IT industry working direction
A: Cloud computing - large data
operation and maintenance
L
Linux operating system (Windows-- Desktop Engineer)
L
---------------------------- -------------------------------------------------- -------------------------------------------------- -----------------------
L L L
Linux operation and maintenance of virtualization KVM \ XEN Hadoop + JAVA = large data storage direction
(web framework) L L
(build your own personal website) openstack ----------------------------------------------- --------------------------------------------------
the the the the the the the
Docker (k8s) HDFS Mr. hive zookeeper ... Språk (Scala)
SQL
Development - computer language
BASIC early machine language
C C ++: development system, development drive
(driver: a set of instructions need to convert between the various equipment manufacturers make interworking between equipment manufacturers)
front end: JS php css html
JAVA
Tools: scripting language - shell \ perl \ python
Database: MYSQL, nosql
Two: the customer
(result)
refrigerator + milk + Mold = (ice cream)
Data storage: disk - --SAN, NAS, DAS (specialized stores data in disk array)
-
a distributed storage architectures - [HDFS: storage (Hadoop Distributed File System) massive data] - cluster (Application software)
(Refrigerator): System - Linux
Mold:
. 1, the HDFS: (the Hadoop Distributed File System)
2, of reduces [Map data-processing clusters: the huge amounts of data that he is in a certain way, to modify the relationship between the key (Key-value)
the HDFS Map + - = the Hadoop of reduces [ cluster (running Linux on a High Performance cluster)
algorithm:
3, mathematically (statistically) + Python = algorithm
4, data visualization
Third, the operating system Introduction
1, the operating system doing?
Platform - Deck (hardware resource) under Kai (application)
of the three components of the hardware platform: CPU, memory (memory), I / O devices
(operator input device controller memory output apparatus)
the CPU: all operations
memory: providing data to the CPU (CPU can only read data to the memory), reboot the system data in memory will be lost;
CPU reads the memory specified (required data), a process we call addressing; (a physical address, logical address)
IO device: network card (adapter adapter): Ethernet (Ethernet)
disk (IDE, SAS, SSD) mechanical hard drives, solid state drives (fast)
Knowledge expansion:
OSI seven layer model ---- TCP / IP four-layer model of
an application layer - l QQ Application Layer
Presentation Layer - l instruction
Session Layer - session to establish a session l
transport layer - through the transfer port of discriminating the application l layer
The network layer - IP l network layer
The data link layer - MAC address of the host-to-host layer, l
the physical layer: the specific physical device (a hardware device) l
[lower] service to an upper layer
The operating system itself is a software program, but it does not directly provide customers with the application, but to provide hardware resources for other applications;
the operating system is divided: user space and kernel space