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update borgmatic config to backup btrfs subvolume

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This commit is contained in:
Pim Kunis 2024-01-04 22:52:31 +01:00
parent 5884585b3a
commit fc2da07613
1 changed files with 32 additions and 35 deletions
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67
nixos/modules/backups.nix
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@ -1,39 +1,28 @@
{ pkgs, lib, config, ... }: { pkgs, lib, config, ... }:
let let
cfg = config.lab.backups; cfg = config.lab.backups;
snapshotFile = "/tmp/snapshot.qcow2";
snapshotMount = "/tmp/snapshot";
beforeEverything = pkgs.writeShellScriptBin "beforeEverything" '' beforeEverything = pkgs.writeShellScriptBin "beforeEverything" ''
${pkgs.libvirt}/bin/virsh snapshot-create-as --domain ${cfg.domainName} --name backup-${cfg.domainName} --disk-only --quiesce --no-metadata --diskspec vda,snapshot=no --diskspec vdb,file=${snapshotFile} && ${pkgs.coreutils}/bin/sleep 1 if [ -d "${cfg.snapshotLocation}" ]; then
${pkgs.coreutils}/bin/mkdir -p ${snapshotMount} ${pkgs.btrfs-progs}/bin/btrfs subvolume delete ${cfg.snapshotLocation}
${pkgs.libguestfs-with-appliance}/bin/guestmount -a ${snapshotFile} -m /dev/sda1 --ro ${snapshotMount} fi
'';
afterEverything = pkgs.writeShellScriptBin "afterEverything" '' ${pkgs.btrfs-progs}/bin/btrfs subvolume snapshot -r ${cfg.subvolumeLocation} ${cfg.snapshotLocation}
set +e
${pkgs.coreutils}/bin/sleep 10
${pkgs.libguestfs-with-appliance}/bin/guestunmount ${snapshotMount} && ${pkgs.coreutils}/bin/sleep 1
${pkgs.coreutils}/bin/rm -rf ${snapshotMount}
${pkgs.libvirt}/bin/virsh blockcommit ${cfg.domainName} vdb --active --verbose --pivot
${pkgs.coreutils}/bin/rm -f ${snapshotFile}
''; '';
borgmaticConfig = pkgs.writeTextFile { borgmaticConfig = pkgs.writeTextFile {
name = "borgmatic-config"; name = "borgmatic-config";
text = '' text = ''
source_directories: source_directories:
- ${snapshotMount} - ${cfg.snapshotLocation}
repositories: repositories:
- path: ${cfg.repoLocation} - path: ${cfg.repoLocation}
label: ${cfg.domainName} label: nfs
keep_daily: 7 keep_daily: 7
keep_weekly: 4 keep_weekly: 4
keep_monthly: 6 keep_monthly: 6
unknown_unencrypted_repo_access_is_ok: true unknown_unencrypted_repo_access_is_ok: true
before_everything: before_everything:
- ${beforeEverything}/bin/beforeEverything - ${beforeEverything}/bin/beforeEverything
after_everything:
- ${afterEverything}/bin/afterEverything
''; '';
}; };
in in
@ -48,33 +37,44 @@ in
}; };
repoLocation = lib.mkOption { repoLocation = lib.mkOption {
default = "${config.lab.dataDisk.mountPoint}/backups/thecloud-data.borg"; # TODO: maybe make sure data disk is enabled? is there an "ensure" method in nix?
default = "${config.lab.dataDisk.mountPoint}/backups/nfs.borg";
type = lib.types.str; type = lib.types.str;
description = '' description = ''
Location of the Borg repository to back up to. Location of the Borg repository to back up to.
''; '';
}; };
domainName = lib.mkOption { subvolumeLocation = lib.mkOption {
default = "thecloud"; default = "${config.lab.dataDisk.mountPoint}/nfs";
type = lib.types.str; type = lib.types.str;
description = '' description = ''
The name of the Libvirt domain with the data disk attached. Location of the btrfs subvolume holding the data.
'';
};
snapshotLocation = lib.mkOption {
default = "${config.lab.dataDisk.mountPoint}/nfs-backup";
type = lib.types.str;
description = ''
Location to (temporary) create a snapshot of the subvolume.
''; '';
}; };
}; };
config = lib.mkIf cfg.enable { config = lib.mkIf cfg.enable {
environment.systemPackages = with pkgs; [ libguestfs-with-appliance borgbackup ]; environment.systemPackages = with pkgs; [ borgbackup ];
# Converted from: # Converted from:
# https://github.com/borgmatic-collective/borgmatic/tree/84823dfb912db650936e3492f6ead7e0e0d32a0f/sample/systemd # https://github.com/borgmatic-collective/borgmatic/tree/84823dfb912db650936e3492f6ead7e0e0d32a0f/sample/systemd
systemd.services.borgmatic = { systemd.services.borgmatic = {
description = "borgmatic backup"; description = "borgmatic backup";
wants = [ "network-online.target" ]; wants = [ "network-online.target" ];
after = [ "network-online.target" ]; after = [ "network-online.target" ];
unitConfig = { unitConfig = {
ConditionACPower = true; ConditionACPower = true;
}; };
serviceConfig = { serviceConfig = {
Type = "oneshot"; Type = "oneshot";
Nice = 19; Nice = 19;
@ -85,22 +85,19 @@ in
Restart = "no"; Restart = "no";
LogRateLimitIntervalSec = 0; LogRateLimitIntervalSec = 0;
}; };
preStart = "${pkgs.coreutils}/bin/sleep 1m"; preStart = "${pkgs.coreutils}/bin/sleep 1m";
script = "${pkgs.systemd}/bin/systemd-inhibit --who=\"borgmatic\" --what=\"sleep:shutdown\" --why=\"Prevent interrupting scheduled backup\" ${pkgs.borgmatic}/bin/borgmatic --verbosity -2 --syslog-verbosity 1"; script = "${pkgs.systemd}/bin/systemd-inhibit --who=\"borgmatic\" --what=\"sleep:shutdown\" --why=\"Prevent interrupting scheduled backup\" ${pkgs.borgmatic}/bin/borgmatic --verbosity -2 --syslog-verbosity 1 -c ${borgmaticConfig}";
}; };
environment.etc."borgmatic/config.yaml" = { systemd.timers.borgmatic = {
source = borgmaticConfig; description = "Run borgmatic backup";
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = "*-*-* 3:00:00";
Persistent = true;
RandomizedDelaySec = "3h";
};
}; };
# systemd.timers.borgmatic = {
# description = "Run borgmatic backup";
# wantedBy = [ "timers.target" ];
# timerConfig = {
# OnCalendar = "*-*-* 3:00:00";
# Persistent = true;
# RandomizedDelaySec = "3h";
# };
# };
}; };
} }