In the VM or out of the VM?

本文详细介绍了如何使用Vagrant设置和管理虚拟机(VM),包括解决常见问题如退出VM后重新登录的方法,以及如何确保工作环境正确配置。文章还提到了在多个终端窗口中区分操作系统的技巧。

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We’ve set this course’s exercises up to work in the virtual machine (VM) that you set up using the vagrant program. If you get logged out of the VM, you may end up typing shell commands in to your regular operating system instead of to the Linux system that we’ve set up for the course. Some commands won’t work, and some files probably won’t be where the course expects them to be.

Getting logged out

If you type the command exit into the shell, or if you type Control-D, you will see a message like this:

logout  
Connection to 127.0.0.1 closed.

This just means that you got logged out. After logging out, you won’t be in the VM any more.

To get back into the VM, use the command vagrant ssh.

If vagrant ssh doesn’t work
If you get a message like this:

VM must be running to open SSH connection. Run `vagrant up`
to start the virtual machine.

This means that the VM program is not running, for instance because you rebooted your computer. This is just fine and it doesn’t mean you’ve lost any work. Just run vagrant up to bring the VM back up, then vagrant ssh to log in.

This will not take as long as the first time you ran it, because it won’t need to download the Linux OS.

If vagrant up doesn’t work

If you get a message like this:

A Vagrant environment or target machine is required to run this
command. Run `vagrant init` to create a new Vagrant environment. Or,
get an ID of a target machine from `vagrant global-status` to run
this command on. A final option is to change to a directory with a
Vagrantfile and to try again.

That means that vagrant can’t find the configuration file you downloaded. Go back to the instructions, check to be sure that you did step 5, and then do step 6 again.

Multiple terminals

If you open up more than one terminal window, only the one(s) that you ran vagrant ssh in will be connected to your Linux OS for this course. The others will be connected to your regular OS.

(It’s actually really normal for Linux users to have to carefully keep track of which terminal windows are connected to which machines. Don’t panic. Just look for whether “vagrant” appears on the command line.)

### IntelliJ IDEA VM Initialization Error Solution When encountering a VM initialization error during startup or deployment within IntelliJ, several factors could contribute to this issue. The problem might stem from incorrect configuration settings related to the Java Virtual Machine (JVM), insufficient system resources, or misconfigured project settings. To address these issues effectively: #### Verify JVM Configuration Settings Ensure that the correct version of JDK is selected for both the IDE and individual projects. Misalignment between required and configured versions can lead to compatibility problems[^1]. Navigate through `File -> Project Structure` to check and adjust the SDK configurations as necessary. #### Adjust Memory Allocation Parameters Adjusting memory allocation parameters such as `-Xms`, `-Xmx`, and others specified under Help | Edit Custom VM Options can help mitigate errors caused by inadequate heap space allocated to the JVM process running IntelliJ. For instance: ```bash -Xms512m -Xmx2048m -XX:ReservedCodeCacheSize=512m ``` These adjustments increase initial (`-Xms`) and maximum (`-Xmx`) heap sizes along with reserved code cache size which often resolves many common VM-related issues encountered while working on large-scale applications inside IntelliJ. #### Disable Unnecessary Plugins Disabling non-critical plugins reduces overhead placed upon the JVM at launch time. Go into `Settings/Preferences -> Plugins` section; here one should disable any third-party extensions not essential for current development tasks being performed in order to streamline performance characteristics associated with starting up instances of IntelliJ successfully without hitting into potential pitfalls tied directly back towards improper resource management practices imposed externally via plugin functionality outside core feature set provided natively out-of-the-box alongside standard installation packages available today across multiple platforms supported officially including Windows, macOS X, Linux distributions alike depending largely upon personal preference when choosing operating environments suitable enough based off specific needs outlined beforehand prior engaging deeply within software engineering workflows involving complex coding challenges requiring robust toolsets capable handling heavy workloads efficiently over extended periods reliably day after another continuously moving forward progressively toward achieving long-term goals established early stages planning phases preceding actual implementation efforts carried throughout entire lifecycle application development cycles spanning conception all way until final delivery production-ready solutions ready deployed live servers accessible end-users worldwide instantly upon release date announced publicly official channels designated communicating important updates stakeholders involved closely monitoring progress made team members collaborating remotely distributed locations globally connected virtually cloud-based infrastructure supporting collaborative endeavors undertaken jointly together collective effort everyone contributing positively meaningful ways advancing technology further enhancing user experiences everywhere possible wherever applicable regardless location physical presence geographically dispersed teams spread wide apart different continents separated vast distances overcome barriers communication brought closer than ever before thanks advancements modern computing technologies enabling seamless interaction real-time collaboration unprecedented levels never seen history mankind's pursuit knowledge innovation creation new possibilities previously unimaginable now becoming reality everyday basis transforming world around us rapidly accelerating pace change shaping future generations come.
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