How to use kubernetes

This article mainly introduces how to use kubernetes, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

1 main and standby host centos

2 turn off the firewall

Systemctl stop firewalld & & systemctl disable firewalld

3 install etcd and kubernetes

Yum install etcd kubernetes-y

3 modify docker configuration file

Add-- insecure-registry gcr.io after the OPTIONS parameter to the docker configuration file / etc/sysconfig/docker, as follows:

4 modify kubernetes configuration file

Delete the ServiceAccount in parameter KUBE_ADMISSION_CONTROL in the configuration file / etc/kubernetes/apiserver

5 start the kubectl service at once

Systemctl start etcd

Systemctl start docker

Systemctl start kube-apiserver

Systemctl start kube-controller-manager

Systemctl start kube-scheduler

Systemctl start kubelet

Systemctl start kube-proxy

6 download the image required for the case

Docker pull docker.io/kubeguide/redis-master

Dokcer pull docker.io/kubeguide/guestbook-redis-slave

Docker pull docker.io/kubeguide/guestbook-php-frontend

Docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest

When pulling the image registry.access.redhat.com/rhel7/pod-infrastructure:latest, an error may be reported and cannot be pulled down. Solution:

Yum install-y * rhsm*

Wget http://mirror.centos.org/centos/7/os/x86_64/Packages/python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm

Rpm2cpio python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm | cpio-iv-- to-stdout. / etc/rhsm/ca/redhat-uep.pem | tee / etc/rhsm/ca/redhat-uep.pem

Re-pull registry.access.redhat.com/rhel7/pod-infrastructure:latest, this mirror is slow to pull, please wait patiently.

7 create RC and service for redis-master

# write the yaml file of rc [root@node1 redis] # cat redis-master-controller.yaml apiVersion: v1kind: ReplicationControllermetadata: name: redis-master / / rc name labels: name: redis-master / / rc tag spec: replicas: 1 / / rc create the number of copies of pod selector: name: redis-master / / tag selector used by rc template: / / use templates to create tags used by pod created by pod metadata: labels: name: redis-master / / This must be consistent with the above rc tag selector spec: containers:-name: master image: kubeguide/redis-master ports:-containerPort: 637creating rckubectl create-f. / redis-master-controller.yaml [root@node1 redis] # kubectl get rc | grep masterredis-master 11 15h [root@node1 redis] # kubectl get pods | grep masterredis-master-k9k5n 1 / 1 Running 0 5h# write the yaml file of service [root@node1 redis] # cat redis-master-service.yaml apiVersion: v1kind: Servicemetadata: redis-master labels: name: redis-masterspec: ports:-port: 6379 # service Virtual Port targetPort: 6379 # pod managed by service selector: name: Redis-master # the tag selector here should be the same as the tag that created pod in the above RC file # create servicekubectl create-f. / redis-master-service.yaml [root@node1 redis] # kubectl get services | grep masterredis-master 10.254.38.172 6379/TCP 2h

8 create RC and service for redis-slave

[root@node1 redis] # cat redis-slave-controller.yaml apiVersion: v1kind: ReplicationControllermetadata: name: redis-slave labels: name: redis-slavespec: replicas: 2 selector: name: redis-slave template: metadata: labels: name: redis-slavespec: containers:-name: slave image: kubeguide/guestbook-redis-slave env:-name: GET_HOSTS_FROM value: Env ports:-containerPort: 6379 [root@node1 redis] # kubectl get pods | grep slaveredis-slave-dt0vk 1 kubectl get pods 1 Running 0 2hredis-slave-lf79v 1 Running 02 h [root@node1 redis] # cat redis-slave-service.yaml apiVersion: v1kind: Servicemetadata: name: redis-slave labels: name: redis-slavespec: ports:-port: 6379 targetPort: 6379 selector: name: redis- Slave [root@node1 redis] # kubectl get services | grep slaveredis-slave 10.254.194.253 6379/TCP 2h

9 create RC and service for frontend

[root@node1 redis] # cat frontend-controller.yaml apiVersion: v1kind: ReplicationControllermetadata: name: frontend labels: name: frontendspec: replicas: 3 selector: name: frontend template: metadata: labels: name: frontendspec: containers:-name: frontend image: kubeguide/guestbook-php-frontend env:-name: GET_HOSTS_FROM value: env ports: -containerPort: 80 [root@node1 redis] # cat frontend-service.yaml apiVersion: v1kind: Servicemetadata: frontend labels: name: frontendspec: type: NodePort ports:-port: 80 nodePort: 30001 selector: name: frontend# because frontend services require external access Therefore, the virtual port of service needs to be mapped to the host, so the nodePort port is added. The range of # nodePort is 30000 to 32767, otherwise an error will be reported. [root@node1 redis] # kubectl get pods | grep frontfrontend-069sm 1 Running 0 2hfrontend-bksm5 1 Running 0 2hfrontend-q2vpv 1 kubectl get rc 1 Running 0 h [root@node1 redis] # kubectl get rc | grep frontfrontend 3 3 32 h [root@node1 redis] # kubectl get service | grep frontfrontend 10.254.27.214 80:30001/TCP 2h

9 experiment

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