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Technical Articles

Operation and Maintenance

Solution to the problem that SSH cannot connect to Ubuntu Linux in the virtual machine

Today I used SSH to connect to the Linux system in the virtual machine under Windows XP, but it never connected. People are depressed. Later I searched a lot online. well. Installed ftp, SSH, smb. None of them were successful. Later it finally succeeded. First of all: the system is Ubuntu, the virtual machine VMware simplified Chinese version, 20M. It runs extremely fast in a virtual machine. 1. First change the vmare connection to a bridge connection. Select Bridge in Network Adapters in the virtual machine settings. 2. Turn off the hardware verification of the network card in the local connection. The hardware checksum value in the properties is off. 3. In the Linux terminal: ifconfig checks the virtual machine IP. Then whether the virtual IP can be pinged under xp

Jan 07, 2024 pm 02:45 PM

Linux Ubuntu ssh

Libral provides a unified management API for system resources and services!

Introduction As a traditional Linux operating system that inherits Unix, it does not have a comprehensive system management API interface. On the contrary, management operations are implemented through a variety of specific-purpose tools and APIs, each of which has its own conventions and unique features. style of. This makes writing scripts for even simple system administration tasks difficult and fragile. For example, to change the login shell of user "app" run usermod-s/sbin/nologinapp. This command usually works fine, just not when there is no "app" user on the system. To solve this exception error, an innovative script writer might write: grep-qapp/etc/

Jan 07, 2024 am 11:22 AM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

Install Apache Hadoop on CentOS!

Introduction The Apache Hadoop software library is a framework that allows distributed processing of large data sets on a computer cluster using a simple programming model. Apache™ Hadoop® is open source software for reliable, scalable, distributed computing. The project includes the following modules: HadoopCommon: a common tool that supports other Hadoop modules. Hadoop Distributed File System (HDFS™): A distributed file system that provides support for high-throughput access to application data. HadoopYARN: Job scheduling and cluster resource management framework. HadoopMapReduce: A YARN-based parallel processing system for large data sets. This article will help you step by step in

Jan 07, 2024 am 09:14 AM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

How to remotely manage the server using deepin20 terminal

The Linux system is mainly used for servers. As operation and maintenance personnel, you have to log in to the server through ssh every day for server management. It will be troublesome to enter the ssh command every time. The terminal interface of deepin20 provides the function of ssh remote management of the server. Let's take a look at it below. See detailed tutorial. 1. Click the launcher on the taskbar, find and click to open the terminal. 2. Click the menu button in the upper right corner of the terminal and click [Remote Management] in the drop-down menu. 3. Then click [Add Server]. 4. Set the IP address and port number of the ssh server, as well as the login user name and password. If using a certificate, click the [Certificate] column to add a certificate. If you want to manage multiple servers at the same time, set the [Server Name] Attention and other services

Jan 06, 2024 pm 09:22 PM

服务器 deepin deepin20

Solve the problem that virtualbox cannot open the virtual machine and the solution that Linux cannot access virtualbox

I installed a virtual machine on a deepinlinux physical machine with the help of virtualbox, but the virtual machine cannot be directly accessed on the physical machine (deepinlinux system). What should I do? Let’s take a look at the solution to this problem. The IP address of the virtual machine is 10.0.2.15, as shown in the figure below. On the physical machine (deepinlinux system), the direct ssh connection cannot be accessed normally (the openssh-server service has been installed), and it keeps getting stuck without any response. To solve the above problem, first run virtualbox, click "Management" and select "Global Settings". pop-up

Jan 06, 2024 pm 03:28 PM

Linux 虚拟机

In-depth analysis of the systemd management system under CentOS 7

CentOS system startup process: POST-->BootSequence-->Bootloader-->kernel+initramfs(initrd)-->rootfs-->/sbin/initinnit program: CentOS5: SysVinitCetnOS6:UpstartCentOS7:SystemdSystemd new features: system SysVinit and LSBinitscripts Implement parallel startup of services when compatible system boots; use socket/D-Busactivation and other technologies to start services; in order to reduce system startup

Jan 06, 2024 am 08:53 AM

centos7 systemd

Use Ansible to automate the deployment of serverless applications

Introduction Ansible is designed to be the simplest deployment tool for practical work. This means it is not a complete programming language. You need to write a YAML template that defines the tasks and lists any tasks that need to be automated. Most people think of Ansible as a more powerful "SSH in a for loop", and in simple use cases this is true. But in fact, Ansible is a task, not SSH. In many cases we connect via SSH, but it also supports Windows Remote Management (WinRM) on Windows machines, and things like HTTPS API as a common language for cloud services. In the cloud, Ansible can operate on two independent levels

Jan 05, 2024 pm 11:44 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

How to remotely verify SSH service configuration and policy through ssh_scan

Introduction ssh_scan is an easy-to-use SSH service parameter configuration and policy scanner program for Linux and UNIX servers. Its ideas come from the Mozilla OpenSSH Security Guide. This guide provides a reliable security policy baseline recommendation for SSH service parameter configuration, such as Encryption algorithms (Ciphers), message authentication information code algorithms (MAC), key exchange algorithms (KexAlgos) and others. ssh_scan has the following benefits: its dependencies are minimized. ssh_scan only introduces local Ruby and BinData to perform its work, without too many dependencies. It is portable, you can use ssh_scan in other projects

Jan 05, 2024 pm 11:12 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

How to change Ubuntu's apt-get update source?

Manually modify Ubuntu's apt-get source 1. Use the ssh tool to connect to Ubuntu (I use xshell) 2. Type cd/etc/apt/3 on the command line and back up the source.list file in this directory (you must have sudo permissions) ), then there is a source.list.bak file. 4. Clear the source.list file content (note: it cannot be restored after clearing, so you need to perform the previous step to back up the file in advance). At this time, use sudo to prompt that the permissions are insufficient. Switch directly to the root user and execute this command. 5. Use vim to open source.list, press the i key to enter the editing mode, paste the source address to be modified, and then press

Jan 05, 2024 pm 03:40 PM

Ubuntu get apt 源

Steps to install Greenplum 4.3.5.2 on CentOS 6.6

On the GP official website, I can't see the corresponding version of the latest GP on Centos, so just use the RedHat version. Foreword: The installation of GP is roughly as follows. Select one host as the Master machine and the others as Segment machines. Since there are not that many machines, I opened three centos6.6 virtual machines in 1+2 mode. When installing, remember that GP can be installed on the Master machine first, and then you can perform similar remote installations by establishing mutual trust (gpssh-exkeys) between the Master machine and the Segment machine. You can log in to all machines through gpssh and perform what you want. This includes creating a user, copying the installed GP, and a series of other operations. Of course, in An

Jan 04, 2024 pm 09:48 PM

centos6.6 GreenPlum

Introducing automatic logout methods on Linux to prevent long periods of user inactivity

Let's imagine this scenario. You have a server that is frequently accessed by many users from various systems on the network. It is possible that some users forget to log out of the session leaving the session open. We all know how dangerous it is to leave a user session connected. Some users may use this to intentionally do things that damage the system. And you, as a system administrator, will you go to every system to check whether the user has logged out? In fact, this is completely unnecessary. And if there are hundreds or thousands of machines in the network, this is too time-consuming. However, you can have users automatically log out if they are inactive on the machine or SSH session for a certain period of time. This tutorial will teach you how to do this on a Unix-like system. not at all

Jan 04, 2024 pm 04:38 PM

Linux 用户

How to change the host name in Ubuntu 15.04? Ubuntu, how to change the host name in 15.04

1. Temporary modification; root@ubuntu15:/#hostnameXXXX so that the host name is temporarily modified to XXXX, but the effective host name will not be immediately displayed in the terminal. Re-open a terminal window (the terminal connected through ssh needs to be reconnected) Yes), in this way, the new host name is not saved in the system, and the host name will be restored to the original host name after the system is restarted. 2. Permanent modification: Directly edit the content of /etc/hostname as follows: XXXX The host name is changed to XXXX after restarting, and it remains unchanged after restarting. How to modify the host name on CentOS or RHEL7: https://www.jb51.net/os/RedHat/

Jan 04, 2024 am 11:22 AM

主机名

Teach you how to execute Java jar package in Linux system

Introduction to the method of running jar packages under Linux. When you need to use a Java program developed on Windows to run on Linux, you need to package the Java program into a jar package and upload it to Linux for running. The following content will introduce several A method to start jar packages in the background under Linux. Optimization method one: java-jarxxx.jar&& means running in the background, the ssh window is not locked, but when the window is closed, the program will still exit Optimization method two: nohupjava-jarxxx.jar&nohup means running the command line without hanging up, when the account exits or is closed Terminal, program still runs when executing job with nohup command

Jan 04, 2024 am 10:24 AM

Linux jar 怎么运行jar包

20 essential commands for system administrators

Introduction In this booming environment of new tools and diverse development environments, it is necessary for any developer and engineer to learn some basic system management commands. Specific commands and toolkits help developers organize, troubleshoot, and optimize their applications, while also providing operators and system administrators with valuable triage information when errors occur. Whether you are a novice developer or looking to manage your own applications, the following 20 basic system administration commands can help you better understand your applications. They can also help troubleshoot system failures such as why an application works locally but not on a remote host. These commands apply to Linux development environments, containers, and virtual machines. 1.curlc

Jan 04, 2024 am 09:05 AM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频