Kubernetes (k8s) 集群部署（四）完整版

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第四步

Kubernetes Node

Node 是主要执行容器实例的节点，可视为工作节点。在这步骤我们会下载 Kubernetes binary 文件，并创建 node 的 certificate 来提供给节点注册认证用。Kubernetes 使用Node Authorizer来提供Authorization mode，这种授权模式会替 Kubelet 生成 API request。

在开始前，我们先在master1将需要的 ca 与 cert 复制到 Node 节点上：

$ cd ~/kubernetes/server/bin
$ scp kubelet kube-proxy 192.168.184.29:/usr/local/bin/
$ scp kubelet kube-proxy 192.168.184.30:/usr/local/bin/
$ cd /etc/etcd/ssl

创建角色绑定

$ kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap

创建 kubelet bootstrap.kubeconfig 文件设置集群参数

$ kubectl config set-cluster kubernetes --certificate-authority=/etc/etcd/ssl/ca.pem --embed-certs=true --server=https://192.168.184.28:6443 --kubeconfig=bootstrap.kubeconfig

设置客户端认证参数,token值为之前生成的

$ cat /etc/etcd/ssl/bootstrap-token.csv
$ kubectl config set-credentials kubelet-bootstrap --token=05c645cec943aef73c8b1f54464120c0 --kubeconfig=bootstrap.kubeconfig // --token 之前存的token

设置上下文参数

$ kubectl config set-context default --cluster=kubernetes --user=kubelet-bootstrap --kubeconfig=bootstrap.kubeconfig

选择默认上下文并向node节点分发在master端生成的bootstrap.kubeconfig文件

$ kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
$ mv bootstrap.kubeconfig /etc/etcd/cfg/
$ scp /etc/etcd/cfg/bootstrap.kubeconfig 192.168.184.29:/etc/etcd/cfg/
$ scp /etc/etcd/cfg/bootstrap.kubeconfig 192.168.184.30:/etc/etcd/cfg/

部署kubelet(work01和work02节点操作)

设置CNI支持

$ mkdir -p /etc/etcd/cni/net.d //192.168.184.29
$ mkdir -p /etc/etcd/cni/net.d //192.168.184.30
$ cat > /etc/etcd/cni/net.d/10-default.conf <<EOF
{
        "name": "flannel",
        "type": "flannel",
        "delegate": {
            "bridge": "docker0",
            "isDefaultGateway": true,
            "mtu": 1400
        }
}
EOF

$ scp -r /etc/etcd/cni/net.d/10-default.conf 192.168.184.26:/etc/etcd/cni/net.d/10-default.conf

创建kubelet目录和.创建kubelet服务配置

$ mkdir /var/lib/kubelet //192.168.184.29
$ mkdir /var/lib/kubelet //192.168.184.30
$ cat > /usr/lib/systemd/system/kubelet.service <<EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=/var/lib/kubelet
ExecStart=/usr/local/bin/kubelet \
  --address=192.168.184.29 \
  --hostname-override=192.168.184.29 \
  --pod-infra-container-image=mirrorgooglecontainers/pause-amd64:3.0 \
  --experimental-bootstrap-kubeconfig=/etc/etcd/cfg/bootstrap.kubeconfig \
  --kubeconfig=/etc/etcd/cfg/kubelet.kubeconfig \
  --cert-dir=/etc/etcd/ssl \
  --network-plugin=cni \
  --cni-conf-dir=/etc/etcd/cni/net.d \
  --cni-bin-dir=/usr/local/bin/cni \
  --cluster-dns=10.1.0.2 \
  --cluster-domain=cluster.local. \
  --hairpin-mode hairpin-veth \
  --allow-privileged=true \
  --fail-swap-on=false \
  --logtostderr=true \
  --v=2 \
  --logtostderr=false \
  --log-dir=/etc/etcd/log
Restart=on-failure
RestartSec=5

EOF
$ scp -r  /usr/lib/systemd/system/kubelet.service 192.168.184.30: /usr/lib/systemd/system/kubelet.service

启动

$ systemctl daemon-reload
$ systemctl enable  kubelet.service &&  systemctl start kubelet.service
$ systemctl status  kubelet.service

查看csr请求注意是在master01上执行

$ kubectl get csr

Docker+Kubernetes (k8s) 集群部署（四）完整版

批准kubelet 的 TLS 证书请求

$ kubectl get csr|grep 'Pending' | awk 'NR>0{print $1}'| xargs kubectl certificate approve

Docker+Kubernetes (k8s) 集群部署（四）完整版

执行完毕后，查看节点状态如果是Ready的状态就说明一切正常

$　 kubectl get node

Docker+Kubernetes (k8s) 集群部署（四）完整版

部署Kubernetes Proxy (work01和work02节点操作)

配置kube-proxy使用LVS

$ yum install -y ipvsadm ipset conntrack

创建 kube-proxy 证书请求 (master01操作)

$ cd /etc/etcd/ssl_tmp
$  cat > kube-proxy-csr.json <<EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}

EOF

生成证书，并分发至节点.

$ cfssl gencert -ca=/etc/etcd/ssl/ca.pem -ca-key=/etc/etcd/ssl/ca-key.pem -config=/etc/etcd/ssl/ca-config.json -profile=kubernetes  kube-proxy-csr.json | cfssljson -bare kube-proxy
$ cp kube-proxy*.pem ../ssl/
$ scp kube-proxy*.pem 192.168.184.29:/etc/etcd/ssl/
$ scp kube-proxy*.pem 192.168.184.30:/etc/etcd/ssl/

创建kube-proxy配置文件

$ kubectl config set-cluster kubernetes --certificate-authority=/etc/etcd/ssl/ca.pem --embed-certs=true --server=https://192.168.184.28:6443 --kubeconfig=kube-proxy.kubeconfig
$ kubectl config set-credentials kube-proxy --client-certificate=/etc/etcd/ssl/kube-proxy.pem --client-key=/etc/etcd/ssl/kube-proxy-key.pem --embed-certs=true --kubeconfig=kube-proxy.kubeconfig
$ kubectl config set-context default --cluster=kubernetes --user=kube-proxy --kubeconfig=kube-proxy.kubeconfig
$ kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
$ scp kube-proxy.kubeconfig 192.168.184.29:/etc/etcd/cfg/
$ scp kube-proxy.kubeconfig 192.168.184.30:/etc/etcd/cfg/
$ mv kube-proxy.kubeconfig /etc/etcd/cfg/

创建kube-proxy服务配置 (work01和work02节点操作)

$ mkdir /var/lib/kube-proxy //192.168.184.29 和 192.168.184.30
$ cat > /usr/lib/systemd/system/kube-proxy.service <<EOF

[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target

[Service]
WorkingDirectory=/var/lib/kube-proxy
ExecStart=/usr/local/bin/kube-proxy \
  --bind-address=192.168.184.29 \
  --hostname-override=192.168.184.29 \
  --kubeconfig=/etc/etcd/cfg/kube-proxy.kubeconfig \
--masquerade-all \
  --feature-gates=SupportIPVSProxyMode=true \
  --proxy-mode=ipvs \
  --ipvs-min-sync-period=5s \
  --ipvs-sync-period=5s \
  --ipvs-scheduler=rr \
  --logtostderr=true \
  --v=2 \
  --logtostderr=false \
  --log-dir=/etc/etcd/log

Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

EOF

$ //注意修改ip
$ systemctl enable kube-proxy && systemctl start kube-proxy
$ systemctl status kube-proxy
$ ipvsadm -L -n

检查LVS状态

$ ipvsadm -L -n

Docker+Kubernetes (k8s) 集群部署（四）完整版

检查状态：(master01操作)

$ kubectl get nodes

Docker+Kubernetes (k8s) 集群部署（四）完整版

-

Flannel网络部署

Flannel生成证书

$ cd /etc/etcd/ssl_tmp/
$ cat > /etc/etcd/ssl_tmp/flanneld-csr.json <<EOF
{
"CN": "flanneld",
"hosts": [],
"key": {
  "algo": "rsa",
  "size": 2048
},
"names": [
  {
    "C": "CN",
    "ST": "BeiJing",
    "L": "BeiJing",
    "O": "k8s",
    "OU": "System"
  }
]
}
EOF

生成证书和分发证书

$ cfssl gencert -ca=/etc/etcd/ssl/ca.pem  -ca-key=/etc/etcd/ssl/ca-key.pem -config=/etc/etcd/ssl/ca-config.json -profile=kubernetes flanneld-csr.json | cfssljson -bare flanneld
$ cp flanneld*.pem /etc/etcd/ssl/
$ scp  /etc/etcd/ssl/flanneld*.pem 192.168.184.29:/etc/etcd/ssl/
$ scp  /etc/etcd/ssl/flanneld*.pem 192.168.184.30:/etc/etcd/ssl/

下载Flannel软件包

$ cd && wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
$ tar zxf flannel-v0.10.0-linux-amd64.tar.gz
$ cp flanneld mk-docker-opts.sh /usr/local/bin/
$ scp flanneld mk-docker-opts.sh 192.168.184.29:/usr/local/bin/
$ scp flanneld mk-docker-opts.sh 192.168.184.30:/usr/local/bin/

分发对应脚本到/usr/local/bin目录下

$ cd kubernetes/cluster/centos/node/bin/
$ cp remove-docker0.sh /usr/local/bin/
$ scp remove-docker0.sh 192.168.184.29:/usr/local/bin/
$ scp remove-docker0.sh 192.168.184.30:/usr/local/bin/

配置Flannel

$ cat > /etc/etcd/cfg/flannel  <<EOF
FLANNEL_ETCD="-etcd-endpoints=https://192.168.184.28:2379,https://192.168.184.29:2379,https://192.168.184.30:2379"
FLANNEL_ETCD_KEY="-etcd-prefix=/etc/etcd/network"
FLANNEL_ETCD_CAFILE="--etcd-cafile=/etc/etcd/ssl/ca.pem"
FLANNEL_ETCD_CERTFILE="--etcd-certfile=/etc/etcd/ssl/flanneld.pem"
FLANNEL_ETCD_KEYFILE="--etcd-keyfile=/etc/etcd/ssl/flanneld-key.pem"

EOF
$ scp /etc/etcd/cfg/flannel 192.168.184.29:/etc/etcd/cfg/
$ scp /etc/etcd/cfg/flannel 192.168.184.30:/etc/etcd/cfg/

设置Flannel系统服务

$ vim /usr/lib/systemd/system/flannel.service  
[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
Before=docker.service

[Service]
EnvironmentFile=-/etc/etcd/cfg/flannel
ExecStartPre=/usr/local/bin/remove-docker0.sh
ExecStart=/usr/local/bin/flanneld ${FLANNEL_ETCD} ${FLANNEL_ETCD_KEY} ${FLANNEL_ETCD_CAFILE} ${FLANNEL_ETCD_CERTFILE} ${FLANNEL_ETCD_KEYFILE}
ExecStartPost=/usr/local/bin/mk-docker-opts.sh -d /run/flannel/docker

Type=notify

[Install]
WantedBy=multi-user.target
RequiredBy=docker.service
$ scp /usr/lib/systemd/system/flannel.service 192.168.184.29:/usr/lib/systemd/system/
$ scp /usr/lib/systemd/system/flannel.service 192.168.184.30:/usr/lib/systemd/system/

在master节点创建Etcd的key

$ etcdctl --ca-file /etc/etcd/ssl/ca.pem --cert-file /etc/etcd/ssl/flanneld.pem --key-file /etc/etcd/ssl/flanneld-key.pem --no-sync -C  https://192.168.184.28:2379,https://192.168.184.29:2379,https://192.168.184.30:2379 set  /etc/etcd/network/config '{ "Network": "10.2.0.0/16","SubnetLen": 24, "Backend": { "Type": "vxlan", "VNI": 1 }}'

启动

$ systemctl daemon-reload
$ systemctl enable flannel && systemctl start flannel
$ systemctl status flannel

配置Docker使用Flannel

在Unit段中的After后面添加flannel.service参数，在Wants下面添加Requires=flannel.service.
[Service]段中Type后面添加EnvironmentFile=-/run/flannel/docker段，在ExecStart后面添加$DOCKER_OPTS参数.

 $ vim /usr/lib/systemd/system/docker.service 
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service flannel.service
Wants=network-online.target
Requires=flannel.service

[Service]
Type=notify
EnvironmentFile=-/run/flannel/docker
ExecStart=/usr/bin/dockerd $DOCKER_OPTS
...

将配置分发到另外两个节点中

$ rsync -av  /usr/lib/systemd/system/docker.service  192.168.184.29:/usr/lib/systemd/system/docker.service
$ rsync -av  /usr/lib/systemd/system/docker.service  192.168.184.30:/usr/lib/systemd/system/docker.service

192.168.184.28 ,192.168.184.29,192.168.184.30重启Docker服务

$ systemctl daemon-reload &&  systemctl restart docker

检查 flanneld 服务

$ journalctl  -u flanneld |grep 'Lease acquired'
$ ifconfig flannel.1

Kubernetes (k8s) 集群部署（四）完整版

至此flannel网络配置完成,k8s的集群也部署完成，下面我们来建立pod测试集群之间网络的连通性.创建第一个K8S应用,测试集群节点是否通信

创建一个测试用的nginx pod.

$ kubectl run test-nginx --image=nginx --replicas=3 --port=80

查看获取IP情况

$ kubectl get pod -o wide

Kubernetes (k8s) 集群部署（四）完整版

暴露服务，创建service.

$ kubectl expose deployment test-nginx --port=8080 --target-port=80 --external-ip=192.168.184.30

查看service明细。

$ kubectl get svc

Kubernetes (k8s) 集群部署（四）完整版

测试svc访问-就大功告成了

$ curl -I 192.168.184.30:8080

Kubernetes (k8s) 集群部署（四）完整版

kubectl常用命令使用

kubectl run 运行一个镜像

$ kubectl run sonarqube --image=192.168.184.28:5000/sonarqube:5.6.5 --replicas=1 --port=9000

Kubernetes (k8s) 集群部署（四）完整版

确认Deployment

$ kubectl get deployment

Kubernetes (k8s) 集群部署（四）完整版

确认pod

$ kubectl get pods

Kubernetes (k8s) 集群部署（四）完整版

删除pods

$  kubectl delete pods sonarqube-9969f57d5-d94fc

Kubernetes (k8s) 集群部署（四）完整版

删除deployment

$ kubectl delete deployment sonarqube

Kubernetes (k8s) 集群部署（四）完整版

Kubernetes Node Docker+Kubernetes (k8s) 集群部署（四）完整版 kubelet Flannel

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Kubernetes (k8s) 集群部署（四）完整版

第四步

Kubernetes Node

部署kubelet(work01和work02节点操作)

部署Kubernetes Proxy (work01和work02节点操作)

Flannel网络部署

至此flannel网络配置完成,k8s的集群也部署完成，下面我们来建立pod测试集群之间网络的连通性.创建第一个K8S应用,测试集群节点是否通信

kubectl常用命令使用

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Kubernetes (k8s) 集群部署（四） 完整版

第四步

Kubernetes Node

部署kubelet(work01和work02节点操作)

部署Kubernetes Proxy (work01和work02节点操作)

Flannel网络部署

至此flannel网络配置完成,k8s的集群也部署完成，下面我们来建立pod测试集群之间网络的连通性.创建第一个K8S应用,测试集群节点是否通信

kubectl常用命令使用

推荐文章：

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关于 LearnKu

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Kubernetes (k8s) 集群部署（四）完整版