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centos7.2 安裝k8s v1.11.0

Kyxy / 506人閱讀

前言
最近由于公司業務發展到了瓶頸,原有的技術架構已經逐漸無法滿足業務開發和測試的需求,出現了應用測試環境搭建復雜,有許多套(真的很多很多)應用環境,應用在持續集成/持續交付也遇到了很大的困難,經過討論研究決定對應用和微服務進行容器化,這就是我首次直面docker和k8s的契機(好吧,我是菜鳥)
Kubernetes 介紹

Kubernetes 是 Google 團隊發起的開源項目,它的目標是管理跨多個主機的容器,提供基本的部署,維護以及運用伸縮,主要實現語言為
Go 語言。
Kubernetes的特點:

易學:輕量級,簡單,容易理解

便攜:支持公有云,私有云,混合云,以及多種云平臺

可拓展:模塊化,可插拔,支持鉤子,可任意組合

自修復:自動重調度,自動重啟,自動復制

好吧,這是從別人ppt上拷下來的=。=
下面就正式開始部署我們自己的k8s吧

準備工作

注:以下操作都是在root權限下執行的

安裝docker-ce,這里使用docker-ce-17.09.0.c版本,安裝方法見之前的教程

安裝Kubeadm
安裝 Kubeadm 首先我們要配置好阿里云的國內源,執行如下命令:

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=0 
EOF

之后,執行以下命令來重建yum緩存:

yum -y install epel-releaseyum 
clean all 
yum makecache

接下來需要安裝指定版本的Kubeadm(這里要安裝指定版本,因為后續依賴的鏡像由于有墻無法拉取,這里我們只有指定版本的鏡像),注意:這里是安裝指定版本的Kubeadm,k8s的版本更新之快完全超出你的想象!

yum -y install kubelet-1.11.0-0
yum -y install kubeadm-1.11.0-0
yum -y install kubectl-1.11.0-0
yum -y install kubernetes-cni

執行命令啟動Kubeadm服務:

systemctl enable kubelet && systemctl start kubelet

配置 Kubeadm 所用到的鏡像
這里是重中之重,因為在國內的原因,無法訪問到 Google 的鏡像庫,所以我們需要執行以下腳本來從 Docker Hub 倉庫中獲取相同的鏡像,并且更改 TAG 讓其變成與 Google 拉去鏡像一致。
新建一個 Shell 腳本,填入以下代碼之后保存。

#docker.sh
#!/bin/bash
images=(kube-proxy-amd64:v1.11.0 kube-scheduler-amd64:v1.11.0 kube-controller-manager-amd64:v1.11.0 kube-apiserver-amd64:v1.11.0 etcd-amd64:3.2.18 coredns:1.1.3 pause-amd64:3.1 kubernetes-dashboard-amd64:v1.8.3 k8s-dns-sidecar-amd64:1.14.9 k8s-dns-kube-dns-amd64:1.14.9 k8s-dns-dnsmasq-nanny-amd64:1.14.9 ) 
for imageName in ${images[@]} ; do
docker pull keveon/$imageName
docker tag keveon/$imageName k8s.gcr.io/$imageName
docker rmi keveon/$imageName
done
# 個人新加的一句,V 1.11.0 必加
docker tag da86e6ba6ca1 k8s.gcr.io/pause:3.1

保存后使用chmod命令賦予腳本執行權限

chmod -R 777 ./docker.sh

執行腳本拉取鏡像

sh docker.sh
#這里就開始了漫長的拉取鏡像之路 

關閉swap

sudo swapoff -a
#要永久禁掉swap分區,打開如下文件注釋掉swap那一行 
# sudo vi /etc/stab

關閉selinux

# 臨時禁用selinux
# 永久關閉 修改/etc/sysconfig/selinux文件設置
sed -i "s/SELINUX=permissive/SELINUX=disabled/" /etc/sysconfig/selinux 
# 這里按回車,下面是第二條命令
setenforce 0

關閉防火墻

systemctl disable firewalld.service && systemctl stop firewalld.service

配置轉發參數

# 配置轉發相關參數,否則可能會出錯 
cat < /etc/sysctl.d/k8s.conf 
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
vm.swappiness=0
EOF 
# 這里按回車,下面是第二條命令 
sysctl --system

這里就完成了k8s集群搭建的準備工作,集群搭建的話以上操作結束后將操作完的系統制作成系統鏡像,方便集群搭建

正式安裝
以下的操作都只在主節點上進行:

正式開始安裝k8s
初始化鏡像,執行以下命令:

kubeadm init --kubernetes-version=v1.11.0 #這里是之前所安裝K8S的版本號 --pod-network-cidr=10.10.0.0/16  #這里填寫集群所在網段

之后的輸出會是這樣:

I0712 10:46:30.938979   13461 feature_gate.go:230] feature gates: &{map[]}
[init] using Kubernetes version: v1.11.0
[preflight] running pre-flight checks
I0712 10:46:30.961005   13461 kernel_validator.go:81] Validating kernel version
I0712 10:46:30.961061   13461 kernel_validator.go:96] Validating kernel config
    [WARNING SystemVerification]: docker version is greater than the most recently validated version. Docker version: 18.03.1-ce. Max validated version: 17.03
    [WARNING Hostname]: hostname "g2-apigateway" could not be reached
    [WARNING Hostname]: hostname "g2-apigateway" lookup g2-apigateway on 100.100.2.138:53: no such host
[preflight/images] Pulling images required for setting up a Kubernetes cluster
[preflight/images] This might take a minute or two, depending on the speed of your internet connection
[preflight/images] You can also perform this action in beforehand using "kubeadm config images pull"
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[preflight] Activating the kubelet service
[certificates] Generated ca certificate and key.
[certificates] Generated apiserver certificate and key.
[certificates] apiserver serving cert is signed for DNS names [g2-apigateway kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 172.16.8.62]
[certificates] Generated apiserver-kubelet-client certificate and key.
[certificates] Generated sa key and public key.
[certificates] Generated front-proxy-ca certificate and key.
[certificates] Generated front-proxy-client certificate and key.
[certificates] Generated etcd/ca certificate and key.
[certificates] Generated etcd/server certificate and key.
[certificates] etcd/server serving cert is signed for DNS names [g2-apigateway localhost] and IPs [127.0.0.1 ::1]
[certificates] Generated etcd/peer certificate and key.
[certificates] etcd/peer serving cert is signed for DNS names [g2-apigateway localhost] and IPs [172.16.8.62 127.0.0.1 ::1]
[certificates] Generated etcd/healthcheck-client certificate and key.
[certificates] Generated apiserver-etcd-client certificate and key.
[certificates] valid certificates and keys now exist in "/etc/kubernetes/pki"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
[controlplane] wrote Static Pod manifest for component kube-apiserver to "/etc/kubernetes/manifests/kube-apiserver.yaml"
[controlplane] wrote Static Pod manifest for component kube-controller-manager to "/etc/kubernetes/manifests/kube-controller-manager.yaml"
[controlplane] wrote Static Pod manifest for component kube-scheduler to "/etc/kubernetes/manifests/kube-scheduler.yaml"
[etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/manifests/etcd.yaml"
[init] waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests" 
[init] this might take a minute or longer if the control plane images have to be pulled
[apiclient] All control plane components are healthy after 41.001672 seconds
[uploadconfig] storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.11" in namespace kube-system with the configuration for the kubelets in the cluster
[markmaster] Marking the node g2-apigateway as master by adding the label "node-role.kubernetes.io/master="""
[markmaster] Marking the node g2-apigateway as master by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to the Node API object "g2-apigateway" as an annotation
[bootstraptoken] using token: o337m9.ceq32wg9g2gro7gx
[bootstraptoken] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstraptoken] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstraptoken] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstraptoken] creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy

Your Kubernetes master has initialized successfully!

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 machines by running the following on each node
as root:

kubeadm join 10.10.207.253:6443 --token t69z6h.lr2etdbg9mfx5r15 --discovery-token-ca-cert-hash sha256:90e3a748c0eb4cb7058f3d0ee8870ee5d746214ab0589b5e841fd5d68fec8f00

這里注意最后一行:

kubeadm join 10.10.207.253:6443 --token t69z6h.lr2etdbg9mfx5r15 --discovery-token-ca-cert-hash sha256:90e3a748c0eb4cb7058f3d0ee8870ee5d746214ab0589b5e841fd5d68fec8f00

證明集群主節點安裝成功,這里要記得保存這條命令,以便之后各個節點加入集群

配置kubetl認證信息

export KUBECONFIG=/etc/kubernetes/admin.conf 
# 如果你想持久化的話,直接執行以下命令【推薦】
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

安裝flanel網絡
依次執行以下命令:

mkdir -p /etc/cni/net.d/

cat < /etc/cni/net.d/10-flannel.conf 
{ 
“name”: “cbr0”,
“type”: “flannel”,
“delegate”: { 
“isDefaultGateway”: true
} 
} 
EOF

mkdir /usr/share/oci-umount/oci-umount.d -p

mkdir /run/flannel/

cat < /run/flannel/subnet.env 
FLANNEL_NETWORK=10.244.0.0/16 
FLANNEL_SUBNET=10.244.1.0/24 
FLANNEL_MTU=1450 
FLANNEL_IPMASQ=true 
EOF

最后需要新建一個flannel.yml文件:

---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: flannel
rules:
  - apiGroups:
      - ""
    resources:
      - pods
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes/status
    verbs:
      - patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: flannel
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: flannel
subjects:
- kind: ServiceAccount
  name: flannel
  namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: flannel
  namespace: kube-system
---
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": "10.10.0.0/16",    #這里換成集群所在的網段
      "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
      tolerations:
      - key: node-role.kubernetes.io/master
        operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.9.1-amd64
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conf
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: quay.io/coreos/flannel:v0.9.1-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/
      volumes:
        - name: run
          hostPath:
            path: /run
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg

執行:

kubectl create -f ./flannel.yml

默認情況下,master節點不參與工作負載,但如果希望安裝出一個all-in-one的k8s環境,則可以執行以下命令,讓master節點成為一個node節點:

kubectl taint nodes --all node-role.kubernetes.io/master-

執行之后,運行以下命令,查看節點信息:

kubectl get nodes

會看到如下的輸出:

NAME            STATUS     ROLES     AGE       VERSION
k8s-master      Ready      master    18h       v1.11.0
以下是節點配置

在配置好主節點之后,就可以配置集群的其他節點了,這里建議直接安裝之前做好準備工作的系統鏡像
進入節點機器之后,直接執行之前保存好的命令

kubeadm join 10.10.207.253:6443 --token t69z6h.lr2etdbg9mfx5r15 --discovery-token-ca-cert-hash sha256:90e3a748c0eb4cb7058f3d0ee8870ee5d746214ab0589b5e841fd5d68fec8f00

執行完后會看到:

[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_wrr ip_vs_sh ip_vs ip_vs_rr] or no builtin kernel ipvs support: map[ip_vs_rr:{} ip_vs_wrr:{} ip_vs_sh:{} nf_conntrack_ipv4:{} ip_vs:{}]
you can solve this problem with following methods:
 1. Run "modprobe -- " to load missing kernel modules;
2. Provide the missing builtin kernel ipvs support

I0725 09:59:27.929247   10196 kernel_validator.go:81] Validating kernel version
I0725 09:59:27.929356   10196 kernel_validator.go:96] Validating kernel config
[discovery] Trying to connect to API Server "10.10.207.253:6443"
[discovery] Created cluster-info discovery client, requesting info from "https://10.10.207.253:6443"
[discovery] Requesting info from "https://10.10.207.253:6443" 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 "10.10.207.253:6443"
[discovery] Successfully established connection with API Server "10.10.207.253:6443"
[kubelet] Downloading configuration for the kubelet from the "kubelet-config-1.11" 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 "k8s-node1" as an annotation

This node has joined the cluster:
* Certificate signing request was sent to master 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.

這里就表示執行完畢了,可以去主節點執行命令:

kubectl get nodes

可以看到節點已加入集群:

NAME        STATUS    ROLES     AGE       VERSION
k8s-master  Ready     master    20h       v1.11.0
k8s-node1   Ready         20h       v1.11.0
k8s-node2   Ready         20h       v1.11.0

這期間可能需要等待一段時間,狀態才會全部變為ready

kubernetes-dashboard安裝

詳見:kubernetes安裝dashboard

采坑指南

有時會出現master節點一直處于notready的狀態,這里可能是沒有啟動flannel,只需要按照上面的教程配置好flannel,然后執行:

kubectl create -f ./flannel.yml

結語

參考資料:https://blog.myzony.com/cento...

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