2018/07 作者:ihunter 0 次 0
一、环境介绍及准备:
1、物理机操作系统
物理机操作系统采用Centos7.3 64位,细节如下。
[root@localhost ~]# uname -aLinux localhost.localdomain 3.10.0-514.6.1.el7.x86_64 #1 SMP Wed Jan 18 13:06:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux[root@localhost ~]# cat /etc/redhat-release CentOS Linux release 7.3.1611 (Core)
2、主机信息
本文准备了三台机器用于部署k8s的运行环境
设置三台机器的主机名:
Master上执行:
[root@localhost ~]# hostnamectl --static set-hostname k8s-master
Node1上执行:
[root@localhost ~]# hostnamectl --static set-hostname k8s-node-1
Node2上执行:
[root@localhost ~]# hostnamectl --static set-hostname k8s-node-2
在三台机器上设置hosts,均执行如下命令:
echo '10.0.251.148 k8s-master10.0.251.148 etcd10.0.251.148 registry10.0.251.153 k8s-node-110.0.251.155 k8s-node-2' >> /etc/hosts
3、关闭三台机器上的防火墙
systemctl disable firewalld.servicesystemctl stop firewalld.service
二、部署etcd
k8s运行依赖etcd,需要先部署etcd,本文采用yum方式安装:
[root@localhost ~]# yum install etcd -y
yum安装的etcd默认配置文件在/etc/etcd/etcd.conf。编辑配置文件,更改以下带颜色部分信息:
[root@localhost ~]# vi /etc/etcd/etcd.conf# [member]ETCD_NAME=masterETCD_DATA_DIR="/var/lib/etcd/default.etcd"#ETCD_WAL_DIR=""#ETCD_SNAPSHOT_COUNT="10000"#ETCD_HEARTBEAT_INTERVAL="100"#ETCD_ELECTION_TIMEOUT="1000"#ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"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]#ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380"# if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."#ETCD_INITIAL_CLUSTER="default=http://localhost:2380"#ETCD_INITIAL_CLUSTER_STATE="new"#ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"ETCD_ADVERTISE_CLIENT_URLS="http://etcd:2379,http://etcd:4001"#ETCD_DISCOVERY=""#ETCD_DISCOVERY_SRV=""#ETCD_DISCOVERY_FALLBACK="proxy"#ETCD_DISCOVERY_PROXY=""
启动并验证状态
[root@localhost ~]# systemctl start etcd[root@localhost ~]# etcdctl set testdir/testkey0 00[root@localhost ~]# etcdctl get testdir/testkey0 0[root@localhost ~]# etcdctl -C http://etcd:4001 cluster-healthmember 8e9e05c52164694d is healthy: got healthy result from http://0.0.0.0:2379cluster is healthy[root@localhost ~]# etcdctl -C http://etcd:2379 cluster-healthmember 8e9e05c52164694d is healthy: got healthy result from http://0.0.0.0:2379cluster is healthy
扩展:Etcd集群部署参见——http://www.cnblogs.com/zhenyuyaodidiao/p/6237019.html
三、部署master
1、安装Docker
[root@k8s-master ~]# yum install docker
配置Docker配置文件,使其允许从registry中拉取镜像。
[root@k8s-master ~]# vim /etc/sysconfig/docker# /etc/sysconfig/docker# Modify these options if you want to change the way the docker daemon runsOPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'if [ -z "${DOCKER_CERT_PATH}" ]; then DOCKER_CERT_PATH=/etc/dockerfiOPTIONS='--insecure-registry registry:5000'
设置开机自启动并开启服务
[root@k8s-master ~]# chkconfig docker on[root@k8s-master ~]# service docker start
2、安装kubernets
[root@k8s-master ~]# yum install kubernetes
3、配置并启动kubernetes
在kubernetes master上需要运行以下组件:
Kubernets API Server
Kubernets Controller Manager
Kubernets Scheduler
相应的要更改以下几个配置中带颜色部分信息:
3.1 /etc/kubernetes/apiserver
[root@k8s-master ~]# vim /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 clusterKUBE_ETCD_SERVERS="--etcd-servers=http://etcd:2379"# Address range to use for servicesKUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"# default admission control policies#KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"# Add your own!KUBE_API_ARGS=""
3.2 /etc/kubernetes/config
[root@k8s-master ~]# vim /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 journalKUBE_LOGTOSTDERR="--logtostderr=true"# journal message level, 0 is debugKUBE_LOG_LEVEL="--v=0"# Should this cluster be allowed to run privileged docker containersKUBE_ALLOW_PRIV="--allow-privileged=false"# How the controller-manager, scheduler, and proxy find the apiserverKUBE_MASTER="--master=http://k8s-master:8080"
启动服务并设置开机自启动
[root@k8s-master ~]# systemctl enable kube-apiserver.service[root@k8s-master ~]# systemctl start kube-apiserver.service[root@k8s-master ~]# systemctl enable kube-controller-manager.service[root@k8s-master ~]# systemctl start kube-controller-manager.service[root@k8s-master ~]# systemctl enable kube-scheduler.service[root@k8s-master ~]# systemctl start kube-scheduler.service
四、部署node
1、安装docker
参见3.1
2、安装kubernets
参见3.2
3、配置并启动kubernetes
在kubernetes node上需要运行以下组件:
Kubelet
Kubernets Proxy
相应的要更改以下几个配置文中带颜色部分信息:
3.1 /etc/kubernetes/config
[root@K8s-node-1 ~]# vim /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 journalKUBE_LOGTOSTDERR="--logtostderr=true"# journal message level, 0 is debugKUBE_LOG_LEVEL="--v=0"# Should this cluster be allowed to run privileged docker containersKUBE_ALLOW_PRIV="--allow-privileged=false"# How the controller-manager, scheduler, and proxy find the apiserverKUBE_MASTER="--master=http://k8s-master:8080"
3.2 /etc/kubernetes/kubelet
[root@K8s-node-1 ~]# vim /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=0.0.0.0"# The port for the info server to serve on# KUBELET_PORT="--port=10250"# You may leave this blank to use the actual hostnameKUBELET_HOSTNAME="--hostname-override=k8s-node-1"# location of the api-serverKUBELET_API_SERVER="--api-servers=http://k8s-master:8080"# pod infrastructure containerKUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"# Add your own!KUBELET_ARGS=""
启动服务并设置开机自启动
[root@k8s-master ~]# systemctl enable kubelet.service[root@k8s-master ~]# systemctl start kubelet.service[root@k8s-master ~]# systemctl enable kube-proxy.service[root@k8s-master ~]# systemctl start kube-proxy.service
4、查看状态
在master上查看集群中节点及节点状态
[root@k8s-master ~]# kubectl -s http://k8s-master:8080 get nodeNAME STATUS AGEk8s-node-1 Ready 3mk8s-node-2 Ready 16s[root@k8s-master ~]# kubectl get nodesNAME STATUS AGEk8s-node-1 Ready 3mk8s-node-2 Ready 43s
至此,已经搭建了一个kubernetes集群,但目前该集群还不能很好的工作,请继续后续的步骤。
五、创建覆盖网络——Flannel
1、安装Flannel
在master、node上均执行如下命令,进行安装
[root@k8s-master ~]# yum install flannel
版本为0.0.5
2、配置Flannel
master、node上均编辑/etc/sysconfig/flanneld,修改红色部分
[root@k8s-master ~]# vi /etc/sysconfig/flanneld# Flanneld configuration options# etcd url location. Point this to the server where etcd runsFLANNEL_ETCD_ENDPOINTS="http://etcd:2379"# etcd config key. This is the configuration key that flannel queries# For address range assignmentFLANNEL_ETCD_PREFIX="/atomic.io/network"# Any additional options that you want to pass#FLANNEL_OPTIONS=""
3、配置etcd中关于flannel的key
Flannel使用Etcd进行配置,来保证多个Flannel实例之间的配置一致性,所以需要在etcd上进行如下配置:(‘/atomic.io/network/config’这个key与上文/etc/sysconfig/flannel中的配置项FLANNEL_ETCD_PREFIX是相对应的,错误的话启动就会出错)
[root@k8s-master ~]# etcdctl mk /atomic.io/network/config '{ "Network": "10.0.0.0/16" }'{ "Network": "10.0.0.0/16" }
4、启动
启动Flannel之后,需要依次重启docker、kubernete。
在master执行:
systemctl enable flanneld.service systemctl start flanneld.service service docker restartsystemctl restart kube-apiserver.servicesystemctl restart kube-controller-manager.servicesystemctl restart kube-scheduler.service
在node上执行:
systemctl enable flanneld.service systemctl start flanneld.service service docker restartsystemctl restart kubelet.servicesystemctl restart kube-proxy.service
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使用kubeadm在CentOS 7上安装Kubernetes 1.8
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Kubernetes常用命令以及运行结果梳理