Cloud Applications

In Linux/Unix-like systems, you can use top to view system resources, processes, memory usage, and other information. To view the network status, you can use tools such as netstat and nmap. To view real-time network traffic and monitor TCP/IP

In the context of the mobile Internet, traffic testing is a very necessary terminal test in the age of waste of money. Lisa recently used the blank time to conduct research on android traffic testing. There are many methods to do this, and the

Implementation principle of packet capture in linux 1. tcpdump is a good tool for tracking the system behavior of processes in the local machine. in the debugging of network problems, tcpdump is an essential tool. like most excellent linux tools,

Iptables makes the security settings, first discards all INPUT and OUTPUT directions, and then enables the ports to be used one by one. it is found that the software cannot be installed using yum, make sure that the following rules are available

Tcpdump adopts the command line method. its command format is: tcpdump [-adeflnNOpqStvx] [-c quantity] [-F file name] [-I network interface] [-r file name] [-ssnaplen] [-T type] [-w file name] [expression] 1. introduction to tcpdump options-a

You may know how to set it, but record the solution. Just look at the last three lines. To test the epoll performance of javamustang (jdk1.6), Tim recently wrote a JavaNIO client to connect to the server in Linux, in principle, a client can open 6553

After CentOS is installed, only port 22 is enabled by default. if you want to open other ports, you need to open the required ports. For example, open the default port 80 for http edit iptablesvi/etc/sysconfig/iptables

Php5.3 + syntax is required for recent projects. Since 5.4 is out, install 5.4. However, the latest official projects require php5.3 + syntax. Since 5.4 is out, install 5.4. Helpless official sources. You can use PPA to install it. The installation

I personally prefer to compile and install the server environment,... Some VPS may have some problems without gcc or the gcc version is very low, so you will not be able to enjoy the program that requires cmake (for example, Apache2.4.3, Mariadb5.5.3

1. modify the configuration file/etc/services (vi/etc/services) and add it to the row: mountd925/tcp # mountd process (you can change 925 to another available port) mountd925/udp2: modify the iptables configuration file/etc/sysconfig/iptables

Abstract: This article is a companion article on "using iptales to implement a packet-over-firewall". it mainly introduces how to use iptbales to implement powerful nat functions under linux2.4. For more information about the syntax of iptables, see

Iptables is also used when you install the server. you don't have to worry about it. when you use it, you can find that iptables has many things to learn, such as opening up the ftp service. The default policy of the INPUT chain of the iptables

PS: This iptables script is good and practical. you can use it as needed. For your reference. Original author alias name. Source #! /Bin/sh # modprobeipt_MASQUERADEmodprobeip_conntrack_ftpmodprobeip_nat_ftpiptables-Fiptables-tnat-Fipta PS:

/Usr/local/sbin/iptables-PINPUTACCEPT/usr/local/sbin/iptables-PFORWARDACCEPT/usr/local/sbin/iptables-POUTPUTACCEPT # resetthedefaultpoliciesinthenattable. #/usr/l/usr/local/sbin/ Iptables-P input accept/usr/local/sbin/ Iptables-P FORWARD ACCEPT

The openVPN service previously deployed on Linode was closed after I migrated the instance to Tokyo. After that, I spent some time re-configuring it, but there was still a connection problem and I still could not access the Internet (Editor's note:

In linux, iptables is used to limit traffic, which is simple and practical. You can use the following script to configure the machine as a gateway. 1. configure iptables forwarding (omitted) 2. speed limit script vi/root/xiansu. sh #! /Bin/bash/sbin/

/* In general, the two network interfaces of the firewall should belong to two different networks. data packets are forwarded or rejected or discarded between the two interfaces according to the access rules defined by the system administrator. In

The principles of IPtables and common parameters of iptables are described in the previous two articles. I will use examples to illustrate common iptables configurations. These configurations can be directly used in the production environment after

By default, the new CentOS6 does not contain the xfce desktop environment. these packages cannot be found using yum, but you like this simple desktop environment, in this case, you can use the following method to install $ wgethttp: // container on

During the weekend, QT was installed in the LinuxCentOS system. it took two days to complete the installation .... record the ups and downs .... my system is CenttOS5.5 specific installation method: 1. download Qt4.5.3forX11OpenSource here. 2.