Add script for generating kubernetes objects

generate_kubernetes_yaml.sh

@@ -0,0 +1,173 @@
+#!/usr/bin/env bash
+PROG="$0"
+USAGE="WORKER_1 [WORKER_2...]"
+
+errorout() {
+  echo "usage: ${PROG} -h" >&2
+  echo "  or   ${PROG} ${USAGE}" >&2
+  [ -n "$1" ] && echo "${PROG}: error: $@" >&2
+  exit 1
+}
+
+printhelp() {
+  cat <<EOF
+usage: ${PROG} ${USAGE}
+
+This generates some yaml that you can put in a file and apply to run in
+a kubernetes cluster. For example:
+
+    $PROG worker-{30..37}.macc.test
+
+That will generate the yaml to create 16 new deployments and 16 new
+services on 8 worker nodes, each configured to connect to each other
+node.
+
+positional arguments:
+ WORKER...  a complete list of worker nodes
+
+optional arguments:
+ -h         print this help text and exit
+EOF
+}
+
+while getopts ':hn:' opt; do
+  case "$opt" in
+    h)
+      printhelp
+      exit 0
+      ;;
+
+    ?)
+      errorout "unrecognized argument: \`-$opt'"
+      ;;
+  esac
+done
+shift $((OPTIND - 1))
+
+main() {
+  INDICATORS=`join_with_comma "$@"`
+  for node in "$@"; do
+    print_kubernetes "$node"
+  done
+}
+
+join_with_comma() {
+  echo -n "http://network-indicator-${1//./-}:4567"
+  shift
+  for i in "$@"; do
+    echo -n ",http://network-indicator-${i//./-}:4567"
+  done
+}
+
+print_kubernetes() {
+  cat <<EOF
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: network-indicator-${1//./-}
+spec:
+  selector:
+    matchLabels:
+      app: network-indicator
+      node: $1
+  template:
+    metadata:
+      labels:
+        app: network-indicator
+        node: $1
+    spec:
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+            - matchFields:
+              - key: metadata.name
+                operator: In
+                values:
+                - $1
+      containers:
+      - name: indicator
+        image: ghcr.io/mlibrary/kubernetes-network-test-indicator:1.0.0
+        env:
+        - name: RACK_ENV
+          value: production
+        ports:
+        - name: http
+          containerPort: 4567
+        livenessProbe:
+          httpGet:
+            path: /-/liveness
+            port: 4567
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: network-monitor-${1//./-}
+spec:
+  selector:
+    matchLabels:
+      app: network-monitor
+      node: $1
+  template:
+    metadata:
+      labels:
+        app: network-monitor
+        node: $1
+    spec:
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+            - matchFields:
+              - key: metadata.name
+                operator: In
+                values:
+                - $1
+      containers:
+      - name: monitor
+        image: ghcr.io/mlibrary/kubernetes-network-test-monitor:1.0.0
+        env:
+        - name: RACK_ENV
+          value: production
+        - name: INDICATORS
+          value: $INDICATORS
+        ports:
+        - name: http
+          containerPort: 4568
+        livenessProbe:
+          httpGet:
+            path: /-/liveness
+            port: 4568
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: network-indicator-${1//./-}
+spec:
+  selector:
+    app: network-indicator
+    node: $1
+  ports:
+  - name: http
+    port: 4567
+---
+apiVersion: v1
+kind: Service
+metadata:
+  annotations:
+    prometheus.io/scrape: "true"
+    prometheus.io/port: "4568"
+    prometheus.io/path: "/metrics"
+  name: network-monitor-${1//./-}
+spec:
+  selector:
+    app: network-monitor
+    node: $1
+  ports:
+  - name: http
+    port: 4568
+EOF
+}
+
+main "$@"

indicator/Containerfile.serve

@@ -3,5 +3,6 @@ RUN mkdir -p /usr/src/app
 COPY Gemfile Gemfile.lock indicator_app.rb /usr/src/app
 WORKDIR /usr/src/app
 RUN bundle config set --local without development && bundle install
+ENV RACK_ENV=production
 EXPOSE 4567
 CMD ["bundle", "exec", "ruby", "indicator_app.rb"]

monitor/Containerfile.serve

@@ -5,5 +5,6 @@ COPY lib /usr/src/app/lib
 WORKDIR /usr/src/app
 RUN bundle config set --local without development && bundle install
 ENV INDICATORS=http://indicator-a:1234,http://indicator-b:5678
+ENV RACK_ENV=production
 EXPOSE 4568
 CMD ["bundle", "exec", "ruby", "monitor_app.rb", "-p", "4568"]

monitor/Containerfile.test

@@ -1,6 +1,6 @@
 FROM docker.io/library/ruby:3.1.2
 RUN mkdir -p /usr/src/app
-COPY Gemfile Gemfile.lock /usr/src/app
+COPY Gemfile Gemfile.lock monitor_app.rb /usr/src/app
 COPY lib /usr/src/app/lib
 COPY spec /usr/src/app/spec
 WORKDIR /usr/src/app