Rancher-HA always show Clustered=No

bsjaekel · April 13, 2017, 10:21am

Hi! We are trying to get a HA Rancher cluster up and running. I have already set up three nodes and a MariaDB 10.1 Galera cluster, Installation of Rancher succeeds without any problems, i can connect to the Rancher Server and even register hosts. But in the UI under Admin => High Availability it shows all three nodes but the column Clustered always shows No. Why doesn’t it show Yes? Are there any extra steps required for the cluster? What can i do to solve this issue?

We use the latest stable version (1.5.5).

BTW, are there any docs describing the internal mechanics of a rancher cluster?

Thanks for your help!

johnrengelman · April 14, 2017, 3:11pm

You probably need to specify the proper IP address for advertisement on the nodes.

See https://docs.rancher.com/rancher/v1.5/en/installing-rancher/installing-server/#notes-on-the-rancher-server-nodes-in-ha
There are some built-in options to autoconfigure the IP address discovery (like awslocal). You can see them here: https://github.com/rancher/rancher/blob/master/server/bin/entry#L67-L82

bsjaekel · April 16, 2017, 6:38am

Umm, i have always used the local ip address of the host for the Rancher advertise address. Is this wrong? Do i need to specify the virtual load balancer ip there?

prime421 · April 26, 2017, 11:04pm

Did you ever get this working? I have the opposite problem in that I can get the Cluster to equal yes, but I only ever see one server. If it helps, these are the commands I ran:

docker run -d --restart=unless-stopped -p 8080:8080 -p 9345:9345 rancher/server \

–db-host IP of MySQL Server --db-port 3306 --db-user User account --db-pass Password --db-name rancher
–advertise-address IP of host being added to cluster

Like I said, I can get it to show as clustered, but I don’t see the servers. As I am typing this, I am wondering if it is because I have only 2. I will add a third now and see if that helps.

bsjaekel · April 27, 2017, 6:38pm

Nope, never got this working… The cluster works as expected, it shows the cluster membership in the logs too. But the HA still says clustered=No. Haven’t investigated this further as the Rancher cluster works as expected…

BTW, i used the nearly the same commandline args than yours…

zot24 · April 28, 2017, 1:17pm

This is how our cloud-init file looks like it might help.

github.com

moltin/terraform-rancher-ha/blob/master/config/templates/cloud-config.yml.tmpl

#cloud-config
write_files:
- content: |
    #!/bin/bash
    wait-for-docker
    docker run -d --restart=unless-stopped \
      --name=rancher-ha-server \
      -p 8080:8080 -p 9345:9345 \
      rancher/server:${rancher_version} \
      --db-host ${db_host} \
      --db-name ${db_name} \
      --db-port ${db_port} \
      --db-user ${db_user} \
      --db-pass ${db_pass} \
      --advertise-address $(ip route get 8.8.8.8 | awk '{print $NF;exit}')
  path: /etc/rc.local
  permissions: "0500"
  owner: root

We can see the cluster option activate an it works just fine.

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Rancher-HA always show Clustered=No

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