始化 从节点

    启动 从节点

    --------------------------------------------------------------------------------成功----------------------------------------------

    PGXC monitor all
    Running: gtm master
    Running: gtm slave
    Running: gtm proxy gtm_pxy1
    Running: gtm proxy gtm_pxy2
    Running: coordinator master coord1
    Running: coordinator slave coord1
    Running: coordinator master coord2
    Running: coordinator slave coord2
    Running: datanode master datanode_1
    Running: datanode slave datanode_1
    Running: datanode master datanode_2
    Running: datanode slave datanode_2

     ---------------------------------------------------------------------------验证--------------------------------------

    [postgres@node1 ~]$ psql -h node3
    psql (PGXL 9.5r1beta1, based on PG 9.5.0 (Postgres-XL 9.5r1beta1))
    Type "help" for help.

    postgres=# select * from pgxc_node;
    node_name | node_type | node_port | node_host | nodeis_primary | nodeis_preferred | node_id
    ------------+-----------+-----------+-----------+----------------+------------------+-------------
    coord1 | C | 5432 | node3 | f | f | 1885696643
    coord2 | C | 5432 | node4 | f | f | -1197102633
    datanode_1 | D | 15432 | node3 | t | t | -675012441
    datanode_2 | D | 15432 | node4 | f | f | -1047623914
    (4 rows)

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  • 原文地址:https://www.cnblogs.com/zhangeamon/p/5262180.html
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