Category Archives: Administrations

Force stop xen vm using command line

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Instructions

  1. Disable High Availability (HA) so you don’t run into issues.
  2. Log into the Xenserver host that is running your VM with issues via ssh or console via XenCenter. Run the following command to list VMs and their UUIDs 
    xe vm-list resident-on=<uuid_of_host>
  3. First you can try just the normal shutdown command with force 
    xe vm-shutdown uuid=<UUID from step 3> force=true
  4. If that just hangs, use CONTROL+C to kill it off and try to reset the power state.  The force is required on this command 
    xe vm-reset-powerstate uuid=<UUID from step 3> force=true
  5. If the VM is still not shutdown, we may need to destroy the domain.  Run this command to get the domain id of the VM.  It is the number in the first row of output. The list will be the VMs on the host.  Dom0 will be the host itself and all numbers after are running VM 
    list_domains
  6. Now run this command using the domain ID from the output of step 7 
    xl destroy <DOMID from step 7>
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Perfect Proxmox Template with Cloud Image and Cloud Init

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Instructions

Choose your Ubuntu Cloud Image. Here in this example will use ubuntu cloud-init image. Download Ubuntu (replace with the url of the one you chose from above)

wget https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img

Create a new virtual machine

qm create 8000 --memory 2048 --core 2 --name ubuntu-cloud --net0 virtio,bridge=vmbr0

Import the downloaded Ubuntu disk to local-lvm storage Continue reading “Perfect Proxmox Template with Cloud Image and Cloud Init” »

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pfSense firewall rules for WhatsApp

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For simplicity, you can also follow the step by step instructions from your pfSense WebGUI below:

1. Create a PORT alias:

Firewall -> Aliases -> Ports -> + AddName: WhatsAppPortsTCP
Port: 443
-> + Add PortPort: 5222
Save (bottom) -> Apply Changes (top right)

2. Create a URL alias:

Firewall -> Aliases – URLs -> + AddName: WhatsAppIPv4_URL
Type: URL Table (IPs)
URL Table (IPs): https://adamnetworks.dev/pub/fwaliases/raw/master/ips/whatsapp.txt /(update frequency): 1
Save (bottom) -> Apply Changes (top right) Continue reading “pfSense firewall rules for WhatsApp” »

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Install Softether VPN Client on Linux

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Download and Install SoftEther VPN Client

Download SoftEther VPN Client software from their official website (https://www.softether.org).

Navigate to Download — > Download SoftEther VPN

Click on Download SoftEther VPN link.

  • Select Component : SoftEther VPN Client
  • Select Platform : Linux
  • Select CPU : Select the appropriate CPU from the Drop down

  • Click on the appropriate downloading link based on the version of the software.
  • Extract the downloaded tar.gz file. Here after I will refer the extracted folder as <vpnclient>
  • Navigate to <vpnclient>folder and open a terminal.
  • Execute make command and accept all license agreements by entering the number relevant to “Yes”. execute make command

After the completion of make command process, start the vpn client using: Continue reading “Install Softether VPN Client on Linux” »

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Remove Old Unused Kernels in CentOS

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To display the current version of Linux (kernel) running on your system, run this command.

# uname -sr
Linux 3.10.0-327.10.1.el7.x86_64

List All Installed Kernels on System

You can list all kernel images installed on your system like this.

# rpm -q kernel
kernel-3.10.0-229.el7.x86_64
kernel-3.10.0-229.14.1.el7.x86_64
kernel-3.10.0-327.3.1.el7.x86_64
kernel-3.10.0-327.10.1.el7.x86_64

Removing Old/Unused Kernels on CentOS/RHEL

You need to install yum-utils, which is an assortment of utilities that integrate with yum to make it more powerful and easier to use, by extending its original features in several different ways. Continue reading “Remove Old Unused Kernels in CentOS” »

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Setup Keepalived for VRRP instead of ucarp

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I’ve the following setup:

network-0 – 192.168.2.11 (real)
network-1 – 192.168.2.12 (real)

I want to add “network” as 192.168.2.10 as the floating address.  I’ll need to do the following to both network-0 and network-1

  • Install keepalived
  • Configure keepalived
  • Start keepalived
  • Set keepalived to start at boot.

Continue reading “Setup Keepalived for VRRP instead of ucarp” »

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Proxmox GUI webpage stuck on loading

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Connection time out!!!! So boring nah?

I can’t figure out where the problem is. It works and then couple of hours later I’d come back and it keeps on loading forever. SSH works fine, can SSH into containers as well. Just the GUI doesn’t work. Tried full upgrade. Checked for network conflicts, doesn’t seem to be any.

Here’s the tidbit solution to this probelm like similar (BTW works on PVE 6/7 version apparent)-

If browser refresh doesn’t work, then please post the output:

apt update
apt full-upgrade
pveversion -v

Then Run

apt install --reinstall pve-manager proxmox-widget-toolkit
systemctl restart pveproxy pvestatd pvedaemon
systemctl daemon-reload
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Setup HAProxy Load Balancer for MariaDB Galera Cluster

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If you check the above test scenario and try to create DBs on any of the nodes, you would see that the data would automatically sync between the nodes. Which means Availability is achieved. Now to achieve high availability we will use HaProxy as the loadbalancer.

Set up another VM for this and install HAProxy as follows.

sudo apt-get update
sudo apt-get install haproxy

Edit HA Proxy Config as follows.

sudo vim /etc/haproxy/haproxy.cfg

Add the following lines. Continue reading “Setup HAProxy Load Balancer for MariaDB Galera Cluster” »

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MariaDB Galera Cluster on Ubuntu 20

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MariaDB Galera Cluster is a synchronous multi-master cluster for MariaDB with support for XtraDB/InnoDB storage engines. It has the following top features.

  • It provides active-active multi-master topology
  • You can read and write to any cluster node
  • It has an automatic node joining
  • Automatic membership control, failed nodes drop from the cluster
  • Has true parallel replication, on row level
  • Direct client connections
sudo apt update && sudo apt -y upgrade
sudo reboot

Setup Hostnames

Here’re the IP plans of my servers-

Continue reading “MariaDB Galera Cluster on Ubuntu 20” »

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Installer for jitsi-meet, jigasi and jibri

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Found this lovely code base (that actually worked) on github, supported on a debian 10/11 or ubuntu 20+ versions-

The script (jitsi_setup.sh) can be used to install stable version of all 3 on a stand-alone server. This is simply a script version of quick-install document at https://jitsi.github.io/handbook/docs/devops-guide/devops-guide-quickstart

It Installs below mentioned software:

nginx, prosody, jitsi-meet-prosody, jitsi-meet, jitsi-meet-web, jitsi-meet-web-config, jitsi-meet-turnserver, jicofo, jitsi-videobridge2

Below are optional, will be installed only if opted for:

jigasi (https://github.com/jitsi/jigasi)
jibri (https://github.com/jitsi/jibri)

Also has option for configuring:

  • secure domain (https://jitsi.github.io/handbook/docs/devops-guide/secure-domain)
  • jigasi authentication (find it towards the end of secure domain link)
  • transcription(Google/Vosk) (https://github.com/jitsi/jigasi#configuring-sip-and-transcription)
  • Etherpad (https://github.com/ether/etherpad-lite)

Continue reading “Installer for jitsi-meet, jigasi and jibri” »

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