通過Rancher部署並擴容Kubernetes集群基礎篇二
阿新 • • 發佈：2017-07-13
rancher k8s
接上一篇通過Rancher部署並擴容Kubernetes集群基礎篇一
7. 使用ConfigMap配置redis
https://github.com/kubernetes/kubernetes.github.io/blob/master/docs/user-guide/configmap/redis/redis-config
redis-config
maxmemory 2mb maxmemory-policy allkeys-lru
# kubectl create configmap example-redis-config --from-file=./redis-config
# kubectl get configmap example-redis-config -o yaml
apiVersion: v1
data:
redis-config: |
maxmemory 2mb
maxmemory-policy allkeys-lru
kind: ConfigMap
metadata:
creationTimestamp: 2017-07-12T13:27:56Z
name: example-redis-config
namespace: default
resourceVersion: "45707"
selfLink: /api/v1/namespaces/default/configmaps/example-redis-config
uid: eab522fd-6705-11e7-94da-02672b869d7fredis-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: redis
spec:
containers:
- name: redis
image: kubernetes/redis:v1
env:
- name: MASTER
value: "true"
ports:
- containerPort: 6379
resources:
limits:
cpu: "0.1"
volumeMounts:
- mountPath: /redis-master-data
name: data
- mountPath: /redis-master
name: config
volumes:
- name: data
emptyDir: {}
- name: config
configMap:
name: example-redis-config
items:
- key: redis-config
path: redis.conf
# kubectl create -f redis-pod.yaml pod "redis" created
# kubectl exec -it redis redis-cli 127.0.0.1:6379> 127.0.0.1:6379> 127.0.0.1:6379> config get maxmemory 1) "maxmemory" 2) "2097152" 127.0.0.1:6379> config get maxmemory-policy 1) "maxmemory-policy" 2) "allkeys-lru" 127.0.0.1:6379>
8. 使用kubectl命令管理kubernetes對象
# kubectl run nginx --image nginx deployment "nginx" created
或者
# kubectl create deployment nginx --image nginx
使用kubectl create創建一個配置文件中定義的對象
#kubectl create -f nginx.yaml
刪除兩個配置文件中定義的對象
#kubectl delete -f nginx.yaml -f redis.yaml
更新對象
#kubectl replace -f nginx.yaml
處理configs目錄下所有的對象配置文件，創建新的對象或者打補丁現有的對象
#kubectl apply -f configs/
遞推處理子目錄下的對象配置文件
#kubectl apply -R -f configs/
9. 部署無狀態應用
9.1 使用deployment運行一個無狀態應用
deployment.yaml
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: nginx-deployment
spec:
replicas: 2 # tells deployment to run 2 pods matching the template
template: # create pods using pod definition in this template
metadata:
# unlike pod-nginx.yaml, the name is not included in the meta data as a unique name is
# generated from the deployment name
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
kubectl create -f https://k8s.io/docs/tasks/run-application/deployment.yaml
這裏需要註意一下，rancher1.6.2部署的是kubernetes 1.5.4
這裏的apiVersion要改一下，改成extensions/v1beta1
kubernetes從1.6引入apps/v1beta1.Deployment 替代 extensions/v1beta1.Deployment
顯示這個deployment的信息
# kubectl describe deployment nginx-deployment
10.部署有狀態應用
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通過Rancher部署並擴容Kubernetes集群基礎篇二