Deploy a three-replica OceanBase cluster by using the CLI

This topic describes how to deploy a three-replica OceanBase cluster by using the CLI.

Prerequisites

Before you install OceanBase Database, make sure that:

• The OBServer node has been configured. For more information, see Configure servers, (Optional) Configure the clock source, and Initialize an OBServer node by using oatcli.

• You have obtained the RPM package of OceanBase Database. For more information, see Prepare installation packages.

Procedure

Step 1: Install the RPM package

1. Install the RPM package for OceanBase Database.

   Here, $rpm_dir specifies the directory in which the RPM package is stored, and $rpm_name specifies the name of the RPM package.

   [root@xxx /]# cd $rpm_dir
   [root@xxx $rpm_dir]# rpm -ivh $rpm_name
   

   Note

   By default, OceanBase Database is installed in the /home/admin/oceanbase directory.

   Here is an example:

   [root@xxx /home/admin/rpm]# rpm -ivh oceanbase-4.2.0.0-100000052023073123.el7.x86_64.rpm
   Preparing...                          ################################# [100%]
   Updating / installing...
      1:oceanbase-4.2.0.0-100000052023073################################# [100%]
   

2. (Optional) Install OceanBase Client (OBClient).

   OBClient is a CLI tool dedicated to OceanBase Database. You can use it to connect to MySQL tenants and Oracle tenants of OceanBase Database. If you only need to connect to a MySQL tenant, you can also use a MySQL client to access OceanBase Database.

   Notice

   In order to use versions of OBClient earlier than V2.2.1, install OceanBase Connector/C due to the dependency on OceanBase Connector/C. To obtain the RPM packages of OBClient and OceanBase Connector/C, contact OceanBase Technical Support.

   Here is an example:

   [root@xxx /home/admin/rpm]# rpm -ivh obclient-2.2.1-20221122151945.el7.alios7.x86_64.rpm
   Preparing...                          ################################# [100%]
   Updating / installing...
      1:obclient-2.2.1-20221122151945.el7################################# [100%]
   
   ## Verify that the installation is successful. ##
   [root@xxx /home/admin/rpm]# which obclient
   /usr/bin/obclient
   

Step 2: Configure directories

1. Clear the OceanBase Database directory (not required at the first deployment).

   If you want to clear the old OceanBase Database environment, or problems occur during the installation and deployment process of OceanBase Database and thereby cause an environmental disorder or generate files that will affect the next installation, you can directly clear the old OceanBase Database directory. In the following context, $cluster_name specifies the cluster name.

   [root@xxx admin]# su - admin
   -bash-4.2$ kill -9 `pidof observer`
   -bash-4.2$ rm -rf /data/1/$cluster_name
   -bash-4.2$ rm -rf /data/log1/$cluster_name
   -bash-4.2$ rm -rf /home/admin/oceanbase/store/$cluster_name /home/admin/oceanbase/log/* /home/admin/oceanbase/etc/*config*
   -bash-4.2$ ps -ef|grep observer
   

   Here is an example:

   [root@xxx admin]# su - admin
   -bash-4.2$ kill -9 `pidof observer`
   -bash-4.2$ rm -rf /data/1/obdemo
   -bash-4.2$ rm -rf /data/log1/obdemo
   -bash-4.2$ rm -rf /home/admin/oceanbase/store/obdemo /home/admin/oceanbase/log/* /home/admin/oceanbase/etc/*config*
   -bash-4.2$ ps -ef|grep observer
   

2. Initialize the OceanBase Database directory.

   We recommend that you specify the data directory of OceanBase Database to an independent disk and link this directory to the home directory of OceanBase Database by using a soft link. In the following context, $cluster_name specifies the cluster name.

   Note

   Starting from V4.3.0, OceanBase Database supports an independent slog disk so that slog files do not need to share a disk with data files. slog files and clog files can share an SSD. For more information about the installation directory of OceanBase Database, see Structure of the OBServer node installation directory.

   [root@xxx admin]# su - admin
   -bash-4.2$ mkdir -p /data/1/$cluster_name/{etc3,sstable,slog}
   -bash-4.2$ mkdir -p /data/log1/$cluster_name/{clog,etc2}
   -bash-4.2$ mkdir -p /home/admin/oceanbase/store/$cluster_name
   -bash-4.2$ for t in {etc3,sstable,slog};do ln -s /data/1/$cluster_name/$t /home/admin/oceanbase/store/$cluster_name/$t; done
   -bash-4.2$ for t in {clog,etc2};do ln -s /data/log1/$cluster_name/$t /home/admin/oceanbase/store/$cluster_name/$t; done
   

   Here is an example:

   [root@xxx admin]# su - admin
   -bash-4.2$ mkdir -p /data/1/obdemo/{etc3,sstable,slog}
   -bash-4.2$ mkdir -p /data/log1/obdemo/{clog,etc2}
   -bash-4.2$ mkdir -p /home/admin/oceanbase/store/obdemo
   -bash-4.2$ for t in {etc3,sstable,slog};do ln -s /data/1/obdemo/$t /home/admin/oceanbase/store/obdemo/$t; done
   -bash-4.2$ for t in {clog,etc2};do ln -s /data/log1/obdemo/$t /home/admin/oceanbase/store/obdemo/$t; done
   

   Note

   The obdemo directory is named after the cluster and can be modified. It is required when the process starts.

   The result is as follows:

   -bash-4.2$ cd /home/admin/oceanbase
   -bash-4.2$ tree store/
   store/
   `-- obdemo
    |-- clog -> /data/log1/obdemo/clog
    |-- etc2 -> /data/log1/obdemo/etc2
    |-- etc3 -> /data/1/obdemo/etc3
    |-- slog -> /data/1/obdemo/slog
    `-- sstable -> /data/1/obdemo/sstable
   
   6 directories, 0 files
   

Step 3: Initialize the OceanBase cluster

1. Start the observer process on the node.

   Start the observer process as the admin user on each node.

   Notice

   In a three-replica OceanBase cluster, the startup parameters of the OBServer nodes are not exactly the same When you start the observer process, you only need to specify three or more servers that run RootService. You can add servers after the cluster is created.

   cd /home/admin/oceanbase && /home/admin/oceanbase/bin/observer {-I $ip | -i $devname} -P $rpc_port -p $sql_port -z $zone_name -d /home/admin/oceanbase/store/$cluster_name -r '$ip:2882:2881' -c $cluster_id -n $cluster_name -o "system_memory=30G,datafile_size=500G,config_additional_dir=/data/1/$cluster_name/etc3;/data/log1/$cluster_name/etc2"
   

   The parameters are described in the following table.

   Parameter	Description
   -I | -i	-I: the IP address of the node to be started. In multi-node deployment, you cannot use 127.0.0.1 as the destination IP address. We recommend that you use an IP address such as -I 10.10.10.1, to start a node. -i: the NIC name. You can use the ifconfig command to view the NIC name. Note OceanBase Database allows you to start a node by specifying both the IP address and the NIC. For example, -I 10.10.10.1 -i eth0. However, we recommend that you do not use this method.
   -p	The service port number, which is usually set to 2881.
   -P	The RPC port number, which is usually set to 2882.
   -n	The name of the cluster. It can be modified. Cluster names must be unique.
   -z	The zone to which the started observer process belongs.
   -d	The primary directory of the cluster, which is created during initialization. Do not modify fields other than $cluster_name.
   -c	The cluster ID. It is a group of digits and can be modified. Cluster IDs must be unique.
   -l	The log level.
   -r	The RootService list in the format of $ip:2882:2881. Multiple items are separated with semicolons (;) to indicate RootService information.
   -o	Optional. The cluster startup parameters. You can specify values for multiple parameters and separate the settings of different parameters with commas (,). We recommend that you set appropriate values for cluster startup parameters to optimize cluster performance and resource utilization. Here are some commonly used cluster startup parameters: cpu_count: the total number of system CPU cores. system_memory: the memory reserved for the tenant whose ID is 500, that is, the internal reserved memory of OceanBase Database. If the machine has a small memory size, you can set this parameter to a smaller value. However, insufficient memory may occur during performance testing. memory_limit: the total memory size available. datafile_size: the size of disk space available for data files. That is, the size of the data file sstable (for one-time initialization) in OceanBase Database. You can evaluate the value of this parameter based on the available space on /data/1/. We recommend that the value is no less than 100G. datafile_disk_percentage: the percentage of total disk space allowed for data files. datafile_next: the step size of automatic scale-out for disk files. datafile_maxsize: the maximum size of disk space allowed for automatic scale-out of data files. config_additional_dir: the local directories for storing multiple copies of configuration files for redundancy. log_disk_size: the size of the log disk where REDO logs are stored. log_disk_percentage: the percentage of total disk space occupied by REDO logs. syslog_level: the level of system logs. syslog_io_bandwidth_limit: the maximum I/O bandwidth available for system logs. If this value is reached, the remaining system logs are discarded. max_syslog_file_count: the maximum number of log files that can be retained. enable_syslog_recycle: specifies whether to enable the switch for recording old logs before the OBServer node starts. It works in conjunction with max_syslog_file_count to determine whether the log recycling logic takes old log files into account. You can configure datafile_size, datafile_disk_percentage, datafile_next, and datafile_maxsize together to achieve automatic scale-out of disk space for data files. For more information, see Configure automatic scale-out of disk space for data files. For more information about cluster configuration, see Cluster-level parameters.

   Here are some examples:

   zone1:

   [root@xxx admin]# su - admin
   -bash-4.2$ cd /home/admin/oceanbase && /home/admin/oceanbase/bin/observer -I 10.10.10.1 -P 2882 -p 2881 -z zone1 -d /home/admin/oceanbase/store/obdemo -r '10.10.10.1:2882:2881;10.10.10.2:2882:2881;10.10.10.3:2882:2881' -c 10001 -n obdemo -o "system_memory=30G,datafile_size=500G,config_additional_dir=/data/1/obdemo/etc3;/data/log1/obdemo/etc2"
   

   zone2:

   [root@xxx admin]# su - admin
   -bash-4.2$ cd /home/admin/oceanbase && /home/admin/oceanbase/bin/observer -I 10.10.10.2 -P 2882 -p 2881 -z zone2 -d /home/admin/oceanbase/store/obdemo -r '10.10.10.1:2882:2881;10.10.10.2:2882:2881;10.10.10.3:2882:2881' -c 10001 -n obdemo -o "system_memory=30G,datafile_size=500G,config_additional_dir=/data/1/obdemo/etc3;/data/log1/obdemo/etc2"
   

   zone3:

   [root@xxx admin]# su - admin
   -bash-4.2$ cd /home/admin/oceanbase && /home/admin/oceanbase/bin/observer -I 10.10.10.3 -P 2882 -p 2881 -z zone3 -d /home/admin/oceanbase/store/obdemo -r '10.10.10.1:2882:2881;10.10.10.2:2882:2881;10.10.10.3:2882:2881' -c 10001 -n obdemo -o "system_memory=30G,datafile_size=500G,config_additional_dir=/data/1/obdemo/etc3;/data/log1/obdemo/etc2"
   

   You can use the following commands to check whether the observer process has started successfully:

   • Run the netstat -ntlp command. If ports 2881 and 2882 are listened to, the observer process is started.
   • Run the ps -ef|grep observer command to return information about the observer process.

   Here is an example:

   -bash-4.2$ netstat -ntlp
   (Not all processes could be identified, non-owned process info
   will not be shown, you would have to be root to see it all.)
   Active Internet connections (only servers)
   Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
   tcp        0      0 0.0.0.0:2881            0.0.0.0:*               LISTEN      11114/observer
   tcp        0      0 0.0.0.0:2882            0.0.0.0:*               LISTEN      11114/observer
   ...        ...    ...                       ...                     ...         ...
   
   -bash-4.2$ ps -ef|grep observer
   admin     11114      0 40 16:18 ?        00:00:17 /home/admin/oceanbase/bin/observer -I 10.10.10.1 -P 2882 -p 2881 -z zone1 -d /home/admin/oceanbase/store/obdemo -r 10.10.10.1:2882:2881;10.10.10.2:2882:2881;10.10.10.3:2882:2881 -c 10001 -n obdemo -o system_memory=30G,datafile_size=500G,config_additional_dir=/data/1/obdemo/etc3;/data/log1/obdemo/etc2
   

2. Perform the bootstrap operation on the cluster.

   Connect to any node by using the obclient command. The password is empty.

   [root@xxx admin]# obclient -h127.0.0.1 -uroot -P2881 -p******
   
   obclient> SET SESSION ob_query_timeout=1000000000;
   Query OK, 0 rows affected
   
   obclient> ALTER SYSTEM BOOTSTRAP ZONE 'zone1' SERVER '10.10.10.1:2882',ZONE 'zone2' SERVER '10.10.10.2:2882',ZONE 'zone3' SERVER '10.10.10.3:2882';
   Query OK, 0 rows affected
   

   Notice

   If an error is reported in this step, the reason may be that the startup parameter of the observer process is incorrect, the privileges on the directories related to the OBServer nodes are incorrect, the space of the log directory does not meet the required proportion, the time is not synchronous on the OBServer nodes, or the node memory resources are insufficient. The log directory issue occurs because the log directory shares the same upper-level directory with the data directory, resulting in space occupation by the data directory. Check these issues and then clear the OceanBase Database directory.

3. Verify that the cluster is initialized.

   After you perform the bootstrap operation and execute the SHOW DATABASES statement, if oceanbase appears in the database list, the cluster is initialized.

   obclient> SHOW DATABASES;
   +--------------------+
   | Database           |
   +--------------------+
   | oceanbase          |
   | information_schema |
   | mysql              |
   | SYS                |
   | LBACSYS            |
   | ORAAUDITOR         |
   | test               |
   +--------------------+
   7 rows in set
   

4. Change the password.

   By default, the password of the root user under the sys tenant is empty. After successful initialization, you need to change the password.

   obclient> ALTER USER root IDENTIFIED BY '******';
   Query OK, 0 rows affected
   

What to do next

After the cluster is created, you can create user tenants based on your business needs.

For more information about how to create a tenant by using the CLI, see Create a tenant.

References

• Connect to an OceanBase tenant by using OBClient
• System parameters
• ALTER USER
• User tenants
• CREATE TENANT