我在一个由Postgres数据库和tomcat服务器组成的开源系统上工作。我每个组件都有docker映像。我们目前使用docker-compose测试应用程序。
我正在尝试使用kubernetes对该应用程序进行建模。
这是我的第一次尝试。
apiVersion: v1
kind: Pod
metadata:
name: dspace-pod
spec:
volumes:
- name: "pgdata-vol"
emptyDir: {}
- name: "assetstore"
emptyDir: {}
- name: my-local-config-map
configMap:
name: local-config-map
containers:
- image: dspace/dspace:dspace-6_x
name: dspace
ports:
- containerPort: 8080
name: http
protocol: TCP
volumeMounts:
- mountPath: "/dspace/assetstore"
name: "assetstore"
- mountPath: "/dspace/config/local.cfg"
name: "my-local-config-map"
subPath: local.cfg
#
- image: dspace/dspace-postgres-pgcrypto
name: dspacedb
ports:
- containerPort: 5432
name: http
protocol: TCP
volumeMounts:
- mountPath: "/pgdata"
name: "pgdata-vol"
env:
- name: PGDATA
value: /pgdata
我有一个configMap，它将主机名设置为Pod的名称。
apiVersion: v1
kind: ConfigMap
metadata:
creationTimestamp: 2016-02-18T19:14:38Z
name: local-config-map
namespace: default
data:
local.cfg: |-
dspace.dir = /dspace
db.url = jdbc:postgresql://dspace-pod:5432/dspace
dspace.hostname = dspace-pod
dspace.baseUrl = http://dspace-pod:8080
solr.server=http://dspace-pod:8080/solr
此应用程序具有许多从命令行运行的任务。
我创建了第三个Docker映像，其中包含命令行上所需的jar。
我对在Kubernetes中将这些命令行任务建模为 Jobs 感兴趣。假设这是处理这些任务的适当方法，我如何指定作业应在已经运行的Pod中运行？
这是我第一次定义工作。
apiVersion: batch/v1
kind: Job
#https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion/
metadata:
name: dspace-create-admin
spec:
template:
spec:
volumes:
- name: "assetstore"
emptyDir: {}
- name: my-local-config-map
configMap:
name: local-config-map
containers:
- name: dspace-cli
image: dspace/dspace-cli:dspace-6_x
command: [
"/dspace/bin/dspace",
"create-administrator",
"-e", "test@test.edu",
"-f", "test",
"-l", "admin",
"-p", "admin",
"-c", "en"
]
volumeMounts:
- mountPath: "/dspace/assetstore"
name: "assetstore"
- mountPath: "/dspace/config/local.cfg"
name: "my-local-config-map"
subPath: local.cfg
restartPolicy: Never
答案 0 :(得分：2)
以下配置使我能够按期望的方式启动服务（tomcat和postgres）。
apiVersion: v1
kind: ConfigMap
metadata:
creationTimestamp: 2016-02-18T19:14:38Z
name: local-config-map
namespace: default
data:
# example of a simple property defined using --from-literal
#example.property.1: hello
#example.property.2: world
# example of a complex property defined using --from-file
local.cfg: |-
dspace.dir = /dspace
db.url = jdbc:postgresql://dspacedb-service:5432/dspace
dspace.hostname = dspace-service
dspace.baseUrl = http://dspace-service:8080
solr.server=http://dspace-service:8080/solr
---
apiVersion: v1
kind: Service
metadata:
name: dspacedb-service
labels:
app: dspacedb-app
spec:
type: NodePort
selector:
app: dspacedb-app
ports:
- protocol: TCP
port: 5432
# targetPort: 5432
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: dspacedb-deploy
labels:
app: dspacedb-app
spec:
selector:
matchLabels:
app: dspacedb-app
template:
metadata:
labels:
app: dspacedb-app
spec:
volumes:
- name: "pgdata-vol"
emptyDir: {}
containers:
- image: dspace/dspace-postgres-pgcrypto
name: dspacedb
ports:
- containerPort: 5432
name: http
protocol: TCP
volumeMounts:
- mountPath: "/pgdata"
name: "pgdata-vol"
env:
- name: PGDATA
value: /pgdata
---
apiVersion: v1
kind: Service
metadata:
name: dspace-service
labels:
app: dspace-app
spec:
type: NodePort
selector:
app: dspace-app
ports:
- protocol: TCP
port: 8080
targetPort: 8080
name: http
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: dspace-deploy
labels:
app: dspace-app
spec:
selector:
matchLabels:
app: dspace-app
template:
metadata:
labels:
app: dspace-app
spec:
volumes:
- name: "assetstore"
emptyDir: {}
- name: my-local-config-map
configMap:
name: local-config-map
containers:
- image: dspace/dspace:dspace-6_x-jdk8-test
name: dspace
ports:
- containerPort: 8080
name: http
protocol: TCP
volumeMounts:
- mountPath: "/dspace/assetstore"
name: "assetstore"
- mountPath: "/dspace/config/local.cfg"
name: "my-local-config-map"
subPath: local.cfg
应用上面的配置后，我得到以下结果。
$ kubectl get services -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
dspace-service NodePort 10.104.224.245 <none> 8080:32459/TCP 3s app=dspace-app
dspacedb-service NodePort 10.96.212.9 <none> 5432:30947/TCP 3s app=dspacedb-app
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22h <none>
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
dspace-deploy-c59b77bb8-mr47k 1/1 Running 0 10m
dspacedb-deploy-58dd85f5b9-6v2lf 1/1 Running 0 10
我很高兴看到该服务名称可用于端口转发。
$ kubectl port-forward service/dspace-service 8080:8080
Forwarding from 127.0.0.1:8080 -> 8080
Forwarding from [::1]:8080 -> 8080
我还能够使用configMap中定义的服务名称来运行以下作业。
apiVersion: batch/v1
kind: Job
metadata:
name: dspace-create-admin
spec:
template:
spec:
volumes:
- name: "assetstore"
emptyDir: {}
- name: my-local-config-map
configMap:
name: local-config-map
containers:
- name: dspace-cli
image: dspace/dspace-cli:dspace-6_x
command: [
"/dspace/bin/dspace",
"create-administrator",
"-e", "test@test.edu",
"-f", "test",
"-l", "admin",
"-p", "admin",
"-c", "en"
]
volumeMounts:
- mountPath: "/dspace/assetstore"
name: "assetstore"
- mountPath: "/dspace/config/local.cfg"
name: "my-local-config-map"
subPath: local.cfg
restartPolicy: Never
结果
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
dspace-create-admin-kl6wd 0/1 Completed 0 5m
dspace-deploy-c59b77bb8-mr47k 1/1 Running 0 10m
dspacedb-deploy-58dd85f5b9-6v2lf 1/1 Running 0 10m
我还有一些工作要做以保留卷。