我认为您的做法正确。我将对传递3个私有替代变量的方式进行一些修改，例如（在模板中经常使用）：

I think you're on the right path. I would just modify a bit the way you pass the 3 "private" substitute variables, for something like this (which I use quite often in my templates):

UserData:
  Fn::Base64:
    Fn::Sub:
      - |
        CONF="/etc/zookeeper/conf.dist/zoo.cfg"
        cp $CONF /etc/zookeeper/conf.dist/zoo.cfg.bak-$(date +%s)
        echo "# Zookeeper configuration for Talentreef" > "$CONF"
        cat <<EOT >> "$CONF"
        maxClientCnxns=50
        tickTime=2000
        initLimit=10
        syncLimit=5
        EOT
        echo "server.1=${Private1}:2888:3888" >> $CONF
        echo "server.2=${Private2}:2888:3888" >> $CONF
        echo "server.3=${Private3}:2888:3888" >> $CONF
        service zookeeper-server init --myid=$NODE_ID
        chkconfig zookeeper-server on
      - Private1: !GetAtt EC2NI2E8ES.PrimaryPrivateIpAddress
        Private2: !GetAtt EC2NI2PFST.PrimaryPrivateIpAddress
        Private3: !GetAtt EC2NI54B66.PrimaryPrivateIpAddress

因此没有括号 {} 并且没有逗号，

So no brackets {} and no commas ,