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Cloud_Hosted_Oracle_VM.md

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Cloud hosted Oracle Virtual Machine

Oracle provides "Always free" ressources, including the creation of a free Virtual Machine:

  • Always Free Resources : "All tenancies get the first 3,000 OCPU hours and 18,000 GB hours per month for free for VM instances using the VM.Standard.A1.Flex shape, which has an Arm processor. For Always Free tenancies, this is equivalent to 4 OCPUs and 24 GB of memory."

Here's a great tutorial on how to get yours: How To Set Up and Run a (Really Powerful) Free Minecraft Server in the Cloud.

This article explains how to set up an Oracle VM for hosting a Minecraft server, but you can use it for anything you want.

Credit card information

Please note that you will have to provide your credit card information to access your "Always free" resources.

Even after the 30-day trial period, you will not be charged unless you choose to upgrade your plan, and you will still have access to your "Always Free" account.

"Out of capacity" error message

You will probably get an error message when creating your free VM on the Oracle dashboard, saying something like this:

  • "Out of capacity for shape VM.Standard.A1.Flex in availability domain AD-1. Create the instance in a different availability domain or try again later. If you specified a fault domain, try creating the instance without specifying a fault domain, otherwise try creating the instance in a different availability domain. If that doesn’t work, please try again later."

A workaround is to automate the click on the "Create" button. To do this, you can run this script in your browser's console:

// Open the home page in a new tab
win1 = window.open("https://cloud.oracle.com/");
var v = document.querySelector(".oui-savant__Panel--Footer > button:nth-child(1)");

// At every 30 seconds, reload the home page and click "Create"
timer1 = setInterval(() => {
    win1.location.reload();
    console.log("Refreshed");
    
    if (v && v.textContent == "Create") {
        v.click();
        console.log("!!! clicked");
    } 
    else {
        console.log("!!! no button");
    }
}, 30000)

Source : https://www.reddit.com/r/oraclecloud/comments/zf0tje/comment/la6qkaa/

  • It automatically clicks every 30 seconds.
  • It opens a new window to keep your session alive, so you don't log out.

Please note that this can take a while, it took me about 2 hours to get it working.

Reclaim 15GB of /var/oled

Source: https://www.reddit.com/r/oraclecloud/comments/ywwp41/reclaiming_10gb_varoled/

You can see that 15GB are completely unusable with lsblk:

[opc@your-machine ~]$ lsblk

NAME               MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sda                  8:0    0 46.6G  0 disk
├─sda1               8:1    0  100M  0 part /boot/efi
├─sda2               8:2    0    2G  0 part /boot
└─sda3               8:3    0 44.5G  0 part
  ├─ocivolume-root 252:0    0 29.5G  0 lvm  /
  └─ocivolume-oled 252:1    0   15G  0 lvm  /var/oled

To reclaim them, run:

  • sudo umount /var/oled
    • If "target is busy", run sudo dnf remove pcp before.
  • sudo dnf remove pcp
  • sudo umount /var/oled
  • sudo mkdir /var/oled/crash
  • sudo lvremove /dev/mapper/ocivolume-oled
  • sudo xfs_growfs -d /dev/mapper/ocivolume-root

Now run df -h /, you should have successfully reclaimed your 15GB:

[opc@your-machine ~]$ df -h /
Filesystem                  Size  Used Avail Use% Mounted on
/dev/mapper/ocivolume-root   45G   12G   34G  26% /

Then edit /etc/fstab:

  • sudo nano /etc/fstab
  • Remove the line containing "/var/oled", or add a # at the beggining to comment it out.

Firewall (with firewalld)

Open a port publicly:

  • Open a port (TCP and UDP): 
    sudo firewall-cmd --permanent --zone=public --add-port=25565/tcp

sudo firewall-cmd --permanent --zone=public --add-port=25565/udp
  • Cancel: 
    sudo firewall-cmd --permanent --zone=public --remove-port=25565/tcp

sudo firewall-cmd --permanent --zone=public --remove-port=25565/udp
  • See all open ports: 
    sudo firewall-cmd --zone=public --list-ports

Reject an IP adress:

  • Apply : 
    sudo firewall-cmd --permanent --add-rich-rule="rule family='ipv4' source address='51.15.34.47' reject"
  • Cancel : 
    sudo firewall-cmd --permanent --remove-rich-rule="rule family='ipv4' source address='51.15.34.47' reject"

    This is a real abusing IP example: https://www.abuseipdb.com/check/51.15.34.47

Reload (REQUIRED):

sudo firewall-cmd --reload

Firewall status:

  • Check if firewalld is active: 
    sudo systemctl status firewalld
  • Get firewalld config: 
    sudo firewall-cmd --list-all

Additional information

A. Install/Update JDK

The Todd Sharp documentation also explains how to install Java with yum commands, but you may already have a version installed on your VM.

Here's an updated version of his tutorial:

  • Check online available versions of JDK:

    yum list jdk*

  • Install the latest JDK (headless):

    sudo yum install jdk-22-headless.aarch64

  • List all installed JDK:

    yum list installed | grep jdk*

  • Remove unused JDK:

    sudo yum remove jdk-17-headless.aarch64

  • Check your current Java version:

    java --version

B. Create a Minecraft server network

If you're interested in setting up a Minecraft server, I strongly recommend checking out Crafty Controller, Velocity Proxy and PaperMC Server.

  • Paper is a Minecraft server forked from Spigot.
  • Velocity is a Minecraft server proxy and a way better alternative to BungeeCord.
  • Crafty Controller is an administration panel to create and manage Minecraft servers easily.

For more information, I have done some research and written documentation about Velocity and Crafty Controller in this repository: AmbersoneDream/ProxyServerResearch.