Shell脚本编写configmap

Question

寻找一些关于编写shell脚本以生成在我的集群中使用的configmap的帮助/指导。我想写一个shell脚本来循环遍历一个映射或值字典来填写一个configmap。

的例子:

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"

我想写一个shell脚本，添加所有从-seriesQuery和以下替换值，如代理="value"2m的度规区间，只要这个赋值变量存在。对于每个键/值对，它将添加带有缩进的相同块。就像这样

pod names: [pod1, pod2]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

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，那么您可以使用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