在Docker中快速体验openGauss主备环境数据库

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小麦苗DB宝 发表于 2022/01/07 14:36:05 2022/01/07
【摘要】 参考：https://hub.docker.com/r/enmotech/opengauss 创建主从复制的openGauss容器拉取容器镜像运行脚本create_master_slave.sh，按照提示输入所需参数，或者直接使用默认值，即可自动创建openGauss一主一备架构的两个容器。上述脚本有多个自定义参数，以下为这些参数的参数名称(解释)[默认值]。OG_SUBNET (容器所在网...

参考：

https://hub.docker.com/r/enmotech/opengauss

创建主从复制的openGauss容器

  1. 拉取容器镜像
  2. 运行脚本create_master_slave.sh，按照提示输入所需参数，或者直接使用默认值，即可自动创建openGauss一主一备架构的两个容器。

上述脚本有多个自定义参数，以下为这些参数的参数名称(解释)[默认值]。

OG_SUBNET (容器所在网段) [172.11.0.0/24]
GS_PASSWORD (定义数据库密码)[Enmo@123]
MASTER_IP (主库IP)[172.11.0.101]
SLAVE_1_IP (备库IP)[172.11.0.102]
MASTER_HOST_PORT (主库数据库服务端口)[5432]
MASTER_LOCAL_PORT (主库通信端口)[5434]
SLAVE_1_HOST_PORT (备库数据库服务端口)[6432]
SLAVE_1_LOCAL_PORT (备库通信端口)[6434]
MASTER_NODENAME (主节点名称)[opengauss_master]
SLAVE_NODENAME （备节点名称）[opengauss_slave1]

使用示例

拉取镜像

docker pull enmotech/opengauss:latest

获取创建主备容器脚本并运行

wget https://raw.githubusercontent.com/enmotech/enmotech-docker-opengauss/master/create_master_slave.sh
chmod +x create_master_slave.sh 

docker network rm opengaussnetwork


# 全部回车默认，最后版本的地方输入 latest

[root@docker35 ~]# chmod +x create_master_slave.sh
[root@docker35 ~]# ./create_master_slave.sh 
Please input OG_SUBNET (容器所在网段) [172.11.0.0/24]: 
OG_SUBNET set 172.11.0.0/24
Please input GS_PASSWORD (定义数据库密码)[Enmo@123]: 
GS_PASSWORD set Enmo@123
Please input MASTER_IP (主库IP)[172.11.0.101]: 
MASTER_IP set 172.11.0.101
Please input SLAVE_1_IP (备库IP)[172.11.0.102]: 
SLAVE_1_IP set 172.11.0.102
Please input MASTER_HOST_PORT (主库数据库服务端口)[5432]: 
MASTER_HOST_PORT set 5432
Please input MASTER_LOCAL_PORT (主库通信端口)[5434]: 
MASTER_LOCAL_PORT set 5434
Please input SLAVE_1_HOST_PORT (备库数据库服务端口)[6432]: 
SLAVE_1_HOST_PORT set 6432
Please input SLAVE_1_LOCAL_PORT (备库通信端口)[6434]: 
SLAVE_1_LOCAL_PORT set 6434
Please input MASTER_NODENAME [opengauss_master]: 
MASTER_NODENAME set opengauss_master
Please input SLAVE_NODENAME [opengauss_slave1]: 
SLAVE_NODENAME set opengauss_slave1
Please input openGauss VERSION [1.1.0]: latest
openGauss VERSION set latest
starting  
cf57b86811530658bafb592d3427bd0058a590bcbf9169607d2f83446c3b1a83
OpenGauss Database Network Created.
2d78115504cf26d5074d0a85112f34425531abcbd26c099b40f4f480c73f351a
OpenGauss Database Master Docker Container created.
1a485df6d6a885cb427262727560509148f5fb3744dc58f358f6968b391be4e1
OpenGauss Database Slave1 Docker Container created.

验证主备状态

主库

# docker exec -it opengauss_master /bin/bash
# su - omm
omm@opengauss_master:~$ gs_ctl status -D /var/lib/opengauss/data/
[2022-01-07 04:09:26.656][354][][gs_ctl]: gs_ctl status,datadir is /var/lib/opengauss/data 
gs_ctl: server is running (PID: 1)
/usr/local/opengauss/bin/gaussdb "-M" "primary"

omm@opengauss_master:~$ gs_ctl query -D /var/lib/opengauss/data/
[2022-01-07 04:09:43.897][358][][gs_ctl]: gs_ctl query ,datadir is /var/lib/opengauss/data 
 HA state:           
        local_role                     : Primary
        static_connections             : 1
        db_state                       : Normal
        detail_information             : Normal

 Senders info:       
        sender_pid                     : 345
        local_role                     : Primary
        peer_role                      : Standby
        peer_state                     : Normal
        state                          : Streaming
        sender_sent_location           : 0/4000268
        sender_write_location          : 0/4000268
        sender_flush_location          : 0/4000268
        sender_replay_location         : 0/4000268
        receiver_received_location     : 0/4000268
        receiver_write_location        : 0/4000268
        receiver_flush_location        : 0/4000268
        receiver_replay_location       : 0/4000268
        sync_percent                   : 100%
        sync_state                     : Sync
        sync_priority                  : 1
        sync_most_available            : On
        channel                        : 172.11.0.101:5434-->172.11.0.102:49112

 Receiver info:      
No information

备库


# docker exec -it opengauss_slave1 /bin/bash
# su - omm

omm@opengauss_slave1:/var/lib/opengauss/data$ gs_ctl status -D /var/lib/opengauss/data/
[2022-01-07 04:08:49.365][365][][gs_ctl]: gs_ctl status,datadir is /var/lib/opengauss/data 
gs_ctl: server is running (PID: 1)
/usr/local/opengauss/bin/gaussdb "-M" "standby"


omm@opengauss_slave1:~$ 
omm@opengauss_slave1:~$ gs_ctl query -D /var/lib/opengauss/data/
[2022-01-07 04:10:29.842][374][][gs_ctl]: gs_ctl query ,datadir is /var/lib/opengauss/data 
 HA state:           
        local_role                     : Standby
        static_connections             : 1
        db_state                       : Normal
        detail_information             : Normal

 Senders info:       
No information 
 Receiver info:      
        receiver_pid                   : 360
        local_role                     : Standby
        peer_role                      : Primary
        peer_state                     : Normal
        state                          : Normal
        sender_sent_location           : 0/4000268
        sender_write_location          : 0/4000268
        sender_flush_location          : 0/4000268
        sender_replay_location         : 0/4000268
        receiver_received_location     : 0/4000268
        receiver_write_location        : 0/4000268
        receiver_flush_location        : 0/4000268
        receiver_replay_location       : 0/4000268
        sync_percent                   : 100%
        channel                        : 172.11.0.102:49112<--172.11.0.101:5434

配置远程访问

alter system set password_policy=0;

create user lhr with password 'lhr' sysadmin ;
grant all PRIVILEGES to lhr; 

psql -d postgres -U lhr  -h 192.168.66.35 -p5432
psql -d postgres -U lhr  -h 192.168.66.35 -p6432


C:\Users\lhrxxt>psql -d postgres -U lhr  -h 192.168.66.35 -p5432
Password for user lhr:
psql (14.0, server 9.2.4)
Type "help" for help.

postgres=> \l
                              List of databases
   Name    | Owner | Encoding |   Collate   |    Ctype    | Access privileges
-----------+-------+----------+-------------+-------------+-------------------
 omm       | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 postgres  | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 template0 | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/omm           +
           |       |          |             |             | omm=CTc/omm
 template1 | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/omm           +
           |       |          |             |             | omm=CTc/omm
(4 rows)

主从切换

主从Switchover切换

在备机做切换：

omm@opengauss_slave1:~$  gs_ctl switchover -D /var/lib/opengauss/data/
[2022-01-07 04:16:30.442][389][][gs_ctl]: gs_ctl switchover ,datadir is /var/lib/opengauss/data 
[2022-01-07 04:16:30.442][389][][gs_ctl]: switchover term (1)
[2022-01-07 04:16:30.454][389][][gs_ctl]: waiting for server to switchover.................
[2022-01-07 04:16:44.682][389][][gs_ctl]: done
[2022-01-07 04:16:44.682][389][][gs_ctl]: switchover completed (/var/lib/opengauss/data)
omm@opengauss_slave1:~$ 
omm@opengauss_slave1:~$ 
omm@opengauss_slave1:~$ gs_ctl query -D /var/lib/opengauss/data/
[2022-01-07 04:16:51.025][422][][gs_ctl]: gs_ctl query ,datadir is /var/lib/opengauss/data 
 HA state:           
        local_role                     : Primary
        static_connections             : 1
        db_state                       : Normal
        detail_information             : Normal

 Senders info:       
        sender_pid                     : 417
        local_role                     : Primary
        peer_role                      : Standby
        peer_state                     : Normal
        state                          : Streaming
        sender_sent_location           : 0/40017B8
        sender_write_location          : 0/40017B8
        sender_flush_location          : 0/40017B8
        sender_replay_location         : 0/40017B8
        receiver_received_location     : 0/40017B8
        receiver_write_location        : 0/40017B8
        receiver_flush_location        : 0/40017B8
        receiver_replay_location       : 0/40017B8
        sync_percent                   : 100%
        sync_state                     : Sync
        sync_priority                  : 1
        sync_most_available            : On
        channel                        : 172.11.0.102:6434-->172.11.0.101:51326

 Receiver info:      
No information 

omm@opengauss_master:~$ gs_ctl query -D /var/lib/opengauss/data/
[2022-01-07 04:17:11.064][421][][gs_ctl]: gs_ctl query ,datadir is /var/lib/opengauss/data 
 HA state:           
        local_role                     : Standby
        static_connections             : 1
        db_state                       : Normal
        detail_information             : Normal

 Senders info:       
No information 
 Receiver info:      
        receiver_pid                   : 420
        local_role                     : Standby
        peer_role                      : Primary
        peer_state                     : Normal
        state                          : Normal
        sender_sent_location           : 0/40017B8
        sender_write_location          : 0/40017B8
        sender_flush_location          : 0/40017B8
        sender_replay_location         : 0/40017B8
        receiver_received_location     : 0/40017B8
        receiver_write_location        : 0/40017B8
        receiver_flush_location        : 0/40017B8
        receiver_replay_location       : 0/40017B8
        sync_percent                   : 100%
        channel                        : 172.11.0.101:51326<--172.11.0.102:6434

主从Failover切换

在备机操作：

omm@opengauss_master:~$ gs_ctl failover -D /var/lib/opengauss/data/
[2022-01-07 04:18:03.280][426][][gs_ctl]: gs_ctl failover ,datadir is /var/lib/opengauss/data 
[2022-01-07 04:18:03.280][426][][gs_ctl]: failover term (1)
[2022-01-07 04:18:03.293][426][][gs_ctl]:  waiting for server to failover...
.[2022-01-07 04:18:04.311][426][][gs_ctl]:  done
[2022-01-07 04:18:04.311][426][][gs_ctl]:  failover completed (/var/lib/opengauss/data)
omm@opengauss_master:~$ gs_ctl query -D /var/lib/opengauss/data/   
[2022-01-07 04:18:08.197][445][][gs_ctl]: gs_ctl query ,datadir is /var/lib/opengauss/data 
 HA state:           
        local_role                     : Primary
        static_connections             : 1
        db_state                       : Normal
        detail_information             : Normal

 Senders info:       
No information 
 Receiver info:      
No information 

omm@opengauss_slave1:~$ gs_ctl query -D /var/lib/opengauss/data/
[2022-01-07 04:18:26.231][431][][gs_ctl]: gs_ctl query ,datadir is /var/lib/opengauss/data 
 HA state:           
        local_role                     : Primary
        static_connections             : 1
        db_state                       : Normal
        detail_information             : Normal

 Senders info:       
No information 
 Receiver info:      
No information

可见，现在为2个主库，重启“slave1”之后，“slave1”为standby，对于“slave1”应该为备库，状态为“Need repair”，所以，这里只能重建：

gs_ctl restart -D /var/lib/opengauss/data -M standby

omm@opengauss_slave1:~$ gs_ctl query -D /var/lib/opengauss/data/
[2022-01-07 04:20:29.775][218][][gs_ctl]: gs_ctl query ,datadir is /var/lib/opengauss/data 
 HA state:           
        local_role                     : Standby
        static_connections             : 1
        db_state                       : Need repair
        detail_information             : WAL segment removed

 Senders info:       
No information 
 Receiver info:      
No information 


-- 重新构建主备关系
gs_ctl build -D /var/lib/opengauss/data -b full -M standby

但是，由于是docker环境，所以，该命令不能执行，更多过程可以参考：安装openGauss极简版单节点和一主一备节点环境：https://www.xmmup.com/anzhuangopengaussjijianbandanjiedianheyizhuyibeijiedianhuanjing.html 有详细的切换流程。

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