如何在AWS实例创建完成之前等待bash脚本

Question

我正在使用bash脚本通过CLI和cloudformation模板创建AWS实例.我希望我的脚本等到实例创建完成后再继续我的脚本.现在,我每隔5秒钟使用一个while循环"describe-stacks",并在status ="CREATE_COMPLETE"或某些失败状态时断开循环.有谁知道更优雅的方式来做到这一点？

stackStatus="CREATE_IN_PROGRESS"

while [[ 1 ]]; do
    echo "${AWS_CLI_PATH}" cloudformation describe-stacks --region "${CfnStackRegion}" --stack-name "${CfnStackName}"
    response=$("${AWS_CLI_PATH}" cloudformation describe-stacks --region "${CfnStackRegion}" --stack-name "${CfnStackName}" 2>&1)
    responseOrig="$response"
    response=$(echo "$response" | tr '\n' ' ' | tr -s " " | sed -e 's/^ *//' -e 's/ *$//')

    if [[ "$response" != *"StackStatus"* ]]
    then
        echo "Error occurred creating AWS CloudFormation stack. Error:"
        echo "    $responseOrig"
        exit -1
    fi

    stackStatus=$(echo $response | sed -e 's/^.*"StackStatus"[ ]*:[ ]*"//' -e 's/".*//')
    echo "    StackStatus: $stackStatus"

    if [[ "$stackStatus" == "ROLLBACK_IN_PROGRESS" ]] || [[ "$stackStatus" == "ROLLBACK_COMPLETE" ]] || [[ "$stackStatus" == "DELETE_IN_PROGRESS" ]] || [[ "$stackStatus" == "DELETE_COMPLETE" ]]; then
        echo "Error occurred creating AWS CloudFormation stack and returned status code ROLLBACK_IN_PROGRESS. Details:"
        echo "$responseOrig"
        exit -1
    elif [[ "$stackStatus" == "CREATE_COMPLETE" ]]; then
        break
    fi

    # Sleep for 5 seconds, if stack creation in progress
    sleep 5
done

Answer 1

Ec2-wait-instance-exists 似乎是您所需要的： http://docs.aws.amazon.com/cli/latest/reference/ec2/wait/instance-exists.html

Answer 2

我就是这样做的。实例启动后，我等待公共 IP：

INSTANCE_ID="$(aws ec2 run-instances --cli-input-json "${LAUNCH_SPEC}" | jq -r '.Instances[0].InstanceId')"
echo "Instance id ${INSTANCE_ID}"

while true; do
    PUBLIC_IP="$(aws ec2 describe-instances --instance-ids ${INSTANCE_ID} | jq -r '.Reservations[0].Instances[0].PublicIpAddress')"
    if [[ "${PUBLIC_IP}" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]]; then break; fi
    sleep 1
    echo -n '.'
done

之前定义的 LAUNCH_SPEC

Answer 3

aws cli为wait创建资源的大多数命令提供了一个子命令。对于您的方案，可以使用wait子命令来等待stack-create-complete事件：

aws cloudformation wait stack-create-complete --stack-name myStackName