Kubernetes : Kubeadm : Configure Worker Node2018/10/22 |
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Install Kubeadm to Configure Multi Nodes Kubernetes Cluster.
On this example, Configure This example is based on the emvironment like follows.
For System requirements, each Node has uniq Hostname, MAC address, Product_uuid.
MAC address and Product_uuid are generally already uniq one if you installed OS on phisical machine or virtual machine with common procedure. You can see Product_uuid with the command [dmidecode -s system-uuid].
-----------+---------------------------+--------------------------+------------
| | |
eth0|10.0.0.30 eth0|10.0.0.51 eth0|10.0.0.52
+----------+-----------+ +-----------+----------+ +-----------+----------+
| [ dlp.srv.world ] | | [ node01.srv.world ] | | [ node02.srv.world ] |
| Master Node | | Worker Node | | Worker Node |
+----------------------+ +----------------------+ +----------------------+
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Configure Worker Node on this section.
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| [1] | |
| [2] | Join in Kubernetes Cluster which is initialized on Master Node. The command for joining is just the one [kubeadm join ***] which was shown on the bottom of the results on initial setup of Cluster. |
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root@node01:~# kubeadm join 10.0.0.30:6443 --token nvr822.tjn09e85qw3a3vuz --discovery-token-ca-cert-hash sha256:866f645d9ec0da07f778b3c4abc4427e9967845d71add3252fbd691b86c0a9a7
[preflight] running pre-flight checks
[WARNING RequiredIPVSKernelModulesAvailable]: the IPVS proxier will not be used, because the following required kernel modules are not loaded: [ip_vs ip_vs_rr ip_vs_wrr ip_vs_sh] or no builtin kernel ipvs support: map[ip_vs:{} ip_vs_rr:{} ip_vs_wrr:{} ip_vs_sh:{} nf_conntrack_ipv4:{}]
you can solve this problem with following methods:
1. Run 'modprobe -- ' to load missing kernel modules;
2. Provide the missing builtin kernel ipvs support
[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 17.12.1-ce. Latest validated version: 18.06
[discovery] Trying to connect to API Server "10.0.0.30:6443"
[discovery] Created cluster-info discovery client, requesting info from "https://10.0.0.30:6443"
[discovery] Requesting info from "https://10.0.0.30:6443" again to validate TLS against the pinned public key
[discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server "10.0.0.30:6443"
[discovery] Successfully established connection with API Server "10.0.0.30:6443"
[kubelet] Downloading configuration for the kubelet from the "kubelet-config-1.12" ConfigMap in the kube-system namespace
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[preflight] Activating the kubelet service
[tlsbootstrap] Waiting for the kubelet to perform the TLS Bootstrap...
[patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to the Node API object "node01.srv.world" as an annotation
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the master to see this node join the cluster.
# OK if shown [Successfully established connection ***] |
| [3] | Verify Status on Master Node. It's Ok if all STATUS are Ready. |
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root@dlp:~# kubectl get nodes NAME STATUS ROLES AGE VERSION dlp.srv.world Ready master 12m v1.12.1 node01.srv.world Ready <none> 6m59s v1.12.1 node02.srv.world Ready <none> 2m20s v1.12.1 |
| [4] | Verify working to deploy test Pods. |
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root@dlp:~# kubectl create deployment test-nginx --image=nginx deployment.apps "test-nginx" created root@dlp:~# kubectl scale deployment test-nginx --replicas=3 deployment.extensions/test-nginx scaled root@dlp:~# kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE test-nginx-677ccfd879-7pxdn 1/1 Running 0 14s 10.244.2.2 node02.srv.world <none> test-nginx-677ccfd879-hpvv5 1/1 Running 0 33s 10.244.1.2 node01.srv.world <none> test-nginx-677ccfd879-wjj7k 1/1 Running 0 14s 10.244.1.3 node01.srv.world <none>root@dlp:~# kubectl expose deployment test-nginx --port 80 service "test-nginx" exposed root@dlp:~# kubectl describe service test-nginx Name: test-nginx Namespace: default Labels: app=test-nginx Annotations: <none> Selector: app=test-nginx Type: ClusterIP IP: 10.106.41.54 Port: <unset> 80/TCP TargetPort: 80/TCP Endpoints: 10.244.1.2:80,10.244.1.3:80,10.244.2.2:80 Session Affinity: None Events: <none>root@dlp:~# curl 10.106.41.54 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> ..... ..... <p><em>Thank you for using nginx.</em></p> </body> </html> |
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