我运行这个：
ssh -t -vvv -i ~/.ssh/druid-keypair -o StrictHostKeyChecking=no ubuntu@${INSTANCE_ADDRESS} <<EOI
# Setup Oracle Java
...
# Install dependencies - mysql must be built from source, as the 12.04 apt-get hangs
export DEBIAN_FRONTEND=noninteractive
sudo debconf-set-selections <<< 'mysql-server-5.5 mysql-server/root_password password diurd'
sudo debconf-set-selections <<< 'mysql-server-5.5 mysql-server/root_password_again password diurd'
sudo apt-get -q -y -V --force-yes --reinstall install mysql-server-5.5
echo "ALL DONE with druid environment setup!"
exit
EOI
注意：我在 ssh 中尝试过使用和不使用 -t。
-vvv 的调试输出是这样的：
...
ldconfig deferred processing now taking place
ALL DONE with …