本文主要是介绍centOS7.2使用yum安装kubernetes，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
2015年9月1日，CentOS 已经把 Kubernetes 加入官方源，所以现在安装Kubernetes已经方便很多。
master包含kube-apiserver kube-scheduler kube-controller-manager etcd四个组件
node包含kube-proxy kubelet flannel 3个组件
- kube-apiserver:位于master节点,接受用户请求。
- kube-scheduler:位于master节点,负责资源调度,即pod建在哪个node节点。
- kube-controller-manager:位于master节点,包含ReplicationManager,Endpointscontroller,Namespacecontroller,and Nodecontroller等。
- etcd:分布式键值存储系统，共享整个集群的资源对象信息。
- kubelet:位于node节点,负责维护在特定主机上运行的pod。
- kube-proxy:位于node节点,它起的作用是一个服务代理的角色
1.准备工作
在3台服务器上都执行下面的操作。
master：192.168.52.130
node：192.168.52.132
1关闭防火墙
每台机器禁用iptables 避免和docker 的iptables冲突：
#systemctl stop firewalld
#systemctl disable firewalld
#iptables -P FORWARD ACCEPT
2安装NTP
为了让各个服务器的时间保持一致，还需要为所有的服务器安装NTP：
#yum -y install ntp
#systemctl start ntpd
#systemctl enable ntpd
3禁用selinux
#vi /etc/selinux/config
#SELINUX=enforcing
SELINUX=disabled
2.部署master
1.安装etcd和kubernetes(这会自动安装docker)
[root@localhost etc]#yum -y install etcd kubernetes-master
2.修改etcd.conf
[root@localhost etc]# vi /etc/etcd/etcd.conf
ETCD_NAME=node1
#数据存放位置
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
#ETCD_WAL_DIR=""
#ETCD_SNAPSHOT_COUNT="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
#监听其他 Etcd 实例的地址
ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
#监听客户端地址
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""#[cluster]
~ #通知其他 Etcd 实例地址
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.52.130:2380"
#if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
#初始化集群内节点地址
ETCD_INITIAL_CLUSTER="node1=http://192.168.52.130:2380,node2=http://192.168.52.132:2380"
#初始化集群状态，new 表示新建
ETCD_INITIAL_CLUSTER_STATE="new"
#初始化集群 token
ETCD_INITIAL_CLUSTER_TOKEN="mritd-etcd-cluster"
#通知 客户端地址
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.52.130:2379,http://192.168.52.130:4001"
3.修改kube-master配置文件
root@localhost kubernetes]# vi /etc/kubernetes/apiserver
###
#kubernetes system config
#
#The following values are used to configure the kube-apiserver
#
#The address on the local server to listen to.
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
##The port on the local server to listen on.
#KUBE_API_PORT="--port=8080"
#Port minions listen on
KUBELET_PORT="--kubelet-port=10250"
#Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"
#Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16 --service-node-port-range=1-65535"
#default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
#去掉ServiceAccount，解决kubectl get pods时 No resources found.问题
#Add your own!
KUBE_API_ARGS=""
[root@localhost /]# vi /etc/kubernetes/controller-manager
###
#the following values are used to configure the kubernetes controller-manager#defaults from config and apiserver should be adequate
#Add your own!
#KUBE_CONTROLLER_MANAGER_ARGS=""
KUBE_CONTROLLER_MANAGER_ARGS="--node-monitor-grace-period=10s --pod-eviction-timeout=10s"
~
[root@localhost /]# vi /etc/kubernetes/config
###
#kubernetes system config
#
#the following values are used to configure various aspects of all
#kubernetes services, including
#
#kube-apiserver.service
#kube-controller-manager.service
#kube-scheduler.service
#kubelet.service#kube-proxy.service
#logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"#journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"#Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"#How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://192.168.52.130:8080"其中的8080,如果被占用了，或者不想用这个端口，可以修改
4.启动服务
让 etcd kube-apiserver kube-scheduler kube-controller-manager 随开机启动
[root@localhost /]# systemctl enable etcd kube-apiserver kube-scheduler kube-controller-manager
启动
[root@localhost /]# systemctl start etcd kube-apiserver kube-scheduler kube-controller-manager
5.配置etcd中的网络
定义etcd中的网络配置，nodeN中的flannel service会拉取此配置
[root@localhost /]# etcdctl mk /coreos.com/network/config '{"Network":"172.17.0.0/16"}'
3.部署minions（node节点）
1安装kubernetes-node和 flannel(会自动安装docker)
[root@localhost ~]# yum -y install kubernetes-node flannel
2修改kube-node
[root@localhost ~]# vi /etc/kubernetes/config
KUBE_LOGTOSTDERR="--logtostderr=true"#journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"#Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"#How the controller-manager, scheduler, and proxy find the apiserver
#KUBE_MASTER="--master=http://127.0.0.1:8080"
KUBE_MASTER="--master=http://192.168.52.130:8080"hostname改为node自己的ip或名称
[root@localhost ~]# vi /etc/kubernetes/kubelet
###
#kubernetes kubelet (minion) config#The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
KUBELET_ADDRESS="--address=127.0.0.1"#The port for the info server to serve on
#KUBELET_PORT="--port=10250"#You may leave this blank to use the actual hostname
KUBELET_HOSTNAME="--hostname-override=http://192.168.52.132"#location of the api-server
KUBELET_API_SERVER="--api-servers=http://http://192.168.52.130:8080"#pod infrastructure container
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"#Add your own!
#KUBELET_ARGS=""
KUBELET_ARGS="--pod-infra-container-image=kubernetes/pause"
3修改flannel
为etcd服务配置flannel，修改配置文件 /etc/sysconfig/flanneld
[root@localhost ~]# vi /etc/sysconfig/flanneld
#etcd url location. Point this to the server where etcd runs
#FLANNEL_ETCD="http://127.0.0.1:2379"
FLANNEL_ETCD="http://192.168.52.130:2379"#etcd config key. This is the configuration key that flannel queries
#For address range assignment
#FLANNEL_ETCD_KEY="/atomic.io/network"
FLANNEL_ETCD_KEY="/coreos.com/network"#Any additional options that you want to pass
FLANNEL_OPTIONS=" -iface=ens33"FLANNEL_OPTIONS=" -iface=ens33" 其中的ens33是网卡名称（用ifconfig可查询出来,centos7如果你没有改网卡名，那可以是enoXXXXX)
4.启动服务
[root@localhost ~]# systemctl restart flanneld docker
[root@localhost ~]# systemctl start kubelet kube-proxy
[root@localhost ~]# systemctl enable flanneld kubelet kube-proxy
ifconfig下，看到每个minions(node)会有docker0和flannel0这2个网卡。这2个网卡在不同的minons都是不同的.
4.验证
1.Testing Create First Pod
在master上创建docker Nginx Pod
[root@localhost ~]# kubectl create deployment nginx --image=nginx
[root@localhost ~]# kubectl describe deployment nginx
创建服务端口
[root@localhost ~]# kubectl create service nodeport nginx --tcp=80:80[root@localhost ~]# kubectl describe service nginx
Name: nginx
Namespace: default
Labels: app=nginx
Selector: app=nginx
Type: NodePort
IP: 10.254.4.244
Port: 80-80 80/TCP
NodePort: 80-80 30862/TCP
Endpoints: 172.17.48.2:80
Session Affinity: None
No events.2.在node上查看docker nignx容器ip是否对应的 Endpoints
[root@localhost ~]# docker inspect 423a3b8b26b2
[{"Id": "423a3b8b26b2f511ceed97cdc5c5c14e0c4ce69dae5f5818406f0013566da67b""Created": "2019-02-26T01:02:22.4188594Z","Path": "/pause","Args": [],"State": {"Status": "running","Running": true,"Paused": false,"Restarting": false,"OOMKilled": false,"Dead": false,"Pid": 25352,"ExitCode": 0,"Error": "","StartedAt": "2019-02-26T01:02:24.196708758Z","FinishedAt": "0001-01-01T00:00:00Z"},"Image": "sha256:f9d5de0795395db6c50cb1ac82ebed1bd8eb3eefcebb1aa724e0123"ResolvConfPath": "/var/lib/docker/containers/423a3b8b26b2f511ceed97cdc5013566da67b/resolv.conf","HostnamePath": "/var/lib/docker/containers/423a3b8b26b2f511ceed97cdc5c53566da67b/hostname","HostsPath": "/var/lib/docker/containers/423a3b8b26b2f511ceed97cdc5c5c146da67b/hosts","LogPath": "","Name": "/k8s_POD.c73fd98d_nginx-3121059884-4k8vd_default_baed9fe9-38b9-406c","RestartCount": 0,"Driver": "overlay2","MountLabel": "","ProcessLabel": "","AppArmorProfile": "","ExecIDs": null,"HostConfig": {"Binds": null,"ContainerIDFile": "","LogConfig": {"Type": "journald","Config": {}},"NetworkMode": "default","PortBindings": {},"RestartPolicy": {"Name": "","MaximumRetryCount": 0},"AutoRemove": false,"VolumeDriver": "","VolumesFrom": null,"CapAdd": null,"CapDrop": null,"Dns": ["192.168.52.2"],"DnsOptions": null,"DnsSearch": ["localdomain"],"ExtraHosts": null,"GroupAdd": null,"IpcMode": "","Cgroup": "","Links": null,"OomScoreAdj": -998,"PidMode": "","Privileged": false,"PublishAllPorts": false,"ReadonlyRootfs": false,"SecurityOpt": ["seccomp=unconfined"],"UTSMode": "","UsernsMode": "","ShmSize": 67108864,"Runtime": "docker-runc","ConsoleSize": [0,0],"Isolation": "","CpuShares": 2,"Memory": 0,"NanoCpus": 0,"CgroupParent": "","BlkioWeight": 0,"BlkioWeightDevice": null,"BlkioDeviceReadBps": null,"BlkioDeviceWriteBps": null,"BlkioDeviceReadIOps": null,"BlkioDeviceWriteIOps": null,"CpuPeriod": 0,"CpuQuota": 0,"CpuRealtimePeriod": 0,"CpuRealtimeRuntime": 0,"CpusetCpus": "","CpusetMems": "","Devices": [],"DiskQuota": 0,"KernelMemory": 0,"MemoryReservation": 0,"MemorySwap": -1,"MemorySwappiness": -1,"OomKillDisable": false,"PidsLimit": 0,"Ulimits": null,"CpuCount": 0,"CpuPercent": 0,"IOMaximumIOps": 0,"IOMaximumBandwidth": 0},"GraphDriver": {"Name": "overlay2","Data": {"LowerDir": "/var/lib/docker/overlay2/1bf4efe3b1c04a93dc5efcdea2729e3e6f43b-init/diff:/var/lib/docker/overlay2/8b2860fbde3dec06a9b19e127c49cc9ac62c5/diff:/var/lib/docker/overlay2/5558c6c8eb694182c22e68a223223ff03cd64c70c6612ar/lib/docker/overlay2/602d9c3d734dba42cceddf7e88775efed7e477b95894775a7772149cc"MergedDir": "/var/lib/docker/overlay2/1bf4efe3b1c04a93dc5efcdead729e3e6f43b/merged","UpperDir": "/var/lib/docker/overlay2/1bf4efe3b1c04a93dc5efcdea2729e3e6f43b/diff","WorkDir": "/var/lib/docker/overlay2/1bf4efe3b1c04a93dc5efcdea2b29e3e6f43b/work"}},"Mounts": [],"Config": {"Hostname": "nginx-3121059884-4k8vd","Domainname": "","User": "","AttachStdin": false,"AttachStdout": false,"AttachStderr": false,"Tty": false,"OpenStdin": false,"StdinOnce": false,"Env": ["KUBERNETES_SERVICE_PORT=443","NGINX_SERVICE_HOST=10.254.4.244","NGINX_PORT=tcp://10.254.4.244:80","NGINX_PORT_80_TCP_PORT=80","NGINX_PORT_80_TCP_ADDR=10.254.4.244","KUBERNETES_PORT_443_TCP_ADDR=10.254.0.1","NGINX_PORT_80_TCP=tcp://10.254.4.244:80","KUBERNETES_SERVICE_HOST=10.254.0.1","KUBERNETES_SERVICE_PORT_HTTPS=443","NGINX_SERVICE_PORT_80_80=80","NGINX_PORT_80_TCP_PROTO=tcp","KUBERNETES_PORT=tcp://10.254.0.1:443","KUBERNETES_PORT_443_TCP=tcp://10.254.0.1:443","KUBERNETES_PORT_443_TCP_PROTO=tcp","KUBERNETES_PORT_443_TCP_PORT=443","NGINX_SERVICE_PORT=80","HOME=/","PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/b],"Cmd": null,"Image": "kubernetes/pause","Volumes": null,"WorkingDir": "","Entrypoint": ["/pause"],"OnBuild": null,"Labels": {"io.kubernetes.container.hash": "c73fd98d","io.kubernetes.container.name": "POD","io.kubernetes.container.restartCount": "0","io.kubernetes.container.terminationMessagePath": "","io.kubernetes.pod.name": "nginx-3121059884-4k8vd","io.kubernetes.pod.namespace": "default","io.kubernetes.pod.terminationGracePeriod": "30","io.kubernetes.pod.uid": "baed9fe9-38b9-11e9-bd0c-000c291410a9"}},"NetworkSettings": {"Bridge": "","SandboxID": "0fe4522e3b99b460d78ed3fea3beddef34044ce8e339f134998ca4"HairpinMode": false,"LinkLocalIPv6Address": "","LinkLocalIPv6PrefixLen": 0,"Ports": {},"SandboxKey": "/var/run/docker/netns/0fe4522e3b99","SecondaryIPAddresses": null,"SecondaryIPv6Addresses": null,"EndpointID": "e31d625288e553a87e5e7bae1da03badbfeddf83305dc3d43196e"Gateway": "172.17.48.1","GlobalIPv6Address": "","GlobalIPv6PrefixLen": 0,"IPAddress": "172.17.48.2","IPPrefixLen": 24,"IPv6Gateway": "","MacAddress": "02:42:ac:11:30:02","Networks": {"bridge": {"IPAMConfig": null,"Links": null,"Aliases": null,"NetworkID": "901845a1f83d292f893a37bfe735ab0ca022ed0be45817"EndpointID": "e31d625288e553a87e5e7bae1da03badbfeddf83305dc"Gateway": "172.17.48.1","IPAddress": "172.17.48.2","IPPrefixLen": 24,"IPv6Gateway": "","GlobalIPv6Address": "","GlobalIPv6PrefixLen": 0,"MacAddress": "02:42:ac:11:30:02"}}}}
]3.在master上执行
[root@localhost ~]# kubectl get nodes
NAME STATUS AGE
192.168.52.132 Ready 20m
[root@localhost ~]#kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-3121059884-4k8vd 1/1 Running 12 21h
[root@localhost /]kubectl describe pods nginx-3121059884-4k8vd
Name: nginx-3121059884-4k8vd
Namespace: default
Node: 192.168.52.132/192.168.52.132
Start Time: Mon, 25 Feb 2019 12:56:48 +0800
Labels: app=nginxpod-template-hash=3121059884
Status: Running
IP: 172.17.48.2
Controllers: ReplicaSet/nginx-3121059884
Containers:
nginx:Container ID: docker://b1f59f8025255f03c5f7f1a9c5c7847fc9e178d5d4bf5c51b6855db328894a70Image: nginxImage ID: docker-pullable://docker.io/nginx@sha256:dd2d0ac3fff2f007d99e033b64854be0941e19a2ad51f174d9240dda20d9f534Port: State: RunningStarted: Tue, 26 Feb 2019 09:02:30 +0800Last State: TerminatedReason: CompletedExit Code: 0Started: Mon, 25 Feb 2019 17:03:29 +0800Finished: Tue, 26 Feb 2019 09:02:08 +0800Ready: TrueRestart Count: 12Volume Mounts: <none>Environment Variables: <none>
Conditions:
Type Status
Initialized True
Ready True
PodScheduled True
No volumes.
QoS Class: BestEffort
Tolerations: <none>
No events.[root@localhost ~]# kubectl get svc
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.254.0.1 <none> 443/TCP 4d
nginx 10.254.4.244 <nodes> 80:30862/TCP 4d
[root@localhost ~]#kubectl describe svc nginx
Name: nginx
Namespace: default
Labels: app=nginx
Selector: app=nginx
Type: NodePort
IP: 10.254.4.244
Port: 80-80 80/TCP
NodePort: 80-80 30862/TCP
Endpoints: 172.17.48.2:80
Session Affinity: None
No events.4.在node机上测试
[root@localhost ~]#docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b1f59f802525 nginx "nginx -g 'daemon ..." About an hour ago Up About an hour k8s_nginx.9179dbd3_nginx-3121059884-4k8vd_default_baed9fe9-38b9-11e9-bd0c-000c291410a9_e251e27f
423a3b8b26b2 kubernetes/pause "/pause" About an hour ago Up About an hour k8s_POD.c73fd98d_nginx-3121059884-4k8vd_default_baed9fe9-38b9-11e9-bd0c-000c291410a9_bcb3406c查看监听端口
[root@localhost ~]# netstat -lnpt|grep kube-proxy
tcp 0 0 127.0.0.1:10249 0.0.0.0:* LISTEN 25180/kube-proxy
tcp6 0 0 :::30862 :::* LISTEN 25180/kube-proxy [root@localhost ~]#curl http://192.168.52.132:30862/
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>body {width: 35em;margin: 0 auto;font-family: Tahoma, Verdana, Arial, sans-serif;}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p><p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p><p><em>Thank you for using nginx.</em></p>
</body>
</html>2.ie上访问
http://192.168.52.132:30862/
这样etcd+flannel + kubernetes在centOS7上就搭建起来了.
这篇关于centOS7.2使用yum安装kubernetes的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
