https://github.com/jrwren/hapdtabconsul
https://github.com/jrwren/hapdtabconsul
Last synced: 4 months ago
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- Host: GitHub
- URL: https://github.com/jrwren/hapdtabconsul
- Owner: jrwren
- License: mit
- Created: 2022-11-10T20:33:00.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2022-11-14T20:37:04.000Z (over 2 years ago)
- Last Synced: 2023-03-11T01:23:02.638Z (about 2 years ago)
- Language: Go
- Size: 4.88 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# HAPDTABCONSUL
**Proxy DTAB CONSUL
Yes, the name is not creative.
Goal: replace linkerd+namerd with haproxy configuration built from dtab and consul data.
Actual: not tied to haproxy at all, but the examples generate haproxy config.
This could work with any proxy.
This program is a plugin to consul-template so that consul-template is still used to render the haproxy configuration. See https://github.com/hashicorp/consul-template/blob/main/docs/plugins.md
This program expects a dtab to be passed as a string as the first argument and a json encoded list of consul services to be passed as the second argument.
The output of this program is a JSON array ready to be consumed by consul-template.
Very few namerd+dtab finagle expressions are supported;
Only enough for our environment.
```
{{ $dtab := key "namerd/dtabs/default" }}
{{ $h := services | toJSON | plugin "hapdtabconsul" ($dtab) | parseJSON}}
```
## haproxy
A more real example to generate a partial haproxy config:
```
{{ $dtab := key "namerd/dtabs/default" }}
{{ $c := (plugin "hapdtabconsul" ($dtab) (services | toJSON) "https"|parseJSON) }}
{{ range $c.canary_services }}
use_backend public-{{.name}} if { hdr_beg(host) -i {{.name}} }
{{ end }}
# Backends
{{ range $c.canary_services }}
backend public-{{.name}}
option forwardfor
http-request set-header X-Forwarded-Port %[dst_port]
http-request add-header X-Forwarded-Proto https if { ssl_fc }
option httpchk GET /
http-check expect status 401
retry-on conn-failure
retries 1
timeout connect 4000
{{ $canary_weight := .canary_weight -}}
{{- $non_canary_weight := .non_canary_weight -}}
{{- $name := .name -}}
{{- range $i, $s := service .name -}}
{{- if .Tags | contains "canary" }}
server {{.name}}{{$i}} {{$s.Address}}:{{$s.Port}} weight {{$canary_weight}} # canary
{{ end -}}
{{- if .Tags | contains "noncanary" }}
server {{$name}}{{$i}} {{$s.Address}}:{{$s.Port}} weight {{$non_canary_weight}} # noncanary
{{ end -}}
{{- end -}}
{{ end }}
```