Azure Virtual Machine Scale Set(VMSS) Reset SSH KEY

update-vmss-ssh-key.sh

az vmss extension set \
  --vmss-name <vmss-name> \
  -g <resource-group> \
  -n VMAccessForLinux \
  --publisher Microsoft.OSTCExtensions \
  --version 1.4 \
  --protected-settings "{\"username\":\"deploy_user\", \"ssh_key\":\"$(cat ~/.ssh/id_rsa.pub)\"}"
# Upgrade ALL instances in the scale set with the new key  
az vmss update-instances --instance-ids '*'
                         -n <vmss-name>
                         -g <resource-group>

az vmss update-instances --instance-ids '*'
                         -n <vmss-name>
                         -g <resource-group>

should be

az vmss update-instances --instance-ids '*' \
                         -n <vmss-name> \
                         -g <resource-group>

you might also consider updating deploy_user to <deploy-user> as well.

mostly, thanks for creating this gist, it saved me a lot of time reading MS documentation.

thanks too ! spend almost one hour to be able to SSH into this !@# VMSS thing...
Great job !

Btw does this "update-vmss-ssh-key.sh" update the existing key which was already set with an extension ?. Basically i have added the ssh key with the commands mentioned in update-vmss-ssh-key.sh ...now i want to change the ssh key ...shall i follow the same steps mentioned with a different pub key ?

Doesn't work! everytime I try this give me an error /home/user/.ssh/id_rsa.pub: No such file or directory

Next how to remove the SSH key ?