Lightweight Kubernetes
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#!/bin/bash
all_services=(
coredns
local-path-provisioner
metrics-server
traefik
)
export NUM_SERVERS=1
export NUM_AGENTS=1
export WAIT_SERVICES="${all_services[@]}"
export AGENT_ARGS="--selinux=true \
--protect-kernel-defaults=true \
--kubelet-arg=streaming-connection-idle-timeout=5m \
--kubelet-arg=make-iptables-util-chains=true"
export SERVER_ARGS="--selinux=true \
--protect-kernel-defaults=true \
--kubelet-arg=streaming-connection-idle-timeout=5m \
--kubelet-arg=make-iptables-util-chains=true \
--secrets-encryption=true \
--kube-apiserver-arg=audit-log-path=/tmp/audit-log \
--kube-apiserver-arg=audit-log-maxage=30 \
--kube-apiserver-arg=audit-log-maxbackup=10 \
--kube-apiserver-arg=audit-log-maxsize=100 \
--kube-apiserver-arg=enable-admission-plugins=NodeRestriction,NamespaceLifecycle,ServiceAccount \
--kube-apiserver-arg=admission-control-config-file=/opt/rancher/k3s/cluster-level-pss.yaml \
--kube-controller-manager-arg=terminated-pod-gc-threshold=10 \
--kube-controller-manager-arg=use-service-account-credentials=true"
# -- This test runs in docker mounting the docker socket,
# -- so we can't directly mount files into the test containers. Instead we have to
# -- run a dummy container with a volume, copy files into that volume, and then
# -- share it with the other containers that need the file.
cluster-pre-hook() {
mkdir -p $TEST_DIR/pause/0/metadata
local testID=$(basename $TEST_DIR)
local name=$(echo "k3s-pause-0-${testID,,}" | tee $TEST_DIR/pause/0/metadata/name)
export SERVER_DOCKER_ARGS="--mount type=volume,src=$name,dst=/opt/rancher/k3s"
docker run \
-d --name $name \
--hostname $name \
${SERVER_DOCKER_ARGS} \
rancher/mirrored-pause:3.6 \
>/dev/null
docker cp scripts/hardened/cluster-level-pss.yaml $name:/opt/rancher/k3s/cluster-level-pss.yaml
}
export -f cluster-pre-hook
# -- deploy and wait for a daemonset to run on all nodes, then wait a couple more
# -- seconds for traefik to see the service endpoints before testing.
start-test() {
find ./scripts/hardened/ -name 'hardened-k3s-*.yaml' -printf '-f\0%p\0' | xargs -tr0 kubectl create
kubectl rollout status daemonset/example --watch --timeout=5m
sleep 15
verify-ingress
verify-nodeport
}
export -f start-test
test-cleanup-hook(){
local testID=$(basename $TEST_DIR)
docker volume ls -q | grep -F ${testID,,} | xargs -r docker volume rm
}
export -f test-cleanup-hook
# -- confirm we can make a request through the ingress
verify-ingress() {
local ips=$(cat $TEST_DIR/{servers,agents}/*/metadata/ip)
local schemes="http https"
for ip in $ips; do
for scheme in $schemes; do
curl -vksf -H 'Host: example.com' ${scheme}://${ip}/
done
done
}
export -f verify-ingress
# -- confirm we can make a request through the nodeport service
verify-nodeport() {
local ips=$(cat $TEST_DIR/{servers,agents}/*/metadata/ip)
local ports=$(kubectl get service/example -o 'jsonpath={.spec.ports[*].nodePort}')
for ip in $ips; do
for port in $ports; do
curl -vksf -H 'Host: example.com' http://${ip}:${port}
done
done
}
export -f verify-nodeport
# --- create a basic cluster and check for functionality
LABEL=HARDENED run-test
cleanup-test-env