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|
# A test that runs a multi-node k3s cluster and verify pod networking works across nodes
import ../make-test-python.nix (
{
pkgs,
lib,
k3s,
...
}:
let
imageEnv = pkgs.buildEnv {
name = "k3s-pause-image-env";
paths = with pkgs; [
tini
bashInteractive
coreutils
socat
];
};
pauseImage = pkgs.dockerTools.streamLayeredImage {
name = "test.local/pause";
tag = "local";
contents = imageEnv;
config.Entrypoint = [
"/bin/tini"
"--"
"/bin/sleep"
"inf"
];
};
# A daemonset that responds 'server' on port 8000
networkTestDaemonset = pkgs.writeText "test.yml" ''
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: test
labels:
name: test
spec:
selector:
matchLabels:
name: test
template:
metadata:
labels:
name: test
spec:
containers:
- name: test
image: test.local/pause:local
imagePullPolicy: Never
resources:
limits:
memory: 20Mi
command: ["socat", "TCP4-LISTEN:8000,fork", "EXEC:echo server"]
'';
tokenFile = pkgs.writeText "token" "p@s$w0rd";
in
{
name = "${k3s.name}-multi-node";
nodes = {
server =
{ pkgs, ... }:
{
environment.systemPackages = with pkgs; [
gzip
jq
];
# k3s uses enough resources the default vm fails.
virtualisation.memorySize = 1536;
virtualisation.diskSize = 4096;
services.k3s = {
inherit tokenFile;
enable = true;
role = "server";
package = k3s;
clusterInit = true;
extraFlags = [
"--disable coredns"
"--disable local-storage"
"--disable metrics-server"
"--disable servicelb"
"--disable traefik"
"--node-ip 192.168.1.1"
"--pause-image test.local/pause:local"
];
};
networking.firewall.allowedTCPPorts = [
2379
2380
6443
];
networking.firewall.allowedUDPPorts = [ 8472 ];
networking.firewall.trustedInterfaces = [ "flannel.1" ];
networking.useDHCP = false;
networking.defaultGateway = "192.168.1.1";
networking.interfaces.eth1.ipv4.addresses = pkgs.lib.mkForce [
{
address = "192.168.1.1";
prefixLength = 24;
}
];
};
server2 =
{ pkgs, ... }:
{
environment.systemPackages = with pkgs; [
gzip
jq
];
virtualisation.memorySize = 1536;
virtualisation.diskSize = 4096;
services.k3s = {
inherit tokenFile;
enable = true;
serverAddr = "https://192.168.1.1:6443";
clusterInit = false;
extraFlags = builtins.toString [
"--disable"
"coredns"
"--disable"
"local-storage"
"--disable"
"metrics-server"
"--disable"
"servicelb"
"--disable"
"traefik"
"--node-ip"
"192.168.1.3"
"--pause-image"
"test.local/pause:local"
];
};
networking.firewall.allowedTCPPorts = [
2379
2380
6443
];
networking.firewall.allowedUDPPorts = [ 8472 ];
networking.firewall.trustedInterfaces = [ "flannel.1" ];
networking.useDHCP = false;
networking.defaultGateway = "192.168.1.3";
networking.interfaces.eth1.ipv4.addresses = pkgs.lib.mkForce [
{
address = "192.168.1.3";
prefixLength = 24;
}
];
};
agent =
{ pkgs, ... }:
{
virtualisation.memorySize = 1024;
virtualisation.diskSize = 2048;
services.k3s = {
inherit tokenFile;
enable = true;
role = "agent";
serverAddr = "https://192.168.1.3:6443";
extraFlags = lib.concatStringsSep " " [
"--pause-image"
"test.local/pause:local"
"--node-ip"
"192.168.1.2"
];
};
networking.firewall.allowedTCPPorts = [ 6443 ];
networking.firewall.allowedUDPPorts = [ 8472 ];
networking.firewall.trustedInterfaces = [ "flannel.1" ];
networking.useDHCP = false;
networking.defaultGateway = "192.168.1.2";
networking.interfaces.eth1.ipv4.addresses = pkgs.lib.mkForce [
{
address = "192.168.1.2";
prefixLength = 24;
}
];
};
};
testScript = ''
machines = [server, server2, agent]
for m in machines:
m.start()
m.wait_for_unit("k3s")
is_aarch64 = "${toString pkgs.stdenv.hostPlatform.isAarch64}" == "1"
# wait for the agent to show up
server.wait_until_succeeds("k3s kubectl get node agent")
for m in machines:
m.succeed("k3s check-config")
m.succeed(
"${pauseImage} | k3s ctr image import -"
)
server.succeed("k3s kubectl cluster-info")
# Also wait for our service account to show up; it takes a sec
server.wait_until_succeeds("k3s kubectl get serviceaccount default")
# Now create a pod on each node via a daemonset and verify they can talk to each other.
server.succeed("k3s kubectl apply -f ${networkTestDaemonset}")
server.wait_until_succeeds(f'[ "$(k3s kubectl get ds test -o json | jq .status.numberReady)" -eq {len(machines)} ]')
# Get pod IPs
pods = server.succeed("k3s kubectl get po -o json | jq '.items[].metadata.name' -r").splitlines()
pod_ips = [server.succeed(f"k3s kubectl get po {name} -o json | jq '.status.podIP' -cr").strip() for name in pods]
# Verify each server can ping each pod ip
for pod_ip in pod_ips:
server.succeed(f"ping -c 1 {pod_ip}")
agent.succeed(f"ping -c 1 {pod_ip}")
# Verify the pods can talk to each other
resp = server.wait_until_succeeds(f"k3s kubectl exec {pods[0]} -- socat TCP:{pod_ips[1]}:8000 -")
assert resp.strip() == "server"
resp = server.wait_until_succeeds(f"k3s kubectl exec {pods[1]} -- socat TCP:{pod_ips[0]}:8000 -")
assert resp.strip() == "server"
# Cleanup
server.succeed("k3s kubectl delete -f ${networkTestDaemonset}")
for m in machines:
m.shutdown()
'';
meta.maintainers = lib.teams.k3s.members;
}
)
|
