Pv-migrate

pv-migrate

https://devopstales.github.io/home/k8s-migrate-pv/

https://github.com/utkuozdemir/pv-migrate

https://github.com/utkuozdemir/pv-migrate/blob/master/USAGE.md

Add

#!/bin/sh
set -eu
curl -LO https://github.com/utkuozdemir/pv-migrate/releases/download/v1.7.1/pv-migrate_v1.7.1_linux_x86_64.tar.gz
tar xf pv-migrate_v1.7.1_linux_x86_64.tar.gz
sudo mv pv-migrate /usr/local/bin/
pv-migrate --version

Backup to ceph-rbd

wordpress.tmp.pvc.yaml

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: data-wordpress-mariadb-0-a
spec:
  accessModes:
  - ReadWriteOnce
  storageClassName: ceph-rbd
  resources:
    requests:
      storage: 8Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: wordpress-a
spec:
  accessModes:
  - ReadWriteOnce
  storageClassName: ceph-rbd
  resources:
    requests:
      storage: 10Gi

kubectl apply -f wordpress.tmp.pvc.yaml

Migrate to temporary backup pvcs

kubectl scale deployment wordpress --replicas=0
kubectl scale statefulset wordpress-mariadb --replicas=0

sleep 5

pv-migrate migrate \
  data-wordpress-mariadb-0 data-wordpress-mariadb-0-a

pv-migrate migrate \
  wordpress wordpress-a

Scale

#!/bin/bash
set -eu
kubectl scale deployment wordpress --replicas=0
kubectl scale statefulset wordpress-mariadb --replicas=0

sleep 5
pv-migrate migrate \
  data-wordpress-mariadb-0-a data-wordpress-mariadb-0

pv-migrate migrate \
  wordpress-a wordpress

kubectl scale deployment wordpress --replicas=1
kubectl scale statefulset wordpress-mariadb --replicas=1

exit

Example helm wordpress

cm.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: php-ini
  labels:
    app.kubernetes.io/name: wordpress
data:
  php-custom.ini: |
    upload_max_filesize = 2256M
    post_max_size = 2256M
    max_execution_time = 360
    max_input_time = 360
    memory_limit = 2512M

main.sh

#!/bin/bash
set -eu

kubectl_apply "-f cm.yaml"
helm upgrade --install wordpress bitnami/wordpress
# if custom values
# envsubst < values.yaml.envsubst > values.yaml
# helm upgrade --install wordpress bitnami/wordpress values.yaml

Run

./main.sh