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authorGregor Kleen <gkleen@yggdrasil.li>2021-05-29 15:18:04 +0200
committerGregor Kleen <gkleen@yggdrasil.li>2021-05-29 15:18:04 +0200
commit333d4bcf563d8bc341460a5ff5e47c7fa36ddc4a (patch)
tree82f9c823b587c0c423192eeed026f172f52eb431 /hosts
parent28e1cd3729bd39e34c5c0aabda3b5d53d4877133 (diff)
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surtr: zfs snapshots
Diffstat (limited to 'hosts')
-rw-r--r--hosts/surtr/default.nix34
-rw-r--r--hosts/surtr/zfs.nix89
2 files changed, 94 insertions, 29 deletions
diff --git a/hosts/surtr/default.nix b/hosts/surtr/default.nix
index ba304e22..8cbb51ef 100644
--- a/hosts/surtr/default.nix
+++ b/hosts/surtr/default.nix
@@ -1,7 +1,7 @@
1{ flake, pkgs, ... }: 1{ flake, pkgs, ... }:
2{ 2{
3 imports = with flake.nixosModules.systemProfiles; [ 3 imports = with flake.nixosModules.systemProfiles; [
4 qemu-guest openssh rebuild-machines 4 qemu-guest openssh rebuild-machines ./zfs.nix
5 ]; 5 ];
6 6
7 config = { 7 config = {
@@ -24,7 +24,10 @@
24 tmpOnTmpfs = true; 24 tmpOnTmpfs = true;
25 25
26 supportedFilesystems = [ "zfs" ]; 26 supportedFilesystems = [ "zfs" ];
27 zfs.devNodes = "/dev"; # /dev/vda2 does not show up in /dev/disk/by-id 27 zfs = {
28 enableUnstable = true;
29 devNodes = "/dev"; # /dev/vda2 does not show up in /dev/disk/by-id
30 };
28 }; 31 };
29 32
30 fileSystems = { 33 fileSystems = {
@@ -37,33 +40,6 @@
37 { device = "/dev/disk/by-label/boot"; 40 { device = "/dev/disk/by-label/boot";
38 fsType = "vfat"; 41 fsType = "vfat";
39 }; 42 };
40
41 "/nix" =
42 { device = "surtr/local/nix";
43 fsType = "zfs";
44 };
45
46 "/root" =
47 { device = "surtr/safe/home-root";
48 fsType = "zfs";
49 neededForBoot = true;
50 };
51
52 "/var/lib/systemd" =
53 { device = "surtr/local/var-lib-systemd";
54 fsType = "zfs";
55 neededForBoot = true;
56 };
57
58 "/var/log" =
59 { device = "surtr/local/var-log";
60 fsType = "zfs";
61 };
62
63 "/home" =
64 { device = "surtr/safe/home";
65 fsType = "zfs";
66 };
67 }; 43 };
68 44
69 networking = { 45 networking = {
diff --git a/hosts/surtr/zfs.nix b/hosts/surtr/zfs.nix
new file mode 100644
index 00000000..72cc79e3
--- /dev/null
+++ b/hosts/surtr/zfs.nix
@@ -0,0 +1,89 @@
1{ pkgs, config, ... }:
2let
3 snapshotNames = ["frequent" "hourly" "daily" "monthly" "yearly"];
4 snapshotCount = {
5 frequent = 24;
6 hourly = 24;
7 daily = 30;
8 monthly = 12;
9 yearly = 5;
10 };
11 snapshotTimerConfig = {
12 frequent = { OnCalendar = "*:0/5"; Persistent = true; };
13 hourly = { OnCalendar = "hourly"; Persistent = true; };
14 daily = { OnCalendar = "daily"; Persistent = true; };
15 monthly = { OnCalendar = "monthly"; Persistent = true; };
16 yearly = { OnCalendar = "yearly"; Persistent = true; };
17 };
18 snapshotDescr = {
19 frequent = "few minutes";
20 hourly = "hour";
21 daily = "day";
22 monthly = "month";
23 yearly = "year";
24 };
25
26 zfs = config.boot.zfs.package;
27
28 autosnapPackage = pkgs.zfstools.override { inherit zfs; };
29in {
30 config = {
31 fileSystems = {
32 "/nix" =
33 { device = "surtr/local/nix";
34 fsType = "zfs";
35 };
36
37 "/root" =
38 { device = "surtr/safe/home-root";
39 fsType = "zfs";
40 neededForBoot = true;
41 };
42
43 "/var/lib/systemd" =
44 { device = "surtr/local/var-lib-systemd";
45 fsType = "zfs";
46 neededForBoot = true;
47 };
48
49 "/var/log" =
50 { device = "surtr/local/var-log";
51 fsType = "zfs";
52 };
53
54 "/home" =
55 { device = "surtr/safe/home";
56 fsType = "zfs";
57 };
58 };
59
60 systemd.services =
61 let mkSnapService = snapName: {
62 name = "zfs-snapshot-${snapName}";
63 value = {
64 description = "ZFS auto-snapshot every ${snapshotDescr.${snapName}}";
65 after = [ "zfs-import.target" ];
66 serviceConfig = {
67 Type = "oneshot";
68 ExecStart = "${autosnapPackage}/bin/zfs-auto-snapshot -k -p -u ${snapName} ${toString snapshotCount.${snapName}}";
69 };
70 restartIfChanged = false;
71
72 preStart = ''
73 ${zfs}/bin/zfs set com.sun:auto-snapshot=true surtr/safe
74 '';
75 };
76 };
77 in builtins.listToAttrs (map mkSnapService snapshotNames);
78
79 systemd.timers =
80 let mkSnapTimer = snapName: {
81 name = "zfs-snapshot-${snapName}";
82 value = {
83 wantedBy = [ "timers.target" ];
84 timerConfig = snapshotTimerConfig.${snapName};
85 };
86 };
87 in builtins.listToAttrs (map mkSnapTimer snapshotNames);
88 };
89}