Kubernetes+docker+centos7

Source: Internet
Author: User
Tags etcd

The role of Kubernetes and Docker is not introduced here, directly into the subject.

The purpose of this article is to build Docker clusters and use kubernetes to manage them.

In addition to Kubernetes and Docker, the software environment in this paper also uses ETCD and flannel. The ETCD service runs on the master machine and is used with flannel on the Minion machine to make each minion run on the

Docker has different IP segments, and the ultimate goal is to have a Docker Containner running on different minion have one with any other Containner (Docker Containner running on another minion)

The same IP address. If you don't understand, you can search the Internet for ETCD and flannel.

Environment:

CENTOS7 System Machine Three:

192.168.50.130: Used to install Kubernetes Master

192.168.50.131: Used as kubernetes minion (Minion1)

192.168.50.132: Used as kubbernetes minion (Minion2)

One, shut down the system running firewall

If the system has a firewall turned on, follow the steps below to turn off the firewall (all machines)

# systemctl Stop firewalld# systemctl disable FIREWALLD

Second, master installation configuration

1. Install and configure Kubernetes Master (yum mode)

Yum Install Etcd kubernetes

Configure ETCD, edit/etc/etcd/etcd.conf. Make sure that the listed items are configured correctly and are not commented out, as shown in the following configuration

Etcd_name=defaultetcd_data_dir= "/var/lib/etcd/default.etcd" etcd_listen_client_urls= "http://0.0.0.0:2379" ETCD_ Advertise_client_urls= "http://localhost:2379"

Configure Kubernetes, edit/etc/kubernetes/apiserver

kube_api_address= "--address=0.0.0.0" kube_api_port= "--port=8080" kubelet_port= "--kubelet_port=10250" KUBE_ETCD_ servers= "--etcd_servers=http://127.0.0.1:2379" kube_service_addresses= "--service-cluster-ip-range=10.254.0.0/16 "Kube_admission_control="--admission_control=namespacelifecycle,namespaceexists,limitranger, Securitycontextdeny,resourcequota "Kube_api_args=" "

2. Start Etcd, Kube-apiserver, Kube-controller-manager and Kube-scheduler services

 for inch  Do     systemctl Restart $SERVICES    systemctl enable $SERVICES    done

3. ETCD settings (which will be automatically obtained by the flannel running on Minion and used to set the IP address of Docker)

' {"Network": "172.17.0.0/16"} '

Tips:/coreos.com/network/config is just a configuration item name, no need to worry

4. Now that the master configuration is complete, run Kubectl get nodes to see how many Minion are running and their status. Here our minion haven't started to install the configuration, so the result is empty after running

# Kubectl Get nodesname             LABELS              STATUS

Three, Minion installation configuration (each Minion machine is installed according to the following configuration)

1. Installation and configuration of the environment

Yum Install Docker-engine flannel kubernetes

Configure flannel, edit/etc/sysconfig/flanneld

Flannel_etcd= "http://192.168.50.130:2379"

Configure Kubernetes, edit/etc/kubernetes/config

Kube_master= "--master=http://192.168.50.130:8080"

Configure Kubernetes, edit/etc/kubernetes/kubelet (please use each Minion own IP address such as: 192.168.50.131 instead of the following $localip)

kubelet_address= "--address=0.0.0.0" kubelet_port= "--port=10250" # Change the hostname to this host ' s IP addresskubelet_ Hostname= "--hostname_override= $LOCALIP" kubelet_api_server= "--api_servers=http://192.168.50.130:8080" KUBELET_ Args= ""

2. Prepare to start the service (if you have already run Docker on the machine, please look over it, ignore this step)

Run Ifconfig to see the network configuration of the machine (with DOCKER0)

#ifconfigDocker0 Link encap:ethernet HWaddr Geneva: the: B2: the: 2E: theinet Addr:172.17.0.1Bcast:0.0.0.0Mask:255.255.0.0Up Broadcast multicast MTU: theMetric:1RX Packets:0Errors0Dropped0Overruns:0Frame0TX Packets:0Errors0Dropped0Overruns:0Carrier0Collisions:0Txqueuelen:0
RX bytes:0(0.0B) TX Bytes:0(0.0B)

WARNING: You can see DOCKER0 on a machine running Docker, where you need to remove the DOCKER0 configuration before starting the service, and run at the command line: sudo IP link delete docker0

The purpose of this is to restart Docker by flannel assigning address segments to Docker.

3. Start the service

 for inch  Do     systemctl Restart $SERVICES    systemctl enable $SERVICES    done

Tips: Here I come across a strange problem, starting the Kubelet service or the flannel service can be problematic and cannot be started if you encounter a similar problem. You can try uninstalling Kubernetes, reinstalling the configuration

That's what I'm dealing with, re-faking it. ^_^

Iv. Configuration Complete Verification Installation

Determine that two minion (192.168.50.131 and 192.168.50.132) and one master (192.168.50.130) have successfully installed the configuration and that the service has been started.

Switch to master machine, Run command Kubectl get nodes

# Kubectl Get Nodesname             LABELS                                  STATUS192.168. 50.131   kubernetes.io/hostname=192.168. 50.131    Ready192.168. 50.132   kubernetes.io/hostname=192.168. 50.132   Ready

You can see that the two Minion configured are already in the node list of master. If you want more node, just follow the Minion configuration and configure more machines.

A docker cluster managed by Kubernetes has been configured to do so. The following article will write about Kubernetes control minion running Docker container, about kubernetes of pod,replication Controller (RC), some things of service.

Kubernetes+docker+centos7

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