1.kubernetes 之kubeadmin部署环境01

前置学习Docker知识：https://www.jianshu.com/c/961f67f48e81
官方文档：https://kubernetes.io/docs/setup/independent/install-kubeadm/

使用kubeadmin安装

1.硬件配置：

#2核cpu及以上，8G内存及以上 详情参考：https://www.kubernetes.org.cn/doc-16

k8s-master1：192.168.199.130
k8s-node1： 192.168.199.131
k8s-node2： 192.168.199.132

####配置master与node免密 
#k8s-node1，k8s-node2执行：
mkdir -p ~/.ssh

#k8s-master1执行：
ssh-keygen
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
scp ~/.ssh/authorized_keys k8s-node1:~/.ssh/
scp ~/.ssh/authorized_keys k8s-node2:~/.ssh/

2.所有机器需要执行的初始化操作

#所有机器执行命令关闭屏保,避免卡顿
setterm -blank 0

#关闭selinux及防火墙，重启机器生效
setenforce 0
vim /etc/selinux/config
修改为
SELINUX=disabled

systemctl stop firewalld
systemctl disable firewalld

#配置hosts
vim /etc/hosts
192.168.199.130   k8s-master1
192.168.199.131   k8s-node1
192.168.199.132   k8s-node2
systemctl restart network  #重启网络生效

#永久关闭swap， 
swapoff -a
vim /etc/fstab  #注释掉swap相关行即可

#配置aliyun yum源和k8s源
yum install -y wget
cd /etc/yum.repos.d/
tar -cvf bak.tgz *
rm -rf CentOS-*
wget  http://mirrors.aliyun.com/repo/Centos-7.repo
mv Centos-7.repo CentOS-Base.repo
wget https://mirrors.aliyun.com/repo/epel-7.repo

cat < /etc/yum.repos.d/k8s.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 update


#设置相关属性
cat </etc/sysctl.d/k8s.conf
vm.swappiness=0     
net.bridge.bridge-nf-call-ip6tables = 1     
net.bridge.bridge-nf-call-iptables = 1          
net.ipv4.ip_forward = 1
EOF
#执行命令生效 
modprobe br_netfilter
sysctl -p /etc/sysctl.d/k8s.conf

#配置命令补全
yum install -y bash-completion
echo 'source <(kubectl completion bash)' >> /etc/profile
source /etc/profile

#安装docker 并配置阿里云镜像加速器
yum install -y docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://i70c3eqq.mirror.aliyuncs.com"]
}
EOF

systemctl daemon-reload
systemctl restart docker
systemctl enable docker

#提前下载k8s相关镜像
docker pull k8s.gcr.io/kube-proxy-amd64:v1.11.1
docker pull k8s.gcr.io/kube-apiserver-amd64:v1.11.1
docker pull k8s.gcr.io/kube-controller-manager-amd64:v1.11.1
docker pull k8s.gcr.io/kube-scheduler-amd64:v1.11.1
docker pull k8s.gcr.io/coredns:1.1.3
docker pull quay.io/calico/node:v3.0.7
docker pull gcr.io/google_containers/heapster-amd64:v1.5.3
docker pull quay.io/calico/kube-controllers:v2.0.4
docker pull quay.io/calico/cni:v2.0.5
docker pull k8s.gcr.io/etcd-amd64:3.2.18
docker pull k8s.gcr.io/kubernetes-dashboard-amd64:v1.8.3
docker pull k8s.gcr.io/pause:3.1
docker pull gcr.io/google_containers/heapster-influxdb-amd64:v1.3.3
docker pull gcr.io/google_containers/heapster-grafana-amd64:v4.4.3
docker pull quay.io/coreos/etcd:v3.1.10

#安装k8s相关软件
yum install -y kubernetes-cni-0.6.0 
yum install -y  kubeadm-1.11.1 kubectl-1.11.1 kubelet-1.11.1

#修改kubelet启动参数
cat < /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="--fail-swap-on=false --runtime-cgroups=/lib/systemd/system/kubelet.service --kubelet-cgroups=/lib/systemd/system/kubelet.service" 
EOF

#启动服务
systemctl restart docker
systemctl restart kubelet
systemctl enable kubelet

#查看服务是否启动
systemctl is-active kubelet

k8s-master1上执行

#kubeadm 初始化
kubeadm init --kubernetes-version=v1.11.1 --pod-network-cidr=10.244.0.0/16

#创建集群登录信息
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

#安装flannel网络 ，详细信息：https://v1-11.docs.kubernetes.io/docs/setup/
#注意 kube-flannel.yml中的网段信息与kubeadm 初始化时要相同，记得修改
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml

k8s-node1,k8s-node2上执行

#master 主机上查看taken
[root@k8s-master1 /]# kubeadm token create --print-join-command
kubeadm join 192.168.199.130:6443 --token 56dm7f.qcswziskyrs6h2b0 --discovery-token-ca-cert-hash sha256:38328747d17b4bff37ce5f9982c41ecdb54892f41465be46cdc10ab743ecf83d

#k8s-node1，k8s-node2 上执行一下命令，将其加入k8s-master1
 kubeadm join 192.168.199.130:6443 --token p8ymwx.flsbhmoep3giidlb --discovery-token-ca-cert-hash sha256:38328747d17b4bff37ce5f9982c41ecdb54892f41465be46cdc10ab743ecf83d

执行完以上命令

#master上查看节点
[root@k8s-master1 /]# kubectl get nodes
NAME          STATUS    ROLES     AGE       VERSION
k8s-master1   Ready     master    1h        v1.11.1
k8s-node1     Ready         1m        v1.11.1
k8s-node2     Ready         1m        v1.11.1

#查看集群状态
[root@k8s-master1 /]# kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
controller-manager   Healthy   ok                   
scheduler            Healthy   ok                   
etcd-0               Healthy   {"health": "true"}   

重新部署环境

#master 和 node节点都执行以下命令即可初始化环境
kubeadm reset
ifconfig cni0 down
ip link delete cni0
ifconfig flannel.1 down
ip link delete flannel.1
rm -rf /var/lib/cni/