Interface-based plug-in mechanism

First, the preface plug-in, which means extensible, and the host program does not depend on the plug-in, plug-and-play. This software design method can maximize the scalability, adaptability and stability of our application, and facilitate the maintenance and upgrade of the software. In what scenarios do you use plug-ins? For example, in this article

Domain control-client folder empowerment

Computer Policy-computer configuration-Policy-Windows Settings-full Settings-File system right-click the file system-add files-join the domain user group and set permissions.

Cisco switch password forgot to reset

Cisco switch, what if we forget its login password? How to clear its password? Principle: enter the bottom layer of the switch, change the name of the original configuration file of the switch, and restart the switch. If the switch cannot find the original configuration file, it will load the default system file (that is, the switch shipped from the factory).

Sniffer packet capture analysis

Grab packet analysis native IP address: 192.168.2.93FTP server: 192.168.2.212TCP connection (three-way handshake) TCP first handshake: 192.168.2.93 send a request connection (SYN=) to 192.168.2.212

Pointer 150206204

# includeint main () {int * ptr; / / declares an int pointer int val = 1; / / declares an int value ptr = & val; / / assigns an int reference int de to the pointer

IPUBO Multiplexing-epoll

Epoll is a unique Ithumb O reuse function of Linux, which is very different from select and poll in implementation and use. Epoll uses a set of functions to accomplish tasks, rather than individual functions. Epoll puts the events on the file descriptor that the user cares about in one of the kernel

Common categories of icmp

Recently, a friend asked me what I mean in writing iptables, as follows:-An INPUT-p icmp- m icmp--icmp-type 8-m limit-- limit 2/sec-j ACCEP

Zabbix Monitoring Printer

Note: the printer is the most frequently used equipment in the office, such as our company, changing the toner cartridge once a day is simply eating ink, and every time a colleague calls to tell us that there is no ink, and then someone on our side will change it. Compare and affect work efficiency. Accidentally found that the company printer also supports S

Spring Data JPA simple query

1. Interface method sorting out the following table needle for simple queries, that is, the accessible methods in JpaRepository interface (inheriting CrudRepository interface and PagingAndSortingRepository interface) are sorted out. (1)

Some simple algorithms in C language

1. Swap the contents of array A with the contents of array B. (the array is the same size) void swap (int * a, int * b) {int ten = 0 * ten = * a * politics a = * b politics b = ten;} int m

Centos7.2 install john-1.8.0

System environment: CentOS Linux release 7.2.1511john version: john-1.8.0 official website: http://www.openwall.com/john/ installation: wget http://

Ssh tunneling

Ssh tunnel technology is mainly used: the tunnel is often disconnected automatically: the tunnel may be disconnected for some reasons, such as machine restart, no data communication for a long time, being cut off by the router and so on. OpenSSH for security reasons, if the user is idle after connecting to SSH Server

The authentication principle of SSL and the creation of CA self-certification certificate using openssl

How to make self-authentication certificate secure transmission between general networks is inseparable from the application of SSL,SSL represents the [public key encryption (PKI)] technology. To put it simply, using public key encryption, each transmission process requires two keys, that is, the provider of encryption key and unsecret key data, that is, the data.

How to use the ping command to detect network problems?

Ping command can be said to be one of the most commonly used command line tools in network management. Ping can be used to diagnose network problems very quickly. Today, I'm going to teach you how to use ping to detect network problems. When the network is too slow to connect, follow these steps to execute the ping command

Using LAN Section function of VMware Workstation 11 to construct Intranet Environment

Originally, the host only mode is used to construct the intranet environment, but the virtual machine can not access the external network, but in fact, the host can still connect to this network segment, which can not well simulate the real environment. Later, someone told me a way to remove the check box hook so that the host could not access the network segment, but this

2-Huawei Firewall: security Policy Classification

First, experimental topology: second, experimental requirements: only one host or scope can be defined in ASA, and SRG can define host and scope at the same time; from virtual firewall to physical firewall is also Inbound, Huawei management firewall is Cisco's management sub-firewall; third, command deployment: 1

F5 automatically runs the script

Crontab-e add script path 00 3 * / var/tmp/run.sh (absolute path!) Just save it with wq

Daily script

1) combine / var/log/secure file to block N=3SEC_FILE=/var/log/securefor ip in `grep "Failed password" for IP with ssh login failures greater than N

9.EVE-NG accommodates H3C, Huawei, and swallows GNS3

Article list (follow Wechat official account EmulatedLab, timely access to articles and download links) 1, EVE-NG introduction (the best simulator for EVE-NG, the era of simulation environment is coming! ) 2. Introduction to EVE-NG installation process. 3. Import EVE-NG into Dyna

Collation of basic knowledge of computer network

Computer network: use communication equipment and lines to connect multiple computers in different geographical locations and operate relatively independently, and configure corresponding systems and application software. the function of a system computer network that realizes the functions of software and hardware resource sharing and information transmission between independent computers: data communication.