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As I described at https://github.com/scylladb/scylla/issues/6973#issuecomment-669705374,
we need to avoid disk full on scylla_swap_setup, also we should provide manual configuration of swap size.
This PR provides following things:
- use psutil to get memtotal and disk free, since it provides better APIs
- calculate swap size in bytes to avoid causing error on low-memory environment
- prevent to use more than 50% of disk space when auto-configured swap size, abort setup when almost no disk space available (less than 2GB)
- add --swap-size option to specify swap size both on scylla_swap_setup and scylla_setup
- add interactive swap size prompt on scylla_setup
Fixes#6947
Related #6973
Related scylladb/scylla-machine-image#48
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* syuu1228-scylla_swap_setup_improves:
scylla_setup: add swap size interactive prompt on swap setup
scylla_swap_setup: add --swap-size option to specify swap size
scylla_swap_setup: limit swapfile size to half of diskspace
scylla_swap_setup: calculate in bytes instead of GB
scylla_swap_setup: use psutil to get memtotal and disk free
188c832e3d