2 ms·

Snapshots are often used for deployment of systems. What happens if the snapshot you rely on as a base image gets lost?

by op00to 5y ago

traspler 5y ago
Create a new one?
- op00to 5y ago
  If the base snapshot is gone, all future snapshots that rely on that snapshot may be invalid. Depends on exactly how snapshots are implemented. Are they a delta of the previous snapshot? Are they a full copy of the device?
  - Kwpolska 5y ago
    Hetzner snapshots are fully independent disk images, nothing more, nothing less.
    - op00to 5y ago
      Thanks! $20 seems kinda fair then, I guess.
justinholmes 5y ago
Base images should be repeatable anyway using packer etc.
- tetha 5y ago
  Even though this is a bit tricky on the hetzner cloud, because it requires the addition of a static route[1] to access the internet which isn't pushed by the DHCP, and I haven't been able to fully automate that in debians preseed for the life of me. Yes it's offtopic, but that's one really frustrating thing. Maybe someone here has a solution. 1: https://docs.hetzner.com/cloud/servers/iso-installation-gateway/#installation https://docs.hetzner.com/cloud/servers/iso-installation-gate...
  - sam_lowry_ 5y ago
    cloud-init?
    - tetha 5y ago
      cloud-init does help us, once we have a working linux, but we can also bake the static route into a base image. The problem is that preseed is a very minimal linux environment and either relies on DHCP to work, or to use the usual network config DHCP sets (address, netmask, gateway). Arbitrary routes are not a possibility there. And ways to run abitrary commands to just <ip r> something come after the network initialization, which fails in that setup. The same holds for the kernel network bootstrapping parameters, I haven't found a way to add an arbitrary route there yet. And for some reason, kickstart is able to handle this with it's centos/RHEL base.

2 ms·

Snapshots are often used for deployment of systems. What happens if the snapshot you rely on as a base image gets lost?

by op00to 5y ago

Snapshots are often used for deployment of systems. What happens if the snapshot you rely on as a base image gets lost?

traspler 5y ago
Create a new one?
- op00to 5y ago
  If the base snapshot is gone, all future snapshots that rely on that snapshot may be invalid. Depends on exactly how snapshots are implemented. Are they a delta of the previous snapshot? Are they a full copy of the device?
  - Kwpolska 5y ago
    Hetzner snapshots are fully independent disk images, nothing more, nothing less.
    - op00to 5y ago
      Thanks! $20 seems kinda fair then, I guess.
justinholmes 5y ago
Base images should be repeatable anyway using packer etc.
- tetha 5y ago
  Even though this is a bit tricky on the hetzner cloud, because it requires the addition of a static route[1] to access the internet which isn't pushed by the DHCP, and I haven't been able to fully automate that in debians preseed for the life of me. Yes it's offtopic, but that's one really frustrating thing. Maybe someone here has a solution. 1: https://docs.hetzner.com/cloud/servers/iso-installation-gateway/#installation https://docs.hetzner.com/cloud/servers/iso-installation-gate...
  - sam_lowry_ 5y ago
    cloud-init?
    - tetha 5y ago
      cloud-init does help us, once we have a working linux, but we can also bake the static route into a base image. The problem is that preseed is a very minimal linux environment and either relies on DHCP to work, or to use the usual network config DHCP sets (address, netmask, gateway). Arbitrary routes are not a possibility there. And ways to run abitrary commands to just <ip r> something come after the network initialization, which fails in that setup. The same holds for the kernel network bootstrapping parameters, I haven't found a way to add an arbitrary route there yet. And for some reason, kickstart is able to handle this with it's centos/RHEL base.