用 aws metadata api 获取本机的 iam role 的脚本

instance_profile=curl http://169.254.169.254/latest/meta-data/iam/security-credentials/

aws_access_key_id=curl http://169.254.169.254/latest/meta-data/iam/security-credentials/<span class="variable">${instance_profile}</span> | grep AccessKeyId | cut -d<span class="string">':'</span> -f2 | sed <span class="string">'s/[^0-9A-Z]*//g'</span>  
aws_secret_access_key=curl http://169.254.169.254/latest/meta-data/iam/security-credentials/<span class="variable">${instance_profile}</span> | grep SecretAccessKey | cut -d<span class="string">':'</span> -f2 | sed <span class="string">'s/[^0-9A-Za-z/+=]*//g'</span>

export AWS_ACCESS_KEY_ID=${aws_access_key_id}
export AWS_SECRET_ACCESS_KEY=${aws_secret_access_key}