Cloud Applications

Getting started with server home Linux Chapter 1 1 Introduction to Linux After several years of experience dealing with many new Linux users, the biggest problem is that it is not difficult, not stupid, but lazy to learn about Linux! Many people do

1. in fact, the matching extension also needs to be added to the display extension of the-m reference module. the default value is implicit extension. do not use the-m status Detection Package to filter-mstate -- state {NEW, ESTATBLISHED, INVALID,

# Enable port 22 iptables-AINPUT-ptcp -- dport22-jACCEPTiptables-AOUTPUT-ptcp -- sport22-jACCEPT # Disable all ports iptables-PINPUTDROPiptables-PFORWARDDROPiptables-POUTPUTDROP # enable port 80, HTT # enable port 22 Iptables-A input-p tcp -- dport

Tcpdump is a Sniffer tool, which is actually a packet capture tool on the network. It can also analyze captured packets. Generally, the system is installed by default. Tcpdump command description: tcpdump uses the command line method. the command

This document is intended for beginners of iptables. If you have just learned the principles and basic syntax of iptables, but you still do not know how to actually use this tool in the online server environment, read this article. Iptables's two

After freebsd9.0 is installed by default, start the pf: pfctl-e prompt: pfctl:/dev/pf: Nosuchfileordirectory. the kernel needs to load the corresponding module: # kldloadpf or modify the startup script rc. conf: pf "YES" pf_rules "/etc/pf. conf "###

The principles and concepts of the iptables firewall are described above. here we mainly describe the parameters and usage of the iptabels command. let's first review the content of the iptables control process in the previous article. Iptables uses

In Linux,. bash_profile,. bash_logout, and. bashrc files have special meanings for bash. When a user logs on or calls another bashshell, they provide a method to automatically establish the logon account environment and allow various commands to be

Enter mantcpdump in linux. the following content is displayed at the beginning of manual: tcpdump [-AdDeflLnNOpqRStuUvxX] [-ccount] [-Cfile_size] [-Ffile] [-iinterface] [-mmodule] [-Msecret] [-rfile] [-ssnaplen] [-Ttype] [- Enter man in

Read [-ers] [-ufd] [-ttimeout] [-aaname] [-pprompt] [-nnchars] [-ddelim] [name...] Onelineisreadfromthestandardinput, bytes-u Read [-ers] [-u fd] [-t timeout] [-a aname] [-p prompt] [-nnchars] [-d delim] [name...] One line is read from the standard

Overview iptables overview iptables basic iptables syntax iptables instance case description Firewall Overview firewall refers to a combination of components set between different networks or network security domains, it enhances the security of the

This article describes how to use iptables to implement NAT in linux. if you need it, refer to it. This section describes iptables's NAT function. This article only describes how to use iptables to configure NAT in linux. For more information about

Chkconfigchkconfig is frequently used in command line operations. It allows you to conveniently set and query system services at different running levels. You can easily manage your startup services. Note: Remember that chkconfig does not

LVM: logicalvolumemanager (logical volume management). LVM shields the underlying disk layout and facilitates dynamic adjustment of disk capacity. 1. steps for creating a logical volume: 1) use the fdisk tool to convert the disk to a linux partition

1. move and redirect: n jumps to n rows, and n indicates that the row number nG jumps to n rows, n indicates the row number CTRL-] jump to the subject CTRL-O corresponding to the current cursor back to the previous position h left j down k l right W

1. the/etc/fstab file describes how to configure the/etc/fstab file for automatic mount in Linux. This file is used to store static information of the file system. When the Linux system starts, it automatically reads information from the file and

In vi/vim, you can use the: s command to replace the string. : S/vivian/sky/replace the first vivian in the current row with sky: s/vivian/sky/g, replace all vivian in the current row with sky: n, $ s/vivian/sky/replace the first vivian from row n

I have been using tcpdump during my work, and it is very convenient. today, I have tried tcpdump to find that I don't know such powerful functions. it's called a sweat. Work is always in useTcpdumpIt is very convenient. Today, Baidu is on a

Many people say that they should change the/boot/grub. conf file and change default0 to defualt1. I am not sure whether this method is correct in linux, but I know it is incorrect in ubuntu because you cannot find this file in ubuntu. My machine is

Because the redhat yum online update is charged, it cannot be used if it is not registered. to use it, you need to uninstall the redhat yum, restart the installation, and configure other sources, the detailed process is as follows: 1. delete the