srvd

srvd is a configuration management tool using DNS SRV record like confd.

Usage

srvd -config srvd.toml

Usage of ./pkg/srvd:
  -config string
    	Config file path (default "srvd.toml")
  -dryrun
    	Dry run mode
  -nocheck
    	Skip checking
  -nohttpd
    	Stop httpd
  -noreload
    	Skip reloading
  -oneshot
    	Run once
  -version
    	Print version and exit

Configuration example

src = "/etc/haproxy/haproxy.cfg.tmpl"
dest = "/etc/haproxy/haproxy.cfg"
domains = ["_http._tcp.example.com"]
reload_cmd = "/bin/systemctl reload haproxy.service"
check_cmd = "/usr/sbin/haproxy -c -V -f {{ .src }}"
interval = 1
timeout = 3
#resolv_conf = "/etc/resolv.conf"
cooldown = 60
#status_port = 8080
#sdnotify = false
#disable_rollback_on_reload_failure = false
#edns0_size = 4096

Template example

backend nodes
  mode tcp
  {{ $srvs := fetchsrvs .domains "_http._tcp.example.com" }}
  # see https://godoc.org/github.com/miekg/dns#SRV
  {{ range $srvs }}
  server {{ .Target }} {{ .Target }}:{{ .Port }}
  {{ end }}

Check status

$ curl localhost:8080/status
{"LastUpdate":"2018-08-02T23:38:25.647297201+09:00","Ok":true}