使用kubeadm安裝kubernetes1.12.2版本腳本

Master節點腳本:node

#!/bin/sh
#使用系統的PATH環境
export PATH
=`echo $PATH` #中止firewall防火牆,並禁止開機自啓動 systemctl stop firewalld.service systemctl disable firewalld.service #禁止selinux安全 sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config setenforce 0 #關閉swap交換內存,K8S強制的,否則安裝會報錯 swapoff -a sed -i 's/.*swap.*/#&/' /etc/fstab #配置內核參數 yum install bridge-utils -y modprobe br_netfilter cat <<EOF > /etc/sysctl.d/k8s.conf net.ipv4.ip_forward = 1 net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF #使配置生效 sysctl --system cat <<EOF > /etc/security/limits.d/20-nproc.conf * soft nproc 20480 * hard nproc 20480 * soft nofile 102400 * hard nofile 102400 root soft nproc unlimited EOF #設置主機名稱解析 cat >> /etc/hosts << EOF 192.168.20.210 docker-master1 192.168.20.211 docker-master2 192.168.20.212 docker-master3 192.168.20.213 docker-slave1 192.168.20.214 docker-slave2 EOF #安裝docker-ce-18.06.1版本 sudo yum install -y yum-utils device-mapper-persistent-data lvm2 sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo yum install -y docker-ce-18.06.1.ce-3.el7 systemctl enable docker && systemctl start docker #fixation docker version yum -y install yum-plugin-versionlock yum versionlock docker-ce #install kubernetes1.12.2 version cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF yum clean all && yum makecache yum -y install kubelet kubeadm kubectl kubernetes-cni systemctl enable kubelet.service && systemctl start kubelet.service #pull k8s images docker pull mirrorgooglecontainers/kube-apiserver:v1.12.2 docker pull mirrorgooglecontainers/kube-controller-manager:v1.12.2 docker pull mirrorgooglecontainers/kube-scheduler:v1.12.2 docker pull mirrorgooglecontainers/kube-proxy:v1.12.2 docker pull mirrorgooglecontainers/pause:3.1 docker pull mirrorgooglecontainers/etcd:3.2.24 docker pull coredns/coredns:1.2.2 #modefiy docker image tag docker tag docker.io/mirrorgooglecontainers/kube-proxy:v1.12.2 k8s.gcr.io/kube-proxy:v1.12.2 docker tag docker.io/mirrorgooglecontainers/kube-scheduler:v1.12.2 k8s.gcr.io/kube-scheduler:v1.12.2 docker tag docker.io/mirrorgooglecontainers/kube-apiserver:v1.12.2 k8s.gcr.io/kube-apiserver:v1.12.2 docker tag docker.io/mirrorgooglecontainers/kube-controller-manager:v1.12.2 k8s.gcr.io/kube-controller-manager:v1.12.2 docker tag docker.io/mirrorgooglecontainers/etcd:3.2.24 k8s.gcr.io/etcd:3.2.24 docker tag docker.io/mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1 docker tag docker.io/coredns/coredns:1.2.2 k8s.gcr.io/coredns:1.2.2 #delete source images tag docker rmi docker.io/mirrorgooglecontainers/kube-proxy:v1.12.2 docker rmi docker.io/mirrorgooglecontainers/kube-scheduler:v1.12.2 docker rmi docker.io/mirrorgooglecontainers/kube-apiserver:v1.12.2 docker rmi docker.io/mirrorgooglecontainers/kube-controller-manager:v1.12.2 docker rmi docker.io/mirrorgooglecontainers/etcd:3.2.24 docker rmi docker.io/mirrorgooglecontainers/pause:3.1 docker rmi docker.io/coredns/coredns:1.2.2 #init kubeadm master kubeadm init --kubernetes-version=v1.12.2 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=0.0.0.0 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
export KUBECONFIG=/etc/kubernetes/admin.conf

#安裝flannel網絡
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml

 當腳本執行完kubeadm init,會產生一個kubeadm join的命令,例如:linux

kubeadm join 192.168.20.210:6443 --token n962df.2bjqc7w81n2ufz3z --discovery-token-ca-cert-hash sha256:88d46eb99b43be7afa66d91a138393e1614a090772530d250dc6d75d59d863b5git

此命令是在node節點上執行將該node加入kubernetes集羣的。github

kubectl get pod -n kube-system 能夠查看該明明空間的程序運行情況。都爲Running爲正常。docker

除了安裝flannel網絡以外 還能夠安裝其餘網絡,能夠參考kubernetes集羣pod網絡bootstrap

 Node節點安裝腳本:centos

#!/bin/sh
#使用系統的PATH環境
export PATH=`echo $PATH`

#中止firewall防火牆,並禁止開機自啓動
systemctl stop firewalld.service
systemctl disable firewalld.service

#禁止selinux安全
sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
setenforce 0

#關閉swap交換內存,K8S強制的,否則安裝會報錯
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab

#配置內核參數
yum install bridge-utils -y
modprobe br_netfilter

cat <<EOF >  /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

#使配置生效
sysctl --system

cat <<EOF > /etc/security/limits.d/20-nproc.conf
*          soft    nproc     20480
*          hard    nproc     20480
*          soft    nofile    102400
*          hard    nofile    102400
root       soft    nproc     unlimited
EOF

#設置主機名稱解析
cat >> /etc/hosts << EOF
192.168.20.210    docker-master1
192.168.20.211    docker-master2
192.168.20.212    docker-master3
192.168.20.213    docker-slave1
192.168.20.214    docker-slave2
EOF

#安裝docker-ce-18.06.1版本
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum install -y docker-ce-18.06.1.ce-3.el7    
systemctl enable docker && systemctl start docker
#fixation docker version
yum -y install yum-plugin-versionlock
yum versionlock docker-ce

#install kubernetes1.12.2 version
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
        http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
yum clean all && yum makecache
yum -y install kubelet kubeadm kubectl kubernetes-cni
#pull k8s images 
docker pull mirrorgooglecontainers
/kube-proxy:v1.12.2
docker pull mirrorgooglecontainers
/pause:3.1
#modefiy docker image tag
docker tag docker.io
/mirrorgooglecontainers/kube-proxy:v1.12.2 k8s.gcr.io/kube-proxy:v1.12.2
docker tag docker.io
/mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
#delete source images tag
docker rmi docker.io
/mirrorgooglecontainers/kube-proxy:v1.12.2
docker rmi docker.io
/mirrorgooglecontainers/pause:3.1

 完成以上操做後在master上執行kubectl get nodes 既能夠查看全部節點狀態。Ready爲正常。api

1、master隔離安全

默認狀況下,出於安全緣由,您的羣集不會在主服務器上安排容器。若是您但願可以在主服務器上安排pod,例如,對於用於開發的單機Kubernetes集羣,請運行:服務器

kubectl taint nodes --all node-role.kubernetes.io/master-

輸出看起來像:

node "test-01" untainted
taint "node-role.kubernetes.io/master:" not found
taint "node-role.kubernetes.io/master:" not found

這將從node-role.kubernetes.io/master包含主節點的任何節點中刪除,這意味着調度程序將可以在任何地方安排pod。

2、後續加入node節點

節點是運行工做負載(容器和容器等)的位置。要向羣集添加新節點,請爲每臺計算機執行如下操做:

  • SSH到機器
  • 成爲根(例如sudo su -
  • 運行輸出的命令kubeadm init例如:
    kubeadm join --token <token> <master-ip>:<master-port> --discovery-token-ca-cert-hash sha256:<hash>

若是您沒有令牌,能夠經過在主節點上運行如下命令來獲取它:

kubeadm token list

輸出相似於:

TOKEN                    TTL  EXPIRES              USAGES           DESCRIPTION            EXTRA GROUPS
8ewj1p.9r9hcjoqgajrj4gi  23h  2018-06-12T02:51:28Z authentication,  The default bootstrap  system:
                                                   signing          token generated by     bootstrappers:
                                                                    'kubeadm init'.        kubeadm:
                                                                                           default-node-token

默認狀況下,令牌在24小時後過時。若是在當前令牌過時後將節點加入羣集,則能夠經過在主節點上運行如下命令來建立新令牌:

kubeadm token create

輸出相似於:

5didvk.d09sbcov8ph2amjw

若是沒有值--discovery-token-ca-cert-hash,能夠經過在主節點上運行如下命令鏈來獲取它:

openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | \
   openssl dgst -sha256 -hex | sed 's/^.* //'

輸出相似於:

8cb2de97839780a412b93877f8507ad6c94f73add17d5d7058e91741c9d5ec78

注意:要指定IPv6元組<master-ip>:<master-port>,必須將IPv6地址括在方括號中,例如:[fd00::101]:2073

幾秒鐘後,您應該能夠看到kubectl get nodes在主服務器上運行時輸出中的此節點

 

也能夠直接執行如下命令,獲取加入集羣節點的命令

kubeadm token create --print-join-command
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