Programmer Group

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 ...

Dynamically update Linux system password and send SMS to remind Sometimes we may need higher security. As the mainstream operating system of the server, Linux needs to change the root password of the system account frequently to ensure the security of the whole system. The importance of the password i ...

0. Preface It's been a while since I left my job. The epidemic hasn't passed yet. If I can't go out, I still don't go out. I feel like I've been living a long time every day. I haven't found a job yet. I'm just looking for LDD3 recently. I transplanted the AR8031 driver from my previous job. I just to ...

Using asynchronous notification in the device driver can make the driver inform the user program to access the device. In this way, applications using non blocking I/O do not need polling mechanism to query whether the device is accessible, and blocking access can also be replaced by asynchronous not ...

1, Last course review 2, Linux basic command 3 2.1 users and user groups 2.2. Use of personal environment variables (. Selection of bashrc and. Bash? Profile) and global environment variables (/ etc/profile) and aliases 2.3 use of history command 2.4 use of delete command Three. Homework 1, Last cour ...

Extras: Why did you insist on using k8s to realize the existing business? There is a strong impetus that the original virtual deployment of elastic cluster can no longer adapt to the expansion of business scale. It is nightmarish to set up large-scale elastic cluster on virtual machine. Therefore, we are determined to deploy in a container way ...

Before I wrote this article, I was afraid of the interprocess communication of linux. However, after reading some other articles, I found that the interprocess communication of linux is much more difficult than what I learned. First of all, the concept of thread under linux has been weakened. Thread ...

ELk introduction E: Elasticsearch stores data java 50: Logstash collection, filtering, forwarding, matching, large, slow start, middle role java K: Kibana filtering, analysis, graphic presentation java F: Filebeat collects logs and filters go Basic architecture diagram Traditional log analysis requirements (interview) 1. Find out the top ten ...

NMI interrupt of CPU is often used as Hard lock detection. Whether the CPU is locked or not, the hardware should always ensure that the NMI interrupt can be responded. As a method of Hard lock detection, when the CPU hardware is locked, its clock interrupt may not be responded, resulting in the clock ...

Case 1: configure MySQL multiple instances 1.1 problem On the host 192.168.4.56, configure the first MySQL instance Instance name mysql1, port 3307 Database directory / data3307, PID file mysql1.pid Error log mysql1.err On the host 192.168.4.56, configure the second MySQL instance Instance name mys ...