上面脚本创建了的/etc/sysconfig/modules/ipvs.modules文件，保证在节点重启后能自动加载所需模块。 使用lsmod | grep -e ip_vs -e nf_conntrack_ipv4命令查看是否已经正确加载所需的内核模块.
接下来还需要确保各个节点上已经安装了ipset软件包yum install ipset。 为了便于查看ipvs的代理规则，最好安装一下管理工具ipvsadm yum install ipvsadm
yum install ipset -y
yum install ipvsadm -y
如果以上前提条件如果不满足，则即使kube-proxy的配置开启了ipvs模式，也会退回到iptables模式
systemctl enable ntpdate.service
echo '*/30 * * * * /usr/sbin/ntpdate time7.aliyun.com >/dev/null 2>&1'> /tmp/crontab2.tmp
crontab /tmp/crontab2.tmp
systemctl start ntpdate.service
echo "* soft nofile 65536" >> /etc/security/limits.conf
echo "* hard nofile 65536" >> /etc/security/limits.conf
echo "* soft nproc 65536" >>/etc/security/limits.conf
echo "* hard nproc 65536" >>/etc/security/limits.conf
echo "* soft memlock unlimited" >> /etc/security/limits.conf
echo "* hard memlock unlimited" >>/etc/security/limits.conf
安装docker
yum install -y epel-release
yum install -y yum-utils device-mapper-persistent-data lvm2 net-tools conntrack-toolswget vim ntpdate libseccomp libtool-ltdltelnet rsync bind-utils
yum install -y https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/Packages/docker-ce-18.06.1.ce-3.el7.x86_64.rpm
配置docker国内镜像:
所有节点安装docker
编辑/etc/docker/daemon.json，添加以下一行
{
"registry-mirrors":["https://registry.docker-cn.com"]
}重启docker
systemctl daemon-reload
systemctl enable docker
systemctl start docker
注：如果使用overlay2的写法：
daemon.json
{
"log-driver": "json-file",
"log-opts": {
"max-size": "100m",
"max-file": "10"
},
"registry-mirrors": ["https://pqbap4ya.mirror.aliyuncs.com"],
"storage-driver": "overlay2",
"storage-opts":["overlay2.override_kernel_check=true"]
}如果要使用overlay2，前提条件为使用ext4，如果使用xfs，需要格式化磁盘加上参数 mkfs.xfs -n ftype=1 /path/to/your/device ，ftype=1这个参数需要配置为1
安装keepalived+haproxy
三台master 节点
略
VIP : 192.168.3.80
安装 kubeadm, kubelet 和 kubectl
所有节点都执行
设置yum源
cat < /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
安装组件
yum install -y kubelet-1.13.1 kubeadm-1.13.1 kubectl-1.13.1
开机启动
systemctl enable kubelet.service
初始化K8S集群
编辑kubeadm配置文件:
下面配置是kubeadm安装etcd写法：
cat > kubeadm-config.yaml << EOF apiVersion: kubeadm.k8s.io/v1beta1 kind: ClusterConfiguration kubernetesVersion: v1.13.1 apiServer: certSANs: - "192.168.3.80" controlPlaneEndpoint: "192.168.3.80:8443" networking: podSubnet: "10.50.0.0/16" imageRepository: "harbor.oneitfarm.com/k8s-cluster-images" EOF
CNI使用Calico，设置podSubnet: “10.50.0.0/16”
192.168.3.80是刚才安装haproxy+keepalived的VIP
初始化第一个master
kubeadm init --config kubeadm-config.yaml ... [root@master01 ~]# mkdir -p $HOME/.kube [root@master01 ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config [root@master01 ~]# chown $(id -u):$(id -g) $HOME/.kube/config
安装网络插件
按官网方式：
Installing with the Kubernetes API datastore—50 nodes or less：
kubectl apply -f \ https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/rbac-kdd.yaml kubectl apply -f \ https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/kubernetes-datastore/calico-networking/1.7/calico.yaml
以上建议先wget下来，需要根据自己网络修改配置 ：
- name: CALICO_IPV4POOL_CIDR value: "10.50.0.0/16"
复制相关文件到其他master节点
ssh root@master02 mkdir -p /etc/kubernetes/pki/etcd scp /etc/kubernetes/admin.conf root@master02:/etc/kubernetes scp /etc/kubernetes/pki/{ca.*,sa.*,front-proxy-ca.*} root@master02:/etc/kubernetes/pki scp /etc/kubernetes/pki/etcd/ca.* root@master02:/etc/kubernetes/pki/etcd部署master-other
在其它slave节点上执行下面命令，加入集群
kubeadm join 192.168.3.80:8443 --token pv2a9n.uh3yx1082ffpdf7n --discovery-token-ca-cert-hash sha256:872cac35b0bfec28fab8f626a727afa6529e2a63e3b7b75a3397e6412c06ebc5 --experimental-control-plane
kube-proxy开启ipvs
修改ConfigMap的kube-system/kube-proxy中的config.conf，mode: “ipvs”：
kubectl edit configmap kube-proxy -n kube-system kubectl get pod -n kube-system | grep kube-proxy | awk '{system("kubectl delete pod "$1" -- grace-period=0 --force -n kube-system")}'检查测试
查看kubernetes集群状态
kubectl get nodes -o wide kubectl get cs NAME STATUS MESSAGE ERROR controller-manager Healthy ok scheduler Healthy ok etcd-0 Healthy {"health": "true"}查看etcd集群状态
本文通过kubeadm自动安装etcd，也就是docker方式安装的etcd,可以exec进去容器内检查：
kubectl exec -ti -n kube-system etcd-an-master01 sh / # export ETCDCTL_API=3 / # etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key member list
安装失败清理集群
集群初始化如果遇到问题，可以使用下面的命令进行清理：
kubeadm reset systemctl stop kubelet systemctl stop docker rm -rf /var/lib/cni/ rm -rf /var/lib/kubelet/* rm -rf /etc/cni/ ifconfig cni0 down ifconfig flannel.1 down ifconfig docker0 down ip link delete cni0 ip link delete flannel.1 systemctl start docker
设置资源调度
使用kubeadm初始化的集群，出于安全考虑Pod不会被调度到Master Node上，也就是说Master Node不参与工作负载。这是因为当前的master节点被打上了node-role.kubernetes.io/master:NoSchedule的污点：
kubectl describe node master01 | grep Taint Taints: node-role.kubernetes.io/master:NoSchedule
检查join进集群的master和work节点，如果调度不对，可以通过如下方式设置：
[root@an-master01 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION an-master01 Ready master 4h49m v1.13.1 an-master02 Ready 4h42m v1.13.1 an-master03 Ready master 86m v1.13.1 an-work01 Ready 85m v1.13.1 查看当前状态： kubectl describe nodes/an-master02 |grep -E '(Roles|Taints)' Roles: Taints: 设置为master节点且不调度： kubectl label node an-master02 node-role.kubernetes.io/master= kubectl taint nodes an-master02 node-role.kubernetes.io/master=:NoSchedule 如果想去除限制的话： kubectl taint nodes an-master03 node-role.kubernetes.io/master- work节点设置： kubectl label node an-work01 node-role.kubernetes.io/work= kubectl describe nodes/an-work01 |grep -E '(Roles|Taints)' Roles: work Taints:
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