Cloud Security

Basic working principle of Shell The most important system program provided by Linux is the Shell command language interpreter. It does not belong to the kernel, but runs in user mode outside the core. Its basic function is to explain and execute

From the programmer's perspective, Shell itself is a program written in C language. From the user's perspective, Shell is a bridge between the user and the Linux operating system. You can enter commands for execution and use Shell script programming

Compile as script The basic form of this script is from the rsync website. In fact, there is only one command: Rsync-force-ignore-errors-delete-excluded-exclude-from = exclude_file-backup-dir = 'date + % Y-% m-% d'-av Key parameters are: -Backup:

There are two ways to assign values to an array variable: (1) name = (value1... valuen) The subscript starts from 0. (2) name [index] = value Arrays are a form of organizing several variables of the same type in order to facilitate processing in

Recently, I learned the expect scripting language through mongoingshortct books. This scripting language is an extension of the tcl language and is used to solve the problem that some tools cannot automatically interact with each other. For example,

Wget http://caspian.dotconf.net/menu/Software/SendEmail/sendEmail-v1.56.tar.gz Tar xvf sendEmail-v1.56.tar.gzMusic sendEmail-v1.56 sendEmail Vi/etc/ssh/sshrc#! /Bin/shUser = $ USERIp =$ {SSH_CLIENT % *}If ["$ user "! = "Root"] | ["$ ip "! = "192.168

1. display the 10 processes that consume the most memory/CPU ps aux | sort-nk + 4 | tailps aux | sort-nk + 3 | tail2. view the processPs-e-o "% C: % p: % z: % a "| sort-k5-nr3. sort ps-e-o" % C: % p: % z by cpu utilization from large to small: % a "|

When running a job in Linux, you often encounter the following situations: a large number of jobs need to be run, and the time required to complete each job is not very long. if we run these jobs in serial mode, it may take a long time. If we run

Mail can be usedAlarm, you can also install an email reminder tool on your Android phone. If you are in trouble, you can use mobile Feixin, but the current smart phones are basically wcdma and cdma, there are few people around me who use mobile

The generated password and user input can be repeated.Therefore, it may be much more difficult to guess general rules.Current version rules:A -- number pair, location pairB -- after excluding the result of A, the number is correct, but the position

Components used to Query IP addresses wget http://rfyiamcool.googlecode.com/files/nali-0.1.tar.gz tar zxvf nali-0.1.tar.gz cd nali-0.1 ./configure && make && make install The steps are similar to those of nginx, but the method for

Test the network connection status based on the running status of the daemon. This is far better than simply finding the network connection status parameters. The following uses a script to test the status of a specified process name and displays

Note: The following is an excerpt from the book "familiar with linux system security and optimization.1. system security record files# More/var/log/secureCount the IP addresses and times of access.# Grep-oP '(\ d + \.) {3} \ d +'/var/log/secure |

DDoS Deflate can prevent a small amount of DDoS and CC attacks, and it takes less time. We recommend that you use it. 1. Check whether iptables is running service iptables status If "iptables: Firewall is not running." is displayed, iptables is

Nowadays, the Internet is very insecure. Many people use some scanners to scan the ssh port and try to connect to the ssh port for brute-force cracking (brute-force scanning). Therefore, we recommend that you use the vps host space, set a complex

About partitions If a potential hacker attempts to attack your Linux server, he will first try Buffer Overflow. In the past few years, buffer overflow is the most common form of security vulnerabilities. More seriously, the buffer overflow

Recently, in order to ensure security for the launch of the project, it is necessary to defend against DDOS and CC attacks and capital problems of the company. Now, O & M engineers are writing scripts for use, only simple defense 1. View IP

PHP security configuration in Linux is a complex process, which involves many detailed settings. A script is sent here, this script is used to check whether your PHP environment has security risks and reinforce your PHP environment.Function: 1.

You can use commands to view IP addresses that are too high for web connections, but you need to use AI to seal them. This is too troublesome. You can directly write a script to automatically resolve this issue. The web server uses nginx and python

Whether you are an ordinary Linux Desktop user or a system administrator managing multiple servers, you are faced with the same problem: an increasing number of threats. Linux is an open system that allows you to find many ready-made programs and