[Kubernetes] CentOS 7.3 으로 Kubernetes Cluster 구성(노드 추가하기)-2/4

전편(http://bryan.wiki/281)에 이어서, 이번에는 기존 k8s 클러스터에 새로운 워커 노드를 추가하는 방법에 대해 알아 보자. 클러스터의 환경 구성은 전편과 동일하다.

새로운(3 번째) 노드의 준비

* Minion 3: CPU 1, Memory 1.2GB, IP 10.255.10.183

기존 노드와 동일/유사 스펙과 설정으로 구성해 나간다

추가 Minion 노드 시간동기화 설정

[root@kubenode3 ~]# yum -y install --enablerepo=virt7-docker-common-release kubernetes etcd flannel wget git

[root@kubenode3 ~]# yum update -y

[root@kubenode3 ~]# vi /etc/chrony.conf

...

server 10.255.10.180 iburst

local stratum 10

...

[root@kubenode3 ~]# systemctl enable chronyd

[root@kubenode3 ~]# systemctl start chronyd

[root@kubenode3 ~]# chronyc tracking

Reference ID    : 10.255.10.180 (10.255.10.180)

Stratum         : 4

Ref time (UTC)  : Sun Aug 13 10:03:29 2017

System time     : 0.000000011 seconds fast of NTP time

Last offset     : -0.000016258 seconds

RMS offset      : 0.001879302 seconds

Frequency       : 27.832 ppm fast

Residual freq   : -0.014 ppm

Skew            : 0.427 ppm

Root delay      : 0.009792 seconds

Root dispersion : 0.045111 seconds

Update interval : 64.6 seconds

Leap status     : Normal

[root@kubenode3 ~]# chronyc sources -v

210 Number of sources = 1

  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.

 / .- Source state '*' = current synced, '+' = combined , '-' = not combined,

| /   '?' = unreachable, 'x' = time may be in error, '~' = time too variable.

||                                                 .- xxxx [ yyyy ] +/- zzzz

||      Reachability register (octal) -.           |  xxxx = adjusted offset,

||      Log2(Polling interval) --.      |          |  yyyy = measured offset,

||                                \     |          |  zzzz = estimated error.

||                                 |    |           \

MS Name/IP address         Stratum Poll Reach LastRx Last sample

===============================================================================

^* 10.255.10.180                 3   6   377    17    +23us[  +47us] +/-   51ms

추가 Minion 노드 kubernetes  config/kubelet/flannel 설정

기존 노드로부터 설정파일 등을 복사하여 수정/반영한다

[root@kubenode3 ~]# mkdir k8s-files

[root@kubenode3 ~]# cd k8s-files/

[root@kubenode3k8s-files]# scp root@10.255.10.181:/etc/yum.repos.d/virt7-docker-common-release.repo /etc/yum.repos.d/

[root@kubenode3 k8s-files]# scp root@10.255.10.181:/etc/kubernetes/config /etc/kubernetes/config

[root@kubenode3 k8s-files]# scp root@10.255.10.181:/etc/kubernetes/kubelet .

[root@kubenode3 k8s-files]# vi kubelet

...

KUBELET_HOSTNAME="--hostname-override=10.255.10.183"

...

[root@kubenode3 k8s-files]# cp kubelet /etc/kubernetes/kubelet

[root@kubenode3 k8s-files]# scp root@10.255.10.181:/etc/sysconfig/flanneld /etc/sysconfig/flanneld

[root@kubenode3 k8s-files]# cd ~

[root@kubemaster ~]# scp root@10.255.10.181:~/kube-*.sh .

[root@kubemaster ~]# systemctl disable firewalld

[root@kubemaster ~]# systemctl stop firewalld

Kubernetes Master controller manager 설정

[root@kubemaster ~]# vi /etc/kubernetes/controller-manager

...

KUBELET_ADDRESSES="--machines=10.255.10.181, 10.255.10.182, 10.255.10.183"

...

[root@kubemaster ~]# systemctl restart kube-controller-manager

[root@kubemaster ~]# systemctl status kube-controller-manager

● kube-controller-manager.service - Kubernetes Controller Manager

   Loaded: loaded (/usr/lib/systemd/system/kube-controller-manager.service; enabled; vendor preset: disabled)

   Active: active (running) since 일 2017-08-13 16:02:14 KST; 11s ago

     Docs: https://github.com/GoogleCloudPlatform/kubernetes

 Main PID: 6221 (kube-controller)

   Memory: 24.2M

   CGroup: /system.slice/kube-controller-manager.service

           └─6221 /usr/bin/kube-controller-manager --logtostderr=true --v=0 --master=http://10.255.10.18...

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: E0813 16:02:15.243100    6221 actual_state...st

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: I0813 16:02:15.265929    6221 replication_...v4

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: I0813 16:02:15.266201    6221 replication_...20

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: I0813 16:02:15.274222    6221 nodecontroll...e:

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: W0813 16:02:15.274255    6221 nodecontroll...p.

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: W0813 16:02:15.274290    6221 nodecontroll...p.

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: I0813 16:02:15.274310    6221 nodecontroll...l.

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: I0813 16:02:15.274456    6221 event.go:217] ...

 8월 13 16:02:15 kubemaster kube-controller-manager[6221]: I0813 16:02:15.274478    6221 event.go:217] ...

 8월 13 16:02:25 kubemaster kube-controller-manager[6221]: I0813 16:02:25.203637    6221 garbagecolle...ge

Hint: Some lines were ellipsized, use -l to show in full.

추가 Minion 노드 kubernetes 컴포넌트 시작

[root@kubenode3 ~]# for SERVICES in flanneld docker kubelet kube-proxy ; do \

>    systemctl enable $SERVICES ; \

>done

Created symlink from /etc/systemd/system/multi-user.target.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service.

Created symlink from /etc/systemd/system/docker.service.requires/flanneld.service to /usr/lib/systemd/system/flanneld.service.

Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.

Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.

[root@kubenode3 ~]# ./kube-start-node.sh

--- Starting flanneld ---

Done

--- Starting docker ---

Done

--- Starting kubelet ---

Done

--- Starting kube-proxy ---

Done

[root@kubenode3 ~]# ./kube-check-node.sh 

--- docker ---

active

enabled

--- flanneld ---

active

enabled

--- kubelet ---

active

enabled

--- kube-proxy ---

active

enabled

Kubernetes Master 에서 클러스터 상태 확인

[root@kubemaster ~]# kubectl get nodes

NAME            STATUS    AGE

10.255.10.181   Ready     9d

10.255.10.182   Ready     9d

10.255.10.183   Ready     6m

- Barracuda -

[관련 글 목록]

[Technical/Cloud, 가상화, PaaS] - [Kubernetes] CentOS 7.3 으로 Kubernetes Cluster 구성(with Flannel)-1/4

[Technical/Cloud, 가상화, PaaS] - [Kubernetes] CentOS 7.3 으로 Kubernetes Cluster 구성(노드 추가하기)-2/4

[Technical/Cloud, 가상화, PaaS] - [Kubernetes] 1.7.3/1.7.4, kubeadm 으로 L3 네트워크 기반 Cluster 구성(with Calico CNI)-3/4

[Technical/Cloud, 가상화, PaaS] - [Kubernetes] Hyper-converged GlusterFs integration with Heketi -4/4

[Technical/Cloud, 가상화, PaaS] - [GlusterFS & Kubernetes] External Gluster PV with Heketi CLI/Rest API

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