Description

When configuring APISIX to bind to IPv6 addresses using [::] in values.yaml, the generated ConfigMap contains unquoted values which causes YAML parsing errors in APISIX.

Environment

• Helm Chart Version: 2.12.4
• Kubernetes Version: 1.34
• Helm Version: 3.18.4 (Through terraform's helm provider)

Steps to Reproduce

1. Set in values.yaml:

   apisix:
     admin:
       ip: "[::]"
       allow:
         ipList:
           - "::/0"

2. Deploy the chart: helm install apisix apisix/apisix -f values.yaml
3. Check APISIX pod logs or ConfigMap
4. Observe YAML parsing error

Expected Behavior

IPv6 addresses should be properly quoted in the generated ConfigMap:

ip: "[::]"
admin:
  allow_admin:
    - "::/0"

Actual Behavior

ConfigMap contains unquoted values that fail YAML parsing:

ip: [::]  # Invalid YAML - interpreted as flow sequence
admin:
  allow_admin:
    - ::/0

Root Cause

The ConfigMap template does not force quotation of IP addresses in listeners or the admin allow list. YAML interprets [ as the start of a flow sequence, making [::] invalid syntax without quotes.

Examples from the template:

ip: {{ .Values.apisix.admin.ip }}

{{- range $ips := .Values.apisix.admin.allow.ipList }}
  - {{ $ips }}
{{- end }}

Current Workaround

Manually add escaped quotes in values.yaml:

apisix:
  admin:
    ip: "\"[::]\""
    allow:
      ipList:
        - "\"::/0\""

Or use the --set-string flag:

helm install apisix apisix/apisix --set-string apisix.admin.ip='[::]'

Proposed Solution

Wrap relevant configmap sections such as IP address template values with quotes:

ip: {{ .Values.apisix.admin.ip | quote }}

{{- range $ips := .Values.apisix.admin.allow.ipList }}
  - {{ $ips | quote }}
{{- end }}

I'm happy to submit a PR for this fix if helpful. This may be combined with my other issue (#921) which also touches the ConfigMap template file.

Note: AI helped format this issue. The issue identification and proposed solutions are my own work.