Rhel7-unix/linux System Introduction

How to call a good Linux ops person?

If you have the opportunity and condition: the environment can hone a person's ability and will.

Make bold projects that you have never done, and each project is a great boost to yourself.

Have good environmental resources do not waste, good grasp, and slowly progress.

If you do not have these opportunities for the time being:

Try to improve your ability to be a ready person, maybe the opportunity will come soon.

If you feel that there is no room for development:

Try to change the status quo, the comfortable environment will not make a professional operation and maintenance personnel progress.

No matter when and where always maintain a good mentality, careful, calm, self-confidence, progressive, humble , character determine fate, habits affect achievements.

What is Linux ops?

Linux operation and maintenance engineer;

Operations engineer, assemble network, System, database, development, security work in a "compound talent".

What are Linux ops jobs doing?

"Operation and Maintenance" refers to: Portal application operations, and other operations such as network, the difference between the system is very large; then we have large-scale website and small site operations, mainly from the operational dimension of complexity, such as site specifications, visibility, server magnitude, PV volume (PageView), and other factors are not the focus ；

The habits and ideas of Linux professional OPS personnel

1. Guarantee the system's SLA: guarantee the system 99.99999% available time

2. System Disaster Tolerance , machine room disaster tolerance , program fault tolerance ( disaster tolerance)

3. Operational efficiency : scripting Automation , driving system architecture design and system automatic fault tolerance .

4. Resource cost control : assess whether the resource is reasonable in architecture design and save machine resources through architecture optimization

5. Monitoring and optimization (rapid detection), monitoring coverage to the full supervision , control the addition of high efficiency , Fewer alarms to avoid the wolves.

6. Rapid Recovery : Develop corresponding response measures for potential problems and risk points; important measures to be rehearsed in advance

Settling of the problem, maturity of the solution

7. have a leisurely, calm approach to the problem, solve the problem

What is two-way technology?! is a server with two CPUs, two brains

Branches of Linux:

Linux has developed so far, there are many branches, the more outstanding Red Hat Enterprise Linux (Red Hat), Debian

Red Hat Enterprise Systems is the largest open source technology manufacturer in the world, offering a robust and robust Linux suite system with comprehensive global technical support.

CentOS was originally "recompiled/released" by the Red Hat Enterprise system for free use by the user and is currently officially joined to Red Hat and continues to be free (updated with Rhel update)

Fedora[linux] Desktop system Suite originally launched by Red Hat Inc. (also with Enterprise Edition)

Users can experience the latest technologies and tools for free, and add them to rhel when they are mature

debian---The open source operating system of the national Organization, the support of various kernel architectures is good, stability, security and more free technical support

Ubuntu is a Debian-based desktop version, and Ubuntu is a Debian-based product that is highly compatible with the new hardware.

Ubuntu and Fedora are widely considered to be extremely good Linux desktop systems

Linux Related certifications:

Red Hat Enterprise Linux System (Linux,rhel) has a high market share and is highly recognized

Unix/linux System Features:

UNIX for General Banking

Linux for General server

Windows Desktop Office Public

Features: 1, high degree of modularity

Linux kernel design is very delicate, divided into process scheduling, memory management, interprocess communication, virtual file system and network interface of the five parts;

Features: 2, open source

Since the development of Linux systems has been closely integrated with the GNU project from the outset, most of its components are directly
From the GNU project.

Anyone or any organization who complies with the GPL will be free to use the Linux source code to provide maximum user satisfaction.

Linux is rich in software resources, and each generic program can be found almost everywhere on Linux, and the number is growing. All this makes it easy for designers to develop two of times on top of them.

Because the Linux source code exposes, also lets the user not to worry has "the rear gate" and so on security hidden danger.

Open source to the educational institutions to provide great convenience, and thus also promote the learning, promotion and application of Linux.

3. Wide range of hardware support
　　Linux can support microprocessors such as x86, ARM, MIPS, Alpha, and PowerPC, among many other architectures. It has been successfully ported to dozens of hardware platforms and can run on almost all popular processors.

4. Good safety and reliability
　The kernel is efficient and stable. The efficiency and stability of the Linux kernel has been verified by a large number of facts in various fields.
Linux in a large number of network management, network services and other aspects of the functions, can make it easy for users to establish a high-efficient and stable firewall, routers, workstations, servers and so on. To improve security, it also provides a large number of network management software, network analysis software and network security software.

5. have excellent development tools

The key to developing embedded systems is the need for a comprehensive set of development and debugging tools.

Embedded Linux provides developers with a complete set of toolchain (tool Chain) that makes it easy to debug from the operating system to the application software at every level.

6. Have a good network support file system support

Linux has been linked to the Internet since its inception, supports a variety of standard Internet Protocol protocols, and is easily ported to embedded systems. At present, Linux almost supports all major network hardware, network protocols and file systems, so it is a good platform for NFS. SMB CIFS

7. Fully compatible with UNIX
　　Currently, the tools and utilities included in Linux can accomplish all of the major UNIX functions.
But because Linux is not designed for real-time, this is the biggest regret that Linux has applied in real-time systems.

However, there are many free software enthusiasts are making unremitting efforts to this end, but also achieved a lot of results

VMWare 12 Installation Tips

Tip 1. VMware Virtual Machine Tricks increase the physical memory available to the virtual machine (it is best to adjust the memory after shutting down)

Tip 2. Tips for adding hardware devices to VMware virtual machine tricks. () boot status can not add hard disk)

Tip 3. Switching skills of control over VMware virtual machine techniques

Ctrl+alt return to normal mode (host)

Alt+g capturing mouse and keyboard focus for a virtual machine (virtual machine)

Ctrl+l Clear Screen

CTRL + C cancels an operation

Ctrl+alt+enter into full screen mode

Rhel7-unix/linux System Introduction