01_etcd_scaleup.md

Appendix 2: etcd Scaleup

This appendix is going to show you how to do a scaleup of etcd hosts.

Adapt Inventory

Uncomment the new etcd hosts in the Ansible inventory in the ([new_etcd]) section.

...
[etcd]
master0.user[X].lab.openshift.ch

[new_etcd]
master1.user[X].lab.openshift.ch
master2.user[X].lab.openshift.ch
...

Scaleup

Execute the playbook responsible for the etcd scaleup:

ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-etcd/scaleup.yml

Verification and Finalization

Verify your installation now consists of the original cluster plus one new etcd member:

sudo etcdctl -C https://master0.user[X].lab.openshift.ch:2379 --ca-file=/etc/origin/master/master.etcd-ca.crt --cert-file=/etc/origin/master/master.etcd-client.crt --key-file=/etc/origin/master/master.etcd-client.key cluster-health

Move the now functional etcd members from the group [new_etcd] to [etcd] in your Ansible inventory at /etc/ansible/hosts so the group looks like:

...
[etcd]
master0.user[X].lab.openshift.ch
master1.user[X].lab.openshift.ch
master2.user[X].lab.openshift.ch

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