Cloud Applications

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

Reading Tips: The logs in the Linux firewall are very helpful for debugging rules. you can see where the packages are going, what rules are processed, what rules are processed, and what kind of packages are processed. The following describes how to

Iptables is a good firewall software in Linux, this article describes how to install iptables, add and clear rules, open specified ports, and shield basic applications of iptables in CentOS, such as specified ip addresses and ip segments. 1. install

The default script only enables port 80, 3306, and port 22 of the conventional web server # videfault_firewall.sh #! /Bin/bash #################################### ####################################### File: the default default_firewall.sh script

This article describes how to use iptables to create NAT in linux. we can use it as a gateway so that multiple machines in the Lan can use a public IP address to connect to the Internet. the method I use is to override the source address and target

NAT is generally divided into SNAT, DNAT, and PNAT. This article mainly describes how to configure NAT using iptables. Therefore, the differences between the three NAT methods and the application scenarios are briefly described as follows: the

124. *. * This ip segment is very disgusting, it is recommended to block # iptables-F # iptables-PINPUTACCEPT # iptables-POUTPUTACCEPT # iptables-PFORWARDACCEPT # iptables-AFORWARD-s124.115.0.0/24-jDROP # iptables on the server 124. 115. *. * This

Iptables-F # Allow packets from port 22 to enter iptables-AINPUT-ptcp -- dport22-jACCEPT # Allow packets from port 22 to return iptables-AOUTPUT-ptcp -- sport22-mstate -- stateESTABLISHED-jACCEPTiptables-AOUTPUT- pudp -- dp Iptables-F # Allow

Iptables is a common firewall software in Linux. it has complex commands and powerful functions. Used to forward and filter data packets. 1. functions of the firewall:. split the trust region or the untrusted Region B. restrict the services that can

VSFTP Virtual User configuration method 1. create a virtual user password library file to set the username for odd number lines, and set the password for even number lines # vi/etc/vsftpd/logins.txt www.2cto. commikepwabcdjohnpw12342. Generate the

Four common causes of SELinux warning this article describes four causes of SELinux warning and solutions. Www.2cto.com cause 1: The core concept of SELinux is labeling, whether it is a file system, directory, File, file startup descriptor... four

Fedora access to samba server error: & quot; you may not have permission to use network resources & quot; if you cannot access it when using Samba to create a Window to share with Linux, if you do not have the permission to use network resources,

ThissystemisnotregisteredwithRHN is prompted during online redhat system installation. 1. uninstall the redhat yum component www.2cto.com [root @ localhost ~]. # Rpm-qa | grepyum | xargsrpm-e -- nodeps2, download centos... When the redhat system is

Use the Shell script in Linux to switch the settings of Maven. xml File 1. Problem background www.2cto.com because there are separate maven configurations in the company and at home, you need to modify settings frequently. the activeProfile in xml

LINUXshell script introduction echoHelloworld! Equivalent to echo & amp; #39; Helloworld! & Amp; #39; but not equivalent to echo & quot; Helloworld! & Quot ;(! When placed in double quotation marks, escape \) www.2cto.com simple judgment example 1 #!

Linux system resources to view the system www.2cto.com # uname-a # View kernel/operating system/CPU information # head-n1/etc/issue # view the operating system version # cat/proc/cpuinfo # View CPU information # hostname # View Computer Name #...

The principle of configuring rsa login authentication in Linuxsshserver: The key is equivalent to a key, and the public key is equivalent to a door lock. of course, we use the key to unlock it. in the same way, we store the key on the local server,

This article describes the advantages and disadvantages of three Linux server monitoring technologies, including SNMP proxy (client), SSH, and private proxy (client) installation. The powerful functions and beautiful interfaces of the Linux system

Log on to the remote host directly through ssh-kengen without entering the password. 1. log on to machine A www.2cto. com2, ssh-keygen-t [rsa | dsa], the key file and private key file id_rsa, id_rsa.pub or id_dsa, id_dsa.pub3 will be generated. copy

Ubuntu install freetype error handling configure: creating./config. statusconfig. status: creatingunix-cc.mkconfig.status: creatingunix-def.mkconfig.status: creatingfreetype-confi Error handling of freetype installation in ubuntu12.04 configure: