Add task for setting up an autoscaler for a site

infrastructure/Taskfile.yml

@@ -888,6 +888,18 @@ tasks:
       preconditions:
       - *require_site
 
+    site:autoscaler:
+      desc: Runs the a dpladm setup of horizontal autoscaler, making sure the site has an autoscaler configured
+      deps: [cluster:auth]
+      summary: Run the task without additional variables to see required arguments
+      env:
+        SITES_CONFIG: "{{.dir_env}}/sites.yaml"
+        SITE: "{{.SITE}}"
+      cmds:
+        - dpladm/bin/set-up-horizontal-autoscaler.sh
+      preconditions:
+      - *require_site
+
     sites:list-keys:
       desc: List keys for sites in sites.yaml config
       dir: "{{.dir_env}}"

infrastructure/dpladm/autoscaler.template.yaml

@@ -0,0 +1,25 @@
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: php-nginx-autoscaler
+  namespace: ${SITE_NAME}-${SITE_ENV}
+spec:
+  maxReplicas: 5
+  metrics:
+  - resource:
+      name: memory
+      target:
+        averageUtilization: 500
+        type: Utilization
+    type: Resource
+  - resource:
+      name: cpu
+      target:
+        averageUtilization: 70
+        type: Utilization
+    type: Resource
+  minReplicas: 1
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: nginx

infrastructure/dpladm/bin/dpladm-shared.source

@@ -215,3 +215,71 @@ function syncEnvRepo {
   git push origin "${branchName}"
 }
 
+function print_usage {
+    # Start with a more specific error-message if we're passed the name of a
+    # variable that was missing.
+    if [[ -n "${1:-}" ]]; then
+        echo "Could not find the variable ${1}"
+    fi
+    echo
+    echo "Set the following environment variables before running the script."
+    echo "  SITES_CONFIG: path to the sites.yaml that should be used for site configuration"
+    echo "  SITE:         the sites key in sites.yaml"
+    echo ""
+    echo "  FORCE:  Push even if there is no diff in which case an empty"
+    echo "          commit will be pushed."
+
+    exit 1
+}
+
+function getSitePlan {
+    local plan
+    plan=$(yq eval ".sites.${1}.plan" "${2}")
+    if [[ "${plan}" == "null" ]]; then
+        echo "standard"
+        return
+    fi
+
+    echo "${plan}"
+    return
+}
+
+function setUpHorizontalAutoscaler {
+  local siteName=$1
+  local SITES_CONFIG=$2
+  local plan=$(getSitePlan "${siteName}" "${SITES_CONFIG}")
+
+  local workspace
+  workspace="$(getCleanWorkspacePath)"
+  cd "${workspace}"
+
+  renderAutoscalers "${siteName}" "${plan}"
+  kubectl apply --recursive -f autoscalers
+}
+
+function renderAutoscalers {
+  local siteName=$1
+  local plan=$2
+
+  local scriptDir
+  scriptDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+  mkdir autoscalers
+
+  local envs=(
+    "main"
+  )
+
+  if [ plan = "webmaster" ]; then
+    local envs=(
+      "main"
+      "moduletest"
+    )
+  fi
+
+  for env in "${envs[@]}"; do
+    export SITE_NAME="$siteName";
+    export SITE_ENV="$env";
+    envsubst '$SITE_NAME $SITE_ENV' < "${scriptDir}/../autoscaler.template.yaml" > "autoscalers/$env.yaml";
+  done
+}

infrastructure/dpladm/bin/set-up-horizontal-autoscaler.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+#
+# Reads in a sites.yaml and updates the sites environment repository to bring it
+# in sync with the configuration with regards to eg. the deployed release.
+# This will typically trigger a deployment of the site.
+#
+set -euo pipefail
+IFS=$'\n\t'
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+source "${SCRIPT_DIR}/dpladm-shared.source"
+
+if [[ -z "${SITES_CONFIG:-}" ]]; then
+    print_usage "SITES_CONFIG"
+fi
+
+if [[ -z "${SITE:-}" ]]; then
+    print_usage "SITE"
+fi
+
+setUpHorizontalAutoscaler "$SITE" "$SITES_CONFIG"

infrastructure/dpladm/bin/sync-site.sh

@@ -10,23 +10,6 @@ IFS=$'\n\t'
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 source "${SCRIPT_DIR}/dpladm-shared.source"
 
-function print_usage {
-    # Start with a more specific error-message if we're passed the name of a
-    # variable that was missing.
-    if [[ -n "${1:-}" ]]; then
-        echo "Could not find the variable ${1}"
-    fi
-    echo
-    echo "Set the following environment variables before running the script."
-    echo "  SITES_CONFIG: path to the sites.yaml that should be used for site configuration"
-    echo "  SITE:         the sites key in sites.yaml"
-    echo ""
-    echo "  FORCE:  Push even if there is no diff in which case an empty"
-    echo "          commit will be pushed."
-
-    exit 1
-}
-
 function getSiteConfig {
     local config
     config=$(yq eval ".sites.${1}" "${2}")
@@ -77,18 +60,6 @@ function getSiteReleaseImageName {
     return
 }
 
-function getSitePlan {
-    local plan
-    plan=$(yq eval ".sites.${1}.plan" "${2}")
-    if [[ "${plan}" == "null" ]]; then
-        echo "standard"
-        return
-    fi
-
-    echo "${plan}"
-    return
-}
-
 function getSitePrimaryDomain {
     local domain
     domain=$(yq eval ".sites.${1}.primary-domain" "${2}")