K8s+docker: Deploy message Board Php+redis

Preparation before you begin

dhcpdns.lab.example.com 192.168.0.5  dhcp+dns+ntpserverc.lab.example.com 192.168.0.30 as a master serverservera.lab.example.com 192.168.0.10 serverb.lab.example.com 192.168.0.20

disabling firewalls

servera and serverb and serverc disable firewalld

Configure NTP three servers to install Docker kubernetes

[Email protected]]# yum-y Install Docker

[[Email protected]]# systemctl Enable Docker && Systemctl start Docker

Configure Ali Agent

Vim/etc/docker/daemon.json

    {        "registry-mirrors": ["https://0i5z79j3.mirror.aliyuncs.com"]    }

Systemctl daemon-reload && systemctl Restart Docker

[Email protected] ~]# Vi/etc/yum.repos.d/virt7-testing.repo

[virt7-testing]name=virt7-testingbaseurl=http://cbs.centos.org/repos/virt7-docker-el-testing/x86_64/os/gpgcheck=0

[Email protected]]# yum-y Install--enablerepo=virt7-testing kubernetes

Installing the Kubenetes database package

[Email protected]]# yum-y Install http://cbs.centos.org/kojifiles/packages/etcd/0.4.6/7.el7.centos/x86_64/ etcd-0.4.6-7.el7.centos.x86_64.rpm

This is configured on each node

[[Email protected]]# vi/etc/kubernetes/config

KUBE_MASTER="--master=http://serverc.lab.example.com:8080"KUBE_ETCD_SERVERS="--etcd_servers=http://serverc.lab.example.com:4001"

Configuration on ServerC (master) host

[Email protected] yum.repos.d]# Vi/etc/kubernetes/apiserver

KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"KUBE_API_PORT="--port=8080"# KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"

Restart Service Etcd kube-apiserver Kube-controller-manager Kube-scheduler

[Email protected] yum.repos.d]# ps-efw|grep kube

Modify the configuration on ServerA (node)

[Email protected] ~]# Vi/etc/kubernetes/kubelet

KUBELET_ADDRESS="--address=0.0.0.0"KUBELET_PORT="--port=10250"KUBELET_HOSTNAME="--hostname-override=servera.lab.example.com"KUBELET_API_SERVER="--api_servers=http://serverc.lab.example.com:8080"

Restart Service Docker Kubelet Kube-proxy Error Resolution

No API token found for service account ' default ', retry after the token was automatically created and added to the service Account
The solution is to remove the Certified editor/etc/kubernetes/apiserver remove the Securitycontextdeny,serviceaccount in Kube_admission_control
Restart Kube-apiserver.service Service

[Email protected] ymal-pod]# systemctl restart Kube-apiserver.service

[[email protected] pod-yaml]# Kubectl get nodes

Create a database to create a Redis pod

apiVersion: v1kind: ReplicationControllermetadata:    name: redis-master    labels:        name: redis-masterspec:    replicas: 1    selector:        name: redis-master    template:        metadata:            labels:                name: redis-master        spec:            containers:            - name: master                image: kubeguide/redis-master                ports:                - containerPort: 6379

Create a service for Redis

[Email protected] pod-yaml]# VI Redis-master.yaml

    apiVersion: v1    kind: Service    metadata:        name: redis-master        labels:        name: redis-master    spec:        ports:        - port: 6379        targetPort: 6379        selector:        name: redis-master

Troubleshooting:

[[email protected] ymal-pod]# kubectl describe pod redis-master-jr638需要在节点(node)上安装[[email protected] ymal-pod]# docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest[[email protected] ymal-pod]# yum install *rhsm*

[Email protected] ymal-pod]# VI Redis-service.yaml

apiVersion: v1kind: Servicemetadata:    name: redis-master    labels:        name: redis-masterspec:    ports:    - port: 6379        targetPort: 6379    selector:        name: redis-master

[Email protected] ymal-pod]# Kubectl create-f Redis-service.yaml

[[email protected] ymal-pod]# Kubectl get pods-o Wide

Create from Database

[Email protected] ymal-pod]# VI Redis-slave.yaml

apiVersion: v1kind: ReplicationControllermetadata:    name: redis-slave    labels:        name: redis-slavespec:    replicas: 2    selector:        name: redis-slave    template:        metadata:            labels:                name: redis-slave        spec:            containers:            - name: slave                image: kubeguide/guestbook-redis-slave                env:                - name: GET_HOSTS_FROM                    value: env                ports:                - containerPort: 6379

[Email protected] ymal-pod]# VI Redis-slave-service.yaml

apiVersion: v1kind: Servicemetadata:    name: redis-slave    labels:        name: redis-slavespec:    ports:    - port: 6379    selector:        name: redis-slave

To realize the master-slave data synchronization of Redis cluster, redis-slave need to know the address of redis-master, so in Redis-slave image's boot command/run.sh, you can see the following content:
Redis-server--slaveof ${redis_master_service_host} 6379

Creating a front-end pod

[Email protected] ymal-pod]# VI Frontend-pod.yaml

apiVersion: v1kind: ReplicationControllermetadata:    name: frontend    labels:        name: frontendspec:    replicas: 3    selector:        name: frontend    template:        metadata:            labels:                name: frontend        spec:            containers:            - name: frontend                image: kubeguide/guestbook-php-frontend                env:                - name: GET_HOSTS_FROM                    value: env                ports:                - containerPort: 80

Create a front-end service

[Email protected] ymal-pod]# VI Frontend-service.yaml

Version: v1kind: Servicemetadata:    name: frontend    labels:        name: frontendspec:    type: NodePort    ports:    - port: 80        nodePort: 30001    selector:        name: frontend

[Email protected] pod-yaml]# Kubectl create-f Frontend-service.yaml

[[email protected] ymal-pod]# Kubectl get pod-o Wide

NAME                 READY     STATUS    RESTARTS   AGE       IP           NODEfrontend-22b67       1/1       Running   0          4m        172.17.0.3   servera.lab.example.comfrontend-lksvk       1/1       Running   0          4m        172.17.0.4   serverb.lab.example.comfrontend-v81wh       1/1       Running   0          4m        172.17.0.4   servera.lab.example.comredis-master-xbkwj   1/1       Running   0          51m       172.17.0.2   serverb.lab.example.comredis-slave-cqj43    1/1       Running   0          32m       172.17.0.2   servera.lab.example.comredis-slave-q1q4j    1/1       Running   0          32m       172.17.0.3   serverb.lab.example.com

[[email protected] ymal-pod]# Kubectl Get Service

NAME           CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGEfrontend       10.254.127.111   <nodes>       80:30001/TCP   21skubernetes     10.254.0.1       <none>        443/TCP        1hredis-master   10.254.20.7      <none>        6379/TCP       42mredis-slave    10.254.156.197   <none>        6379/TCP       29m

firefox:http://serverb.lab.example.com:30001/

K8s+docker: Deploy message Board Php+redis