cron is already configured, can not start scheduler

[xcw0754]

I have 3 nodes:

• vbox1: 192.168.56.103
• vbox2: 192.168.56.104
• vbox3: 192.168.56.105

After bootstrap, vbox3 was become a leader in this cluster. Then I restart vbox3, a new leader vbox1 was elected. When I restart vbox1, leadership was turn back to vbox3. This is the ouput below:

xxx@vbox3:~/dkron$ ./dkron agent --config=config.yml
INFO[2022-05-16T21:18:20+08:00] agent: Dkron agent starting                   node=vbox3
INFO[2022-05-16T21:18:20+08:00] agent: joining: [192.168.56.103 192.168.56.104 192.168.56.105] replay: true  node=vbox3
INFO[2022-05-16T21:18:20+08:00] agent: joined: 3 nodes                        node=vbox3
INFO[2022-05-16T21:18:20+08:00] api: Running HTTP server                      address=":8080" node=vbox3
INFO[2022-05-16T21:18:20+08:00] dkron: monitoring leadership                  node=vbox3
INFO[2022-05-16T21:18:20+08:00] agent: registering usage stats for cluster ID '9xcWVuPZKGLuJx0VJKroc4qphQhm/jUv1FEceqEPWRQ='  node=vbox3
WARN[2022-05-16T21:18:20+08:00] agent: unable to create the usage report client:Post "https://stats.dkron.io/session": dial tcp: lookup stats.dkron.io on 127.0.0.53:53: server misbehaving  node=vbox3
INFO[2022-05-16T21:18:20+08:00] agent: Listen for events                      node=vbox3
INFO[2022-05-16T21:18:21+08:00] agent: Received event                         event=member-join node=vbox3
INFO[2022-05-16T21:18:21+08:00] adding server                                 node=vbox3 server=vbox2
INFO[2022-05-16T21:18:21+08:00] adding server                                 node=vbox3 server=vbox1
INFO[2022-05-16T21:18:21+08:00] agent: Received event                         event=member-update node=vbox3
ERRO[2022-05-16T21:18:23+08:00] no member leader found in member list         node=vbox3
INFO[2022-05-16T21:18:57+08:00] dkron: cluster leadership acquired            node=vbox3
INFO[2022-05-16T21:18:57+08:00] dkron: monitoring leadership                  node=vbox3
INFO[2022-05-16T21:18:57+08:00] agent: Starting scheduler                     node=vbox3
INFO[2022-05-16T21:19:01+08:00] agent: Received event                         event=member-failed node=vbox3
INFO[2022-05-16T21:19:01+08:00] removing server vbox1 (Addr: 192.168.56.103:6868) (DC: dc1)  node=vbox3
INFO[2022-05-16T21:19:01+08:00] agent: Received event                         event=member-update node=vbox3
INFO[2022-05-16T21:19:13+08:00] agent: Received event                         event=member-update node=vbox3
INFO[2022-05-16T21:19:18+08:00] dkron: cluster leadership lost                node=vbox3
INFO[2022-05-16T21:19:18+08:00] dkron: monitoring leadership                  node=vbox3
ERRO[2022-05-16T21:19:19+08:00] no member leader found in member list         node=vbox3
INFO[2022-05-16T21:19:21+08:00] dkron: cluster leadership acquired            node=vbox3
INFO[2022-05-16T21:19:21+08:00] dkron: monitoring leadership                  node=vbox3
INFO[2022-05-16T21:19:21+08:00] agent: Starting scheduler                     node=vbox3
ERRO[2022-05-16T21:19:21+08:00] dkron: failed to establish leadership         error="cron is already configured, can not start scheduler" node=vbox3
INFO[2022-05-16T21:20:21+08:00] agent: Starting scheduler                     node=vbox3
ERRO[2022-05-16T21:20:21+08:00] dkron: failed to establish leadership         error="cron is already configured, can not start scheduler" node=vbox3
INFO[2022-05-16T21:21:21+08:00] agent: Starting scheduler                     node=vbox3
ERRO[2022-05-16T21:21:21+08:00] dkron: failed to establish leadership         error="cron is already configured, can not start scheduler" node=vbox3
INFO[2022-05-16T21:22:21+08:00] agent: Starting scheduler                     node=vbox3
ERRO[2022-05-16T21:22:21+08:00] dkron: failed to establish leadership         error="cron is already configured, can not start scheduler" node=vbox3
INFO[2022-05-16T21:23:21+08:00] agent: Starting scheduler                     node=vbox3
ERRO[2022-05-16T21:23:21+08:00] dkron: failed to establish leadership         error="cron is already configured, can not start scheduler" node=vbox3
INFO[2022-05-16T21:24:21+08:00] agent: Starting scheduler                     node=vbox3
ERRO[2022-05-16T21:24:21+08:00] dkron: failed to establish leadership         error="cron is already configured, can not start scheduler" node=vbox3

version

xxx@vbox1:~/dkron$ ./dkron version
INFO[0000] No valid config found: Applying default values.  error="Config File \"dkron\" Not Found in \"[/etc/dkron /home/xiao/.dkron /home/xiao/dkron/config]\""
Name: Dkron
Version: 3.1.11
Codename: merichuas
Agent Protocol: 5 (Understands back to: 2)

config.yml

server: true
bootstrap-expect: 3
data-dir: dkron.data
log-level: info
join:
  - 192.168.56.103
  - 192.168.56.104
  - 192.168.56.105

[vcastellm]

Fixed in #1119