编写 configmap 的 Shell 脚本

Question

寻找一些关于编写 shell 脚本以生成配置映射以在我的集群中使用的帮助/指导。我想编写一个 shell 脚本来循环遍历值的映射或字典来填写配置映射。

例子：

apiVersion: v1
kind: ConfigMap
metadata:
  annotations:
    meta.helm.sh/release-name: prometheus-adapter
    meta.helm.sh/release-namespace: prometheus
  labels:
    app.kubernetes.io/component: metrics
    app.kubernetes.io/instance: prometheus-adapter
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: prometheus-adapter
    app.kubernetes.io/part-of: prometheus-adapter
    app.kubernetes.io/version: v0.10.0
    helm.sh/chart: prometheus-adapter-3.4.1
  name: prometheus-adapter
  namespace: prometheus
data:
  config.yaml: |
    rules:
      - seriesQuery: 'haproxy_backend_http_requests_total{namespace!="", pod!="", proxy="pod1"}'
        metricsQuery: 'sum(rate(haproxy_backend_http_requests_total{namespace!="", pod!="", proxy="pod1"}[2m])) by (<<.GroupBy>>)'
        resources:
          overrides:
            namespace: {resource: "namespace"}
        name:
          matches: "^(.*)_total$"
          # The metric we want the individual pod to match
          as: "dfs_requests_per_second"

我想编写一个 shell 脚本，添加来自 -seriesQuery 及以下的所有内容，替换存在赋值变量的值，例如 proxy="value" 和 [2m] 度量间隔。 对于每个键/值对，它会添加带有缩进的相同块。有点像这样

吊舱名称：[吊舱 1，吊舱 2] 间隔：[2m，3m]

      - seriesQuery: 'haproxy_backend_http_requests_total{namespace!="", pod!="", proxy="pod1"}'
        metricsQuery: 'sum(rate(haproxy_backend_http_requests_total{namespace!="", pod!="", proxy="pod1"}[2m])) by (<<.GroupBy>>)'
        resources:
          overrides:
            namespace: {resource: "namespace"}
        name:
          matches: "^(.*)_total$"
          # The metric we want the individual pod to match
          as: "dfs_requests_per_second"
          - seriesQuery: 'haproxy_backend_http_requests_total{namespace!="", pod!="", proxy="pod2"}'
        metricsQuery: 'sum(rate(haproxy_backend_http_requests_total{namespace!="", pod!="", proxy="pod2"}[3m])) by (<<.GroupBy>>)'
        resources:
          overrides:
            namespace: {resource: "namespace"}
        name:
          matches: "^(.*)_total$"
          # The metric we want the individual pod to match
          as: "dfs_requests_per_second"

并将其附加到下面的所有内容中

apiVersion: v1
kind: ConfigMap
metadata:
  annotations:
    meta.helm.sh/release-name: prometheus-adapter
    meta.helm.sh/release-namespace: prometheus
  labels:
    app.kubernetes.io/component: metrics
    app.kubernetes.io/instance: prometheus-adapter
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: prometheus-adapter
    app.kubernetes.io/part-of: prometheus-adapter
    app.kubernetes.io/version: v0.10.0
    helm.sh/chart: prometheus-adapter-3.4.1
  name: prometheus-adapter
  namespace: prometheus
data:
  config.yaml: |
    rules:

Answer 1

最好使用支持 YAML 的模板引擎，但前提是您的 pod 名称和间隔不包含任何有问题的字符，您可以使用 bash 轻松生成配置文件：

#!/bin/bash

pods=( pod1 pod2 )
intervals=( 2m 3m )

cat <<'EOF'
apiVersion: v1
kind: ConfigMap
metadata:
  annotations:
    meta.helm.sh/release-name: prometheus-adapter
    meta.helm.sh/release-namespace: prometheus
  labels:
    app.kubernetes.io/component: metrics
    app.kubernetes.io/instance: prometheus-adapter
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: prometheus-adapter
    app.kubernetes.io/part-of: prometheus-adapter
    app.kubernetes.io/version: v0.10.0
    helm.sh/chart: prometheus-adapter-3.4.1
  name: prometheus-adapter
  namespace: prometheus
data:
  config.yaml: |
    rules:
EOF

for i in "${!pods[@]}"
do
cat <<EOF
      - seriesQuery: 'haproxy_backend_http_requests_total{namespace!="", pod!="", proxy="${pods[i]}"}'
        metricsQuery: 'sum(rate(haproxy_backend_http_requests_total{namespace!="", pod!="", proxy="${pods[i]}"}[${intervals[i]}])) by (<<.GroupBy>>)'
        resources:
          overrides:
            namespace: {resource: "namespace"}
        name:
          matches: "^(.*)_total$"
          # The metric we want the individual pod to match
          as: "dfs_requests_per_second"
EOF
done