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Technical Articles

Operation and Maintenance

Guide to Configuring and Installing Windows Operating Systems in KVM for Ubuntu

Why bother with KVM virtual machines? Recently, due to company affairs, I don’t have much time to write, so I will use a technical article to make up for it. The thing is, our company has a small thing that is developed based on an embedded system and does not belong to the Android or iOS platform. Well, what does this mean? This means that the language used to develop this little thing is C language, not Java, Objective-C or Swift. So we need a CrossCompiler, also known as a cross-compilation environment, to compile this code. In fact, the iOSApp compiled by Xcode also belongs to the category of cross-compilation. However, this cross-compilation environment only has Windows platform

Dec 31, 2023 am 09:57 AM

Windows Ubuntu KVM

Setting up remote access to your Ubuntu system

Introduction Ubuntu system is one of the Linux systems commonly used by enterprises and individuals. Due to good graphics support and good development tool support, programmers prefer Ubuntu series systems. Recently, I helped a friend's company solve a problem and used a virtual machine to create an Ubuntu test environment. I found that Ubuntu's default security level and remote tools were not set. Next, we will install the ssh service, and then enable root permissions (not recommended). System environment: Our system uses the virtual machine vmwareworkstations12 version + Ubuntu17.04 for experiments: Install the ssh service, check the network connectivity, upgrade the installation source (first (Required for first use) Install ssh service and start ss

Dec 31, 2023 am 08:43 AM

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

How to solve the telnet exit problem under CentOS

Recently, some CentOS users reported that after using telnet to connect, they found that it was a problem with Windows Firewall. However, after successfully connecting using the telnet command, they found that they could not log out. What should they do? The following editor will introduce to you the solution to the failure of telnet to log out under CentOS. . Let’s go and see it together! How to exit from Linux telnet 1.ctrl+]quit Telnet is often used to test whether the port is open normally. But there is a problem that everyone may encounter. After telnet enters a certain port, it cannot exit. There is no way. In order to continue testing, I have to close the DOS (or other) window and reopen another one. Here is a method, hold down ctrl+]

Dec 31, 2023 am 08:13 AM

CentOS telnet 退出失败

lxc exec: Explore its unique charm

Introduction Recently, I made several improvements to lxcexec. If you don't know it, let me introduce it, lxcexec is the client tool of LXD, which uses the LXD client api to communicate with the LXD daemon and execute various programs that the user wants to execute. Here is an example of what you can use: We One of the main goals of lxcexec is to make lxcexec similar to ssh, as it is the standard for running commands remotely, interactively or non-interactively. This makes it a little tricky to do lxcexec well. 1. Handle background tasks A long-standing problem is of course how to handle background tasks correctly. Here is an example of the problem on LXD2.7 instance: You can see that executing the task in the background will cause lxcexe

Dec 30, 2023 pm 05:25 PM

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

Set up mongodb on Linux operating system

Introduction MongoDB is a product between a relational database and a non-relational database. It is the most feature-rich among non-relational databases and is most like a relational database. The data structure it supports is very loose and is a bson format similar to json, so it can store more complex data types. The biggest feature of Mongo is that the query language it supports is very powerful. Its syntax is somewhat similar to an object-oriented query language. It can almost implement most functions similar to single-table queries in relational databases, and it also supports indexing of data. 1. Download the Linux installation package as shown below and place it in a local corner. Remember the location~ 2. Connect to your server sshroot@your IP//Enter and enter the password 3. Upload the installation package to another

Dec 30, 2023 pm 12:49 PM

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

Tips to change ssh connection port number in ubuntu

Under normal circumstances, open the ssh configuration file sudovim/etc/ssh/sshd_config and find the following line: Port22. Change the following 22 to the port number you want to set and then restart the ssh service sudoservicesshrestart. If you log in to ssh remotely and it prompts: noroutetohost, it should be the firewall. Configure the corresponding ports and set up the firewall and it will be ok. If you have not installed openssh-server, you can refer to the following steps. Note: If the port is modified remotely, in order to prevent SSH from being unable to connect remotely after modifying the port, we can make SSH work under 22 and the newly set port at the same time, and wait until the test can connect to new

Dec 29, 2023 am 08:50 AM

Ubuntu ssh 修改远程端口

6 ways to harden your Linux workstation security

Introduction As I said before, safety is like driving on the highway - anyone who drives slower than you is an idiot, and anyone who drives faster than you is a lunatic. The guidelines presented in this article are just a basic set of core safety rules. They are not comprehensive and do not replace experience, caution, and common sense. You should slightly adjust these suggestions to fit the context of your organization. Here are some necessary steps that every system administrator should take: 1. Always disable Firewire and Thunderbolt modules. 2. Check your firewall to make sure all inbound ports are filtered. 3. Make sure root mail is forwarded to the account you verified. 4. Set up an automatic update schedule for the operating system, or update reminder content. Additionally, you should also consider some of the best

Dec 29, 2023 am 08:44 AM

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

screen command usage

Screen is a very useful command that provides the ability to use multiple shell windows (sessions) from a single SSH session. When the session is detached or the network is interrupted, processes started in the screen session will still run and you can reconnect to the screen session at any time. screen is a very useful command that provides the ability to use multiple shell windows (sessions) from a single SSH session. ability. When the session is detached or the network is interrupted, processes started in the screen session will still run, and you can reconnect to the screen session at any time. This is also convenient if you want to run a persistent process or connect to a shell session from multiple locations. In this article, we will show how to use Linux

Dec 29, 2023 am 08:07 AM

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

Steps to install and set up GitLab on CentOS

GitLab uses Ruby on Rails, an open source version management system, to implement a self-hosted Git project warehouse that can access public or private projects through a web interface. It has similar functionality to Github, with the ability to browse source code and manage defects and comments. The installation can be carried out according to the online installation guide https://about.gitlab.com/downloads/#centos6 Login configuration Directly access the server address, such as http://192.169.1.22/, a login window will appear, the username and password are: Username :rootPassword:5iveL!feClick the navigation bar to create a new project

Dec 28, 2023 pm 03:07 PM

CentOS gitlab

How to use character interface and window mode in CentOS

In the CentOS interface switching problem, many people may be accustomed to entering the character working mode to operate. So how do you switch to character working? Below we will introduce 3 methods to enter the character working mode: Let’s take a look! Open a terminal window in a graphical environment to enter character working mode. Enter character working mode directly after system startup. Use remote login mode (Telnet or SSH) to enter character working mode. Virtual Console When the system enters the character working mode directly at startup, the system provides multiple (default is 6) virtual consoles. Each virtual console can be used independently without affecting each other. You can use Alt+F1~Alt+F6 to switch between multiple virtual consoles. If the user uses st

Dec 27, 2023 pm 04:48 PM

CentOS 字符界面窗口模式

The difference between console cable and network cable

The difference between console cable and network cable: 1. Definition and use; 2. Transmission rate; 3. Structure and material; 4. Interface type; 5. Application scenarios; 6. Security. Detailed introduction: 1. Definition and use. The console cable is a cable used to connect the computer host and network equipment. It is usually used to debug network equipment, such as routers, switches, etc. The network cable is a cable used to connect computers, switches, etc. Cables for routers and other equipment are used to implement network communication; 2. Transmission rate, the transmission rate of the Console line is usually higher, etc.

Dec 18, 2023 am 10:29 AM

console线网线

How to solve securefx connection failure

Solutions to the problem that securefx cannot connect: 1. Check the network connection; 2. Check the SecureFX configuration; 3. Update SecureFX; 4. Check the firewall settings; 5. Check the target server settings; 6. Check the log file; 7. Try to connect manually; 8 , contact technical support; 9. Check the certificate and encryption settings; 10. Try other connection methods; 11. Check the server documentation and support resources; 12. Consider upgrades or alternatives; 13. Be aware of security risks.

Dec 13, 2023 am 11:57 AM

securefx

What to do if securefx cannot connect?

Solutions to the problem that securefx cannot connect: 1. Check the network connection; 2. Check the SecureFX configuration; 3. Update SecureFX; 4. Check the firewall settings; 5. Check the target server settings; 6. Check the log file; 7. Try to connect manually; 8 , contact technical support; 9. Check certificate and encryption settings; 10. Check proxy settings; 11. Check software conflicts; 12. View documentation and support resources; 13. Consider upgrades or alternatives; 14. Pay attention to security risks.

Dec 13, 2023 am 11:45 AM

securefx

pycharm connection server tutorial

There are three steps for pycharm to connect to the server: "operation steps", "connection steps" and "code running": 1. Select "setting"->"Project:..."->"Python Interpreter" drop-down to select the created compilation environment; 2 , click "Tools" -> "Start SSH Session" and select the created connection; 3. Connect to the server and use pycharm to edit the code.

Dec 11, 2023 am 10:41 AM

pycharm连接服务器 pycharm