1.关闭selinux
setenforce 0
vim /etc/selinux/config
SELINUX=diabled
2.配置转发参数
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
3.关掉防火墙
systemctl stop firewalld
systemctl diable firewalld
4.添加kubernetes源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
5.rpm安装kubeadm和docker
yum install kubeadm docker
systemctl start docker
systemctl start kubelet
systemctl enable docker kubelet
6.更改kubelet的启动参数，主要是为了和docker的cgroup一致
vim /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
# Note: This dropin only works with kubeadm and kubelet v1.11+
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --cgroup-driver=systemd"
Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
Environment="KUBELET_CGROUP_ARGS=--cgroup-driver=systemd --runtime-cgroups=/systemd/system.slice --kubelet-cgroups=/systemd/system.slice"
# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
EnvironmentFile=-/etc/sysconfig/kubelet
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS $KUBELET_CGROUP_ARGS
7.无法访问k8s.gcr.io的情况下，通过docker.io下载kubeadm必要的镜像并修改tag
###kubeadm init初始化连接不到k8s.gcr.io会报错，然后提示出需要的镜像
docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.13.1
docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.13.1
docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.13.1
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.13.1
docker pull mirrorgooglecontainers/pause:3.1
docker pull mirrorgooglecontainers/etcd-amd64:3.2.24
docker pull coredns/coredns:1.2.6
###tag修改
docker tag docker.io/mirrorgooglecontainers/kube-proxy-amd64:v1.13.1 k8s.gcr.io/kube-proxy:v1.13.1
docker tag docker.io/mirrorgooglecontainers/kube-scheduler-amd64:v1.13.1 k8s.gcr.io/kube-scheduler:v1.13.1
docker tag docker.io/mirrorgooglecontainers/kube-apiserver-amd64:v1.13.1 k8s.gcr.io/kube-apiserver:v1.13.1
docker tag docker.io/mirrorgooglecontainers/kube-controller-manager-amd64:v1.13.1 k8s.gcr.io/kube-controller-manager:v1.13.1
docker tag docker.io/mirrorgooglecontainers/etcd-amd64:3.2.24 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:1.2.6 k8s.gcr.io/coredns:1.2.6
下面内容在master上单独操作
8.初始化k8s
kubeadm init --kubernetes-version=v1.13.1 --pod-network-cidr=10.244.0.0/16
###根据提示继续操作
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
####保存以下内容，在安装好后，在node节点上运行
kubeadm join 172.21.17.18:6443 --token rfe3jn.j3ceftk2n23rtbse --discovery-token-ca-cert-hash sha256:cf4276160c5fc2c09297bc20e4eb2bc3816cdeb359913f263f708242a591d363
9.安装网络插件，这里注意查看官方的文档，blog或者笔记有版本限制，导致出错
#官方文档地址
https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/#before-you-begin
#yaml文件地址
https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml
###根据yaml文件安装
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml
10.查看节点信息
kubectl get pods --all-namespaces
11.所有pod显示running表示成功，如果显示pendding或者ContainerCreating,查看详细信息
kubectl describe pods --namespace=kube-system pod-name
journalctl -f -xeu kubelet
12.节点加入忘了之前初始化提示的信息，可使用以下命令创建token
kubeadm token create --print-join-command