最近连续有客户问我，如果修改SSH，会对oracle RAC有什么影响。这个问题，我也看过资料，对oracle RAC的运行是没有影响的，但是
最近连续有客户问我，如果修改SSH，会对Oracle RAC有什么影响。这个问题，我也看过资料，对oracle RAC的运行是没有影响的，但是“说”是没有力度的。
今天正好相对比较空闲，全程针对SSH进行测试，并将测试过程记录下来，与大家分享一下。
Part I. 测试前状态收集
1. 数据库版本为11.2.0.4的两节点的RAC，分别是node111g 和node211g
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
2. 集群状态正常
[grid@node111g ~]$ crsctl status res -t
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
ONLINE ONLINE node111g
ONLINE ONLINE node211g
ora.DGROUP_01.dg
ONLINE ONLINE node111g
OFFLINE OFFLINE node211g
ora.FRA.dg
ONLINE ONLINE node111g
ONLINE ONLINE node211g
ora.LISTENER.lsnr
ONLINE ONLINE node111g
ONLINE ONLINE node211g
ora.LISTENER_TEST.lsnr
ONLINE ONLINE node111g
ONLINE ONLINE node211g
ora.OCR.dg
ONLINE ONLINE node111g
ONLINE ONLINE node211g
ora.VOTE3D.dg
ONLINE ONLINE node111g
OFFLINE OFFLINE node211g
ora.asm
ONLINE ONLINE node111g Started
ONLINE ONLINE node211g Started
ora.gsd
OFFLINE OFFLINE node111g
OFFLINE OFFLINE node211g
ora.net1.network
ONLINE ONLINE node111g
ONLINE ONLINE node211g
ora.ons
ONLINE ONLINE node111g
ONLINE ONLINE node211g
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.TEST_SCAN1.lsnr
1 ONLINE ONLINE node111g
ora.cvu
1 ONLINE ONLINE node211g
ora.node111g.vip
1 ONLINE ONLINE node111g
ora.node211g.vip
1 ONLINE ONLINE node211g
ora.oc4j
1 ONLINE ONLINE node211g
ora.orcl.db
1 ONLINE ONLINE node111g Open
2 ONLINE ONLINE node211g Open
ora.orcl.romi.svc
1 ONLINE ONLINE node111g
ora.orcl.test.svc
1 ONLINE ONLINE node211g
2 ONLINE ONLINE node111g
ora.scan1.vip
1 ONLINE ONLINE node111g
3. SSH配置文件，默认SSH端口是22，文件有提及，不建议修改默认值，但是！！！我就想改，怎么办呢？？
[root@node111g ~]# more /etc/ssh/sshd_config
# $OpenBSD: sshd_config,v 1.73 2005/12/06 22:38:28 reyk Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/local/bin:/bin:/usr/bin
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options change a
# default value.
#Port 22
#Protocol 2,1
Protocol 2
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
......
[root@node111g ~]#
[root@node211g ~]# more /etc/ssh/sshd_config
# $OpenBSD: sshd_config,v 1.73 2005/12/06 22:38:28 reyk Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/local/bin:/bin:/usr/bin
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options change a
# default value.
#Port 22
#Protocol 2,1
Protocol 2
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
Part II 实际修改部分
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MySQL vs. Other Programming Languages: A ComparisonApr 19, 2025 am 12:22 AMCompared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.
Learning MySQL: A Step-by-Step Guide for New UsersApr 19, 2025 am 12:19 AMMySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.
MySQL: Essential Skills for Beginners to MasterApr 18, 2025 am 12:24 AMMySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.
MySQL: Structured Data and Relational DatabasesApr 18, 2025 am 12:22 AMMySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.
MySQL: Key Features and Capabilities ExplainedApr 18, 2025 am 12:17 AMMySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.
The Purpose of SQL: Interacting with MySQL DatabasesApr 18, 2025 am 12:12 AMSQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.
MySQL for Beginners: Getting Started with Database ManagementApr 18, 2025 am 12:10 AMThe basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA
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