Permission denied (publickey,gssapi-keyex,gssapi-with-mic)【Google Compute Engine】【Rocky Linux】

クライアント

ssh-keygen -q -f $HOME/.ssh/id_rsa -P ''
cat $HOME/.ssh/id_rsa.pub

サーバー id_rsa.pubをauthorized_keysにコピペ

echo ssh $USER@$(curl -sL domains.google.com/checkip)
mkdir -p $HOME/.ssh
chmod 0700 $HOME/.ssh
touch $HOME/.ssh/authorized_keys
chmod 0600 $HOME/.ssh/authorized_keys
vim $HOME/.ssh/authorized_keys

rootでログインする場合

echo PermitRootLogin yes >> /etc/ssh/sshd_config
systemctl reload sshd

GCPはSSHが有効になってるため設定は必要ありません

ユーザーを追加する場合( Debian )

USERNAME=myuser
sudo useradd -m -p '' $USERNAME
sudo usermod -aG sudo $USERNAME
su - $USERNAME

echo ssh $USER@$(curl -sL domains.google.com/checkip)
mkdir -p $HOME/.ssh
chmod 0700 $HOME/.ssh
touch $HOME/.ssh/authorized_keys
chmod 0600 $HOME/.ssh/authorized_keys
vim $HOME/.ssh/authorized_keys

ユーザーを追加する場合( Rocky Linux )

USERNAME=myuser
sudo useradd -m -p '' $USERNAME
sudo usermod -aG wheel $USERNAME
su - $USERNAME

echo ssh $USER@$(curl -sL domains.google.com/checkip)
mkdir -p $HOME/.ssh
chmod 0700 $HOME/.ssh
touch $HOME/.ssh/authorized_keys
chmod 0600 $HOME/.ssh/authorized_keys
vim $HOME/.ssh/authorized_keys