Programmer Think

Install software programs 0 summary linux, package management system (PMS), and command line tools for software installation, management and deletion. How to use the software package management system (PMS) to install, update or delete software at the command line. Although most Linux distributions use beautiful GUI tools for package man ...

squid forward agent Principle: a machine that can't access the Internet can access the website that can't be accessed through the agent Here I use my real machine as an agent. The virtual machine accesses the website through the agent Operating System: Red Hat Enterprise Linux Server 7.2 (Maipo) squid installation a ...

During the experiment, several virtual machines (minimum installation) need to be opened to mount the image directly to configure the yum source, without copying the iso to the virtual machine, so as to reduce the disk occupation; Check whether the virtual machine mounts the image Check whether the mount directory is mounted C ...

dig Di is a DNS query tool, most administrators will use the dig command to solve DNS problems. The scope of application of this command: Red Hat, RHEL, Ubuntu, CentOS, Fedora. 1. Grammar dig [option] 2. List of parameters @server Specify server address -b host Specify which host to query through -f file Qu ...

C/C++:sizeof arrays and pointers Using sizeof in C/C++ yields different results for arrays and pointers. [example 1] #include <stdio.h> #include <stdlib.h> #define SAFE_FREE(p) {free(p);p=NULL;} int main() { char arr[20]; char *p = (char *)malloc(sizeof(char) * 20); printf("sizeof arr :%d\n", sizeof(arr)); prin ...

        Because of the new network card name naming method used in RHEL7, it is difficult to understand and remember the network card name. This paper introduces how to modify the network card name to the traditional eth0 naming method to define any network card as eth0.Introducing the process of network ...

As a reverse proxy and load balancing server, nginx must be highly available, so it supports hot deployment.The hot deployment of nginx is closely related to its concurrency model.To put it plainly, it's because of the master process.When ngnix is notified to re-read the configuration file, the master process makes grammatical errors.If there ...