What are the services on Linux (CentOS) that communicate with the Google Compute Engine (GCE) infrastructure to configure and manage a VM (SSH keys, for example)?
These don't seem to be updated with yum. How are security patches deployed?
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This shows the two packages that are installed to manage SSH keys, update hostnames, and clock skew, among other things.
The stock images from Google include yum-cron which is a service and cron to automatically update packages, including these.
$ cat /etc/yum.repos.d/google-cloud.repo [google-cloud-compute] name=Google Cloud Compute baseurl=https://packages.cloud.google.com/yum/repos/google-cloud-compute-el7-x86_64 enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
There is also a page that describes what is in the CentOS image provided by Google.