I'd be grateful if anyone could help point me in the right direction for 
this... Here's the issue:

I've got a 3-node setup sitting behind an F5 as a POC... 

After about 5-10 minutes of all three nodes up and running, I start to see 
occasional "blips" in the web UI and the following entries in the logs of 
all three systems:

2016-05-12T10:25:24.514-07:00 WARN  [ProxiedResource] Node 
<3116ac6b-604f-4436-955c-1458cb489415> not found while trying to call 
org.graylog2.rest.resources.system.jobs.RemoteSystemJobResource on it.
2016-05-12T10:25:27.603-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:25:30.910-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:25:37.556-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:25:40.808-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:25:44.663-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:25:47.922-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:25:57.609-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:00.731-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:04.334-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:07.561-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:10.761-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:26.575-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:30.348-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:33.645-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:37.474-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:40.659-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:43.920-07:00 WARN  [NodePingThread] Did not find meta info 
of this node. Re-registering.
2016-05-12T10:26:50.739-07:00 WARN  [ProxiedResource] Node 
<3116ac6b-604f-4436-955c-1458cb489415> not found while trying to call 
org.graylog2.shared.rest.resources.system.RemoteMetricsResource on it.

I did some googling, and the only thing I'm finding is that it's possible 
the nodes are out of sync time wise.. I checked the system times, and those 
all look correct:

root@gray00 /data]# ntpdate -q ntp0
server 10.201.136.38, stratum 3, offset -0.003738, delay 0.02574
12 May 10:31:40 ntpdate[30786]: adjust time server 10.201.136.38 offset 
-0.003738 sec

[root@gray01 graylog]# ntpdate -q ntp0
server 10.201.136.38, stratum 3, offset -0.000990, delay 0.02576
12 May 10:31:41 ntpdate[28966]: adjust time server 10.201.136.38 offset 
-0.000990 sec

[root@gray02 /data]# ntpdate -q ntp0
server 10.201.136.38, stratum 3, offset 0.001198, delay 0.02582
12 May 10:31:41 ntpdate[30441]: adjust time server 10.201.136.38 offset 
0.001198 sec

Anyone have any ideas?

Here's my setup:

3 nodes: gray00, gray01, gray02 -
each node runs one instance of 
  elastic search, standard ports.
  mongodb, standard ports
  graylog-server - elastic search ports are on 9350.

F5 provides a frontend as "graylog.somewhere.com" ports 12900 & 9000 load 
balanced to each of the 3 nodes. Sticky sessions enabled on both... so what 
am I missing here?

Graylog configuration settings (same for all 3 nodes, just the listen IPs 
are different and gray01/gray02 'is_master = false')

s_master = true
node_id_file = /etc/graylog/server/node-id
password_secret = 
WQBdx6xgWTTykN9LHJhEGxfiSJbeYdaZhHhKEwbvAKQEWkVrl8lgTLvDDkfUtwhe7jgdFDFCBqpmVvY4aea1GyrbQ791UOCv
root_password_sha2 = 
e3ed009797ada49a3fd38a04069b13d5a7f62001a153ed4d9a3da22fa7a75c7b
plugin_dir = /usr/share/graylog-server/plugin
rest_listen_uri = http://10.201.137.208:12900/
rest_transport_uri = http://graylog.somewhere.com:12900/
rest_enable_gzip = true
web_listen_uri = http://10.201.137.208:9000/
web_enable_gzip = true
rotation_strategy = count
elasticsearch_max_docs_per_index = 20000000
elasticsearch_max_number_of_indices = 20
retention_strategy = delete
elasticsearch_shards = 4
elasticsearch_replicas = 1
elasticsearch_index_prefix = graylog
allow_leading_wildcard_searches = false
allow_highlighting = false
elasticsearch_cluster_name = graylog
elasticsearch_node_name_prefix = graylog-
elasticsearch_discovery_zen_ping_unicast_hosts = gray00:9300, gray01:9300, 
gray02:9300, gray00:9350, gray01:9350, gray02:9350
elasticsearch_transport_tcp_port = 9350
elasticsearch_discovery_zen_ping_multicast_enabled = false
elasticsearch_network_host = gray00
elasticsearch_network_bind_host = gray00
elasticsearch_network_publish_host = gray00
elasticsearch_analyzer = standard
output_batch_size = 500
output_flush_interval = 1
output_fault_count_threshold = 5
output_fault_penalty_seconds = 30
processbuffer_processors = 5
outputbuffer_processors = 3
processor_wait_strategy = blocking
ring_size = 65536
inputbuffer_ring_size = 65536
inputbuffer_processors = 2
inputbuffer_wait_strategy = blocking
message_journal_enabled = true
message_journal_dir = /data/graylog/journal
lb_recognition_period_seconds = 3
mongodb_uri = mongodb://gray00:27017,gray01:27017,gray02:2701/graylog
mongodb_max_connections = 1000
mongodb_threads_allowed_to_block_multiplier = 5
transport_email_enabled = true
transport_email_hostname = smtp
transport_email_port =25
transport_email_subject_prefix = [graylog]
transport_email_from_email = [email protected]
transport_email_web_interface_url = https://graylog.somewhere.com
content_packs_dir = /usr/share/graylog-server/contentpacks
content_packs_auto_load = grok-patterns.json

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