Missing discovery method when trying to create watcher

[Jaykah]

Hello,

I am trying to get Synapse up and running, however, I have encountered the following error:

/usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse/service_watcher.rb:24:in `create': Missing discovery method when trying to create watcher (ArgumentError)
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse.rb:72:in `block in create_service_watchers'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse.rb:71:in `each'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse.rb:71:in `create_service_watchers'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse.rb:18:in `initialize'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/bin/synapse:59:in `new'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/bin/synapse:59:in `<top (required)>'
    from /usr/local/bin/synapse:23:in `load'
    from /usr/local/bin/synapse:23:in `<main>'

My config looks like this:

---
  services: 
    application: 
      default_servers: 
        - 
          name: "default-app"
          host: "111.111.111.111"
          port: 443
      discovery: 
        method: "zookeeper"
        path: "/services/application"
        hosts: 
          - "xhbtr.site.com:2181"
          - "xhbtr2.site.com:2181"
          - "xhbtr3.site.com:2181"
      haproxy: 
        port: 3214
        server_options: "check inter 2s rise 3 fall 2"
        listen: 
          - "mode http"
          - "option httpchk /health"
          - "http-check expect string OK"
    haproxy: 
      reload_command: "sudo service haproxy reload"
      config_file_path: "/etc/haproxy/haproxy.cfg"
      socket_file_path: "/var/haproxy/stats.sock"
      do_writes: true
      do_reloads: true
      do_socket: false
      global: 
        - "daemon"
        - "user haproxy"
        - "group haproxy"
        - "maxconn 4096"
        - "log     127.0.0.1 local0"
        - "log     127.0.0.1 local1 notice"
        - "stats   socket /var/haproxy/stats.sock mode 666 level admin"
      defaults: 
        - "log      global"
        - "option   dontlognull"
        - "maxconn  2000"
        - "retries  3"
        - "timeout  connect 5s"
        - "timeout  client  1m"
        - "timeout  server  1m"
        - "option   redispatch"
        - "balance  leastconn"
      extra_sections: 
        listen stats :3212: 
          - "mode http"
          - "stats enable"
          - "stats uri /"
          - "stats refresh 5s"

What am I missing?

Thanks!

[igor47]

the reason is that your haproxy section is at the same level of indentation as the application section, under services; haproxy should be a top-level key, at the same level as services instead of under it. currently, it looks like you have no haproxy section but two services, one application which a valid discovery method and one haproxy with no valid discovery method.

this took me a long time to spot. the point of YAML was to make writing these kinds of configs easier, but it still doesn't do an amazing job...

[Jaykah]

Thank you, Igor! Looks like this has taken me a step forward.

However, now I get:

/usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse/service_watcher.rb:28:in `create': Invalid discovery method ["zookeeper"] (ArgumentError)
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse.rb:72:in `block in create_service_watchers'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse.rb:71:in `each'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse.rb:71:in `create_service_watchers'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/lib/synapse.rb:18:in `initialize'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/bin/synapse:59:in `new'
    from /usr/local/lib/ruby/gems/2.1.0/gems/synapse-0.10.0/bin/synapse:59:in `<top (required)>'
    from /usr/local/bin/synapse:23:in `load'
    from /usr/local/bin/synapse:23:in `<main>'

I have tried to follow the project documentation, but it seems like it's a bit outdated (with YAML instead of JSON, and apparently the methods). Would be glad to help fix it up once I understand how to make it work.

[igor47]

why is it ["zookeeper"] in square brackets? are you accidentally creating a yaml list?

[Jaykah]

That's the thing, my YAML does not contain any square brackets, nor does it have the hyphen+space that indicates a list in the case of discovery method.

I have tried a number of variations, with no luck.

It currently looks like this:

services:
 application:
  default_servers:
    name: "default-app"
    host: "111.111.111.111"
    port: 443
  discovery:
    method: "zookeeper"
    path: "/services/application"
    hosts:
     - "xhbtr.site.com:2181"
     - "xhbtr2.site.com:2181"
     - "xhbtr3.site.com:2181"
  haproxy:
    port: 3213
    server_options: "check inter 2s rise 3 fall 2"
    listen:
     - "mode http"
     - "option httpchk /health"
     - "http-check expect string OK"
haproxy:
 reload_command: "sudo service haproxy reload"
 config_file_path: "/etc/haproxy/haproxy.cfg"
 socket_file_path: "/var/haproxy/stats.sock"
 do_writes: true
 do_reloads: true
 do_socket: false
 global:
  - "daemon"
  - "user haproxy"
  - "group haproxy"
  - "maxconn 4096"
  - "log     127.0.0.1 local0"
  - "log     127.0.0.1 local1 notice"
  - "stats   socket /var/haproxy/stats.sock mode 666 level admin"
 defaults:
  - "log      global"
  - "option   dontlognull"
  - "maxconn  2000"
  - "retries  3"
  - "timeout  connect 5s"
  - "timeout  client  1m"
  - "timeout  server  1m"
  - "option   redispatch"
  - "balance  leastconn"
 extra_sections:
  listen stats :3212:
   - "mode http"
   - "stats enable"
   - "stats uri /"
   - "stats refresh 5s"

[Jaykah]

Figured it out, had an extra space that I didn't notice.

[Jaykah]

--comment moved to a separate ticket--