如何安装k8s集群

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第一步：准备

1. 虚拟机准备

准备三台虚拟机：

2. 初始化虚拟机

在三台虚拟机的hosts文件中均添加配置：

vim /etc/hosts

172.17.142.244 master172.17.142.244 etcd172.17.142.244 registry172.17.142.252 node1172.17.142.246 node2

关闭虚拟机防火墙：

systemctl stop firewalldsystemctl disable firewalld

第二步：部署master节点

master节点需要安装一下组件：

• etcd

• flannel

• docker

• kubernets

1. etcd安装 安装etcd:

yum install etcd -y

修改etcd配置文件：

vim /etc/etcd/etcd.conf

#[Member]#ETCD_CORS=""ETCD_DATA_DIR="/var/lib/etcd/default.etcd"#ETCD_WAL_DIR=""#ETCD_LISTEN_PEER_URLS="http://localhost: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_NAME="master"#ETCD_SNAPSHOT_COUNT="100000"#ETCD_HEARTBEAT_INTERVAL="100"#ETCD_ELECTION_TIMEOUT="1000"#ETCD_QUOTA_BACKEND_BYTES="0"#ETCD_MAX_REQUEST_BYTES="1572864"#ETCD_GRPC_KEEPALIVE_MIN_TIME="5s"#ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s"#ETCD_GRPC_KEEPALIVE_TIMEOUT="20s"##[Clustering]#ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380"ETCD_ADVERTISE_CLIENT_URLS="http://etcd:2379,http://etcd:4001"#ETCD_DISCOVERY=""#ETCD_DISCOVERY_FALLBACK="proxy"#ETCD_DISCOVERY_PROXY=""#ETCD_DISCOVERY_SRV=""#ETCD_INITIAL_CLUSTER="default=http://localhost:2380"#ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"#ETCD_INITIAL_CLUSTER_STATE="new"#ETCD_STRICT_RECONFIG_CHECK="true"#ETCD_ENABLE_V2="true"##[Proxy]#ETCD_PROXY="off"#ETCD_PROXY_FAILURE_WAIT="5000"#ETCD_PROXY_REFRESH_INTERVAL="30000"#ETCD_PROXY_DIAL_TIMEOUT="1000"#ETCD_PROXY_WRITE_TIMEOUT="5000"#ETCD_PROXY_READ_TIMEOUT="0"##[Security]#ETCD_CERT_FILE=""#ETCD_KEY_FILE=""#ETCD_CLIENT_CERT_AUTH="false"#ETCD_TRUSTED_CA_FILE=""#ETCD_AUTO_TLS="false"#ETCD_PEER_CERT_FILE=""#ETCD_PEER_KEY_FILE=""#ETCD_PEER_CLIENT_CERT_AUTH="false"#ETCD_PEER_TRUSTED_CA_FILE=""#ETCD_PEER_AUTO_TLS="false"##[Logging]#ETCD_DEBUG="false"#ETCD_LOG_PACKAGE_LEVELS=""#ETCD_LOG_OUTPUT="default"##[Unsafe]#ETCD_FORCE_NEW_CLUSTER="false"##[Version]#ETCD_VERSION="false"#ETCD_AUTO_COMPACTION_RETENTION="0"##[Profiling]#ETCD_ENABLE_PPROF="false"#ETCD_METRICS="basic"##[Auth]#ETCD_AUTH_TOKEN="simple"

启动etcd服务：

systemctl start etcd

查看etcd健康状态：

etcdctl -C http://etcd:2379 cluster-healthetcdctl -C http://etcd:4001 cluster-health

1. flannel安装 安装命令：

yum install flannel

配置flannel:

vim /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=""

配置etcd中关于flannel的key:

etcdctl mk /atomic.io/network/config '{ "Network": "10.0.0.0/16" }'

启动flanneld并设置开机启动：

systemctl start flanneld.servicesystemctl enable flanneld.service

1. docker安装 安装docker并启动，并设置开机启动:

yum install docker -yservice docker startchkconfig docker on

1. kubernets安装 安装k8s：

yum install kubernetes

配置/etc/kubernetes/apiserver文件：

#### 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="--address=0.0.0.0"# The port on the local server to listen on.KUBE_API_PORT="--port=8080"# Port minions listen onKUBELET_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=""

配置/etc/kubernetes/config文件

#### 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://master:8080"

启动k8s各组件：

systemctl start kube-apiserver.servicesystemctl start kube-controller-manager.servicesystemctl start kube-scheduler.service

设置k8s个组件开机启动：

systemctl enable kube-apiserver.servicesystemctl enable kube-controller-manager.servicesystemctl enable kube-scheduler.service

第三步：部署node节点

node节点需要安装以下组件：

• flannel

• docker

• kubernetes

1. flannel安装 安装命令：

yum install flannel

配置flannel:

vim /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=""

启动flannel并设置开机启动：

systemctl start flanneld.servicesystemctl enable flanneld.service

1. docker安装 安装docker并启动，并设置开机启动:

yum install docker -yservice docker startchkconfig docker on

1. kubernetes安装 安装命令：

yum install kubernetes

不同于master节点，slave节点上需要运行kubernetes的如下组件：

* kubelet* kubernets-proxy

配置/etc/kubernetes/config:

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://master:8080"

配置/etc/kubernetes/kubelet:

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 onKUBELET_PORT="--port=10250"# You may leave this blank to use the actual hostnameKUBELET_HOSTNAME="--hostname-override=node1"# location of the api-serverKUBELET_API_SERVER="--api-servers=http://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kube服务:

systemctl start kubelet.servicesystemctl start kube-proxy.service

设置k8s组件开机自启:

systemctl enable kubelet.servicesystemctl enable kube-proxy.service

至此为止，k8s集群的搭建过程就完成了，下面来验证一下集群是否搭建成功了

第四步：验证集群状态

查看端点信息：

kubectl get endpoints

查看集群信息：

kubectl cluster-info

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