一 、测试环境概述

1. 机器配置

• 配置截图                                                                   

• 两台华为云ECS，kc1.xlarge.4，规格4c/16g，openEuler 20.03系统。

二、安装openGauss

详情请见openGauss官网：https://opengauss.org/zh/

三 、修改内网地址

1. 修改ECS IP

• 修改IP前要解绑NAT，关闭服务器。                         

• 修改IP                                                               

• 另一台同样操作                                                          

2. 开机

3. 恢复NAT

四、数据库端操作

1. 直接启动数据库

• 发现报错

  [omm@ecs-0001 ~]$ gs_om -t start
  Starting cluster.
  ========================================= 
  [GAUSS-51400] : Failed to execute the command: scp ecs-0002:/appdata/app/opengauss_f892ccb7/bin/cluster_dynamic_config /appdata/app/opengauss_f892ccb7/bin/cluster_dynamic_config_ecs-0002. Error:
  ssh: connect to host ecs-0002 port 22: No route to host

2. 修改配置文件

• postgresql.conf

• pg_hba.conf

• clusterconfig.xml （用于生成static configuration）

• /etc/hosts

[root@ecs-0001 ~]# sed -i 's/192.168.0.10/192.168.0.30/g' /appdata/data/postgresql.conf /appdata/data/pg_hba.conf /opt/software/opengauss/clusterconfig.xml /etc/hosts
[root@ecs-0001 ~]# sed -i 's/192.168.0.20/192.168.0.40/g' /appdata/data/postgresql.conf /appdata/data/pg_hba.conf /opt/software/opengauss/clusterconfig.xml /etc/hosts
[root@ecs-0002 ~]# sed -i 's/192.168.0.10/192.168.0.30/g' /appdata/data/postgresql.conf /appdata/data/pg_hba.conf /opt/software/opengauss/clusterconfig.xml /etc/hosts
[root@ecs-0002 ~]# sed -i 's/192.168.0.20/192.168.0.40/g' /appdata/data/postgresql.conf /appdata/data/pg_hba.conf /opt/software/opengauss/clusterconfig.xml /etc/hosts

3. 生成集群文件并发送到备库

• 自动发送到备库

  [omm@ecs-0001 ~]$ gs_om -t generateconf -X /opt/software/opengauss/clusterconfig.xml --distribute
  Generating static configuration files for all nodes.
  Creating temp directory to store static configuration files.
  Successfully created the temp directory.
  Generating static configuration files.
  Successfully generated static configuration files.
  Static configuration files for all nodes are saved in /appdata/app/tools/script/static_config_files.
  Distributing static configuration files to all nodes.
  Successfully distributed static configuration files.

4. 启动数据库验证

• 主库启动

  [omm@ecs-0001 ~]$ gs_om -t start
  Starting cluster.
  =========================================
  [SUCCESS] ecs-0001
  2022-01-20 12:45:15.721 [unknown] [unknown] localhost 281457640472592 0 0 [BACKEND] WARNING:  Failed to initialize the memory protect for g_instance.attr.attr_storage.cstore_buffers (16 Mbytes) or shared memory (8004 Mbytes) is larger.
  [SUCCESS] ecs-0002
  2022-01-20 12:45:18.071 [unknown] [unknown] localhost 281465901482000 0 0 [BACKEND] WARNING:  Failed to initialize the memory protect for g_instance.attr.attr_storage.cstore_buffers (16 Mbytes) or shared memory (8004 Mbytes) is larger.
  =========================================
  Successfully started.

• 备库查看状态

  [omm@ecs-0002 ~]$ gs_om -t status --all
  -----------------------------------------------------------------------
  
  cluster_state             : Normal
  redistributing            : No
  
  -----------------------------------------------------------------------
  
  node                      : 1
  node_name                 : ecs-0001
  instance_id               : 6001
  node_ip                   : 192.168.0.30
  data_path                 : /appdata/data
  type                      : Datanode
  instance_state            : Normal
  az_name                   : AZ1
  static_connections        : 1
  HA_state                  : Normal
  instance_role             : Primary
  
  -----------------------------------------------------------------------
  
  node                      : 2
  node_name                 : ecs-0002
  instance_id               : 6002
  node_ip                   : 192.168.0.40
  data_path                 : /appdata/data
  type                      : Datanode
  instance_state            : Normal
  az_name                   : AZ1
  instance_role             : Standby
  HA_state                  : Streaming
  sender_sent_location      : 0/452D3E8
  sender_write_location     : 0/452D3E8
  sender_flush_location     : 0/452D3E8
  sender_replay_location    : 0/452D3E8
  receiver_received_location: 0/452D3E8
  receiver_write_location   : 0/452D3E8
  receiver_flush_location   : 0/452D3E8
  receiver_replay_location  : 0/452D3E8
  sync_percent              : 100%
  sync_state                : Sync
  
  -----------------------------------------------------------------------