How to share nix store among multiple aws instances?

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I am using nixops and want to reduce disk space consumption by sharing nix store among instances.



Possible implementation:



  • share /nix/store store through elastic file system.

  • make cron job on random machine inside network that runs nix-collect-garbage -d. This will remove all packages that are not linked with first machine: actually stale packages and packages of other machines inside network. To restore them first machine triggers nixos-rebuild switch on other machines inside network.

Can this be done better/does this make sense?




aws nixos nix




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  • 1




    Not sure if this works for NixOS, but I once shared the nix store via NFS: nixos.wiki/wiki/NFS#Nix_store_on_NFS You could probably put overlayfs on top of NFS to allow local modifications.
    – Mic92
    May 22 at 15:13











  • The nixos iso also shows how readonly and read-write layers can be overlayed: github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/…
    – Mic92
    May 22 at 15:17











  • Only having a single read-only /nix/store has it caveats as the nix store also store configuration files. Sharing the same elastic filesystem could work so, if your network storage implements posix file locking. nix-collect-garbage usually relies on seeing other processes using files - in a distributed settings it might delete files in use.
    – Mic92
    May 22 at 15:21















up vote
0
down vote

favorite












I am using nixops and want to reduce disk space consumption by sharing nix store among instances.



Possible implementation:



  • share /nix/store store through elastic file system.

  • make cron job on random machine inside network that runs nix-collect-garbage -d. This will remove all packages that are not linked with first machine: actually stale packages and packages of other machines inside network. To restore them first machine triggers nixos-rebuild switch on other machines inside network.

Can this be done better/does this make sense?




aws nixos nix




share|improve this question


















  • 1




    Not sure if this works for NixOS, but I once shared the nix store via NFS: nixos.wiki/wiki/NFS#Nix_store_on_NFS You could probably put overlayfs on top of NFS to allow local modifications.
    – Mic92
    May 22 at 15:13











  • The nixos iso also shows how readonly and read-write layers can be overlayed: github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/…
    – Mic92
    May 22 at 15:17











  • Only having a single read-only /nix/store has it caveats as the nix store also store configuration files. Sharing the same elastic filesystem could work so, if your network storage implements posix file locking. nix-collect-garbage usually relies on seeing other processes using files - in a distributed settings it might delete files in use.
    – Mic92
    May 22 at 15:21













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I am using nixops and want to reduce disk space consumption by sharing nix store among instances.



Possible implementation:



  • share /nix/store store through elastic file system.

  • make cron job on random machine inside network that runs nix-collect-garbage -d. This will remove all packages that are not linked with first machine: actually stale packages and packages of other machines inside network. To restore them first machine triggers nixos-rebuild switch on other machines inside network.

Can this be done better/does this make sense?




aws nixos nix




share|improve this question














I am using nixops and want to reduce disk space consumption by sharing nix store among instances.



Possible implementation:



  • share /nix/store store through elastic file system.

  • make cron job on random machine inside network that runs nix-collect-garbage -d. This will remove all packages that are not linked with first machine: actually stale packages and packages of other machines inside network. To restore them first machine triggers nixos-rebuild switch on other machines inside network.

Can this be done better/does this make sense?





aws nixos nix





share|improve this question













share|improve this question




share|improve this question








edited Jan 3 at 20:45









Jeff Schaller

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asked Jan 3 at 20:23









srghma

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  • 1




    Not sure if this works for NixOS, but I once shared the nix store via NFS: nixos.wiki/wiki/NFS#Nix_store_on_NFS You could probably put overlayfs on top of NFS to allow local modifications.
    – Mic92
    May 22 at 15:13











  • The nixos iso also shows how readonly and read-write layers can be overlayed: github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/…
    – Mic92
    May 22 at 15:17











  • Only having a single read-only /nix/store has it caveats as the nix store also store configuration files. Sharing the same elastic filesystem could work so, if your network storage implements posix file locking. nix-collect-garbage usually relies on seeing other processes using files - in a distributed settings it might delete files in use.
    – Mic92
    May 22 at 15:21













  • 1




    Not sure if this works for NixOS, but I once shared the nix store via NFS: nixos.wiki/wiki/NFS#Nix_store_on_NFS You could probably put overlayfs on top of NFS to allow local modifications.
    – Mic92
    May 22 at 15:13











  • The nixos iso also shows how readonly and read-write layers can be overlayed: github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/…
    – Mic92
    May 22 at 15:17











  • Only having a single read-only /nix/store has it caveats as the nix store also store configuration files. Sharing the same elastic filesystem could work so, if your network storage implements posix file locking. nix-collect-garbage usually relies on seeing other processes using files - in a distributed settings it might delete files in use.
    – Mic92
    May 22 at 15:21








1




1




Not sure if this works for NixOS, but I once shared the nix store via NFS: nixos.wiki/wiki/NFS#Nix_store_on_NFS You could probably put overlayfs on top of NFS to allow local modifications.
– Mic92
May 22 at 15:13





Not sure if this works for NixOS, but I once shared the nix store via NFS: nixos.wiki/wiki/NFS#Nix_store_on_NFS You could probably put overlayfs on top of NFS to allow local modifications.
– Mic92
May 22 at 15:13













The nixos iso also shows how readonly and read-write layers can be overlayed: github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/…
– Mic92
May 22 at 15:17





The nixos iso also shows how readonly and read-write layers can be overlayed: github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/…
– Mic92
May 22 at 15:17













Only having a single read-only /nix/store has it caveats as the nix store also store configuration files. Sharing the same elastic filesystem could work so, if your network storage implements posix file locking. nix-collect-garbage usually relies on seeing other processes using files - in a distributed settings it might delete files in use.
– Mic92
May 22 at 15:21





Only having a single read-only /nix/store has it caveats as the nix store also store configuration files. Sharing the same elastic filesystem could work so, if your network storage implements posix file locking. nix-collect-garbage usually relies on seeing other processes using files - in a distributed settings it might delete files in use.
– Mic92
May 22 at 15:21
















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