How to create ConfigMap yaml manifest for Azure Kubernetes using shell or PowerShell script?

Question

I have requirement to create yaml file which can be used to create configmap in kubernetes. I have 3 xml files which are need to be imported in template yaml file.

YAML Template:

apiVersion: v1
data:
  config1.xml: |-
    <Sheet>
    .
    .
    .
    </Sheet>
  config2.xml: |-
    <Sheet>
    .
    .
    .
    
    </Sheet>
  config3.xml: |-
    <Sheet>
    .
    .
    </Sheet>
kind: ConfigMap
metadata:
  name: {{CMPlaceholder}}
  namespace: {{NSPlaceholder}}

xml file:

<Sheet>
    <Category name="Category1">
        <Item name="item1">Cat1Item1.value</Item>
        <Item name="item2">Cat1Item2.value</Item>
    </Category>
    <Category name="Category2">
        <Item name="item1">Cat2Item1.value</Item>
        <Item name="item2">Cat2Item2.value</Item>
    </Category>
    <Category name="Category3">
        <Item name="item1">Cat3Item1.value</Item>
        <Item name="item2">Cat3Item2.value</Item>
    </Category>
    <Category name="Groups">
        <Item name="Group1" commarea="Y">G1.Value</Item>
        <Item name="Group2" commarea="Y">G2.Value</Item>
        <Item name="Group3" commarea="Y">G3.Value</Item>
        <Group1 name="G1.Value">
            <spec name="ISOS">
                <specdetails name="name1">spvalue1</specdetails>
                <specdetails name="name2">spvalue2</specdetails>
                <specdetails name="name3">spvalue3</specdetails>
                <specdetails name="name4">spvalue4</specdetails>
            </spec>
        </Group1>

        .

        .
        <Group2 name="G2.Value"></Group2>

        .

        .
        <Group3 name="G3.Value"></Group3>

        .

        <Category name="FinalProducts">
            <Item name="Product1">Product1FinalValue</Item>
            <Item name="Product2">Product2FinalValue</Item>
            <Item name="Product3">Product3FinalValue</Item>
            <Item name="Product4">Product4FinalValue</Item>
        </Category>
    </Category>
</Sheet>

Similary I have 2 more xml files. I need some script to prepare the final YAML so that I can use it to create configmap in azure kubernetes service using below command

kubectl apply -f "YAMLFILEPATH"

Expecting script to take below arguments.

.\script.sh or .\script.ps1 -YamlTemplate "PathOfYAMLFile" -config1.xml "PathOfConfig1.xml" -config2.xml "PathOfConfig2.xml" -config3.xml "PathOfConfig3.xml" -configMapName "group-product-spec" -namespace "organization" 

Output of the script should be yaml created in the same directory with the name group-product-spec.yaml

Answer 1

Suppose you have three xml files, and you need to create script which can be used to create configmap in kubernetes.

I am showing via bash so let's say I create a create-configmap.sh

#!/bin/bash

# Function to display help message
function display_help() {
    echo "Usage: $0 -YamlTemplate <PathOfYAMLFile> -config1 <PathOfConfig1.xml> -config2 <PathOfConfig2.xml> -config3 <PathOfConfig3.xml> -configMapName <group-product-spec> -namespace <organization>"
    exit 1
}


while [[ $# -gt 0 ]]; do
    case "$1" in
        -YamlTemplate)
            YamlTemplate="$2"
            shift 2
            ;;
        -config1)
            Config1="$2"
            shift 2
            ;;
        -config2)
            Config2="$2"
            shift 2
            ;;
        -config3)
            Config3="$2"
            shift 2
            ;;
        -configMapName)
            ConfigMapName="$2"
            shift 2
            ;;
        -namespace)
            Namespace="$2"
            shift 2
            ;;
        *)
            display_help
            ;;
    esac
done

# Check if all required arguments are provided
if [ -z "$YamlTemplate" ] || [ -z "$Config1" ] || [ -z "$Config2" ] || [ -z "$Config3" ] || [ -z "$ConfigMapName" ] || [ -z "$Namespace" ]; then
    display_help
fi

# Read the content of XML files
Config1Content=$(cat "$Config1")
Config2Content=$(cat "$Config2")
Config3Content=$(cat "$Config3")

# Create the final YAML file by replacing placeholders
OutputYaml="${ConfigMapName}.yaml"
cat <<EOF > "$OutputYaml"
apiVersion: v1
data:
  config1.xml: |-
$(echo "$Config1Content" | sed 's/^/    /')
  config2.xml: |-
$(echo "$Config2Content" | sed 's/^/    /')
  config3.xml: |-
$(echo "$Config3Content" | sed 's/^/    /')
kind: ConfigMap
metadata:
  name: $ConfigMapName
  namespace: $Namespace
EOF

echo "ConfigMap YAML file created at $OutputYaml"

Make the script executable chmod +x create-configmap.sh

Run the script

./create-configmap.sh -YamlTemplate "template.yaml" -config1 "config1.xml" -config2 "config2.xml" -config3 "config3.xml" -configMapName "group-product-spec" -namespace "<whatever_is_your_namespace>"

and finally check using kubectl get configmap group-product-spec

and if you describe it, you can see your xml loaded properly

kubectl describe configmap group-product-spec -n default