examples

ktempl examples

Example config

interval: 30s
permissions: 0640

template: examples/example.tpl

selector:
  app: coolweb
  environment: production

log:
  file: ktempl.log

values:
  title: Example
  port: 32835

Couple template examples

Simple example

Create template file for example example.tpl, with such contents:

# >>>> start of the template {{ .Values.title }} <<<<
{{- range $i, $n := .Nodes }}
Node {{$n.Name }} has {{ $n.InternalIP }} IP and port {{ $.Values.port }}
{{- end }}

Execute ktempl:

# selects pods by app=myapp1 and get's nodes they are running on. outputs to stdout.
ktempl -p -l app=myapp1 -t example.tpl --set title=Hello,port=32456

Varnish

Create template varnish.tpl with contents listed in varnish example template:

import directors;
{{ range $i, $n := .Nodes }}
backend {{$n.Name}} {
    .host = "{{$n.InternalIP}}";
    .port = "{{ $.Values.port }}";
}{{end}}

sub vcl_init {
  new bar = directors.round_robin();
{{range $i, $n := .Nodes}}
  bar.add_backend({{$n.Name}});{{end}}
}

sub vcl_recv {
  set req.backend_hint = bar.backend();
}

# selects nodes using app=stagingapps label
ktempl -l app=stagingapps -t varnish.tpl  -o backend.conf --set port=32456 --exec="systemctl reload varnishd"