haproxy-kubernetes/README_GO.md

Start Go Script to create new Config

export KUBERNETES_HOST="https://10.0.20.7:6443"
export KUBERNETES_TOKEN="eyJhbGciOi..."
export KUBERNETES_VERIFYSSL="false"
export HAPROXY_TEMPLATE="./haproxy.tmpl"

./haproxy-generator > /etc/haproxy/haproxy.cfg && sudo systemctl restart haproxy

HaProxy Template

{{- range .backends }}

backend {{ .Name }}
  mode tcp
  balance leastconn
  cookie {{ .Name }} insert indirect nocache

  {{- range .Servers }}
  server {{ .Name }} {{ .Address }}:{{ .Port }} check cookie {{ .Cookie }}
  {{- end }}

{{- end }}

Systemd Service and Timer

[Unit]
Description=HAProxy Config Generator
After=network.target

[Service]
Type=oneshot
Environment=KUBERNETES_HOST=https://10.0.20.7:6443
Environment=KUBERNETES_TOKEN=eyJhbGciOi...
Environment=KUBERNETES_VERIFYSSL=false
Environment=HAPROXY_TEMPLATE=/etc/haproxy/haproxy.tmpl
ExecStart=/path/to/haproxy-generator > /etc/haproxy/haproxy.cfg
ExecStartPost=/bin/systemctl restart haproxy

Timer for Systemd

[Unit]
Description=Run HAProxy Config Generator every minute

[Timer]
OnBootSec=1min
OnUnitActiveSec=1min
Unit=haproxy-generator.service
Persistent=true

[Install]
WantedBy=timers.target