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Install longhorn on k3s

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Introduce new storage standard with LVM
This commit is contained in:
Pim Kunis 2024-05-18 23:32:58 +02:00
parent 7e14a2cc13
commit a21a09ad6b
9 changed files with 257 additions and 69 deletions
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52
nixos-modules/k3s/default.nix
View file

@ -37,25 +37,45 @@ in {
};
config = lib.mkIf cfg.enable {
environment.systemPackages = with pkgs; [ k3s ];
environment.systemPackages = with pkgs; [
k3s
openiscsi # Required for Longhorn
nfs-utils # Required for Longhorn
jq # Required for Longhorn
];
networking = {
nftables.enable = lib.mkForce false;
firewall.enable = lib.mkForce false;
};
services.k3s =
let
serverFlags = "--tls-san ${config.networking.fqdn} --disable servicelb --cluster-cidr=10.42.0.0/16,2001:cafe:42::/56 --service-cidr=10.43.0.0/16,2001:cafe:43::/112";
in
{
services = {
k3s =
let
serverFlags = "--tls-san ${config.networking.fqdn} --disable servicelb --cluster-cidr=10.42.0.0/16,2001:cafe:42::/56 --service-cidr=10.43.0.0/16,2001:cafe:43::/112";
in
{
enable = true;
role = cfg.role;
tokenFile = config.age.secrets.k3s-server-token.path;
extraFlags = lib.mkIf (cfg.role == "server") serverFlags;
clusterInit = cfg.clusterInit;
serverAddr = lib.mkIf (! (cfg.serverAddr == null)) cfg.serverAddr;
};
# Required for Longhorn
openiscsi = {
enable = true;
role = cfg.role;
tokenFile = config.age.secrets.k3s-server-token.path;
extraFlags = lib.mkIf (cfg.role == "server") serverFlags;
clusterInit = cfg.clusterInit;
serverAddr = lib.mkIf (! (cfg.serverAddr == null)) cfg.serverAddr;
name = "iqn.2016-04.com.open-iscsi:${config.networking.fqdn}";
};
};
# HACK: Symlink binaries to /usr/local/bin such that Longhorn can find them
# when they use nsenter.
# https://github.com/longhorn/longhorn/issues/2166#issuecomment-1740179416
systemd.tmpfiles.rules = [
"L+ /usr/local/bin - - - - /run/current-system/sw/bin/"
];
system = lib.mkIf (cfg.role == "server") {
activationScripts = {
@ -73,11 +93,11 @@ in {
k3s-certs.text = ''
mkdir -p /var/lib/rancher/k3s/server/tls/etcd
ln -sf ${./k3s-ca/server-ca.crt} /var/lib/rancher/k3s/server/tls/server-ca.crt
ln -sf ${./k3s-ca/client-ca.crt} /var/lib/rancher/k3s/server/tls/client-ca.crt
ln -sf ${./k3s-ca/request-header-ca.crt} /var/lib/rancher/k3s/server/tls/request-header-ca.crt
ln -sf ${./k3s-ca/etcd/peer-ca.crt} /var/lib/rancher/k3s/server/tls/etcd/peer-ca.crt
ln -sf ${./k3s-ca/etcd/server-ca.crt} /var/lib/rancher/k3s/server/tls/etcd/server-ca.crt
cp -f ${./k3s-ca/server-ca.crt} /var/lib/rancher/k3s/server/tls/server-ca.crt
cp -f ${./k3s-ca/client-ca.crt} /var/lib/rancher/k3s/server/tls/client-ca.crt
cp -f ${./k3s-ca/request-header-ca.crt} /var/lib/rancher/k3s/server/tls/request-header-ca.crt
cp -f ${./k3s-ca/etcd/peer-ca.crt} /var/lib/rancher/k3s/server/tls/etcd/peer-ca.crt
cp -f ${./k3s-ca/etcd/server-ca.crt} /var/lib/rancher/k3s/server/tls/etcd/server-ca.crt
'';
};
};

131
nixos-modules/storage.nix
View file

@ -24,23 +24,126 @@ in {
Mount point of the machine's data partition.
'';
};
kubernetesNode = lib.mkOption {
default = false;
type = lib.types.bool;
description = ''
Whether to apply the Kubernetes disk setup.
'';
};
};
config = {
fileSystems = lib.attrsets.mergeAttrsList [
(lib.optionalAttrs (! machine.isRaspberryPi) {
"${cfg.dataMountPoint}".device = cfg.dataPartition;
})
(lib.optionalAttrs machine.isRaspberryPi {
"/" = {
device = "/dev/disk/by-label/NIXOS_SD";
fsType = "ext4";
options = [ "noatime" ];
};
})
];
fileSystems = {
"/" = lib.mkIf machine.isRaspberryPi {
device = "/dev/disk/by-label/NIXOS_SD";
fsType = "ext4";
options = [ "noatime" ];
};
};
disko = lib.mkIf (! machine.isRaspberryPi) {
disko = lib.mkIf (! machine.isRaspberryPi) (if cfg.kubernetesNode then {
devices = {
disk = {
nvme = {
device = "/dev/nvme0n1";
type = "disk";
content = {
type = "gpt";
partitions = {
boot = {
type = "EF00";
size = "500M";
content = {
type = "filesystem";
format = "vfat";
mountpoint = "/boot";
};
};
pv_os = {
size = "79G";
content = {
type = "lvm_pv";
vg = "vg_os";
};
};
pv_nvme_extra = {
size = "100%";
content = {
type = "lvm_pv";
vg = "vg_data";
};
};
};
};
};
sata = {
device = "/dev/sda";
type = "disk";
content = {
type = "gpt";
partitions.pv_sata = {
size = "100%";
content = {
type = "lvm_pv";
vg = "vg_data";
};
};
};
};
};
lvm_vg = {
vg_os = {
type = "lvm_vg";
lvs = {
root = {
size = "75G";
content = {
type = "filesystem";
format = "ext4";
mountpoint = "/";
mountOptions = [ "defaults" ];
};
};
swap = {
size = "100%FREE";
content.type = "swap";
};
};
};
vg_data = {
type = "lvm_vg";
lvs.longhorn = {
size = "100%FREE";
content = {
type = "filesystem";
format = "xfs";
mountpoint = "/mnt/longhorn";
};
};
};
};
};
} else {
# TODO: Rename this to 'osDisk'. Unfortunately, we would need to run nixos-anywhere again then.
devices.disk.vdb = {
device = cfg.osDisk;
@ -75,6 +178,6 @@ in {
};
};
};
};
});
};
}