VI Editor Linux

https://www.redhat.com/sysadmin/introduction-vi-editor#:~:text=To%20enter%20Insert%20mode%2C%20press,press%20the%20Esc%20key%20once.

Azure Resource Explorer

resources.azure.com

https://azure.microsoft.com/en-in/blog/azure-resource-explorer-a-new-tool-to-discover-the-azure-api/

Linux, Disk Mount, Detach

https://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html#Examples

https://m.facebook.com/nt/screen/?params=%7B%22note_id%22%3A346120513277920%7D&path=%2Fnotes%2Fnote%2F&refsrc=deprecated&_rdr

https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/troubleshoot-recovery-disks-portal-linux

https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/troubleshoot-recovery-disks-portal-linux#take-a-snapshot-of-the-os-disk

https://devblogs.microsoft.com/premier-developer/choosing-the-right-tooling-for-azure-and-side-by-side-azure-cli-and-powershell-commands/

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

#Provide the name of your resource group $resourceGroupName ='myResourceGroup' #Provide the name of the snapshot that will be used to create Managed Disks $snapshotName = 'mySnapshot' #Provide the name of theManaged Disk $diskName = 'newOSDisk' #Provide the size of the disks in GB. It should be greater than the VHD file size. In this sample, the size of the snapshot is 127 GB. So we set the disk size to 128 GB. $diskSize = '128' #Provide the storage type for Managed Disk. Premium_LRS or Standard_LRS. $storageType = 'Standard_LRS' #Provide the Azure region (e.g. westus) where Managed Disks will be located. #This location should be same as the snapshot location #Get all the Azure location using command below: #Get-AzLocation $location = 'westus' $snapshot = Get-AzSnapshot -ResourceGroupName $resourceGroupName -SnapshotName $snapshotName $diskConfig = New-AzDiskConfig -AccountType $storageType -Location $location -CreateOption Copy -SourceResourceId $snapshot.Id New-AzDisk -Disk $diskConfig -ResourceGroupName $resourceGroupName -DiskName $diskName

Linux Mount Disk : blkid -o full and lsblk -f and lsblk and df -h

fda@FDA-VEA-VM:/$ blkid -o full
/dev/sda1: LABEL="cloudimg-rootfs" UUID="f89a10d0-2ae6-4411-9086-8ccd221055fd" TYPE="ext4" PARTUUID="b08788dd-af4a-4015-b7b0-f7b53b252ddd"
/dev/sda15: LABEL="UEFI" UUID="C4E4-E7F8" TYPE="vfat" PARTUUID="12798101-40c7-4dfe-8b16-58d8522bbbc0"
/dev/sdb1: LABEL="Temporary Storage" UUID="02BEE3C1BEE3AB7D" TYPE="ntfs" PARTUUID="29e34589-01"

fda@FDA-VEA-VM:/$ lsblk -f
NAME    FSTYPE LABEL           UUID                                 MOUNTPOINT
sda
├─sda1  ext4   cloudimg-rootfs f89a10d0-2ae6-4411-9086-8ccd221055fd /
├─sda14
└─sda15 vfat   UEFI            C4E4-E7F8                            /boot/efi
sdb
└─sdb1  ext4                   43e815d5-3bed-4f3b-a218-89a068dddc2c /mnt
sdc     ext4                   204db14b-9657-49b9-8daf-35ba202e295c
sr0

fda@FDA-VEA-VM:/$ lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda       8:0    0   30G  0 disk
├─sda1    8:1    0 29.9G  0 part /
├─sda14   8:14   0    4M  0 part
└─sda15   8:15   0  106M  0 part /boot/efi
sdb       8:16   0   32G  0 disk
└─sdb1    8:17   0   32G  0 part /mnt
sdc       8:32   0  150G  0 disk
sr0      11:0    1  628K  0 rom

fda@FDA-VEA-VM:/$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            7.9G     0  7.9G   0% /dev
tmpfs           1.6G  688K  1.6G   1% /run
/dev/sda1        29G  1.4G   28G   5% /
tmpfs           7.9G     0  7.9G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           7.9G     0  7.9G   0% /sys/fs/cgroup
/dev/sda15      105M  6.6M   98M   7% /boot/efi
/dev/sdb1        32G   49M   30G   1% /mnt
tmpfs           1.6G     0  1.6G   0% /run/user/1000

How to debug Azure VM Issues

https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/troubleshoot-recovery-disks-portal-linux

https://www.hiroom2.com/2018/04/30/ubuntu-1804-serial-console-en/#sec-1

https://tldp.org/HOWTO/Remote-Serial-Console-HOWTO/configure-boot-loader-grub.html

https://www.hiroom2.com/2018/04/30/ubuntu-1804-serial-console-en/

https://askubuntu.com/questions/924913/how-to-get-to-the-grub-menu-at-boot-time-using-serial-console

https://www.youtube.com/watch?v=sVMgZ9YW6i8

https://www.lcn.com/support/articles/how-to-show-hidden-files-in-ftp/

https://askubuntu.com/questions/391082/how-to-see-time-stamps-in-bash-history

SSH Not Getting Connected : Azure VM

 Settings   ->  Disks

Settings   ->  Properties  -> Agent status : Not Ready  or Ready

TTY

Sys REQ 

Grub Loader

Serial Console

sysctl -a |grep -i sysrq

https://www.youtube.com/watch?v=KevOc3d_SG4&t=147s

https://www.youtube.com/watch?v=HnvUxnNzbe4

https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/serial-console-grub-proactive-configuration 

https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html

waagent 

https://github.com/Azure/WALinuxAgent

The Microsoft Azure Linux Agent (waagent) manages Linux provisioning and VM interaction with the Azure Fabric Controller.

What is Azure fabric?

Azure Service Fabric is a distributed systems platform that makes it easy to package, deploy, and manage scalable and reliable microservices and containers

Operations   ->

Monitoring  ->

Automation  ->

Support + troubleshooting  ->  Resource health

Support + troubleshooting  ->  Boot diagnostics

Support + troubleshooting  ->  Performance diagnostics

Support + troubleshooting  ->  Serial console

Connect -> Connect with Bastion Host 

https://docs.microsoft.com/en-us/azure/bastion/tutorial-create-host-portal

https://www.rebeladmin.com/2019/11/step-step-guide-access-azure-vms-securely-using-azure-bastion/

Role

https://docs.microsoft.com/en-us/azure/role-based-access-control/check-access

Azure VM     ->    Support + troubleshooting  ->   Boot diagnostics

Boot Diagnostics

https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/serial-console-grub-single-user-mode

https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/boot-diagnostics

https://docs.microsoft.com/en-us/azure/role-based-access-control/built-in-roles#virtual-machine-contributor

GrubLoader Issue

https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/troubleshoot-vm-boot-error

https://gutsytechster.wordpress.com/2018/07/24/how-to-resolve-grub-error-file-grub-i386-pc-normal-mod-not-found/

https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/serial-console-grub-proactive-configuration

https://www.youtube.com/watch?v=KevOc3d_SG4

https://askubuntu.com/questions/266429/error-file-grub-i386-pc-normal-mod-not-found

10.79.202.5

fda

Rage@1234567

azureubuntu

azlinux

R....1......e2021

GRand Unified Bootloader (GRUB) is likely the first thing you see when you boot a virtual machine (VM). Because it's displayed before the operating system has started, GRUB isn't accessible via SSH. In GRUB, you can modify your boot configuration to boot into single-user mode, among other things.

REISUB

az vm start -g CORA-AI -n FDA-VEA

az vm restart -g CORA-AI -n FDA-VEA

az vm restart -g CORA-AI -n FDA-VEA --force  --no-wait

az serial-console send reset -g CORA-AI -n FDA-VEA

az serial-console send reset -g CORA-AI -n FDA-VEA

az vm boot-diagnostics get-boot-log -g CORA-AI -n FDA-VEA

az serial-console connect -g CORA-AI -n FDA-VEA

az serial-console send reset -g CORA-AI -n FDA-VEA

az vm boot-diagnostics enable -g CORA-AI -n FDA-VEA

$subscriptionId=$(az account show --output=json | jq -r .id)

az resource show --ids "/subscriptions/$subscriptionId/providers/Microsoft.SerialConsole/consoleServices/default" --output=json --api-version="2018-05-01" | jq .properties