3.0 KiB
Migration Geodesic ZFS
Needs
Summary
- Rsync
- Offline migration (data files)
- Online migration (dumps)
- Snapshots
- Virtual Machines
- ZFS/BTRFS
- Container-based solutions
rsync/scp : offline migration
rsync/scp : online migration
rsync/scp
Possible practical issues :
- File permissions
- Postgres permissions
- SSH keys
- Configuration mismatch
+ No big architectural changes
- Lots of configuration
- Heavy : will take time to backup and restore
- Hacky ?
Snapshots
Snapshots
Snapshots
Snapshots
Virtual Machine cloning
- Must fiddle with hypervisor
- We don't want to nest virtual machines
ZFS
Conventional Filesystem
ZFS
Copy on write (CoW)
ZFS
Simplified CoW representation
ZFS
Snapshots using CoW
ZFS
Tools :
+ Automatic / Seamless
- Possible use of untested additional tools/programs
- Additional system complexity
Container-based solutions
LXD
- Hypervisor for Linux Containers (LXC) and virtual machines
- Can use ZFS
- Canonical maintaned
+ Automatic / Seamless
- Additional architectural complexity
Kubernetes Volume Cloning
+ Automatic / Seamless
- Additional architectural complexity
- Definitely Hacky
- Kubernetes
- Better handled with operators/pods