kubeadm安裝k8s集群kubeadm安裝Kubernetes V1.16.2集群詳細(xì)文檔kubeadm安裝

安裝環(huán)境（vm15.0.4下虛擬機3臺，centos 7.6）：

Master：192.168.10.100

Node1：192.168.10.101

Node2：192.168.10.102

1:安裝虛擬機，配置網(wǎng)絡(luò)接口，使虛擬機訪問訪問正常

2：修改主機名

hostnamectl set-hostname kube-master

hostnamectl set-hostname kube-node1

hostnamectl set-hostname kube-node2

3:配置主機映射

[root@kube-master ~]# more /etc/hosts

127.0.0.1? localhost localhost.localdomain localhost4 localhost4.localdomain4

::1? ? ? ? localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.10.100? kube-master

192.168.10.101? kube-node1

192.168.10.102? kube-node2

4：kube-master上配置免密鑰登陸

ssh-keygen #一路回車即可

ssh-copy-id? kube-master

ssh-copy-id? kube-node1

ssh-copy-id? kube-node2

5：三臺主機關(guān)閉防火墻，selinux，配置系統(tǒng)內(nèi)核

#關(guān)閉防火墻

systemctl stop firewalld

systemctl disable firewalld

#關(guān)閉selinux

sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/sysconfig/selinux

sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config

sed -i "s/^SELINUX=permissive/SELINUX=disabled/g" /etc/sysconfig/selinux

sed -i "s/^SELINUX=permissive/SELINUX=disabled/g" /etc/selinux/config

#配置系統(tǒng)內(nèi)核

echo 1 >/proc/sys/net/bridge/bridge-nf-call-iptables

echo 1 >/proc/sys/net/bridge/bridge-nf-call-ip6tables

6：配置yum源環(huán)境（使用阿里云鏡像）三臺主機配置

#docker-ce yum源配置

cd /etc/yum.repos.d/

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# kubernetes yum源配置

cd? /etc/yum.repos.d

[root@k8s-master yum.repos.d]# cat kubenetes.repo

[kubernetes]

name=Kubernetes Repo

baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/

gpgcheck=1? ?

gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg

enabled=1

yum repolist 檢測yum源列表

7:gpg校驗配置，三臺主機配置

下載校驗文件

wget https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

wget https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg

導(dǎo)入校驗文件

rpm --import rpm-package-key.gpg

rpm --import yum-key.gpg

8:安裝docker-ce，kubeadm組件

master節(jié)點安裝

yum install docker-ce kubelet kubeadm kubectl

node節(jié)點安裝

yum install docker-ce kubelet kubeadm

9:啟動docker，kubelet

編輯kubelet的配置文件/etc/sysconfig/kubelet，設(shè)置其忽略Swap啟用的狀態(tài)錯誤，內(nèi)容如下: KUBELET_EXTRA_ARGS="--fail-swap-on=false"? master以及node節(jié)點均需設(shè)置；

[root@k8s-master yum.repos.d]# cat /etc/sysconfig/kubelet

KUBELET_EXTRA_ARGS="--fail-swap-on=false"

google的鏡像倉庫k8s.grc.io國內(nèi)無法訪問，如有代理服務(wù)器，則編輯docker.service文件，添加代理服務(wù)器

vim /usr/lib/systemd/system/docker.service

添加如下內(nèi)容

Environment="HTTPS_PROXY=https://[proxy-addr]:[proxy-port]/"

保存退出，從新加載配置文件，重啟docker

systemctl daemon-reload

systemctl restart docker

設(shè)置docker，kubelet開機自啟動，開啟docker

systemctl enable docker kubelet

systemctl start docker

無代理服務(wù)，可以把k8s的軟件包下載到本地安裝，通過（docker load）命令加載tar包；

10:初始化master節(jié)點,node節(jié)點

master節(jié)點需要pull完成的相關(guān)鏡像

k8s.gcr.io/kube-proxy? ? ? ? ? ? ? ? v1.16.2? ? ? ? ? ? 8454cbe08dc9? ? ? ? 2 days ago? ? ? ? ? 86.1MB

k8s.gcr.io/kube-scheduler? ? ? ? ? ? v1.16.2? ? ? ? ? ? ebac1ae204a2? ? ? ? 2 days ago? ? ? ? ? 87.3MB

k8s.gcr.io/kube-controller-manager? v1.16.2? ? ? ? ? ? 6e4bffa46d70? ? ? ? 2 days ago? ? ? ? ? 163MB

k8s.gcr.io/kube-apiserver? ? ? ? ? ? v1.16.2? ? ? ? ? ? c2c9a0406787? ? ? ? 2 days ago? ? ? ? ? 217MB

k8s.gcr.io/etcd? ? ? ? ? ? ? ? ? ? ? 3.3.15-0? ? ? ? ? ? b2756210eeab? ? ? ? 6 weeks ago? ? ? ? 247MB

k8s.gcr.io/coredns? ? ? ? ? ? ? ? ? 1.6.2? ? ? ? ? ? ? bf261d157914? ? ? ? 2 months ago? ? ? ? 44.1MB

quay.io/coreos/flannel? ? ? ? ? ? ? v0.11.0-amd64? ? ? ff281650a721? ? ? ? 8 months ago? ? ? ? 52.6MB

k8s.gcr.io/pause? ? ? ? ? ? ? ? ? ? 3.1? ? ? ? ? ? ? ? da86e6ba6ca1? ? ? ? 22 months ago? ? ? 742kB

node節(jié)點需要pull完成的相關(guān)鏡像

k8s.gcr.io/kube-proxy? ? v1.16.2? ? ? ? ? ? 8454cbe08dc9? ? ? ? 2 days ago? ? ? ? ? 86.1MB

quay.io/coreos/flannel? ? v0.11.0-amd64? ? ? ff281650a721? ? ? ? 8 months ago? ? ? ? 52.6MB

k8s.gcr.io/pause? ? ? ? ? 3.1? ? ? ? ? ? ? ? da86e6ba6ca1? ? ? ? 22 months ago? ? ? 742kB

目前默認(rèn)版本為1.16.2

kubeadm init --help 查看啟動參數(shù) 默認(rèn)監(jiān)聽端口6443

kubeadm init --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap

啟動完成后會顯示join命令，記得保存

根據(jù)提示完成非root用戶配置

mkdir ~/.kube

cp /etc/kubernetes/admin.conf ~/.kube/

chown $(id -u):$(id -g) $HOME/.kube/config

檢查啟動情況(nodes此時還只有master節(jié)點，未安裝flannel時候狀態(tài)不是ready)

[root@kube-master yum.repos.d]# kubectl get componentstatus

NAME? ? ? ? ? ? ? ? STATUS? ? MESSAGE? ? ? ? ? ? ? ERROR

scheduler? ? ? ? ? ? Healthy? ok? ? ? ? ? ? ? ? ?

controller-manager? Healthy? ok? ? ? ? ? ? ? ? ?

etcd-0? ? ? ? ? ? ? Healthy? {"health": "true"}?

[root@kube-master ~]# kubectl get nodes

NAME? ? ? ? ? STATUS? ROLES? ? AGE? VERSION

kube-master? Ready? ? master? 24h? v1.16.2

kube-node1? ? Ready? ? <none>? 23h? v1.16.2

kube-node2? ? Ready? ? <none>? 23h? v1.16.2

11:安裝flannel組件

coredns依賴flannel組件，未安裝flannel時候查看coredns的狀態(tài)為prending

[root@kube-master ~]# kubectl get pods -n kube-system -o wide

NAME? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? READY? STATUS? ? RESTARTS? AGE? IP? ? ? ? ? ? ? NODE? ? ? ? ? NOMINATED NODE? READINESS GATES

coredns-5644d7b6d9-lt5kp? ? ? ? ? ? ? 1/1? ? Running? 2? ? ? ? ? 24h? 10.244.0.7? ? ? kube-master? <none>? ? ? ? ? <none>

coredns-5644d7b6d9-nblnl? ? ? ? ? ? ? 1/1? ? Running? 2? ? ? ? ? 24h? 10.244.0.6? ? ? kube-master? <none>? ? ? ? ? <none>

etcd-kube-master? ? ? ? ? ? ? ? ? ? ? 1/1? ? Running? 2? ? ? ? ? 24h? 192.168.10.100? kube-master? <none>? ? ? ? ? <none>

kube-apiserver-kube-master? ? ? ? ? ? 1/1? ? Running? 2? ? ? ? ? 24h? 192.168.10.100? kube-master? <none>? ? ? ? ? <none>

kube-controller-manager-kube-master? 1/1? ? Running? 2? ? ? ? ? 24h? 192.168.10.100? kube-master? <none>? ? ? ? ? <none>

kube-proxy-5c5km? ? ? ? ? ? ? ? ? ? ? 1/1? ? Running? 2? ? ? ? ? 23h? 192.168.10.101? kube-node1? ? <none>? ? ? ? ? <none>

kube-proxy-j56kp? ? ? ? ? ? ? ? ? ? ? 1/1? ? Running? 2? ? ? ? ? 23h? 192.168.10.102? kube-node2? ? <none>? ? ? ? ? <none>

kube-proxy-pvlzt? ? ? ? ? ? ? ? ? ? ? 1/1? ? Running? 2? ? ? ? ? 24h? 192.168.10.100? kube-master? <none>? ? ? ? ? <none>

kube-scheduler-kube-master? ? ? ? ? ? 1/1? ? Running? 2? ? ? ? ? 24h? 192.168.10.100? kube-master? <none>? ? ? ? ? <none>

安裝flannel

master節(jié)點

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

正常會自動pull flannel鏡像，如網(wǎng)絡(luò)不穩(wěn)定，可以手動pull

docker pull quay.io/coreos/flannel:v0.11.0-amd64

node節(jié)點在加入k8s之后會自動pull flannel鏡像，無需額外配置；

12:node節(jié)點加入k8s

kubeadm join 192.168.10.100:6443 --token 5zx03y.ixb80qum7ktmu1mk --discovery-token-ca-cert-hash sha256:7b2a69f18281cb245a417f53dbd18076583556adbfcba29a70858e780300c3c7 --ignore-preflight-errors=Swap

查看狀態(tài)

[root@kube-master ~]# kubectl get nodes

NAME? ? ? ? ? STATUS? ROLES? ? AGE? VERSION

kube-master? Ready? ? master? 24h? v1.16.2

kube-node1? ? Ready? ? <none>? 23h? v1.16.2

kube-node2? ? Ready? ? <none>? 23h? v1.16.2

13:安裝kubectl補全命令

yum install bash-completion

source /usr/share/bash-completion/bash_completion

source <(kubectl completion bash)

14:可能碰到的問題，如果受用kubectl命令報連接不上8080端口，使用下面配置

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

source ~/.bash_profile