I’m trying to follow the DigitalOcean CoreOS tutorial, however I can’t get past the “Verify Cluster” section of the tutorial. Specifically, when I type in fleetctl list-machines, I receive the following error:

$ fleetctl list-machines
Error retrieving list of active machines: googleapi: Error 503: fleet server unable to communicate with etcd

When I initially created the 3 droplets, I typed this user data verbatim into the web interface to create the droplets:

#cloud-config

coreos:
  etcd2:
    # generate a new token for each unique cluster from https://discovery.etcd.io/new:
    discovery: https://discovery.etcd.io/d8ea4388ae9d4d41818b88f49c8ed80c
    # multi-region deployments, multi-cloud deployments, and Droplets without
    # private networking need to use $public_ipv4:
    advertise-client-urls: http://$private_ipv4:2379,http://$private_ipv4:4001
    initial-advertise-peer-urls: http://$private_ipv4:2380
    # listen on the official ports 2379, 2380 and one legacy port 4001:
    listen-client-urls: http://0.0.0.0:2379,http://0.0.0.0:4001
    listen-peer-urls: http://$private_ipv4:2380
  fleet:
    public-ip: $private_ipv4   # used for fleetctl ssh command
  units:
    - name: etcd2.service
      command: start
    - name: fleet.service
      command: start

It seems to match closely to the tutorial’s configuration. I created 3 droplets on the nyc2 datacenter. The discovery url was generated with the size parameter set to 3.

I’m not sure what the issue is currently, but here are some of the statuses of the relevant services:

$ systemctl status fleet
● fleet.service - fleet daemon
   Loaded: loaded (/usr/lib64/systemd/system/fleet.service; disabled; vendor preset: disabled)
  Drop-In: /run/systemd/system/fleet.service.d
           └─20-cloudinit.conf
   Active: active (running) since Sun 2016-06-05 23:56:54 UTC; 1h 7min ago
 Main PID: 1144 (fleetd)
   Memory: 10.1M
      CPU: 199ms
   CGroup: /system.slice/fleet.service
           └─1144 /usr/bin/fleetd

Jun 05 23:56:54 coreos-512mb-nyc2-01 systemd[1]: Started fleet daemon.
Jun 05 23:56:54 coreos-512mb-nyc2-01 fleetd[1144]: INFO fleetd.go:64: Starting fleetd version 0.11.7
Jun 05 23:56:54 coreos-512mb-nyc2-01 fleetd[1144]: INFO fleetd.go:168: No provided or default config file found - proceeding without
Jun 05 23:56:54 coreos-512mb-nyc2-01 fleetd[1144]: INFO server.go:157: Establishing etcd connectivity

$ systemctl status etcd2
● etcd2.service - etcd2
   Loaded: loaded (/usr/lib64/systemd/system/etcd2.service; disabled; vendor preset: disabled)
  Drop-In: /run/systemd/system/etcd2.service.d
           └─20-cloudinit.conf
   Active: active (running) since Sun 2016-06-05 23:56:54 UTC; 1h 8min ago
 Main PID: 1135 (etcd2)
   Memory: 24.2M
      CPU: 18.091s
   CGroup: /system.slice/etcd2.service
           └─1135 /usr/bin/etcd2

Jun 06 01:05:18 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef is starting a new election at term 3020
Jun 06 01:05:18 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef became candidate at term 3021
Jun 06 01:05:18 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef received vote from 4692ba3abd59cdef at term 3021
Jun 06 01:05:18 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef [logterm: 1, index: 3] sent vote request to afc0c7d0eccba6c at term 3021
Jun 06 01:05:18 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef [logterm: 1, index: 3] sent vote request to d6907df338461404 at term 3021
Jun 06 01:05:19 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef is starting a new election at term 3021
Jun 06 01:05:19 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef became candidate at term 3022
Jun 06 01:05:19 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef received vote from 4692ba3abd59cdef at term 3022
Jun 06 01:05:19 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef [logterm: 1, index: 3] sent vote request to afc0c7d0eccba6c at term 3022
Jun 06 01:05:19 coreos-512mb-nyc2-01 etcd2[1135]: 4692ba3abd59cdef [logterm: 1, index: 3] sent vote request to d6907df338461404 at term 3022

If you couldn’t tell, I’m a bit of a newbie when it comes to CoreOS and it’s configuration. Can anyone give me some guidance as to why these fleet cannot connect to etcd2?