Chapter 1 System ISO image download CentOS
1.1 Download CentOS system ISO image instructions
to install CentOS system, there must CentOS system software installation program, you can visit the official site http://www.centos.org CentOS through a browser, then navigation bar to find Downloads> Mirrors connection, you can download click to enter, but it is overseas sites, download speed is limited.
http://mirrors.aliyun.com # aliyun official mirror sites.
http://vault.centos.org #vault vault
http://vault.cenos.org/6.7/isos/x86_64
1.1.1 Why funny business production environment, all using 64-bit operating system?
At present, most production environments, all using CentOS 64-bit systems, 32-bit and 64-bit systems to locate and distinction.
1.1.2 One difference: different positioning of the original design of
64-bit operating system is designed to locate: the field to meet the mechanical design and analysis, 3D animation, video editing and creation, as well as scientific computing and high-performance computing applications, these applications the common feature is that the field requires a lot of system memory and floating point performance. Simply put, using a 64-bit operating system is running special software platform in the industry of high-tech personnel and design. While the 32-bit operating system designed for the average user.
1.1.3 The difference between the two: Installation Requirements configure different
64-bit operating system can only be installed on 64-bit computers (CPU must be 64-bit), and only for 64-bit software to its best effect. 32-bit operating system can be installed on both 32-bit (32-bit CPU) computer, you may be mounted on a 64-bit (64-bit CPU) computer. Of course, at this time 32-bit operating system is unable to play a 64-bit hardware performance.
1.1.4 The three differences: the different operation speed.
1.1.5 distinguish four: addressability different
different maximum memory support.
32-bit system with 4GB of memory 3.5GB == PAE support more memory.
64-bit Windows 7 x64 Edition support updates memory.
Elite 64-bit processor is also reflected in the operating system control of the memory. Since the address is the specific integer, a the ALU (arithmetic logic unit) and registers can handle larger integer, which is greater address. For example, Windows 7 x64 Edition supports up to 128GB of physical memory and 16TB of virtual memory, and 32-bit CPU and operating system can support a theoretical maximum of only 4GB of memory, which is actually about 3.2GB of memory, of course, 32-bit systems can support large memory by extension, the extension uses PAE technology.
1.2 Installation Configuration Vmware virtual machines and virtual machine creation
☆ use of virtual machine software to build Linux learning environment is simple, easy to use, the most important is the use of Linux virtual machine simulated and real Linux is hardly any difference. After the work is connected to the server via ssh, rather than directly running the engine room, therefore, use the software to build a virtual machine environment is the closest to the enterprise work environment.
☆ to build Linux clusters and other large-scale environments sometimes need to open with a few virtual machines (only 256-521MB each virtual memory, 6-8GB hard disk space that is), the virtual machine can easily meet the demand of memory large enough (8G)
enterprise real server hardware hands-on introduction http://v.qq.com/page/g/x/y/g016789xvxy.html
1.3 virtual machine installation process
Modify the configuration of the network card
Start eth0 NIC
Ifup eth0
View the server's ip address location
Ifconfig
Restart card
ifdown eth0
ifup eth0