实验1：通过Docker安装部署OceanBase

练习内容
（必选）下载Docker 镜像：OceanBase 官方社区版镜像 55 。
（必选）使用 OBD 命令完成后续的 OceanBase 集群部署。
（必选）创建一个业务租户、一个业务数据库，以及一些表等。

备注：第一次尝试使用docker安装OB，文章为个人测试过程记录以及个人理解，不一定正确，仅供参考。

安装前准备

主机配置

主机名	ip	配置
competet-oecanbase	192.179.4.212	16C/64G/1.5T

安装docker环境

yum源已配置好，直接yum安装docker即可

yum -y install docker

启动docker服务，并设置成开机自启

[root@competet-oecanbase ~]# systemctl start docker
[root@competet-oecanbase ~]# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@competet-oecanbase ~]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2022-10-20 18:38:54 CST; 13s ago
     Docs: http://docs.docker.com
 Main PID: 25543 (dockerd-current)
   CGroup: /system.slice/docker.service
           ├─25543 /usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --exec-opt native.cgroupdriver=systemd --userland-proxy-path=/usr/libexe...
           └─25555 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --...

Oct 20 18:38:53 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:53.022843318+08:00" level=info msg="libcontainerd: new containerd process, pid: 25555"
Oct 20 18:38:54 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:54.186819391+08:00" level=info msg="Graph migration to content-addressability took 0.00 seconds"
Oct 20 18:38:54 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:54.189190091+08:00" level=info msg="Loading containers: start."
Oct 20 18:38:54 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:54.328850676+08:00" level=info msg="Firewalld running: false"
Oct 20 18:38:54 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:54.444808707+08:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon opt...d IP address"
Oct 20 18:38:54 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:54.505595365+08:00" level=info msg="Loading containers: done."
Oct 20 18:38:54 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:54.540217754+08:00" level=info msg="Daemon has completed initialization"
Oct 20 18:38:54 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:54.540288579+08:00" level=info msg="Docker daemon" commit="7d71120/1.13.1" graphdriver=overlay2 version=1.13.1
Oct 20 18:38:54 competet-oecanbase dockerd-current[25543]: time="2022-10-20T18:38:54.552340619+08:00" level=info msg="API listen on /var/run/docker.sock"
Oct 20 18:38:54 competet-oecanbase systemd[1]: Started Docker Application Container Engine.
Hint: Some lines were ellipsized, use -l to show in full.

安装OceanBase

参考:https://www.oceanbase.com/docs/community-observer-cn-10000000000096600

[root@competet-oecanbase ~]# docker run -p 2881:2881 --name oceanbase-ce -d oceanbase/oceanbase-ce
[root@competet-oecanbase ~]# docker ps 
CONTAINER ID        IMAGE                    COMMAND              CREATED             STATUS              PORTS                    NAMES
769a593e1351        oceanbase/oceanbase-ce   "/bin/sh -c _boot"   3 minutes ago       Up 2 minutes        0.0.0.0:2881->2881/tcp   oceanbase-ce
[root@competet-oecanbase ~]# docker images 
REPOSITORY                         TAG                 IMAGE ID            CREATED             SIZE
docker.io/oceanbase/oceanbase-ce   latest              4af946862346        3 months ago        558 MB
[root@competet-oecanbase ~]#  docker logs oceanbase-ce |tail -1
boot success!

可能会用到的命令：

docker stop `docker ps -a -q`
docker rm `docker ps -a -q`
docker rmi `docker images -q`

下面的命令只用执行一个即可。
按照文档的描述，因为会创建一个test租户，这里会把给sys租户的资源除去之后剩下的资源都给到test租户。
如果选择mini应该是有另外一个小一点的资源规格，有机会再尝试。

连接OceanBase

#进入容器
[root@competet-oecanbase ~]# docker exec -it  oceanbase-ce bash 
#查看集群状态
[root@16073e6d087d ~]# obd cluster list
+------------------------------------------------------------+
|                        Cluster List                        |
+-----------+------------------------------+-----------------+
| Name      | Configuration Path           | Status (Cached) |
+-----------+------------------------------+-----------------+
| obcluster | /root/.obd/cluster/obcluster | running         |
+-----------+------------------------------+-----------------+

这个地方也是疑惑了很久，因为练习要求说安装完docker使用obd完成后面的集群部署，此时集群已经是running状态，代表集群已经部署完成且跑起来了。查询一些文档之后，怀疑应该是镜像不同的问题。

既然集群已经成功启动，接下来就创建租户、数据库和表。

创建租户

在容器内使用obclient客户端连接实例

[root@16073e6d087d ~]# obclient -h127.0.0.1 -u root -P 2881
Welcome to the OceanBase.  Commands end with ; or \g.
Your OceanBase connection id is 3221487675
Server version: 5.7.25 OceanBase 3.1.4 (r10000092022071511-b4bfa011ceaef428782dcb65ae89190c40b78c2f) (Built Jul 15 2022 11:45:14)

Copyright (c) 2000, 2022, OceanBase and/or its affiliates. All rights reserved.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

obclient [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| oceanbase          |
| information_schema |
| mysql              |
| SYS                |
| LBACSYS            |
| ORAAUDITOR         |
| test               |
+--------------------+
7 rows in set (0.004 sec)

obclient [(none)]> use oceanbase;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
obclient [oceanbase]> select * from gv$tenant;
+-----------+-------------+-----------+--------------+----------------+---------------+-----------+---------------+
| tenant_id | tenant_name | zone_list | primary_zone | collation_type | info          | read_only | locality      |
+-----------+-------------+-----------+--------------+----------------+---------------+-----------+---------------+
|         1 | sys         | zone1     | zone1        |              0 | system tenant |         0 | FULL{1}@zone1 |
|      1001 | test        | zone1     | RANDOM       |              0 |               |         0 | FULL{1}@zone1 |
+-----------+-------------+-----------+--------------+----------------+---------------+-----------+---------------+
2 rows in set (0.003 sec)

通过视图gv$tenant可以看到，除了sys租户默认已经创建了一个test租户，并且资源已经分配完了。

obclient [oceanbase]> select * from gv$unit;
+---------+----------------+------------------+------------------+--------------------+-------+-----------+-------------+-----------+----------+---------------------+-----------------------+---------+---------+-------------+-------------+----------+----------+---------------+---------------------+
| unit_id | unit_config_id | unit_config_name | resource_pool_id | resource_pool_name | zone  | tenant_id | tenant_name | svr_ip    | svr_port | migrate_from_svr_ip | migrate_from_svr_port | max_cpu | min_cpu | max_memory  | min_memory  | max_iops | min_iops | max_disk_size | max_session_num     |
+---------+----------------+------------------+------------------+--------------------+-------+-----------+-------------+-----------+----------+---------------------+-----------------------+---------+---------+-------------+-------------+----------+----------+---------------+---------------------+
|       1 |              1 | sys_unit_config  |                1 | sys_pool           | zone1 |         1 | sys         | 127.0.0.1 |     2882 |                     |                     0 |       5 |     2.5 |  8697308774 |  7247757312 |    10000 |     5000 |   10737418240 | 9223372036854775807 |
|    1001 |           1001 | test_unit        |             1001 | test_pool          | zone1 |      1001 | test        | 127.0.0.1 |     2882 |                     |                     0 |      11 |      11 | 20293720474 | 20293720474 |      128 |      128 |   10737418240 |                  64 |
+---------+----------------+------------------+------------------+--------------------+-------+-----------+-------------+-----------+----------+---------------------+-----------------------+---------+---------+-------------+-------------+----------+----------+---------------+---------------------+
2 rows in set (0.016 sec)

注意：一个资源池只能分配给一个租户，这里本来尝试把test_pool直接给mysql用的，发现不行。

为了熟悉步骤，遂删除test租户和对应资源，然后创建自己需要的obmysql租户和资源池。

#记得要使用force，不然无法删除资源池
obclient [oceanbase]> drop tenant test force;
Query OK, 0 rows affected (0.035 sec)

obclient [oceanbase]> drop resource pool test_pool;
Query OK, 0 rows affected (0.008 sec)

obclient [oceanbase]> drop resource unit test_unit;
Query OK, 0 rows affected (0.005 sec)

obclient [oceanbase]> CREATE resource unit mysql_unit max_cpu=4, min_cpu=4, max_memory='16G', min_memory='16G', max_iops=10000, min_iops=1000, max_session_num=1000000, max_disk_size='400G'; 
Query OK, 0 rows affected (0.010 sec)

obclient [oceanbase]> CREATE resource pool my_pool unit = 'mysql_unit', unit_num = 1;
Query OK, 0 rows affected (0.011 sec)

obclient [oceanbase]> create tenant obmysql resource_pool_list=('my_pool'), primary_zone='zone1',comment 'mysql tenant/instance', charset='utf8' set ob_tcp_invited_nodes='%', ob_compatibility_mode='mysql';
Query OK, 0 rows affected (0.912 sec)

在obmysql租户下创建数据库db01及测试表course，插入几笔数据。

obclient [(none)]> create database db01;
Query OK, 1 row affected (0.025 sec)

obclient [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| oceanbase          |
| information_schema |
| mysql              |
| test               |
| db01               |
+--------------------+
5 rows in set (0.003 sec)

obclient [(none)]> use db01;
Database changed
obclient [db01]> CREATE TABLE course (
    -> cno varchar(5) NOT NULL,
    -> cname varchar(50) NOT NULL,
    -> tno char(3) NOT NULL,
    -> PRIMARY KEY (cno)
    -> );
Query OK, 0 rows affected (0.089 sec)

obclient [db01]> show tables;
+----------------+
| Tables_in_db01 |
+----------------+
| course         |
+----------------+
1 row in set (0.002 sec)

obclient [db01]> INSERT INTO course VALUES ('3001','C语言实践','801');
Query OK, 1 row affected (0.009 sec)

obclient [db01]> INSERT INTO course VALUES ('3002','高等数学','802');
Query OK, 1 row affected (0.001 sec)

obclient [db01]> INSERT INTO course VALUES ('3003','数学分析','803');
Query OK, 1 row affected (0.002 sec)

obclient [db01]> INSERT INTO course VALUES ('3004','数据库原理','804');
Query OK, 1 row affected (0.001 sec)

obclient [db01]> INSERT INTO course VALUES ('3005','离散数学','805');
Query OK, 1 row affected (0.002 sec)

obclient [db01]> INSERT INTO course VALUES ('3006','大学英语','806');
Query OK, 1 row affected (0.001 sec)

obclient [db01]> INSERT INTO course VALUES ('3007','线性代数','807');
Query OK, 1 row affected (0.002 sec)

obclient [db01]> select * from course;
+------+-----------------+-----+
| cno  | cname           | tno |
+------+-----------------+-----+
| 3001 | C语言实践   | 801 |
| 3002 | 高等数学    | 802 |
| 3003 | 数学分析    | 803 |
| 3004 | 数据库原理 | 804 |
| 3005 | 离散数学    | 805 |
| 3006 | 大学英语    | 806 |
| 3007 | 线性代数    | 807 |
+------+-----------------+-----+
7 rows in set (0.002 sec)

测试感受：整体感觉使用docker安装OB是很简单方便的。如果对OB的架构和租户概念有一定了解，会更容易上手。