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144 lines
2.4 KiB
Markdown
144 lines
2.4 KiB
Markdown
# Migration Geodesic ZFS
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----
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# Needs
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----
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# Summary
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- Rsync
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- Offline migration (data files)
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- Online migration (dumps)
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- Snapshots
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- Virtual Machines
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- ZFS/BTRFS
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- Container-based solutions
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----
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## rsync/scp : offline migration
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----
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## rsync/scp : online migration
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----
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## rsync/scp
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#### Possible practical issues :
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- File permissions
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- Postgres permissions
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- SSH keys
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- Configuration mismatch
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<!--- Static files : `rsync` or `scp` --->
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```diff
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+ No big architectural changes
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- Lots of configuration
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- Heavy : will take time to backup and restore
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- Hacky ?
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```
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----
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## Snapshots
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----
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## Snapshots
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----
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## Snapshots
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----
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## Snapshots
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----
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### Virtual Machine cloning
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```diff
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- Must fiddle with hypervisor
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- We don't want to nest virtual machines
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```
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----
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### ZFS
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<!-- https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-000-nocow.gif -->
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> Conventional Filesystem
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----
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### ZFS
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<!-- https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-000-nocow.gif -->
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> Copy on write (CoW)
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----
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### ZFS
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<!-- https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-002-data-worm.gif -->
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> Simplified CoW representation
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----
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### ZFS
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<!-- https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-003-visualizing-snapshots.gif -->
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> Snapshots using CoW
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----
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### ZFS
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#### Tools :
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- [zrepl](https://zrepl.github.io/quickstart.html)
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- [syncoid](https://github.com/jimsalterjrs/sanoid/wiki/Syncoid)
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```diff
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+ Automatic / Seamless
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- Possible use of untested additional tools/programs
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- Additional system complexity
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```
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----
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### Container-based solutions
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#### LXD
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- Hypervisor for Linux Containers (LXC) and virtual machines
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- Can use ZFS
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- Canonical maintaned
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```diff
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+ Automatic / Seamless
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- Additional architectural complexity
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```
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----
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#### Kubernetes Volume Cloning
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```diff
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+ Automatic / Seamless
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- Additional architectural complexity
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- Definitely Hacky
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- Kubernetes
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- Better handled with operators/pods
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```
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