Programmer Group

Talking about the network in Linux Connectivity between namespace s Namespace is a feature supported after Linux 2.6.x kernel, which is mainly used for resource isolation. With namespace, a Linux system can abstract multiple network subsystems. Each subsystem has its own network device, protocol stack, etc., which do not affect each other. ...

1: rbd introduction A block is a sequence of bytes (for example, a 512 byte block of data). Block based storage interface is the most commonly used method to store data using rotating media (such as hard disk, CD, floppy disk or even traditional 9-track tape). The ubiquitous block device interface makes the virtual block device an ideal candi ...

I. concept of progress bar The progress bar is the real-time display of the processing speed, completion, the size of the remaining unfinished tasks and the time that may need to be processed in the form of pictures when the computer is processing the tasks, generally in the form of rectangular bars. Several elements of progr ...

1: Introduction before installation A Ceph (CephFS) file system requires at least two RADOS pools, one for data and one for metadata. When configuring these pools, we should consider the following three points Use a higher level of replication for the metadata pool, because any data loss in this pool may render the entire file system inacces ...

Written in front In the last article, I recorded the driver of Kinect2 installed in Ubuntu and the bridge running in ROS. Now I can't wait to run the RGB-D interface under ORB-SLAM2. Modify ORB-SLAM2 After installing the Kinect2 driver, execute: roslaunch kinect_bridge kinect_bridge.launch Then execute the following comm ...

Helm-v3 Application Package Manager 3.1 Why do I need Helm?The application objects on K8S consist of specific resource descriptions, including deployment, service, and so on.Save each file or write it together to a configuration file.Then deploy kubectl apply-f. Why use helm?In k8s, when we deploy applications, we usually use yaml files to man ...

Machine preparation Two independent linux hosts with IP of 172.31.175.142/143 172.31.175.142 NameServer1, Broker Master1 172.31.175.143 NameServer2, Broker Master2 Installation configuration install Download the binary version and extract it wget http://mirrors.hust.edu.cn/apache/rocketmq/4.3.0/rocketmq-all-4.3.0-bin-r ...

Replace yum warehouse source cp -r /etc/yum.repos.d/ /etc/yum.repos.d.bak 񖓿 configuration of warehouse source of backup system rm -f /etc/yum.repos.d / * ා delete all warehouse source configurations cd /etc/yum.repos.d / ා enter the warehouse source directory wget http://mirrors.163.com/.help/CentOS7-Base-163.repo(wget installation: yum insta ...

Author: Chen Yi preface This article briefly introduces some tips of "MySQL client" often used in operation and maintenance. These tips will not be used by non professional DBAs. Professional DBAs are necessary. I hope you can use my share. The built-in commands of MySQL client are as follows, and we will explore 6 of them: List of ...

Raspberry Pie Compile Install LANMP brief introduction My raspberry pie here is 3 B Edition, CPU4 Kernel, memory 1 G，System I use is Ubuntu 19.10 Edition.The mirror uses Ali's mirror with the following source: deb https://mirrors.aliyun.com/ubuntu-ports eoan main restricted deb https://mirrors.aliyun.com/ubuntu-ports eoan-updates main rest ...