initial commit

build.sh

@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+
+# Ensure the helper image is built locally. If missing, build from the
+# Dockerfile adjacent to this script (same `contws` directory).
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+IMAGE_NAME="inftools-cn:latest"
+
+if ! docker image inspect "$IMAGE_NAME" >/dev/null 2>&1; then
+  echo "Docker image $IMAGE_NAME not found. Building from $script_dir/Dockerfile..."
+  docker build -t "$IMAGE_NAME" -f "$script_dir/Dockerfile" "$script_dir" || {
+    echo "Failed to build Docker image $IMAGE_NAME" >&2
+    exit 1
+  }
+fi
+
+# Check if the Docker network 'student-net' exists, if not, create it
+if ! docker network inspect student-net >/dev/null 2>&1; then
+  echo "Docker network 'student-net' not found. Creating it..."
+  docker network create student-net || {
+    echo "Failed to create Docker network 'student-net'" >&2
+    exit 1
+  }
+fi
+
+# docker ps | grep mycluster | wc -l
+# 2
+
+if docker ps | grep -q mycluster; then
+  echo "Cluster already exists. Skipping creation."
+  docker run --rm -it \
+    --network student-net \
+    -v /var/run/docker.sock:/var/run/docker.sock \
+    -v mykube:/root/.kube \
+    $IMAGE_NAME bash
+  exit 0
+fi
+
+# create cluster
+#
+# Capture k3d output and extract the load-balancer node name.
+# Example line in output: "INFO[0005] Starting node 'k3d-mycluster-serverlb'"
+#
+tmpfile=$(mktemp)
+# Stream docker output live to terminal and save it to a temp file for parsing
+docker run --rm \
+  --network student-net \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  -v mykube:/root/.kube \
+  $IMAGE_NAME k3d cluster create mycluster --network student-net 2>&1 | tee "$tmpfile"
+
+# Read captured output into a variable for parsing
+output=$(cat "$tmpfile")
+rm -f "$tmpfile"
+
+# Prefer the node name that contains 'serverlb' (most likely the LB),
+# otherwise fall back to the last "Starting node '..." match.
+# First try to find a line that includes 'serverlb'.
+LB_NODE=$(printf "%s" "$output" | grep "Starting node" | grep -E "serverlb" | sed -n "s/.*Starting node '\\([^']*\\)'.*/\\1/p" | head -n1 || true)
+
+if [ -z "$LB_NODE" ]; then
+  # Fallback: take the last Starting node match (in case serverlb isn't present)
+  LB_NODE=$(printf "%s" "$output" | sed -n "s/.*Starting node '\\([^']*\\)'.*/\\1/p" | tail -n1)
+fi
+
+if [ -n "$LB_NODE" ]; then
+  echo "Load balancer node: $LB_NODE"
+  export LB_NODE
+else
+  echo "Warning: could not parse load balancer node from k3d output" >&2
+fi
+
+# edit kubeconfig to use load-balancer node IP
+# server: https://0.0.0.0:40115
+# needs to be changed to be sed -i 's/:34791/:6443/g' ~/.kube/config
+# 0.0.0.0:40115 -> <LB_NODE_IP>:6443
+docker run --rm \
+  --network student-net \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  -v mykube:/root/.kube \
+  $IMAGE_NAME sed -i "s/0.0.0.0:[0-9]*/${LB_NODE}:6443/g" /root/.kube/config
+
+