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kubeadm搭建高可用kubernetes1.15.1

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IP角色操作系统备注
192.168.10.210 master CentOS 7 haproxy,keepalived主
192.168.10.211 master CentOS 7 haproxy,keepalived备
192.168.10.212 master CentOS 7 haproxy,keepalived备
192.168.10.213 node CentOS 7 只做节点

主机准备:
1.安装必要软件以及升级所有软件

yum -y install vim-enhanced wget curl net-tools conntrack-tools bind-utils socat ipvsadm ipset
yum -y update

2.关闭selinux

sed -i 's#SELINUX=enforcing#SELINUX=disabled#g'  /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g'  /etc/selinux/config

3.关闭不必要服务

systemctl disable auditd
systemctl disable postfix
systemctl disable irqbalance
systemctl disable remote-fs
systemctl disable tuned
systemctl disable rhel-configure
systemctl disable firewalld

4.安装kernel-lt(kernel 4.4.178)

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum -y install https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-lt -y

grub2-set-default 0
grub2-mkconfig -o /etc/grub2.cfg

5.优化内核

cat >>/etc/sysctl.conf <

6.修改文件打开数

cat >>/etc/security/limits.conf <

7.系统关闭使用交换内存

echo "swapoff -a">>/etc/rc.local
chmod +x /etc/rc.local
swapoff -a

8.安装docker

yum -y install docker
curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://e2a6d434.m.daocloud.io
sed -i 's#,##g' /etc/docker/daemon.json
service docker start 
chkconfig docker on

9.内核加载ipvs_rr、ipvs_wrr、ipvs_sh模块

cat </etc/sysconfig/modules/ipvs.modules 
#!/bin/bash
ipvs_modules="ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_fo ip_vs_nq ip_vs_sed ip_vs_ftp nf_conntrack_ipv4"
for kernel_module in \${ipvs_modules}; do
 /sbin/modinfo -F filename \${kernel_module} > /dev/null 2>&1
 if [ $? -eq 0 ]; then
 /sbin/modprobe \${kernel_module}
 fi
done
EOF

chmod +x /etc/sysconfig/modules/ipvs.modules
sh /etc/sysconfig/modules/ipvs.modules

10.安装kubeadm、kubelet、kubectl

mkdir /etc/yum.repos.d/bak && cp -rf /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.cloud.tencent.com/repo/epel-7.repo
 yum clean all && yum makecache
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
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet

11.安装以及配置haproxy

yum -y install haproxy
cat </etc/haproxy/haproxy.cfg 
global
    #   /etc/sysconfig/syslog
    #
    #    local2.*                       /var/log/haproxy.log
    #
    log         127.0.0.1 local2

    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon

defaults
    mode                    tcp
    log                     global
    retries                 3
    timeout connect         10s
    timeout client          1m
    timeout server          1m

frontend  kubernetes
        bind *:8443
        mode tcp
        default_backend kubernetes_master

backend kubernetes_master
    balance     roundrobin
    server 210 192.168.10.210:6443 check maxconn 2000
    server 211 192.168.10.211:6443 check maxconn 2000
    server 212 192.168.10.212:6443 check maxconn 2000
EOF

systemctl start haproxy
systemctl enable haproxy

12.安装及配置keepalived

yum -y install keepalived
cat </etc/keepalived/keepalived.conf
global_defs {
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   // vrrp_strict  加了这个参数VIP无法PING通
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER   #角色需要修改
    interface ens32  #此处需要修改为网卡的名称,有的是eth0
    virtual_router_id 51
    priority 100     #每台机器此处不同
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.10.200
    }
}
EOF

service keepalived start
systemctl enable keepalived

注意:
1.如果是其他机器的话，state应当修改为BACKUP,同时priority的值应当低于MASTER
2.interface需要修改为网卡的名称
3.一开始配置keepalived的时候VIP已经在某台机器了，但是随后发现无法ping通，端口也无法访问，最后发现是vrrp_strict 这个参数需要注释

13.配置kubeadm配置文件

cat << EOF > /root/init.yaml
apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
localAPIEndpoint:
  advertiseAddress: 192.168.10.210
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: node210
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
clusterName: kubernetes
kubernetesVersion: v1.15.1
certificatesDir: /etc/kubernetes/pki
controllerManager: {}
controlPlaneEndpoint: "192.168.10.200:8443"
imageRepository: registry.aliyuncs.com/google_containers
apiServer:
  timeoutForControlPlane: 4m0s
  certSANs:
  - "node210"
  - "node211"
  - "node212"
  - "192.168.10.210"
  - "192.168.10.211"
  - "192.168.10.212"
  - "192.168.10.212"
  - "192.168.10.200"
  - "127.0.0.1"
DNS:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
networking:
  dnsDomain: cluster.local
  serviceSubnet: 10.253.0.0/16
  podSubnet: 172.60.0.0/16
scheduler: {}
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: "ipvs"
EOF

#在210上执行初始化集群
kubeadm init --config=init.yaml

执行完之后保存一下提示的信息:

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:

  kubeadm join 192.168.10.200:8443 --token abcdef.0123456789abcdef \
    --discovery-token-ca-cert-hash sha256:4f542d1d54cbbf2961bed56fac7fe8a195ffef5f33f2ae699908ab0379d7f568 \
    --control-plane

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.10.200:8443 --token abcdef.0123456789abcdef \
    --discovery-token-ca-cert-hash sha256:4f542d1d54cbbf2961bed56fac7fe8a195ffef5f33f2ae699908ab0379d7f568

在210机器执行:

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

14.在210上执行将相关证书文件复制到211、212

ssh 192.168.10.211 "mkdir -p /etc/kubernetes/pki/etcd"
ssh 192.168.10.212 "mkdir -p /etc/kubernetes/pki/etcd"
scp -r /etc/kubernetes/admin.conf 192.168.10.211:/etc/kubernetes/admin.conf
scp -r /etc/kubernetes/admin.conf 192.168.10.212:/etc/kubernetes/admin.conf
scp -r /etc/kubernetes/pki/{ca.*,sa.*,front*}  192.168.10.211:/etc/kubernetes/pki/
scp -r /etc/kubernetes/pki/{ca.*,sa.*,front*}  192.168.10.212:/etc/kubernetes/pki/
scp -r /etc/kubernetes/pki/etcd/ca.*  192.168.10.211:/etc/kubernetes/pki/etcd/ 
scp -r /etc/kubernetes/pki/etcd/ca.*  192.168.10.212:/etc/kubernetes/pki/etcd/

15.在211、212机器上执行,下面这段就是在初始化集群时生成的提示，211，212完成master部署

 kubeadm join 192.168.10.200:8443 --token abcdef.0123456789abcdef \
    --discovery-token-ca-cert-hash sha256:4f542d1d54cbbf2961bed56fac7fe8a195ffef5f33f2ae699908ab0379d7f568 \
    --control-plane
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

16.在213机器上执行，以加入节点

kubeadm join 192.168.10.200:8443 --token abcdef.0123456789abcdef \
    --discovery-token-ca-cert-hash sha256:4f542d1d54cbbf2961bed56fac7fe8a195ffef5f33f2ae699908ab0379d7f568

17.安装网络，我们这里使用calico，注意这里的网段需要对应初始网络配置文件中的podSubnet

curl -s https://docs.projectcalico.org/v3.7/manifests/calico.yaml -O
sed 's#192.168.0.0/16#172.60.0.0/16#g' calico.yaml |kubectl apply -f -

如果需要使用flannel,则

curl -s https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml -O
sed 's#0.244.0.0/16#172.60.0.0/16#g' kube-flannel.yml|kubectl apply -f -

18.查看节点

[root@node210 ~]# kubectl get nodes
NAME      STATUS   ROLES    AGE    VERSION
node210   Ready    master   3h7m   v1.15.1
node211   Ready    master   175m   v1.15.1
node212   Ready    master   176m   v1.15.1
node213   Ready       129m   v1.15.1

19.测试服务

kubectl create deployment nginx --image=nginx
kubectl expose deployment nginx --port=80 --type=NodePort
[root@node210 ~]# kubectl get svc
NAME          TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
nginx       ClusterIP   10.253.103.72            80:30230/TCP   151m
kubernetes    ClusterIP   10.253.0.1               443/TCP    3h9m

curl 192.168.10.210:90230如果正常即可

20.安装kubernetes-dashboard

wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml
sed  's#k8s.gcr.io#gcrxio#g' kubernetes-dashboard.yaml  |kubectl apply -f -
cat < dashboard-admin.yaml
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: admin
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io
subjects:
- kind: ServiceAccount
  name: admin
  namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin
  namespace: kube-system
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
EOF
kubectl apply -f dashboard-admin.yaml

#在210上执行添加NAT

echo "iptables -t nat -A POSTROUTING  -d 10.253.0.0/16 -j MASQUERADE">>/etc/rc.local
chmod +x /etc/rc.local
iptables -t nat -A POSTROUTING  -d 10.253.0.0/16 -j MASQUERADE

#查看SVC IP

[root@node210 ~]# kubectl get svc -nkube-system
NAME                   TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                  AGE
kube-dns               ClusterIP   10.253.0.10              53/UDP,53/TCP,9153/TCP   3h23m
kubernetes-dashboard   ClusterIP   10.253.165.188           443/TCP                  29s

#查看secret

kubectl describe secret/$(kubectl get secret -nkube-system|grep admin-token|awk '{print $1}') -nkube-system

#在本地机器添加静态路由

route add 10.253.0.0 mask 255.255.0.0 192.168.10.210 -p

#查看secret

kubectl describe secret/$(kubectl get secret -nkube-system|grep admin-token|awk '{print $1}') -nkube-system

kubeadm搭建高可用kubernetes 1.15.1

21.检查ETCD服务

docker exec -it $(docker ps |grep etcd_etcd|awk '{print $1}') sh
etcdctl --endpoints=https://192.168.10.212:2379 --ca-file=/etc/kubernetes/pki/etcd/ca.crt --cert-file=/etc/kubernetes/pki/etcd/server.crt --key-file=/etc/kubernetes/pki/etcd/server.key member list
etcdctl --endpoints=https://192.168.10.212:2379 --ca-file=/etc/kubernetes/pki/etcd/ca.crt --cert-file=/etc/kubernetes/pki/etcd/server.crt --key-file=/etc/kubernetes/pki/etcd/server.key cluster-health

22.如果配置出错如何重置集群呢?

kubeadm reset
ipvsadm --clear
rm -rf /etc/kubernetes/
service kubelet stop
docker stop $(docker ps -a |awk '{print $1}')
docker rm $(docker ps -a -q)

23.其他问题
集群跑起来后，发现210、211、212上无法跑容器，那是因为在初始集群参数的时候设置了污点，如果要去除污点

#以下是将211、212取消污点
kubectl taint nodes node211 node-role.kubernetes.io/master-
kubectl taint nodes node212 node-role.kubernetes.io/master-

新闻名称：kubeadm搭建高可用kubernetes1.15.1
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