Install Kubernetes 1.5.1 HA with kubeadm

Reading time ~9 minutes

ENV

Node IP

Node IP
s7kuberma01 10.1.51.31
s7kuberma02 10.1.51.32
s7kuberma03 10.1.51.33
s7kubersla01 10.1.51.34
s7kubersla02 10.1.51.35

vi /etc/hosts

10.1.51.31 s7kuberma01

10.1.51.32 s7kuberma02

10.1.51.33 s7kuberma03

10.1.51.34 s7kubersla01

10.1.51.35 s7kubersla02

architecture looks like this

Master Nodes

install etcd cluster in the 3 master nodes

yum install -y etcd

Configuration

vi /etc/etcd/etcd.conf

s7kuberma01 etcd

# [member]
ETCD_NAME=s7kuberma01
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
#ETCD_WAL_DIR=""
#ETCD_SNAPSHOT_COUNT="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
ETCD_LISTEN_PEER_URLS="http://10.1.51.31:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.1.51.31:2379,http://localhost:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.1.51.31:2380"
# if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
ETCD_INITIAL_CLUSTER="s7kuberma01=http://10.1.51.31:2380,s7kuberma02=http://10.1.51.32:2380,s7kuberma03=http://10.1.51.33:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://10.1.51.31:2379"

s7kuberma02 etcd

# [member]
ETCD_NAME=s7kuberma02
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
#ETCD_WAL_DIR=""
#ETCD_SNAPSHOT_COUNT="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
ETCD_LISTEN_PEER_URLS="http://10.1.51.32:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.1.51.32:2379,http://localhost:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.1.51.32:2380"
# if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
ETCD_INITIAL_CLUSTER="s7kuberma01=http://10.1.51.31:2380,s7kuberma02=http://10.1.51.32:2380,s7kuberma03=http://10.1.51.33:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://10.1.51.32:2379"

s7kuberma03 etcd

# [member]
ETCD_NAME=s7kuberma03
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
#ETCD_WAL_DIR=""
#ETCD_SNAPSHOT_COUNT="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
ETCD_LISTEN_PEER_URLS="http://10.1.51.33:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.1.51.33:2379,http://localhost:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.1.51.33:2380"
# if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
ETCD_INITIAL_CLUSTER="s7kuberma01=http://10.1.51.31:2380,s7kuberma02=http://10.1.51.32:2380,s7kuberma03=http://10.1.51.33:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://10.1.51.33:2379"

Enable and start etcd cluster

systemctl enable etcd;systemctl start etcd

Check etcd cluster health

etcdctl cluster-health
member 605710dd5e542748 is healthy: got healthy result from http://10.1.51.33:2379
member 73eb2e8e208fa18f is healthy: got healthy result from http://10.1.51.32:2379
member b7760aa41c6d87b3 is healthy: got healthy result from http://10.1.51.31:2379
cluster is healthy

now we have an externel etcd cluster “–external-etcd-endpoints=http://10.1.51.31:2379,http://10.1.51.32:2379,http://10.1.51.33:2379” for kubernetes

Install Kubeadm on the s7kuberma01

repo

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://yum.kubernetes.io/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg
       https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF

selinux

setenforce 0

install the packages and enable the services

yum install -y docker kubelet kubeadm kubectl kubernetes-cni
systemctl enable docker && systemctl start docker
systemctl enable kubelet && systemctl start kubelet

VIP

now we prepare to init our kubernetes with the kubeadm tools

but first, for we’re trying to deploy an HA env, we have to use the vip for the HA masters which is “10.1.51.30”, we will achieve this later with “Keepalived”, for right now , let’s just add it in the s7kuberma01.

ip addr add 10.1.51.30/25 dev ens160

and check the IP addresses

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0c:29:4d:0a:87 brd ff:ff:ff:ff:ff:ff
    inet 10.1.51.31/25 brd 10.1.51.127 scope global ens160
       valid_lft forever preferred_lft forever
    inet 10.1.51.30/25 scope global secondary ens160
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe4d:a87/64 scope link
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether 02:42:c3:25:5c:ad brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

you can see ,now we have both the “10.1.51.30” and “10.1.51.31” on the nic card “ens160” now

Kubeadm init

kubeadm init --api-advertise-addresses=10.1.51.30 --external-etcd-endpoints=http://10.1.51.31:2379,http://10.1.51.32:2379,http://10.1.51.33:2379 --pod-network-cidr 10.244.0.0/16

3 parameters have been used here

  1. API server pionted to the VIP which is 10.1.51.30
  2. use the external etcd cluster
  3. for we will install network addon flannel later , have to set the pod network as “10.244.0.0/16”

If everthing runs well, we should see output like this

Your Kubernetes master has initialized successfully!

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

You can now join any number of machines by running the following on each node:

kubeadm join --token=2dd145.8c687822f02702f1 10.1.51.30

Add two more Master nodes

install Packages

install kubelet kubeadmin in the s7kuberma02 s7kuberma03 , but dont start the services, use the same repo

yum install -y docker kubelet kubeadm kubectl kubernetes-cni

copy /etc/kubernetes from s7kuberma01 to 02 and 03 and start the kubelet

scp -r 10.1.51.31:/etc/kubernetes/* /etc/kubernetes/

start docker and kubelet on s7kuberma02 03

systemctl enable docker && systemctl start docker
systemctl enable kubelet && systemctl start kubelet

Deply the dns addons on all the masters

For deploy/kube-dns replicas only =1 ,so we need change 1 to 3 to achieve high availability

kubectl scale deploy/kube-dns  --replicas=3 -n kube-system

install network addons

Download kube-flannel.yml from https://github.com/coreos/flannel/blob/master/Documentation/kube-flannel.yml

It should look like below:

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-system
  labels:
    tier: node
    app: flannel
data:
  cni-conf.json: |
    {
      "name": "cbr0",
      "type": "flannel",
      "delegate": {
        "isDefaultGateway": true
      }
    }
  net-conf.json: |
    {
      "Network": "10.244.0.0/16",
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kube-flannel-ds
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      hostNetwork: true
      nodeSelector:
        beta.kubernetes.io/arch: amd64
      containers:
      - name: kube-flannel
        image: quay.io/coreos/flannel-git:v0.6.1-62-g6d631ba-amd64
        command: [ "/opt/bin/flanneld", "--ip-masq", "--kube-subnet-mgr" ]
        securityContext:
          privileged: true
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      - name: install-cni
        image: quay.io/coreos/flannel-git:v0.6.1-62-g6d631ba-amd64
        command: [ "/bin/sh", "-c", "set -e -x; cp -f /etc/kube-flannel/cni-conf.json /etc/cni/net.d/10-flannel.conf; while true; do sleep 3600; done" ]
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg

kubectl apply -f kube-flannel.yml

extend kube-discovery replicas to 3

kubectl scale deploy/kube-discovery --replicas=3 -n kube-system

lable master nodes

kubectl label node s7kuberma02.buyabs.corp kubeadm.alpha.kubernetes.io/role=master
kubectl label node s7kuberma03.buyabs.corp kubeadm.alpha.kubernetes.io/role=master

let’s check the kube-system pod to see if all the compoment runs well

[root@s7kuberma01 ~]# kubectl get pods -n kube-system
dummy-2088944543-481qm                            1/1       Running   0          27m
kube-apiserver-s7kuberma01.buyabs.corp            1/1       Running   0          28m
kube-apiserver-s7kuberma02.buyabs.corp            1/1       Running   0          16m
kube-apiserver-s7kuberma03.buyabs.corp            1/1       Running   0          17m
kube-controller-manager-s7kuberma01.buyabs.corp   1/1       Running   0          28m
kube-controller-manager-s7kuberma02.buyabs.corp   1/1       Running   0          16m
kube-controller-manager-s7kuberma03.buyabs.corp   1/1       Running   0          17m
kube-discovery-1769846148-48z5n                   1/1       Running   0          27m
kube-discovery-1769846148-7ww6t                   1/1       Running   0          6m
kube-discovery-1769846148-z9c9w                   1/1       Running   0          6m
kube-dns-2924299975-3dlrn                         4/4       Running   0          16m
kube-dns-2924299975-5927t                         4/4       Running   0          16m
kube-dns-2924299975-cxgqf                         4/4       Running   0          27m
kube-flannel-ds-7ms01                             2/2       Running   0          12m
kube-flannel-ds-87cf8                             2/2       Running   0          12m
kube-flannel-ds-sqs8j                             2/2       Running   0          12m
kube-proxy-73c5r                                  1/1       Running   0          17m
kube-proxy-p52m2                                  1/1       Running   0          27m
kube-proxy-tfgrc                                  1/1       Running   0          17m
kube-scheduler-s7kuberma01.buyabs.corp            1/1       Running   0          27m
kube-scheduler-s7kuberma02.buyabs.corp            1/1       Running   0          16m
kube-scheduler-s7kuberma03.buyabs.corp            1/1       Running   0          17m

looks good to me

Keepalived

but now the VIP is only on the s7kuberma01, so we need install keepalived in the 3 master nodes to make sure one master down the others can handle the jobs.

Install Keepalived in all 3 master nodes

vi /etc/keepalived/keepalived.conf

s7kuberma01 keepalived configuration

vrrp_script CheckK8sMaster {
    script "curl -k https://10.1.51.31:6443"
    interval 3
    timeout 9
    fall 2
    rise 2
}

vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id 61
    priority 115
    advert_int 1
    unicast_src_ip 10.1.51.31
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1234567890
    }
    unicast_peer {
        #10.1.51.31
        10.1.51.32
        10.1.51.33
    }
    virtual_ipaddress {
        10.1.51.30/25
    }
    track_script {
        CheckK8sMaster
    }

}

s7kuberma02 keepalived configuration

vrrp_script CheckK8sMaster {
    script "curl -k https://10.1.51.32:6443"
    interval 3
    timeout 9
    fall 2
    rise 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 61
    priority 114
    advert_int 1
    unicast_src_ip 10.1.51.32
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1234567890
    }
    unicast_peer {
        10.1.51.31
        #10.1.51.32
        10.1.51.33
    }
    virtual_ipaddress {
        10.1.51.30/25
    }
    track_script {
        CheckK8sMaster
    }

}

s7kuberma03 keepalived configuration

vrrp_script CheckK8sMaster {
    script "curl -k https://10.1.51.33:6443"
    interval 3
    timeout 9
    fall 2
    rise 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 61
    priority 113
    advert_int 1
    unicast_src_ip 10.1.51.33
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1234567890
    }
    unicast_peer {
        10.1.51.31
        10.1.51.32
        #10.1.51.33
    }
    virtual_ipaddress {
        10.1.51.30/25
    }
    track_script {
        CheckK8sMaster
    }

}
  1. “vrrp_script CheckK8sMaster” “curl -k https://10.1.51.31:6443” to check if the local server kuber-apiserver works
  2. s7kuberma01 “state MASTER” and the others two “state BACKUP”
  3. “priority 115” and decrease in 02,03
  4. change the related ip addresses

start keepalived and check the service status

systemctl enable keepalived;systemctl restart keepalived

check ip address

[root@s7kuberma01 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0c:29:4d:0a:87 brd ff:ff:ff:ff:ff:ff
    inet 10.1.51.31/25 brd 10.1.51.127 scope global ens160
       valid_lft forever preferred_lft forever
    inet 10.1.51.30/25 scope global secondary ens160
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe4d:a87/64 scope link
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether 02:42:c3:25:5c:ad brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever
4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN
    link/ether d6:f2:0f:3c:14:a1 brd ff:ff:ff:ff:ff:ff
    inet 10.244.0.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
    inet6 fe80::d4f2:fff:fe3c:14a1/64 scope link
       valid_lft forever preferred_lft forever
5: cni0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UP
    link/ether 0a:58:0a:f4:00:01 brd ff:ff:ff:ff:ff:ff
    inet 10.244.0.1/24 scope global cni0
       valid_lft forever preferred_lft forever
    inet6 fe80::e4c5:bdff:fe59:b90d/64 scope link
       valid_lft forever preferred_lft forever
6: vethc7ea64c1@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue master cni0 state UP
    link/ether e6:c5:bd:59:b9:0d brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet6 fe80::e4c5:bdff:fe59:b90d/64 scope link
       valid_lft forever preferred_lft foreve

check the kubelet status

[root@s7kuberma01 ~]# systemctl status kubelet
 kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since Fri 2017-01-13 07:34:03 PST; 2h 0min ago
     Docs: http://kubernetes.io/docs/
 Main PID: 2333 (kubelet)
   CGroup: /system.slice/kubelet.service
           ├─2333 /usr/bin/kubelet --kubeconfig=/etc/kubernetes/kubelet.conf --require-kubeconfig=true --pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true --network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin --cluster-dns=10...
           └─2385 journalctl -k -f

Jan 13 09:33:15 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:33:15.828445    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/e7f95c50-d9a5-11e6-80da-000c294d0a87-default-token-x1c6v" (spec.Name: "default-token-x1c6v") p...
Jan 13 09:33:22 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:33:22.853280    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/configmap/148c9948-d9a8-11e6-80da-000c294d0a87-flannel-cfg" (spec.Name: "flannel-c...0da-000c294d0a87").
Jan 13 09:33:22 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:33:22.853334    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/148c9948-d9a8-11e6-80da-000c294d0a87-default-token-x1c6v" (spec.Name: "default-token-x1c6v") p...
Jan 13 09:33:41 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:33:41.824006    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/e80166d2-d9a5-11e6-80da-000c294d0a87-default-token-x1c6v" (spec.Name: "default-token-x1c6v") p...
Jan 13 09:34:27 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:34:27.892885    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/d9f40ad4-d9a5-11e6-80da-000c294d0a87-default-token-x1c6v" (spec.Name: "default-token-x1c6v") p...
Jan 13 09:34:34 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:34:34.818039    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/db71de39-d9a5-11e6-80da-000c294d0a87-clusterinfo" (spec.Name: "clusterinfo"...0da-000c294d0a87").
Jan 13 09:34:34 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:34:34.818046    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/db71de39-d9a5-11e6-80da-000c294d0a87-default-token-x1c6v" (spec.Name: "default-token-x1c6v) p...
Jan 13 09:34:38 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:34:38.832263    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/configmap/148c9948-d9a8-11e6-80da-000c294d0a87-flannel-cfg" (spec.Name: "flannel-c...0da-000c294d0a87").
Jan 13 09:34:38 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:34:38.832812    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/e7f95c50-d9a5-11e6-80da-000c294d0a87-default-token-x1c6v" (spec.Name: "default-token-x1c6v") p...
Jan 13 09:34:38 s7kuberma01.buyabs.corp kubelet[2333]: I0113 09:34:38.832895    2333 operation_executor.go:917] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/148c9948-d9a8-11e6-80da-000c294d0a87-default-token-x1c6v" (spec.Name: "default-token-x1c6v") p...
Hint: Some lines were ellipsized, use -l to show in full.

Add slave nodes

Run kubeadm join on the s7kubema02 and s7kubema03

[root@s7kubersla01 ~]# kubeadm join --token=2dd145.8c687822f02702f1 10.1.51.30
[kubeadm] WARNING: kubeadm is in alpha, please do not use it for production clusters.
[preflight] Running pre-flight checks
[tokens] Validating provided token
[discovery] Created cluster info discovery client, requesting info from "http://10.1.51.30:9898/cluster-info/v1/?token-id=2dd145"
[discovery] Cluster info object received, verifying signature using given token
[discovery] Cluster info signature and contents are valid, will use API endpoints [https://10.1.51.30:6443]
[bootstrap] Trying to connect to endpoint https://10.1.51.30:6443
[bootstrap] Detected server version: v1.5.2
[bootstrap] Successfully established connection with endpoint "https://10.1.51.30:6443"
[csr] Created API client to obtain unique certificate for this node, generating keys and certificate signing request
[csr] Received signed certificate from the API server:
Issuer: CN=kubernetes | Subject: CN=system:node:s7kubersla01.buyabs.corp | CA: false
Not before: 2017-01-13 17:41:00 +0000 UTC Not After: 2018-01-13 17:41:00 +0000 UTC
[csr] Generating kubelet configuration
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"

Node join complete:
* Certificate signing request sent to master and response
  received.
* Kubelet informed of new secure connection details.

Run 'kubectl get nodes' on the master to see this machine join.

check the nodes

[root@s7kuberma01 ~]# kubectl get nodes
NAME                       STATUS         AGE
s7kuberma01.buyabs.corp    Ready,master   2h
s7kuberma02.buyabs.corp    Ready,master   2h
s7kuberma03.buyabs.corp    Ready,master   2h
s7kubersla01.buyabs.corp   Ready          2m
s7kubersla02.buyabs.corp   Ready          5s

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