make cluster-config

README.md

@@ -20,12 +20,17 @@ Then run
 make release
 ```
 
+Then run, follow the instructions
+```
+make cluster-config
+```
+
 ## Flashing
 
 #### USB Drive
 1. `make release`
 2. Format the USB in vfat
-3. Copy out/[RELEASE].img.gz and out/board.itb your usb drive's root
+3. Copy out/[RELEASE].img.gz and out/board.itb to your usb drive's root
 4. Run
 ```
 usb start

configs/cluster.env.default

@@ -0,0 +1,26 @@
+# Required
+KUBERNETES_VERSION=v1.35.3
+NODE_NAME=monok8s-master
+APISERVER_ADVERTISE_ADDRESS=192.168.1.50
+
+# Optional but strongly recommended
+CLUSTER_NAME=monok8s
+POD_SUBNET=10.244.0.0/16
+SERVICE_SUBNET=10.96.0.0/12
+CLUSTER_DOMAIN=cluster.local
+
+# Optional
+# Extra API server SANs, comma-separated
+SANS=127.0.0.1,localhost,monok8s-master
+
+# Single-node mode: allow workloads on the control plane
+ALLOW_SCHEDULING_ON_CONTROL_PLANE=yes
+
+# CRI-O socket
+CONTAINER_RUNTIME_ENDPOINT=unix:///var/run/crio/crio.sock
+
+# Usually leave this alone
+KUBECONFIG_USER_HOME=/root
+
+# Emergency override only
+SKIP_IMAGE_CHECK=no

makefile

@@ -16,6 +16,11 @@ KUBELET_BIN := $(PACKAGES_DIR)/kubernetes/kubelet
 KUBEADM_BIN := $(PACKAGES_DIR)/kubernetes/kubeadm
 KUBECTL_BIN := $(PACKAGES_DIR)/kubernetes/kubectl
 
+CONFIGS_DIR          := configs
+SCRIPTS_DIR          := scripts
+CLUSTER_ENV_DEFAULT  := $(CONFIGS_DIR)/cluster.env.default
+CLUSTER_ENV          := $(OUT_DIR)/cluster.env
+
 BOARD_ITB     := $(OUT_DIR)/board.itb
 INITRAMFS     := $(OUT_DIR)/initramfs.cpio.gz
 RELEASE_IMAGE := $(OUT_DIR)/monok8s-$(TAG).img.gz
@@ -101,9 +106,6 @@ $(KUBEADM_BIN): | $(PACKAGES_DIR)
 $(KUBECTL_BIN): | $(PACKAGES_DIR)
 	curl -L -o $@ "https://dl.k8s.io/$(KUBE_VERSION)/bin/linux/$(ARCH)/kubectl"
 
-$(KUBEADM_BIN): | $(PACKAGES_DIR)
-	curl -L -o $@ "https://dl.k8s.io/$(KUBE_VERSION)/bin/linux/$(ARCH)/kubeadm"
-
 $(BUSYBOX_TAR): | $(PACKAGES_DIR)
 	curl -L -o $@ "https://github.com/mirror/busybox/archive/refs/tags/$(BUSYBOX_VERSION).tar.gz"
 
@@ -217,6 +219,17 @@ check-functions:
 	@echo "Missing functions:"
 	@comm -23 /tmp/called.txt /tmp/defined.txt || true
 
+# ---- cluster targets ------------------------------------------------------------
+
+cluster-config: $(CLUSTER_ENV_DEFAULT) $(SCRIPTS_DIR)/merge-env.sh | $(OUT_DIR)
+	sh $(SCRIPTS_DIR)/merge-env.sh $(CLUSTER_ENV_DEFAULT) $(CLUSTER_ENV)
+
+cluster-defconfig: $(CLUSTER_ENV_DEFAULT) | $(OUT_DIR)
+	cp $(CLUSTER_ENV_DEFAULT) $(CLUSTER_ENV)
+
+cluster-print:
+	@cat $(CLUSTER_ENV)
+
 # ---- User targets ------------------------------------------------------------
 
 release: $(RELEASE_IMAGE)
@@ -240,4 +253,5 @@ distclean: clean
 pkgclean:
 	rm -rf $(PACKAGES_DIR)
 
-.PHONY: release kernel initramfs itb build-base clean distclean
+.PHONY: release kernel initramfs itb build-base clean distclean pkgclean \
+	cluster-config cluster-defconfig cluster-print

scripts/merge-env.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+set -eu
+
+INPUT="${1:?input file required}"
+OUTPUT="${2:?output file required}"
+
+mkdir -p "$(dirname "$OUTPUT")"
+
+awk '
+function trim(s) {
+    sub(/^[[:space:]]+/, "", s)
+    sub(/[[:space:]]+$/, "", s)
+    return s
+}
+
+BEGIN {
+    for (k in ENVIRON) {
+        env[k] = ENVIRON[k]
+    }
+}
+
+/^[[:space:]]*#/ || /^[[:space:]]*$/ {
+    print
+    next
+}
+
+{
+    line = $0
+    eq = index(line, "=")
+
+    if (eq == 0) {
+        print line
+        next
+    }
+
+    key = trim(substr(line, 1, eq - 1))
+    val = substr(line, eq + 1)
+
+    if (key in env) {
+        print key "=" env[key]
+    } else {
+        print line
+    }
+}
+' "$INPUT" > "$OUTPUT"