1, Application of Linux as enterprise server: Linux system can be enterprise architecture WWW server, database server, load balancing server, mail server, DNS server, proxy server, router, etc. It not only reduces the operating cost of enterprises, but also obtains the high stability and reliability brought by Linux system, and does not need to consider the copyright issue of commercial software.
2. Application field of embedded Linux system: Because Linux system is open source, powerful, reliable, stable, flexible and extensible, it widely supports a large number of micro-processing architectures, hardware devices, graphics support and communication protocols. In the embedded application field, it ranges from Internet devices (routers, switches, firewalls, load balancers) to special control systems (vending machines, mobile phones, PDA), especially after several years of development.
3. Personal desktop Linux application field: The so-called personal desktop system is actually the personal computer system we use in the office, such as Windowsxp, windows7, Mac and so on. The support of Linux system in this respect is also very good, which can fully meet the needs of daily office and parents.
The development prospect of Linux in the current market is very good. Not only is it widely used, but there are also many jobs that can be employed after study, and the salary is good.
What are the two ways to start, close and restart network services in Linux?
The first one is the direct service service name start/restart/stop mentioned upstairs. The second one can go directly to the /etc/init.d directory. The script files of the service are stored in this directory, and can be started/restarted/stopped directly, such as #cd/etc/init.d#. /ntpdrestart close ntpd: start ntpd: #
How does linux check whether the service is running?
You can enter commands under Linux:
1, $servicesshdstatus2 and # servicenamestatus 3 are the current status, and # chkconfig-listservicename is the check startup status, that is, whether to automatically start the machine. note:
1. If you can't find the service and chkconfig, you can try /sbin/service and /sbin/chkconfig2. If you use ubuntu, it seems that you need to use /etc/init.d/servicenamestatus to check the current status (servicename is the service name you want to check).
Other ways to view the current startup status of the service 1. The PS-AUX | GREPXXX in the process view command is used to check whether the process or service exists.
2. Use the services command 1 to check the running status of a single service: Is the service name status such as # servicesshdstatuspensh-daemon (PID 3701) running?
2. Check the running status of all services: service_status-all.
What are the basic functions of windows and Linux operating systems?
The functions of Linux operating system are as follows:
1, linux is rich in software, and all kinds of software under windows can basically find corresponding substitutes under linux, so that you don't know which one to choose, and they are basically free, which can avoid copyright troubles. And there are many softwares under linux that are not available under windows.
2.Linux is safe and stable, without viruses and Trojans. Suitable for large servers, basically there are not so many viruses under Windows, unless you want to be poisoned yourself.
3.Linux is fast. Generally speaking, windows will be slower and slower, while Linux does not have this problem.
4. The 4.Linux interface is beautiful, and the desktop service is gradually improving. Ubuntu is very easy to use, and the era when windows dominates the desktop is still far away.
5. The low price of 5.Linux makes it the best choice for servers, especially for embedded development.
6.Linux is free and open. This not only refers to the price, but also means that you can know the internal mechanism of the program and the details of the operating system in detail, and even modify it yourself. For non-technical people, you can also feel the free atmosphere of Linux, which is already a humanistic spirit.
Linux operating system:
Linux operating system is a clone system based on UNIX operating system, which was born in 199 1 year, 1 year and was officially announced for the first time. With the help of the Internet and the joint efforts of computer enthusiasts all over the world, it has become the most used UNIX operating system in the world today, and the number of users is still growing rapidly.
What resources does linux startup service occupy?
Loadaverage: the average value of current system load. The last three values are the average values of the processes before 1 minute, 5 minutes and 15 minutes respectively.
CPU:0.3% The percentage of CPU occupied by American user space.
1.0% CPU percentage occupied by SY kernel space
Percentage of CPU occupied by processes with changed priority in 0.0%ni user process space.
98.7%id percentage of idle CPU
Percentage of CPU time waiting for input and output.
0.0% high
0.0% silicon
KiBMem: total memory, current usage, free memory and buffer usage respectively.