c12s-kubespray/roles/kubernetes/master/tasks/kubeadm-upgrade.yml
Matthew Mosesohn 85c851f519 scale down coredns on each master during graceful upgrade (#5344)
This fixes the scenario where masters are upgraded one at a time
and coredns gets improperly scaled back up to 2 replicas.

Change-Id: I7cc9283f40efcfd61b5813c89a5805c95d901567
2019-11-18 00:13:41 -08:00

56 lines
1.8 KiB
YAML

---
- name: kubeadm | Upgrade first master
command: >-
timeout -k 600s 600s
{{ bin_dir }}/kubeadm
upgrade apply -y {{ kube_version }}
--config={{ kube_config_dir }}/kubeadm-config.yaml
--ignore-preflight-errors=all
--allow-experimental-upgrades
--allow-release-candidate-upgrades
--etcd-upgrade=false
--force
register: kubeadm_upgrade
# Retry is because upload config sometimes fails
retries: 3
when: inventory_hostname == groups['kube-master']|first
failed_when: kubeadm_upgrade.rc != 0 and "field is immutable" not in kubeadm_upgrade.stderr
notify: Master | restart kubelet
# FIXME: https://github.com/kubernetes/kubeadm/issues/1498 remove stdout_lines
# check after issue is fixed
- name: kubeadm | Upgrade other masters
command: >-
timeout -k 600s 600s
{{ bin_dir }}/kubeadm
upgrade apply -y {{ kube_version }}
--config={{ kube_config_dir }}/kubeadm-config.yaml
--ignore-preflight-errors=all
--allow-experimental-upgrades
--allow-release-candidate-upgrades
--etcd-upgrade=false
--force
register: kubeadm_upgrade
when: inventory_hostname != groups['kube-master']|first
failed_when:
- kubeadm_upgrade.rc != 0
- '"field is immutable" not in kubeadm_upgrade.stderr'
- kubeadm_upgrade.stdout_lines | length > 1
notify: Master | restart kubelet
# FIXME: https://github.com/kubernetes/kubeadm/issues/1318
- name: kubeadm | scale down coredns replicas to 0 if not using coredns dns_mode
command: >-
{{ bin_dir }}/kubectl
--kubeconfig /etc/kubernetes/admin.conf
-n kube-system
scale deployment/coredns --replicas 0
register: scale_down_coredns
retries: 6
delay: 5
until: scale_down_coredns is succeeded
run_once: yes
when:
- kubeadm_scale_down_coredns_enabled
- dns_mode not in ['coredns', 'coredns_dual']
changed_when: false