Oracle Real Application Clusters (RAC) is a key component of Oracle database technology that allows multiple Oracle database instances to run in parallel on multiple servers. This cluster configuration increases the availability of the database system and provides better performance and scalability. This article is a guide on installing Oracle RAC on Oracle Linux.
- Hardware and Software Requirements
When you begin installing RAC, make sure you meet the following system and software requirements:
Hardware Device Requirements:
- At least two servers or virtual machines
- At least 8 GB RAM per server or virtual machine
- At least 2 CPU cores per server or virtual machine
- Each server or virtual machine must have enough hard disk space to install the operating system and Oracle software
Software requirements:
- Oracle Linux 7.x
- Oracle 12c Release 2
- Oracle Grid Infrastructure 12c Release 2
- Preparation work
Before starting to install Oracle RAC, you need to Some preparation. Here are some required steps:
2.1 Configure Network
Before installing Oracle RAC, make sure that each server or virtual machine can communicate with each other. The best approach is to configure a dedicated virtual LAN (VLAN) to create a private network communication channel between various nodes. You can also use Network Naming Service (DNS) or a local hosts file to identify individual nodes.
2.2 Set the host name
Set a unique host name on each server or virtual machine to ensure that no naming conflicts or other problems occur during installation and subsequent operations.
2.3 Install necessary software packages
Before starting the RAC installation, ensure that all necessary software packages are installed and configured correctly. These packages include firewalls, SELinux, OpenSSH, etc.
2.4 Create Oracle User and Group
Create a new Oracle user and group to use to run Oracle during the RAC installation. Make sure that this user has sufficient permissions to access the installation directory and start and stop services.
- Grid Infrastructure Installation
Grid Infrastructure (GI) is an Oracle cluster environment running on Linux that provides highly available and scalable Oracle databases and applications deploy. Here are the installation steps of GI:
3.1 Download Oracle software
Download the installation file of Oracle Grid Infrastructure 12c Release 2 from the official website and extract it to the server or virtual machine.
3.2 Create a response file
Use the response file template provided by Oracle to create a response file that contains all installation parameters. You can keep this file as a shared file for subsequent installation operations.
3.3 Configure SSH
Set up SSH password-free login between all servers or virtual machines, and ensure that the hosts can access each other.
3.4 Run the installation program
Use the response file to start the installation program, and perform the following operations according to the prompts:
- Select the components to be installed, such as Clusterware, database software wait.
- Enter the location of the Oracle installation directory.
- Enter the name of the database instance and other necessary configuration parameters.
- After completion, verify that the installation and configuration are correct.
- Oracle RAC database installation
After installing Grid Infrastructure, you can install the RAC database. The following are the steps to install the RAC database:
4.1 Download Oracle software
Download the installation file of Oracle RAC 12c Release 2 from the official website and extract it to the server or virtual machine.
4.2 Create a response file
Use the response file template provided by Oracle to create a response file that contains all installation parameters. You can keep this file as a shared file for subsequent installation operations.
4.3 Shared storage configuration
Configure shared storage for inter-cluster communication. On Linux, you can use SCSI-based shared storage to provide cluster shared data and configuration. To implement shared storage, install and configure bulk storage (SAN) or network-attached storage (NAS) devices on all nodes.
4.4 Run the installation program
Use the response file to start the installation program and perform the following operations according to the prompts:
- Select the components to be installed, such as RAC database, instance wait.
- Set the database name and instance name.
- Enter the location of the shared storage and other necessary configuration parameters.
- After completion, verify that the installation and configuration are correct.
- Summary
Oracle RAC is a powerful database technology that provides high availability and scalability. This article provides an easy-to-follow guide to help you install Oracle RAC on Oracle Linux. Please make sure that you meet all hardware and software requirements before starting the installation and follow each step to ensure that RAC is installed and configured correctly.
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