mirror of
https://github.com/ilyakooo0/nixpkgs.git
synced 2024-12-26 21:33:03 +03:00
Merge pull request #49516 from johanot/kubedns-to-coredns
nixos/kubernetes: KubeDNS -> CoreDNS
This commit is contained in:
Sarah Brofeldt
GitHub
commit
81de3e39b0
@ -224,6 +224,19 @@
|
||||
supports loading TrueCrypt volumes.
|
||||
</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>
|
||||
The Kubernetes DNS addons, kube-dns, has been replaced with CoreDNS.
|
||||
This change is made in accordance with Kubernetes making CoreDNS the official default
|
||||
starting from
|
||||
<link xlink:href="https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.11.md#sig-cluster-lifecycle">Kubernetes v1.11</link>.
|
||||
Please beware that upgrading DNS-addon on existing clusters might induce
|
||||
minor downtime while the DNS-addon terminates and re-initializes.
|
||||
Also note that the DNS-service now runs with 2 pod replicas by default.
|
||||
The desired number of replicas can be configured using:
|
||||
<option>services.kubernetes.addons.dns.replicas</option>.
|
||||
</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
@ -3,8 +3,13 @@
|
||||
with lib;
|
||||
|
||||
let
|
||||
version = "1.14.10";
|
||||
version = "1.2.5";
|
||||
cfg = config.services.kubernetes.addons.dns;
|
||||
ports = {
|
||||
dns = 10053;
|
||||
health = 10054;
|
||||
metrics = 10055;
|
||||
};
|
||||
in {
|
||||
options.services.kubernetes.addons.dns = {
|
||||
enable = mkEnableOption "kubernetes dns addon";
|
||||
@ -27,49 +32,130 @@ in {
|
||||
type = types.str;
|
||||
};
|
||||
|
||||
kube-dns = mkOption {
|
||||
description = "Docker image to seed for the kube-dns main container.";
|
||||
type = types.attrs;
|
||||
default = {
|
||||
imageName = "k8s.gcr.io/k8s-dns-kube-dns-amd64";
|
||||
imageDigest = "sha256:b99fc3eee2a9f052f7eb4cc00f15eb12fc405fa41019baa2d6b79847ae7284a8";
|
||||
finalImageTag = version;
|
||||
sha256 = "0x583znk9smqn0fix7ld8sm5jgaxhqhx3fq97b1wkqm7iwhvl3pj";
|
||||
};
|
||||
replicas = mkOption {
|
||||
description = "Number of DNS pod replicas to deploy in the cluster.";
|
||||
default = 2;
|
||||
type = types.int;
|
||||
};
|
||||
|
||||
dnsmasq-nanny = mkOption {
|
||||
description = "Docker image to seed for the kube-dns dnsmasq container.";
|
||||
coredns = mkOption {
|
||||
description = "Docker image to seed for the CoreDNS container.";
|
||||
type = types.attrs;
|
||||
default = {
|
||||
imageName = "k8s.gcr.io/k8s-dns-dnsmasq-nanny-amd64";
|
||||
imageDigest = "sha256:bbb2a290a568125b3b996028958eb773f33b5b87a6b37bf38a28f8b62dddb3c8";
|
||||
imageName = "coredns/coredns";
|
||||
imageDigest = "sha256:33c8da20b887ae12433ec5c40bfddefbbfa233d5ce11fb067122e68af30291d6";
|
||||
finalImageTag = version;
|
||||
sha256 = "1fihml7s2mfwgac51cbqpylkwbivc8nyhgi4vb820s83zvl8a6y1";
|
||||
};
|
||||
};
|
||||
|
||||
sidecar = mkOption {
|
||||
description = "Docker image to seed for the kube-dns sidecar container.";
|
||||
type = types.attrs;
|
||||
default = {
|
||||
imageName = "k8s.gcr.io/k8s-dns-sidecar-amd64";
|
||||
imageDigest = "sha256:4f1ab957f87b94a5ec1edc26fae50da2175461f00afecf68940c4aa079bd08a4";
|
||||
finalImageTag = version;
|
||||
sha256 = "08l1bv5jgrhvjzpqpbinrkgvv52snc4fzyd8ya9v18ns2klyz7m0";
|
||||
sha256 = "13q19rgwapv27xcs664dw502254yw4zw63insf6g2danidv2mg6i";
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
config = mkIf cfg.enable {
|
||||
services.kubernetes.kubelet.seedDockerImages = with pkgs.dockerTools; [
|
||||
(pullImage cfg.kube-dns)
|
||||
(pullImage cfg.dnsmasq-nanny)
|
||||
(pullImage cfg.sidecar)
|
||||
];
|
||||
services.kubernetes.kubelet.seedDockerImages =
|
||||
singleton (pkgs.dockerTools.pullImage cfg.coredns);
|
||||
|
||||
services.kubernetes.addonManager.addons = {
|
||||
kubedns-deployment = {
|
||||
coredns-sa = {
|
||||
apiVersion = "v1";
|
||||
kind = "ServiceAccount";
|
||||
metadata = {
|
||||
labels = {
|
||||
"addonmanager.kubernetes.io/mode" = "Reconcile";
|
||||
"k8s-app" = "kube-dns";
|
||||
"kubernetes.io/cluster-service" = "true";
|
||||
};
|
||||
name = "coredns";
|
||||
namespace = "kube-system";
|
||||
};
|
||||
};
|
||||
|
||||
coredns-cr = {
|
||||
apiVersion = "rbac.authorization.k8s.io/v1beta1";
|
||||
kind = "ClusterRole";
|
||||
metadata = {
|
||||
labels = {
|
||||
"addonmanager.kubernetes.io/mode" = "Reconcile";
|
||||
"k8s-app" = "kube-dns";
|
||||
"kubernetes.io/cluster-service" = "true";
|
||||
"kubernetes.io/bootstrapping" = "rbac-defaults";
|
||||
};
|
||||
name = "system:coredns";
|
||||
};
|
||||
rules = [
|
||||
{
|
||||
apiGroups = [ "" ];
|
||||
resources = [ "endpoints" "services" "pods" "namespaces" ];
|
||||
verbs = [ "list" "watch" ];
|
||||
}
|
||||
{
|
||||
apiGroups = [ "" ];
|
||||
resources = [ "nodes" ];
|
||||
verbs = [ "get" ];
|
||||
}
|
||||
];
|
||||
};
|
||||
|
||||
coredns-crb = {
|
||||
apiVersion = "rbac.authorization.k8s.io/v1beta1";
|
||||
kind = "ClusterRoleBinding";
|
||||
metadata = {
|
||||
annotations = {
|
||||
"rbac.authorization.kubernetes.io/autoupdate" = "true";
|
||||
};
|
||||
labels = {
|
||||
"addonmanager.kubernetes.io/mode" = "Reconcile";
|
||||
"k8s-app" = "kube-dns";
|
||||
"kubernetes.io/cluster-service" = "true";
|
||||
"kubernetes.io/bootstrapping" = "rbac-defaults";
|
||||
};
|
||||
name = "system:coredns";
|
||||
};
|
||||
roleRef = {
|
||||
apiGroup = "rbac.authorization.k8s.io";
|
||||
kind = "ClusterRole";
|
||||
name = "system:coredns";
|
||||
};
|
||||
subjects = [
|
||||
{
|
||||
kind = "ServiceAccount";
|
||||
name = "coredns";
|
||||
namespace = "kube-system";
|
||||
}
|
||||
];
|
||||
};
|
||||
|
||||
coredns-cm = {
|
||||
apiVersion = "v1";
|
||||
kind = "ConfigMap";
|
||||
metadata = {
|
||||
labels = {
|
||||
"addonmanager.kubernetes.io/mode" = "Reconcile";
|
||||
"k8s-app" = "kube-dns";
|
||||
"kubernetes.io/cluster-service" = "true";
|
||||
};
|
||||
name = "coredns";
|
||||
namespace = "kube-system";
|
||||
};
|
||||
data = {
|
||||
Corefile = ".:${toString ports.dns} {
|
||||
errors
|
||||
health :${toString ports.health}
|
||||
kubernetes ${cfg.clusterDomain} in-addr.arpa ip6.arpa {
|
||||
pods insecure
|
||||
upstream
|
||||
fallthrough in-addr.arpa ip6.arpa
|
||||
}
|
||||
prometheus :${toString ports.metrics}
|
||||
proxy . /etc/resolv.conf
|
||||
cache 30
|
||||
loop
|
||||
reload
|
||||
loadbalance
|
||||
}";
|
||||
};
|
||||
};
|
||||
|
||||
coredns-deploy = {
|
||||
apiVersion = "extensions/v1beta1";
|
||||
kind = "Deployment";
|
||||
metadata = {
|
||||
@ -77,182 +163,96 @@ in {
|
||||
"addonmanager.kubernetes.io/mode" = "Reconcile";
|
||||
"k8s-app" = "kube-dns";
|
||||
"kubernetes.io/cluster-service" = "true";
|
||||
"kubernetes.io/name" = "CoreDNS";
|
||||
};
|
||||
name = "kube-dns";
|
||||
name = "coredns";
|
||||
namespace = "kube-system";
|
||||
};
|
||||
spec = {
|
||||
selector.matchLabels."k8s-app" = "kube-dns";
|
||||
replicas = cfg.replicas;
|
||||
selector = {
|
||||
matchLabels = { k8s-app = "kube-dns"; };
|
||||
};
|
||||
strategy = {
|
||||
rollingUpdate = {
|
||||
maxSurge = "10%";
|
||||
maxUnavailable = 0;
|
||||
};
|
||||
rollingUpdate = { maxUnavailable = 1; };
|
||||
type = "RollingUpdate";
|
||||
};
|
||||
template = {
|
||||
metadata = {
|
||||
annotations."scheduler.alpha.kubernetes.io/critical-pod" = "";
|
||||
labels.k8s-app = "kube-dns";
|
||||
labels = {
|
||||
k8s-app = "kube-dns";
|
||||
};
|
||||
};
|
||||
spec = {
|
||||
priorityClassName = "system-cluster-critical";
|
||||
containers = [
|
||||
{
|
||||
name = "kubedns";
|
||||
image = with cfg.kube-dns; "${imageName}:${finalImageTag}";
|
||||
args = [ "-conf" "/etc/coredns/Corefile" ];
|
||||
image = with cfg.coredns; "${imageName}:${finalImageTag}";
|
||||
imagePullPolicy = "Never";
|
||||
livenessProbe = {
|
||||
failureThreshold = 5;
|
||||
httpGet = {
|
||||
path = "/health";
|
||||
port = ports.health;
|
||||
scheme = "HTTP";
|
||||
};
|
||||
initialDelaySeconds = 60;
|
||||
successThreshold = 1;
|
||||
timeoutSeconds = 5;
|
||||
};
|
||||
name = "coredns";
|
||||
ports = [
|
||||
{
|
||||
containerPort = ports.dns;
|
||||
name = "dns";
|
||||
protocol = "UDP";
|
||||
}
|
||||
{
|
||||
containerPort = ports.dns;
|
||||
name = "dns-tcp";
|
||||
protocol = "TCP";
|
||||
}
|
||||
{
|
||||
containerPort = ports.metrics;
|
||||
name = "metrics";
|
||||
protocol = "TCP";
|
||||
}
|
||||
];
|
||||
resources = {
|
||||
limits.memory = "170Mi";
|
||||
limits = {
|
||||
memory = "170Mi";
|
||||
};
|
||||
requests = {
|
||||
cpu = "100m";
|
||||
memory = "70Mi";
|
||||
};
|
||||
};
|
||||
livenessProbe = {
|
||||
failureThreshold = 5;
|
||||
httpGet = {
|
||||
path = "/healthcheck/kubedns";
|
||||
port = 10054;
|
||||
scheme = "HTTP";
|
||||
};
|
||||
initialDelaySeconds = 60;
|
||||
successThreshold = 1;
|
||||
timeoutSeconds = 5;
|
||||
};
|
||||
readinessProbe = {
|
||||
httpGet = {
|
||||
path = "/readiness";
|
||||
port = 8081;
|
||||
scheme = "HTTP";
|
||||
};
|
||||
initialDelaySeconds = 3;
|
||||
timeoutSeconds = 5;
|
||||
};
|
||||
args = [
|
||||
"--domain=${cfg.clusterDomain}"
|
||||
"--dns-port=10053"
|
||||
"--config-dir=/kube-dns-config"
|
||||
"--v=2"
|
||||
];
|
||||
env = [
|
||||
{
|
||||
name = "PROMETHEUS_PORT";
|
||||
value = "10055";
|
||||
}
|
||||
];
|
||||
ports = [
|
||||
{
|
||||
containerPort = 10053;
|
||||
name = "dns-local";
|
||||
protocol = "UDP";
|
||||
}
|
||||
{
|
||||
containerPort = 10053;
|
||||
name = "dns-tcp-local";
|
||||
protocol = "TCP";
|
||||
}
|
||||
{
|
||||
containerPort = 10055;
|
||||
name = "metrics";
|
||||
protocol = "TCP";
|
||||
}
|
||||
];
|
||||
volumeMounts = [
|
||||
{
|
||||
mountPath = "/kube-dns-config";
|
||||
name = "kube-dns-config";
|
||||
}
|
||||
];
|
||||
}
|
||||
{
|
||||
name = "dnsmasq";
|
||||
image = with cfg.dnsmasq-nanny; "${imageName}:${finalImageTag}";
|
||||
livenessProbe = {
|
||||
httpGet = {
|
||||
path = "/healthcheck/dnsmasq";
|
||||
port = 10054;
|
||||
scheme = "HTTP";
|
||||
};
|
||||
initialDelaySeconds = 60;
|
||||
timeoutSeconds = 5;
|
||||
successThreshold = 1;
|
||||
failureThreshold = 5;
|
||||
};
|
||||
args = [
|
||||
"-v=2"
|
||||
"-logtostderr"
|
||||
"-configDir=/etc/k8s/dns/dnsmasq-nanny"
|
||||
"-restartDnsmasq=true"
|
||||
"--"
|
||||
"-k"
|
||||
"--cache-size=1000"
|
||||
"--log-facility=-"
|
||||
"--server=/${cfg.clusterDomain}/127.0.0.1#10053"
|
||||
"--server=/in-addr.arpa/127.0.0.1#10053"
|
||||
"--server=/ip6.arpa/127.0.0.1#10053"
|
||||
];
|
||||
ports = [
|
||||
{
|
||||
containerPort = 53;
|
||||
name = "dns";
|
||||
protocol = "UDP";
|
||||
}
|
||||
{
|
||||
containerPort = 53;
|
||||
name = "dns-tcp";
|
||||
protocol = "TCP";
|
||||
}
|
||||
];
|
||||
resources = {
|
||||
requests = {
|
||||
cpu = "150m";
|
||||
memory = "20Mi";
|
||||
securityContext = {
|
||||
allowPrivilegeEscalation = false;
|
||||
capabilities = {
|
||||
drop = [ "all" ];
|
||||
};
|
||||
readOnlyRootFilesystem = true;
|
||||
};
|
||||
volumeMounts = [
|
||||
{
|
||||
mountPath = "/etc/k8s/dns/dnsmasq-nanny";
|
||||
name = "kube-dns-config";
|
||||
mountPath = "/etc/coredns";
|
||||
name = "config-volume";
|
||||
readOnly = true;
|
||||
}
|
||||
];
|
||||
}
|
||||
{
|
||||
name = "sidecar";
|
||||
image = with cfg.sidecar; "${imageName}:${finalImageTag}";
|
||||
livenessProbe = {
|
||||
httpGet = {
|
||||
path = "/metrics";
|
||||
port = 10054;
|
||||
scheme = "HTTP";
|
||||
};
|
||||
initialDelaySeconds = 60;
|
||||
timeoutSeconds = 5;
|
||||
successThreshold = 1;
|
||||
failureThreshold = 5;
|
||||
};
|
||||
args = [
|
||||
"--v=2"
|
||||
"--logtostderr"
|
||||
"--probe=kubedns,127.0.0.1:10053,kubernetes.default.svc.${cfg.clusterDomain},5,A"
|
||||
"--probe=dnsmasq,127.0.0.1:53,kubernetes.default.svc.${cfg.clusterDomain},5,A"
|
||||
];
|
||||
ports = [
|
||||
{
|
||||
containerPort = 10054;
|
||||
name = "metrics";
|
||||
protocol = "TCP";
|
||||
}
|
||||
];
|
||||
resources = {
|
||||
requests = {
|
||||
cpu = "10m";
|
||||
memory = "20Mi";
|
||||
};
|
||||
};
|
||||
}
|
||||
];
|
||||
dnsPolicy = "Default";
|
||||
serviceAccountName = "kube-dns";
|
||||
nodeSelector = {
|
||||
"beta.kubernetes.io/os" = "linux";
|
||||
};
|
||||
serviceAccountName = "coredns";
|
||||
tolerations = [
|
||||
{
|
||||
effect = "NoSchedule";
|
||||
key = "node-role.kubernetes.io/master";
|
||||
}
|
||||
{
|
||||
key = "CriticalAddonsOnly";
|
||||
operator = "Exists";
|
||||
@ -261,10 +261,15 @@ in {
|
||||
volumes = [
|
||||
{
|
||||
configMap = {
|
||||
name = "kube-dns";
|
||||
optional = true;
|
||||
items = [
|
||||
{
|
||||
key = "Corefile";
|
||||
path = "Corefile";
|
||||
}
|
||||
];
|
||||
name = "coredns";
|
||||
};
|
||||
name = "kube-dns-config";
|
||||
name = "config-volume";
|
||||
}
|
||||
];
|
||||
};
|
||||
@ -272,51 +277,40 @@ in {
|
||||
};
|
||||
};
|
||||
|
||||
kubedns-svc = {
|
||||
coredns-svc = {
|
||||
apiVersion = "v1";
|
||||
kind = "Service";
|
||||
metadata = {
|
||||
annotations = {
|
||||
"prometheus.io/port" = toString ports.metrics;
|
||||
"prometheus.io/scrape" = "true";
|
||||
};
|
||||
labels = {
|
||||
"addonmanager.kubernetes.io/mode" = "Reconcile";
|
||||
"k8s-app" = "kube-dns";
|
||||
"kubernetes.io/cluster-service" = "true";
|
||||
"kubernetes.io/name" = "KubeDNS";
|
||||
"kubernetes.io/name" = "CoreDNS";
|
||||
};
|
||||
name = "kube-dns";
|
||||
namespace = "kube-system";
|
||||
namespace = "kube-system";
|
||||
};
|
||||
spec = {
|
||||
clusterIP = cfg.clusterIp;
|
||||
ports = [
|
||||
{name = "dns"; port = 53; protocol = "UDP";}
|
||||
{name = "dns-tcp"; port = 53; protocol = "TCP";}
|
||||
{
|
||||
name = "dns";
|
||||
port = 53;
|
||||
targetPort = ports.dns;
|
||||
protocol = "UDP";
|
||||
}
|
||||
{
|
||||
name = "dns-tcp";
|
||||
port = 53;
|
||||
targetPort = ports.dns;
|
||||
protocol = "TCP";
|
||||
}
|
||||
];
|
||||
selector.k8s-app = "kube-dns";
|
||||
};
|
||||
};
|
||||
|
||||
kubedns-sa = {
|
||||
apiVersion = "v1";
|
||||
kind = "ServiceAccount";
|
||||
metadata = {
|
||||
name = "kube-dns";
|
||||
namespace = "kube-system";
|
||||
labels = {
|
||||
"kubernetes.io/cluster-service" = "true";
|
||||
"addonmanager.kubernetes.io/mode" = "Reconcile";
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
kubedns-cm = {
|
||||
apiVersion = "v1";
|
||||
kind = "ConfigMap";
|
||||
metadata = {
|
||||
name = "kube-dns";
|
||||
namespace = "kube-system";
|
||||
labels = {
|
||||
"addonmanager.kubernetes.io/mode" = "EnsureExists";
|
||||
};
|
||||
selector = { k8s-app = "kube-dns"; };
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
@ -87,7 +87,7 @@ let
|
||||
# check if pods are running
|
||||
$machine1->waitUntilSucceeds("kubectl get pod redis | grep Running");
|
||||
$machine1->waitUntilSucceeds("kubectl get pod probe | grep Running");
|
||||
$machine1->waitUntilSucceeds("kubectl get pods -n kube-system | grep 'kube-dns.*3/3'");
|
||||
$machine1->waitUntilSucceeds("kubectl get pods -n kube-system | grep 'coredns.*1/1'");
|
||||
|
||||
# check dns on host (dnsmasq)
|
||||
$machine1->succeed("host redis.default.svc.cluster.local");
|
||||
@ -111,7 +111,7 @@ let
|
||||
# check if pods are running
|
||||
$machine1->waitUntilSucceeds("kubectl get pod redis | grep Running");
|
||||
$machine1->waitUntilSucceeds("kubectl get pod probe | grep Running");
|
||||
$machine1->waitUntilSucceeds("kubectl get pods -n kube-system | grep 'kube-dns.*3/3'");
|
||||
$machine1->waitUntilSucceeds("kubectl get pods -n kube-system | grep 'coredns.*1/1'");
|
||||
|
||||
# check dns on hosts (dnsmasq)
|
||||
$machine1->succeed("host redis.default.svc.cluster.local");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user