【参赛作品66】快速搭建一套openGauss主备高可用集群

作者:Sally

openGauss是一款开源关系型数据库管理系统,采用木兰宽松许可证v2发行。openGauss内核早期源自PostgreSQL,深度融合华为在数据库领域多年的经验,结合企业级场景需求,持续构建竞争力特性。同时openGauss也是一个开源、免费的数据库平台,鼓励社区贡献、合作。

今天无意看到恩墨开源团队发布了openGauss新的容器镜像,此版本镜像还支持创建主从复制的openGauss高可用集群。

本篇文件记录快速部署的主从复制的openGauss高可用集群的过程以及中间遇到的问题,希望对学习openGauss的同学有所帮助。
参考dockerhub网址:https://hub.docker.com/r/enmotech/opengauss

基础环境准备

[[email protected] ~]# cat /etc/system-release
Oracle Linux Server release 7.9
[[email protected] ~]# docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.5.1-docker)
  scan: Docker Scan (Docker Inc., v0.8.0)

Server:
 Containers: 48
  Running: 0
  Paused: 0
  Stopped: 48
 Images: 18
 Server Version: 20.10.7
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Native Overlay Diff: false
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: d71fcd7d8303cbf684402823e425e9dd2e99285d
 runc version: b9ee9c6314599f1b4a7f497e1f1f856fe433d3b7
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 5.4.17-2102.201.3.el7uek.x86_64
 Operating System: Oracle Linux Server 7.9
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 4.268GiB
 Name: hhj
 ID: HHHZ:DPVB:WA2L:J5BI:D4Q6:YMH4:NQEQ:WS4M:A6KP:R3JC:L6EW:LS6V
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  192.168.56.102:5000
  127.0.0.0/8
 Registry Mirrors:
  https://1nj0zren.mirror.aliyuncs.com/
  https://docker.mirrors.ustc.edu.cn/
  http://f1361db2.m.daocloud.io/
  https://registry.docker-cn.com/
 Live Restore Enabled: false

快速拉取openGauss最新镜像

[[email protected] ~]# docker pull enmotech/opengauss:latest
latest: Pulling from enmotech/opengauss
Digest: sha256:d5a3e38fa2553a44e7fa1cd5cad0b4f0845a679858764067d7b0052a228578a0
Status: Image is up to date for enmotech/opengauss:latest
docker.io/enmotech/opengauss:latest

修改openGauss的镜像标签

注意:不修改标签在启动容器时会报找不到镜像

[[email protected] ~]# docker tag enmotech/opengauss:latest opengauss:latest 
[[email protected] ~]# docker images
REPOSITORY                                                        TAG        IMAGE ID       CREATED         SIZE
enmotech/opengauss                                                latest     b4dd24d09223   2 months ago    383MB
opengauss                                                         latest     b4dd24d09223   2 months ago    383MB

获取创建主备容器脚本并运行

[[email protected] ~]# # wget https://raw.githubusercontent.com/enmotech/enmotech-docker-opengauss/master/create_master_slave.sh
[[email protected] ~]## chmod +x create_master_slave.sh
[[email protected] ~]# ./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)[[email protected]]:
GS_PASSWORD set [email protected]
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 [1.0.1]: latest
openGauss VERSION set latest
starting
13b4cf3a545cdc51539b2f4e6b227536cacd5caa764a167701927d7a6cbd21e5
OpenGauss Database Network Created.
85c9894a167ca992c237900bb27ed50c8ffb323217de6c1011614f5a67f8dcd6
OpenGauss Database Master Docker Container created.
e3fbdd36d6203a34051eea9d6a756d404528a0dcdca169aa2be42502a45d3087
OpenGauss Database Slave1 Docker Container created.

注意如果遇到容器存在或者网络存在可以如下删除

[roo[email protected] ~]# docker rm opengauss_master
opengauss_master
[[email protected] ~]# docker network rm opengaussnetwork
opengaussnetwork

验证openGauss主备集群状态

查看容器启动情况

[[email protected] ~]# docker ps
CONTAINER ID   IMAGE              COMMAND                  CREATED          STATUS          PORTS                                                 NAMES
e3fbdd36d620   opengauss:latest   "entrypoint.sh -M st…"   13 seconds ago   Up 12 seconds   5432/tcp, 0.0.0.0:6432->6432/tcp, :::6432->6432/tcp   opengauss_slave1
85c9894a167c   opengauss:latest   "entrypoint.sh -M pr…"   46 seconds ago   Up 43 seconds   0.0.0.0:5432->5432/tcp, :::5432->5432/tcp             opengauss_master

进入openGauss主库

[[email protected] ~]# docker exec -it opengauss_master bash
[email protected]_master:/# su - omm
[email protected]_master:~$ gsql
gsql ((openGauss 2.1.0 build 590b0f8e) compiled at 2021-09-30 14:29:04 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# 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)

omm=# q

检查主从情况

[2021-12-19 04:29:35.624][350][][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                     : 320
        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-->172.11.0.102:38096

 Receiver info:
No information
[email protected]_master:~$
[email protected]_master:~$ exit
logout
[email protected]_master:/# exit
exit

进入openGauss从库

[email protected]_slave1:/# su - omm
[email protected]_slave1:~$ gsql -r -p6432
gsql ((openGauss 2.1.0 build 590b0f8e) compiled at 2021-09-30 14:29:04 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# 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)

omm=# q

检查主从情况

[email protected]_slave1:~$  gs_ctl query -D /var/lib/opengauss/data/
[2021-12-19 04:31:24.788][361][][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                   : 338
        local_role                     : Standby
        peer_role                      : Primary
        peer_state                     : Normal
        state                          : Normal
        sender_sent_location           : 0/40004A8
        sender_write_location          : 0/40004A8
        sender_flush_location          : 0/40004A8
        sender_replay_location         : 0/40004A8
        receiver_received_location     : 0/40004A8
        receiver_write_location        : 0/40004A8
        receiver_flush_location        : 0/40004A8
        receiver_replay_location       : 0/40004A8
        sync_percent                   : 100%
        channel                        : 172.11.0.102:38096<--172.11.0.101:5434

[email protected]_slave1:~$ exit
logout
[email protected]_slave1:/# exit
exit
[[email protected] ~]# docker ps
CONTAINER ID   IMAGE              COMMAND                  CREATED         STATUS         PORTS                                                 NAMES
e3fbdd36d620   opengauss:latest   "entrypoint.sh -M st…"   8 minutes ago   Up 8 minutes   5432/tcp, 0.0.0.0:6432->6432/tcp, :::6432->6432/tcp   opengauss_slave1
85c9894a167c   opengauss:latest   "entrypoint.sh -M pr…"   9 minutes ago   Up 9 minutes   0.0.0.0:5432->5432/tcp, :::5432->5432/tcp             opengauss_master

验证openGauss主备集群主从同步

进入主库创建表和插入数据

[[email protected] ~]# docker exec -it opengauss_master bash
[email protected]_master:/# su - omm
[email protected]_master:~$ gsql -r
gsql ((openGauss 2.1.0 build 590b0f8e) compiled at 2021-09-30 14:29:04 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm= create table test(id int);
CREATE TABLE
omm=# insert into test values(1);
INSERT 0 1
omm=# insert into test values(2);
INSERT 0 1

omm=# select * from test;
 id
----
  1
  2
(2 rows)

omm=# exit
omm-# q
[email protected]_master:~$ exit
logout
[email protected]_master:/# exit
exit

进入从库验证数据同步

[[email protected] ~]# docker exec -it opengauss_slave1 bash
[email protected]_slave1:/# su - omm
[email protected]_slave1:~$ gsql -r -p 6432
gsql ((openGauss 2.1.0 build 590b0f8e) compiled at 2021-09-30 14:29:04 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# d
                        List of relations
 Schema | Name | Type  | Owner |             Storage
--------+------+-------+-------+----------------------------------
 public | test | table | omm   | {orientation=row,compression=no}
(1 row)
omm=# select * from test;
 id
----
  1
  2
(2 rows)

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