【k8s】搭建步驟

搭建步驟

 基礎概念：https://www.cnblogs.com/sxdcgaq8080/p/10640879.html

=======================================環境準備階段=========================================

 

1.新建三個虛擬機CentOS

參考地址：http://www.javashuo.com/article/p-wypilhkx-ew.html
master 4G 50G
Node1 2G 40G
Node2 2G 40G

【須要注意的是，三臺服務器上儘可能不要已經安裝了docker，不然會致使etcd安裝失敗，由於版本匹配的問題！！】 

2.分別設置root帳號 密碼

 

3.分別啓動網卡，得到IP，讓本機的xshell能夠鏈接上幾臺服務器

參考地址：http://www.javashuo.com/article/p-cmtxwqvm-dw.html

4.分別修改靜態主機名爲

參考地址：https://www.cnblogs.com/sxdcgaq8080/p/10616441.html

192.168.92.131 k8s-master
192.168.92.132 k8s-node1
192.168.92.133 k8s-node2

分別在三臺主機上輸入命令

192.168.92.131輸入：

hostnamectl --static set-hostname  k8s-master

 

 

192.168.92.132輸入：

hostnamectl --static set-hostname  k8s-node1

 

 

 

 

192.168.92.133輸入：

hostnamectl --static set-hostname  k8s-node2

 

 

 

5.分別在三臺服務器的/etc/hosts文件中添加

192.168.92.131    k8s-master 192.168.92.131 etcd 192.168.92.131 registry 192.168.92.132    k8s-node1 192.168.92.133    k8s-node2

 

使用如下命令修改便可：

vi /etc/hosts

 

 

 

 

6.分別關閉並禁用三臺服務器的防火牆

參考地址：https://www.cnblogs.com/sxdcgaq8080/p/10032829.html

使用如下命令：【先停用，後禁用】

systemctl stop firewalld.service

systemctl disable firewalld.service 

再使用查看命令查看，若是是以下效果，說明成功

firewall-cmd --state

 

 

====================================主要安裝步驟開始=====================================

 

1、主節點安裝

主節點須要安裝

etcd 存儲數據中心

flannel k8s的一種網絡方案

kubernetes 【包含：kube-api-server  controllerManager   Scheduler 】

 

1.etcd的安裝

　　1.1 命令

yum install -y etcd

 

 

　　1.2 修改配置文件

 命令

vi /etc/etcd/etcd.conf

修改內容爲：

# [member] ETCD_NAME=master ETCD_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://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_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="" #ETCD_STRICT_RECONFIG_CHECK="false" #ETCD_AUTO_COMPACTION_RETENTION="0" #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" # examples for -log-package-levels etcdserver=WARNING,security=DEBUG #ETCD_LOG_PACKAGE_LEVELS="" # #[profiling] #ETCD_ENABLE_PPROF="false" #ETCD_METRICS="basic" # #[auth] #ETCD_AUTH_TOKEN="simple"

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　　1.3 啓動etcd服務並驗證

啓動etcd服務命令

systemctl start etcd

設置etcd服務自啓動

systemctl enable etcd

 

 

檢查健康情況

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

 

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

 

 

 2.安裝flannel

　　2.1 安裝命令

yum install -y flannel

 

 

　　 2.2 配置flannel

命令：

vi /etc/sysconfig/flanneld

修改內容爲：

# Flanneld configuration options # etcd url location. Point this to the server where etcd runs FLANNEL_ETCD_ENDPOINTS="http://etcd:2379" # etcd config key. This is the configuration key that flannel queries # For address range assignment FLANNEL_ETCD_PREFIX="/atomic.io/network" # Any additional options that you want to pass #FLANNEL_OPTIONS=""

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　　2.3 配置etcd中關於flannel的key

命令

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

 

　　2.4 啓動flannel服務，並設置開機自啓

 

systemctl start flanneld.service

systemctl enable flanneld.service

 

 

3.安裝kubernetes

　　3.1 安裝命令

yum install kubernetes

 

　　3.2安裝後，須要修改配置

配置修改是爲了下面這些須要運行的組件

kube-api-server

kuber-scheduler

kube-controller-manager

 

命令：

vi /etc/kubernetes/apiserver

更改內容爲：

### # 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 on KUBELET_PORT="--kubelet-port=10250" # Comma separated list of nodes in the etcd cluster KUBE_ETCD_SERVERS="--etcd-servers=http://etcd:2379" # Address range to use for services KUBE_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=""

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命令：

vi /etc/kubernetes/config

更改內容爲：

### # 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://k8s-master:8080"

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　　3.3 分別啓動三個組件服務，而且設置爲自啓動

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

 

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

 

　　

 

4.安裝docker

參考地址：http://www.javashuo.com/article/p-fkwyppsi-ba.html

docker必定要最後安裝，不然報錯，解決方法：https://www.cnblogs.com/sxdcgaq8080/p/10622695.html

 　　4.1 安裝docker命令：

yum install  -y docker

　　4.2 啓動docker服務命令：

service docker start

　　4.3 docker加入自啓動服務命令：

chkconfig docker on

 

 

 

二.子節點安裝

子節點安裝須要安裝如下組件：

flannel

kubernetes

docker

【注意，兩個子節點都要按照下面步驟安裝】

 

1.flannel安裝

　　1.1 安裝命令：

yum install flannel

 

　　1.2 配置flannel

修改配置文件：

vi /etc/sysconfig/flanneld

配置文件修改成下：

# Flanneld configuration options # etcd url location. Point this to the server where etcd runs FLANNEL_ETCD_ENDPOINTS="http://etcd:2379" # etcd config key. This is the configuration key that flannel queries # For address range assignment FLANNEL_ETCD_PREFIX="/atomic.io/network" # Any additional options that you want to pass #FLANNEL_OPTIONS=""

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　　1.3 啓動flannel服務並設置自啓動

systemctl start flanneld.service

systemctl enable flanneld.service

 

 

2.安裝kubernetes

　　2.1 安裝命令

yum install kubernetes

　　

　　2.2 配置文件修改

子節點上須要運行的kubernetes組件是：

kubelet

kubernetes-proxy

 

修改配置文件命令：

vi /etc/kubernetes/config

 

兩個子節點都修改配置文件內容爲：

### # 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://k8s-master:8080"

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修改配置文件命令：

vi /etc/kubernetes/kubelet

 

此處的配置文件內容，須要注意區分【k8s-node1】和【k8s-node2】，分別在兩個節點上的配置文件的內容：

【紅色字體標註部分，須要自行修改】

### # 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 hostname KUBELET_HOSTNAME="--hostname-override=k8s-node1" # location of the api-server KUBELET_API_SERVER="--api-servers=http://k8s-master: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=""

 

　　2.3 分別啓動兩個子節點上的kubelet服務和kube-proxy服務，並設置自啓動

 

systemctl start kubelet.service

systemctl start kube-proxy.service

 

systemctl enable kubelet.service

systemctl enable kube-proxy.service

 

 

3.docker安裝

分別在兩個子節點上執行以下命令：

 

　　3.1 安裝docker命令：

yum install  -y docker

　　3.2 啓動docker服務命令：

service docker start

　　3.3 docker加入自啓動服務命令：

chkconfig docker on

 

 

================================================================

************************* 　　 到此處，k8s集羣搭建完成　　　　************************

================================================================

 

 

 

三.驗證集羣狀態

 

1.master節點執行命令，查看端點信息

kubectl get endpoints

 

 

2.master節點執行命令，查看集羣信息

kubectl cluster-info

 

 

3.master節點執行命令，獲取節點信息

kubectl get nodes

 

 

 

如上，即k8s集羣良好！！！！

 

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參考地址：https://www.jianshu.com/p/7d1fb03b8925