我有一个带有附加卷的Scylla数据库的Kubernetes部署。它具有一个副本,其清单类似于以下内容:
apiVersion: apps/v1
kind: Deployment
metadata:
name: scylla
labels:
app: myapp
role: scylla
spec:
replicas: 1
selector:
matchLabels:
app: myapp
role: scylla
template:
metadata:
labels:
app: myapp
role: scylla
spec:
containers:
- name: scylla
image: scylladb/scylla
imagePullPolicy: Always
volumeMounts:
- mountPath: /var/lib/scylla/data
name: scylladb
volumes:
- name: scylladb
hostPath:
path: /var/myapp/scylla/
type: DirectoryOrCreate
当我执行更新时,它将终止旧的pod并在旧的pod停止之前启动新的pod。这将导致新Pod上的数据库失败,因为它无法访问卷中存储的数据库文件(因为旧Pod仍在使用它)。我如何才能做到一次只有一个吊舱使用该卷? (短暂的停机时间还可以)
答案 0 :(得分:3)
您可以在部署中使用重新创建策略来执行此操作。在创建新的Pod之前,这将杀死所有现有Pod。参考:Kubernetes doc。因此,这将导致一些停机时间。
apiVersion: apps/v1
kind: Deployment
metadata:
name: scylla
labels:
app: myapp
role: scylla
spec:
replicas: 1
selector:
matchLabels:
app: myapp
role: scylla
strategy:
type: Recreate
template:
metadata:
labels:
app: myapp
role: scylla
spec:
containers:
- name: scylla
image: scylladb/scylla
imagePullPolicy: Always
volumeMounts:
- mountPath: /var/lib/scylla/data
name: scylladb
volumes:
- name: scylladb
hostPath:
path: /var/myapp/scylla/
type: DirectoryOrCreate