diff options
Diffstat (limited to 'modules/private/system/dilion/vms.nix')
-rw-r--r-- | modules/private/system/dilion/vms.nix | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/modules/private/system/dilion/vms.nix b/modules/private/system/dilion/vms.nix new file mode 100644 index 0000000..8d5a57b --- /dev/null +++ b/modules/private/system/dilion/vms.nix | |||
@@ -0,0 +1,146 @@ | |||
1 | # inspired from https://nixos.wiki/wiki/Virtualization_in_NixOS | ||
2 | { config, pkgs, lib, ... }@args: | ||
3 | let | ||
4 | networks = { | ||
5 | immae = { | ||
6 | bridgeNumber = "1"; | ||
7 | ipRange = "192.168.100"; | ||
8 | }; | ||
9 | }; | ||
10 | guests = { | ||
11 | caldance = { | ||
12 | pool = "zfspool"; | ||
13 | cpus = "1"; | ||
14 | memory = "2"; | ||
15 | network = "immae"; | ||
16 | diskSize = "10GiB"; | ||
17 | extraDevicesXML = '' | ||
18 | <filesystem type="mount"> | ||
19 | <source dir="/var/lib/caldance"/> | ||
20 | <target dir="home"/> | ||
21 | </filesystem> | ||
22 | ''; | ||
23 | }; | ||
24 | buildbot = { | ||
25 | pool = "zfspool"; | ||
26 | cpus = "1"; | ||
27 | memory = "3"; | ||
28 | network = "immae"; | ||
29 | diskSize = "10GiB"; | ||
30 | destroyVolumeOnExit = true; | ||
31 | preStart = '' | ||
32 | if ! ${pkgs.libvirt}/bin/virsh pool-info --pool niximages &> /dev/null; then | ||
33 | pool-create-as --name niximages --type dir --target /etc/libvirtd/base-images/ | ||
34 | fi | ||
35 | if ! ${pkgs.libvirt}/bin/virsh pool-info --pool buildbot-disks &> /dev/null; then | ||
36 | mkdir -p /var/lib/libvirt/images/buildbot-disks | ||
37 | pool-create-as --name buildbot-disks --type dir --target /var/lib/libvirt/images/buildbot-disks | ||
38 | fi | ||
39 | ''; | ||
40 | }; | ||
41 | }; | ||
42 | toImage = f: "${import ./vms/base_image.nix f (args // { myEnv = config.myEnv; })}/nixos.qcow2"; | ||
43 | in | ||
44 | { | ||
45 | environment.etc."libvirtd/base-images/nixos.qcow2".source = toImage ./vms/base_configuration.nix; | ||
46 | environment.etc."libvirtd/base-images/buildbot.qcow2".source = toImage ./vms/buildbot_configuration.nix; | ||
47 | systemd.services = lib.mapAttrs' (name: guest: lib.nameValuePair "libvirtd-guest-${name}" { | ||
48 | after = [ "libvirtd.service" "libvirtd-network-${guest.network}.service" ]; | ||
49 | requires = [ "libvirtd.service" "libvirtd-network-${guest.network}.service" ]; | ||
50 | wantedBy = [ "multi-user.target" ]; | ||
51 | serviceConfig = { | ||
52 | Type = "oneshot"; | ||
53 | RemainAfterExit = "yes"; | ||
54 | }; | ||
55 | script = | ||
56 | let | ||
57 | xml = pkgs.writeText "libvirt-guest-${name}.xml" | ||
58 | '' | ||
59 | <domain type="kvm"> | ||
60 | <name>${name}</name> | ||
61 | <uuid>UUID</uuid> | ||
62 | <memory unit="GiB">${guest.memory}</memory> | ||
63 | <vcpu>${guest.cpus}</vcpu> | ||
64 | <os> | ||
65 | <type arch="x86_64">hvm</type> | ||
66 | </os> | ||
67 | <devices> | ||
68 | <emulator>/run/current-system/sw/bin/qemu-system-x86_64</emulator> | ||
69 | <disk type="volume"> | ||
70 | <source pool="${guest.pool}" volume="guest-${name}" /> | ||
71 | <target dev="vda" bus="virtio"/> | ||
72 | </disk> | ||
73 | ${guest.extraDevicesXML or ""} | ||
74 | <input type="keyboard" bus="usb"/> | ||
75 | <graphics type="vnc" port="-1" autoport="yes"/> | ||
76 | <interface type="network"> | ||
77 | <source network="${guest.network}" /> | ||
78 | </interface> | ||
79 | </devices> | ||
80 | <features> | ||
81 | <acpi/> | ||
82 | </features> | ||
83 | </domain> | ||
84 | ''; | ||
85 | in | ||
86 | guest.preStart or "" + '' | ||
87 | if ! ${pkgs.libvirt}/bin/virsh vol-key 'guest-${name}' --pool ${guest.pool} &> /dev/null; then | ||
88 | ${pkgs.libvirt}/bin/virsh vol-create-as --pool ${guest.pool} --name 'guest-${name}' --capacity '${guest.diskSize}' | ||
89 | volume_path=$(${pkgs.libvirt}/bin/virsh vol-path --pool ${guest.pool} --vol 'guest-${name}') | ||
90 | ${pkgs.qemu}/bin/qemu-img convert /etc/libvirtd/base-images/nixos.qcow2 $volume_path | ||
91 | fi | ||
92 | uuid="$(${pkgs.libvirt}/bin/virsh domuuid '${name}' || true)" | ||
93 | ${pkgs.libvirt}/bin/virsh define <(sed "s/UUID/$uuid/" '${xml}') | ||
94 | ${pkgs.libvirt}/bin/virsh start '${name}' | ||
95 | ''; | ||
96 | preStop = '' | ||
97 | ${pkgs.libvirt}/bin/virsh shutdown '${name}' | ||
98 | let "timeout = $(date +%s) + 10" | ||
99 | while [ "$(${pkgs.libvirt}/bin/virsh list --name | grep --count '^${name}$')" -gt 0 ]; do | ||
100 | if [ "$(date +%s)" -ge "$timeout" ]; then | ||
101 | # Meh, we warned it... | ||
102 | ${pkgs.libvirt}/bin/virsh destroy '${name}' | ||
103 | else | ||
104 | # The machine is still running, let's give it some time to shut down | ||
105 | sleep 0.5 | ||
106 | fi | ||
107 | done | ||
108 | '' + lib.optionalString (guest.destroyVolumeOnExit or false) '' | ||
109 | if ${pkgs.libvirt}/bin/virsh vol-key 'guest-${name}' --pool ${guest.pool} &> /dev/null; then | ||
110 | ${pkgs.libvirt}/bin/virsh vol-wipe --pool ${guest.pool} --vol 'guest-${name}' || true | ||
111 | ${pkgs.libvirt}/bin/virsh vol-delete --pool ${guest.pool} --vol 'guest-${name}' | ||
112 | fi | ||
113 | ''; | ||
114 | }) guests // (lib.mapAttrs' (name: network: lib.nameValuePair "libvirtd-network-${name}" { | ||
115 | after = [ "libvirtd.service" ]; | ||
116 | requires = [ "libvirtd.service" ]; | ||
117 | wantedBy = [ "multi-user.target" ]; | ||
118 | serviceConfig = { | ||
119 | Type = "oneshot"; | ||
120 | RemainAfterExit = "yes"; | ||
121 | }; | ||
122 | script = let | ||
123 | xml = pkgs.writeText "libvirt-network-${name}.xml" '' | ||
124 | <network> | ||
125 | <name>${name}</name> | ||
126 | <uuid>UUID</uuid> | ||
127 | <forward mode='nat' /> | ||
128 | <bridge name='virbr${network.bridgeNumber}' /> | ||
129 | <domain name='${name}' localOnly='yes'/> | ||
130 | <ip address='${network.ipRange}.1' netmask='255.255.255.0'> | ||
131 | <dhcp> | ||
132 | <range start='${network.ipRange}.2' end='${network.ipRange}.254'/> | ||
133 | </dhcp> | ||
134 | </ip> | ||
135 | </network> | ||
136 | ''; | ||
137 | in '' | ||
138 | uuid="$(${pkgs.libvirt}/bin/virsh net-uuid '${name}' || true)" | ||
139 | ${pkgs.libvirt}/bin/virsh net-define <(sed "s/UUID/$uuid/" '${xml}') | ||
140 | ${pkgs.libvirt}/bin/virsh net-start '${name}' | ||
141 | ''; | ||
142 | preStop = '' | ||
143 | ${pkgs.libvirt}/bin/virsh net-destroy '${name}' | ||
144 | ''; | ||
145 | }) networks); | ||
146 | } | ||