LXC-Migration/tooling.md

Tooling

Control

• lxc (and sub-tools)

Building container images

• debootstrap Note: it allows importing docker rootfs aswell, however it isn't recommended

Base images

• Alpine - edge

Build setup

• Overlay directories to reuse the base rootfs and add configs on top

Build location

• Servers (prefferably)
• Local (fallback)

Setup

Initial clustering

• Manual
• Preseed (needs reading and some dynamic variables, could be done via Ansible)

Deployment

• Manual (automated with the help of the shell on need)
• Likely small use of volumes (live migration and snapshots allow easy migration) TODO: Check if volume snapshots are a thing
• Limited base image modification (especially if it doesn't need any on-disk data)
• Port exposure needs to be defined manually on a per container basiss using proxy devices, see: Proxy Protocol for Proxy device in LXD
• Ports can be forwarded in the firewall with DNAT aswell
  • Containers need IPv6 endpoint in DNAT mode

Backup

• Container/Volume snapshots
• Eventual backup locations:
  • Amazon S3
  • Hetzner storage boxes
  • Local (occasional)

Documenting/Testing list

• DNS (mostly unknown)
  • Endpoint from containers? (/etc/resolv.conf? DHCP? Fixed?)
  • TLD .lxd (default)
• Tiered networks
  • Most likely possible with special interfaces
  • Needs host configuration
• Replicas
  • Looks like it is not possible