Programmer Group

[toc] preface Every time we execute rm commands on the production environment server, we are always on the edge of our pants, because once we accidentally execute the error deletion, we will be ready to run. After all, people are not machines, let alone machines have bug s, hehe. So what if you really delete files that should not be deleted, su ...

Background: With the business iteration, some projects are reconstructed with nodejs and deployed to k8s environment. In order to facilitate analysis, the last version of the code increases the function of output log. Phenomenon: Half a day after the launch, it was found that there was an alarm of too many open files in the R & D feedback ...

1. Installation services: [server1] [root@server1 yum.repos.d]# yum install salt-master-* [root@server1 salt]# ls cloud cloud.maps.d master minion.d proxy.d cloud.conf.d cloud.profiles.d master.d pki roster cloud.deploy.d cloud.providers.d minion proxy [root@server1 salt]# /etc/init.d/salt ...

psutil introduction psutil is a cross platform library( http://code.google.com/p/psutil/ )It can easily obtain the process and system utilization (including CPU, memory, disk, network, etc.) information of the system. It is mainly used in system monitoring, analysis and limitation of system resources and process management. It implements the ...

Containers are great for encapsulating software, but sometimes you can go too far by blindly altering the container image to make it as small as possible. We need to find a good balance between "clean" images and images that cannot be debugged. The normal way to see people debugging a running container is to docker exec - it $containe ...

server information System: CentOS 6.5 minimal version Host: Virtual Machine Virtual Machine IP: 192.168.128.128/24 Host IP:10.1.79.24/24 Install postfix Note: CentOS 7 has actually replaced sendmail with postfix+Sasl2, so there is no need to install it. 1. Remove sendmail Installation completed also requires replacing the sendmail that ...

When Swoole Meets ThinkPHP5: Hello,World! This article assumes that you already have a PHP environment for the Linux operating system. It is highly recommended that you use Vagrant to build a development environment. Install Swoole PECL Extension Swoole can be installed either by pecl command or by compiling and installing source packages. Thi ...

Causes: Our program needs to pull files from the file server (across the computer room). The machines running the program are telecommunications, interconnection and mobile lines, and three IP lines are assumed to be 01_DX_IP, 01_LT_IP, 01_YD_IP File servers are also telecommunications, unicom, Mobile 3 lines, 3 IP 02_DX_IP, 02_LT_IP, 02_ ...

This time I'm talking about something about the external command grep on the bash command line. History 1 grep was originally used for Unix Operating system command line Tools. In giving a list of files or Standard input Later, grep matches one or more regular expression Text is searched and only matched (or mismatched) lines or text are outpu ...

*** Documents can not be uninstalled [root@gfsd1 mnt]# umount 20170228_Mustang_V5R1_SP1/ umount: /mnt/20170228_Mustang_V5R1_SP1: target is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) [root@gfsd1 mnt]# Solution *** Find the processes and commands that use this file, a ...