这是关于GCP计算实例的。我的GCP实例无法从元数据服务器获取GCE metadata。,因此，当我安装Openstack on google cloud (GCP)通过packstack在CentOS图像上，我得到这个错误。
虚拟机实例是默认网络的一部分，没有防火墙规则。我也可以从外部登录节点，这证明网络是正常的。
ERROR : Error appeared during Puppet run: 10.142.0.16_compute.pp
Error: Facter: GCE metadata request failed: Timeout was reached
Oct 25 20:16:31 controller-8 google_guest_agent[146448]: ERROR main.go:190 Network error when requesting metadata, make sure your instance has an active network and can reach the metadata server.
Oct 25 20:16:31 controller-8 google_guest_agent[146448]: ERROR main.go:193 Error watching metadata: Get http://169.254.169.254/computeMetadata/v1//?recursive=true&alt=json&wait_for_change=true&timeout_sec=60&last_etag=6f06fe6d055dd9f5: dial tcp 169.254.169.254:80: connect: no route to host
Oct 25 20:19:07 controller-8 OSConfigAgent[146888]: 2021-10-25T20:19:07.5468Z OSConfigAgent Error main.go:218: Get http://169.254.169.254/computeMetadata/v1/?recursive=true&alt=json&wait_for_change=true&last_etag=6f06fe6d055dd9f5&timeout_sec=60: dial tcp 169.254.169.254:80: connect: no route to host
Oct 25 20:20:08 controller-8 OSConfigAgent[146888]: 2021-10-25T20:20:08.9868Z OSConfigAgent Error main.go:218: network error when requesting metadata, make sure your instance has an active network and can reach the metadata server: Get http://169.254.169.254/computeMetadata/v1/?recursive=true&alt=json&wait_for_change=true&last_etag=6f06fe6d055dd9f5&timeout_sec=60: dial tcp 169.254.169.254:80: connect: no route to host
Oct 25 20:21:10 controller-8 OSConfigAgent[146888]: 2021-10-25T20:21:10.4268Z OSConfigAgent Error main.go:218: network error when requesting metadata, make sure your instance has an active network and can reach the metadata server: Get http://169.254.169.254/computeMetadata/v1/?recursive=true&alt=json&wait_for_change=true&last_etag=6f06fe6d055dd9f5&timeout_sec=60: dial tcp 169.254.169.254:80: connect: no route to host
Oct 25 20:22:10 controller-8 OSConfigAgent[146888]: 2021-10-25T20:22:10.7148Z OSConfigAgent Error main.go:218: network error when requesting metadata, make sure your instance has an active network and can reach the metadata server: Get http://169.254.169.254/computeMetadata/v1/?recursive=true&alt=json&wait_for_change=true&last_etag=6f06fe6d055dd9f5&timeout_sec=60: dial tcp 169.254.169.254:80: connect: no route to host
IIUC，根据此错误提示:connect: no route to host，尝试使用metadata.google.internal域来替换此IP169.254.169.254?
查看此文档元数据请求的部分，并确保有正确的/etc/resolv.conf之前的nameserver文件。您应该根据John Hanley的建议检查服务帐户设置。