ssh

bash
az vm extension set -n VMAccessForLinux --publisher Microsoft.OSTCExtensions --version 1.4 \
    --vm-name vmName --resource-group resourceGroup \
    --protected-settings '{"username":"user", "ssh_key":"ssh-rsa ..."}'

1. Set service OpenSSH Authentication Agent to Automatic and Start it.
2. In Powershell, ssh-add
3. In environment variables, add GIT_SSH=C:\Windows\System32\OpenSSH\ssh.exe

See more

bash
sudo apt-get install keychain
ssh-keygen -t ed25519 -C "stafford.williams@gmail.com"

linux:

bash
echo "eval \`keychain --clear --eval id_ed25519\`" >> ~/.profile
cat ~/.ssh/id_ed25519.pub

macOS: see docs

bash
ssh-copy-id -i ~/.ssh/id_rsa.pub user@host

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ssh-keygen -R THE_IP_ADDRESS_OR_URL