Bootstrapping a new cluster failed with ES7.0

Elastic Stack Elasticsearch
1

I have setdiscovery.seed_hosts and cluster.initial_master_nodes with three master node.
ES outputs this message in log:

[WARN ][o.e.c.c.ClusterFormationFailureHelper] [c3-bigdata-es-master02.bj] master not discovered yet, thisnode has not previously joined a bootstrapped (v7+) cluster, and this node must discover master-eligible nodes [c3-bigdata-es-master01.bj:9301, c3-bigdata-es-master02.bj:9301, c3-bigdata-es-master03.bj:9301] to bootstrap a cluster: have discovered [{c3-bigdata-es-master01.bj}{pzf5WD4KSzeyU1j2nUycVw}{_adKfIIJQ-KuQ-bsllqxuw}{10.136.25.11}{10.136.25.11:9301}{server=c3-bigdata-es-master01.bj, xpack.installed=true}, {c3-bigdata-es-master03.bj}{PTNBlHXwTv-DiRKraJFGww}{GLHvL60-RgWoubD1hVN4rQ}{10.136.145.34}{10.136.145.34:9301}{server=c3-bigdata-es-master03.bj, xpack.installed=true}]; discovery will continue using [10.136.25.11:9301, 10.136.145.34:9301] from hosts providers and [{c3-bigdata-es-master02.bj}{lRjoe29OQKOWYF15DbLzfA}{wC1wWdzRTy--ALoKZPo1Dg}{10.136.186.33}{10.136.186.33:9301}{server=c3-bigdata-es-master02.bj, xpack.installed=true}] from last-known cluster state; node term 0, last-accepted version 0 in term0

Then I set logger level to TRAC , and the log just like this .
I use hostname as node name, It exactly correct.

Finally, I change discovery.seed_hosts and cluster.initial_master_nodes settings to IP not hostname, it worked!

So I wondering why can not bootstrap a cluster using hostname, but IP does?

2

cluster.initial_master_nodes accepts node names, not hostnames, although sometimes a node name will be set to a hostname. See this note in the docs for more information.

3

Yes, I use {HOSTNAME} as node.name. and I use real hostname as node.name not {HOSTNAME}, failed bootstrap either.

4

Right, so your node name is c3-bigdata-es-master02.bj but your cluster.initial_master_nodes is looking for a node called c3-bigdata-es-master02.bj:9301 and they're not the same.

5

Beacuse I add tcp port after hostname, did you mean tcp port should not add to cluster.initial_master_nodes ? or Using hostname can not add tcp port?

6

cluster.initial_master_nodes should be a list of node names. Your node names don't contain ports. Therefore cluster.initial_master_nodes shouldn't contain ports. See again this note in the docs, which starts:

The node names used in the cluster.initial_master_nodes list must exactly match the node.name properties of the nodes.

7

Thanks for helping me to figure out.
I misunderstande that tcp port can add to node name after reading this docs

cluster.initial_master_nodes:
  - 10.0.10.101
  - 10.0.10.102:9300
  - 10.0.10.102:9301

My fault.

8

I see, yes. That only applies if you've got more than one node with the same IP address, but it does only work with IP addresses.