CrateDB does not select a leader

CrateDB
1

Hi,

I am trying to run Crate on my Kubernetes Cluster, followed the example yaml’s from Crate but Crate fails to select a leader.

My cluster:

6 raspberry pi’s running Ubuntu 23
Microk8s 1.24
Crate 4.6.4

3 crate-pods are created: crate-0 crate-1 and crate-2.
Service running fine, ui available. Shows 1 node.

Log says:

ClusterFormationFailureHelper] [crate] master not discovered yet, this node has not previously joined a bootstrapped (v4+) cluster, and this node must discover master-eligible nodes [crate-0, crate-1, crate-2] to bootstrap a cluster: have discovered [{crate}{n5vvU2U9Ryme7AqUP4umdw}{pA53ho4NQD2SjdVk29JsuQ}{10.1.178.252}{10.1.178.252:4300}{http_address=10.1.178.252:4200}, {crate}{AWYiQib8QjW-0Hy4fAtaNg}{y3awIuFxQk-hKYMI3uqzdQ}{10.1.127.69}{10.1.127.69:4300}{http_address=10.1.127.69:4200}, {crate}{xJoYtXY2Su-1hgXZYAnA7A}{6I3Bs_YQQIyTpAyiJSBW9A}{10.1.224.4}{10.1.224.4:4300}{http_address=10.1.224.4:4200}]; discovery will continue using [127.0.0.1:4301, 127.0.0.1:4302, 127.0.0.1:4303, 127.0.0.1:4304, 127.0.0.1:4305, [::1]:4301, [::1]:4302, [::1]:4303, [::1]:4304, [::1]:4305, 10.152.183.245:4300] from hosts providers and [{crate}{n5vvU2U9Ryme7AqUP4umdw}{pA53ho4NQD2SjdVk29JsuQ}{10.1.178.252}{10.1.178.252:4300}{http_address=10.1.178.252:4200}] from last-known cluster state; node term 0, last-accepted version 0 in term 0

It seems like the nodes are discovered but not recognonized as eligible.

Help appreciated!

Kind regards Allard

2

Hi,
From that output it looks as if you would have set initial_master_nodes to crate-0, crate-1, crate-2 but then set node.name to crate for all nodes? to get crate-0, 1, etc you may want to use POD_NAME
Maybe you could review that and share the YAML you are using if the cluster is still not forming?

3

Hello hernanc,

thanks for your quick response.

I solved the problem by using the examples from the kubernetes-guide.

The problem was caused by outdated examples i found on your site. Maybe a good idea to remove them.

Kind regards!

4

I am glad that worked and thank you for mentioning this.
Could you point us to to which examples in particular you found problematic?

5

How to set up a CrateDB cluster with Kubernetes uses 4.14 wich didnt work for me

Run Your First CrateDB Cluster on Kubernetes, Part One uses 3.13 wich didnt work for me

6

Dear Allard,

Thank you for reporting this. We will add corresponding admonitions to the outdated pages, to refer readers to updated content about the relevant topics.

May I ask which specific documentation resource you used here, in order to fix the situation?

With kind regards,
Andreas.

/cc @mkod, @Walter_Behmann