Programmer Help

Docker Docker installation 1. Uninstall old sudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine 2. Install the r ...

Environment variables often need to be configured during custom software installation. The following lists various configuration methods for environment variables. The environment of all the examples below is described as follows: System: Ubuntu 14.0 User name: uusama MySQL environment variable path needs to be configured: / home/uusama/mysql/ ...

preface Let's start directly. Non Web project deployment is very simple without complicated configuration 1, Modify pom.xml configuration file Let me take Maven as an example This is the case when my project is started locally. It is the same when the server is started after deployment. Stop it first. Open pom.xml, compare whethe ...

1, Makefile 1. What is Makefile There are countless source files in a project, which are placed in several directories according to type, function and module. Makefile file defines a series of rules to specify which files need to be compiled first, which files need to be compiled later, which files need to be recompiled, and even more complex f ...

1, Process creation and related functions 1. Process creation The system allows a process to create a new process. The new process is a sub process of the original process. The sub process can also create a new sub process to form a process tree structure model, and its related function is pid_t fork(void); The specific usage is as follows: /* ...

1. View disk IO performance   1.1 top command The top command judges the current disk IO performance by viewing the wa% value of the CPU. If this value is too large, it is likely that the disk IO is too high. Of course, it may also be due to other reasons, such as too high network io. The meanings of other parameters of the top command a ...

poll Like select, poll is also a ready event notification scheme. Poll has only one function, that is, waiting.Poll solves two select problems: there is no upper limit on the file descriptor that poll waits for.poll separates the input and output using variables. Therefore, each cycle does not need to be added again. Introduction to poll ...

Assembly language light LED To get a new chip, the first thing to do is to drive its GPIO and control its GPIO output high and low levels. GPIO port is one of the functions of IO port. 1, The next steps are inseparable from the chip Manual: 1. Enable all clocks and all clocks of GPIO 2.IO configuration, multiplexing GPIO 3. Set IO register Conf ...

docker container network Docker automatically provides three types of networks after installation, which can be viewed using the docker network ls command [root@localhost ~]# docker network ls NETWORK ID NAME DRIVER SCOPE 9692fae45042 bridge bridge local cd5368439dc0 host host local c49a1db81682 none ...

linux user management Basic user overview What are users Users refer to those who can log in to the linux system normally, such as users who log in to King glory and users who log in to QQ Why users 1. Each process (running program) on the system needs a specific user;2. In the company, ordinary users are usually used to manage th ...