Rancher deployment and expansion of Kubernetes cluster Basic chapter II

The next one is to deploy and expand the Kubernetes cluster based on rancher

7. Configuring Redis with Configmap

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 yamlapiversion:v1data:redis-config: | MaxMemory 2mb maxmemory-policy allkeys-lrukind:configmapmetadata:creationtimestamp:2017-07-12t13:27:56z name:exam Ple-redis-config namespace:default resourceversion: "45707" Selflink:/api/v1/namespaces/default/configmaps/ Example-redis-config uid:eab522fd-6705-11e7-94da-02672b869d7f

Redis-pod.yaml

apiversion: v1kind: podmetadata:  name: redisspec:  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-cli127.0.0.1:6379> 127.0.0.1:6379> 127.0.0.1:6379> config get maxmemory1) "Maxmem Ory "2)" 2097152 "127.0.0.1:6379> config get maxmemory-policy1)" Maxmemory-policy "2)" Allkeys-lru "127.0.0.1:6379 >

8. Managing Kubernetes objects with the KUBECTL command

# kubectl Run Nginx--image nginxdeployment "Nginx" created

Or

# kubectl Create deployment Nginx--image Nginx

Creating an object defined in a configuration file using Kubectl Create

#kubectl create-f Nginx.yaml

Delete objects defined in two configuration files

#kubectl delete-f nginx.yaml-f Redis.yaml

　

Updating objects

#kubectl replace-f Nginx.yaml

Process all object profiles under the Configs directory, create new objects or patch existing objects

#kubectl apply-f configs/

Recursive processing of object configuration files under subdirectories

#kubectl Apply-r-F configs/

9. Deploy stateless Apps

9.1 Running a stateless application with deployment

Deployment.yaml

apiversion: apps/v1beta1kind: deploymentmetadata:  name: nginx-deploymentspec:   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

It is important to note that rancher1.6.2 deploys kubernetes 1.5.4

The apiversion here should be changed to extensions/v1beta1 .

Kubernetes introduced apps/v1beta1 from 1.6. Deployment replaces Extensions/v1beta1. Deployment

To display this deployment information

# Kubectl Describe deployment nginx-deployment

10. Deploying Stateful applications

This article is from the Linux SA John blog, so be sure to keep this source http://john88wang.blog.51cto.com/2165294/1946903

Rancher deployment and expansion of Kubernetes cluster Basic chapter II