CentOS 7.6安装Kubernetes v1.15.1

kubeadm是Kubernetes官方提供的用于快速安装Kubernetes集群的工具，伴随Kubernetes每个版本的发布都会同步更新，kubeadm会对集群配置方面的一些实践做调整，通过实验kubeadm可以学习到Kubernetes官方在集群配置上一些新的最佳实践。

最近发布的Kubernetes 1.15中，kubeadm对HA集群的配置已经达到beta可用，说明kubeadm距离生产环境中可用的距离越来越近了。

Kubernetes集群组件:

etcd 一个高可用的K/V键值对存储和服务发现系统
flannel 实现夸主机的容器网络的通信
kube-apiserver 提供kubernetes集群的API调用
kube-controller-manager 确保集群服务
kube-scheduler 调度容器，分配到Node
kubelet 在Node节点上按照配置文件中定义的容器规格启动容器
kube-proxy 提供网络代理服务

一、环境介绍

主机名	IP地址
k8s-master	192.168.169.21
k8s-node1	192.168.169.24
k8s-node2	192.168.169.25
k8s-node3	192.168.169.26

1、操作系统： CensOS7.6

[root@k8s-master ~]# cat /etc/RedHat-release CentOS Linux release 7.6.1810 (Core)

2、Kubernetes版本 v1.15.0

kube-apiserver v1.15.0 kube-controller-manager v1.15.0 kube-proxy v1.15.0 kube-scheduler v1.15.0 etcd 3.3.10 pause 3.1 coredns 1.3.1

二、准备

2.1系统配置

在安装之前，需要先做如下准备。4台CentOS 7.6主机如下：

升级系统

# yum -y update

配置Host

# cat /etc/hosts 127.0.0.1 localhost 192.168.1.21 k8s-master 192.168.1.24 k8s-node1 192.168.1.25 k8s-node2 192.168.1.26 k8s-node3

如果各个主机启用了防火墙，需要开放Kubernetes各个组件所需要的端口，可以查看Installing kubeadm中的”Check required ports”一节。这里简单起见在各节点禁用防火墙：

# systemctl stop firewalld # systemctl disable firewalld

禁用SELINUX：

# setenforce 0 # sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config # SELINUX=disabled

创建/etc/sysctl.d/k8s.conf文件，添加如下内容：

net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 net.ipv4.ip_forward = 1

执行命令使修改生效。

# modprobe br_netfilter # sysctl -p /etc/sysctl.d/k8s.conf

2.2kube-proxy开启ipvs的前置条件

由于ipvs已经加入到了内核的主干，所以为kube-proxy开启ipvs的前提需要加载以下的内核模块：

ip_vs ip_vs_rr ip_vs_wrr ip_vs_sh nf_conntrack_ipv4

在所有的Kubernetes节点上执行以下脚本:

# cat > /etc/sysconfig/modules/ipvs.modules <<EOF #!/bin/bash modprobe -- ip_vs modprobe -- ip_vs_rr modprobe -- ip_vs_wrr modprobe -- ip_vs_sh modprobe -- nf_conntrack_ipv4 EOF # chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4

上面脚本创建了的/etc/sysconfig/modules/ipvs.modules文件，保证在节点重启后能自动加载所需模块。使用lsmod | grep -e ip_vs -e nf_conntrack_ipv4命令查看是否已经正确加载所需的内核模块。

接下来还需要确保各个节点上已经安装了ipset软件包

# yum -y install ipset

为了便于查看ipvs的代理规则，最好安装一下管理工具ipvsadm

# yum -y install ipvsadm

如果以上前提条件如果不满足，则即使kube-proxy的配置开启了ipvs模式，也会退回到iptables模式

2.3安装Docker

Kubernetes从1.6开始使用CRI(Container Runtime Interface)容器运行时接口。默认的容器运行时仍然是Docker，使用的是kubelet中内置dockershim CRI实现。

安装docker的yum源:

# yum install -y yum-utils device-mapper-persistent-data lvm2 # yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

查看最新的Docker版本：

# yum list docker-ce.x86_64 --showduplicates |sort -r docker-ce.x86_64 3:18.09.7-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.6-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.5-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.4-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.3-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.2-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.1-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-stable docker-ce.x86_64 18.06.3.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.06.2.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.06.0.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.03.1.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 18.03.0.ce-1.el7.centos docker-ce-stable

Kubernetes 1.15当前支持的docker版本列表是1.13.1, 17.03, 17.06, 17.09, 18.06, 18.09。这里在各节点安装docker的18.09.7版本。

# yum makecache fast # yum install -y --setopt=obsoletes=0 docker-ce # systemctl start docker # systemctl enable docker

安装指定版本docker yum install -y –setopt=obsoletes=0 docker-ce-18.09.7-3.el7 确认一下iptables filter表中FOWARD链的默认策略(pllicy)为ACCEPT。

# iptables -nvL Chain INPUT (policy ACCEPT 263 packets, 19209 bytes) pkts bytes target prot opt in out source destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 DOCKER-USER all -- * * 0.0.0.0/0 0.0.0.0/0 0 0 DOCKER-ISOLATION-STAGE-1 all -- * * 0.0.0.0/0 0.0.0.0/0 0 0 ACCEPT all -- * docker0 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED 0 0 DOCKER all -- * docker0 0.0.0.0/0 0.0.0.0/0 0 0 ACCEPT all -- docker0 !docker0 0.0.0.0/0 0.0.0.0/0 0 0 ACCEPT all -- docker0 docker0 0.0.0.0/0 0.0.0.0/0

2.4 修改docker cgroup driver为systemd

根据文档CRI installation中的内容，对于使用systemd作为init system的Linux的发行版，使用systemd作为docker的cgroup driver可以确保服务器节点在资源紧张的情况更加稳定，因此这里修改各个节点上docker的cgroup driver为systemd。

创建或修改/etc/docker/daemon.json：

{ "exec-opts": ["native.cgroupdriver=systemd"] }

*如果机器是代理上网，需要配置docker的http代理: # mkdir /etc/systemd/system/docker.service.d # vim /etc/systemd/system/docker.service.d/http-proxy.conf [Service] Environment=”HTTP_PROXY=http://192.168.1.1:3128″ 重启docker：

# systemctl daemon-reload # systemctl restart docker # docker info | grep Cgroup Cgroup Driver: systemd # systemctl show docker --property Environment

三、使用kubeadm部署Kubernetes

3.1 安装kubeadm和kubelet

Master配置

安装kubeadm和kubelet：

3.1.1、配置kubernetes.repo的源，由于官方源国内无法访问，这里使用阿里云yum源

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

测试地址https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64是否可用，如果不可用需要×××

# curl https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/

# yum -y makecache fast # yum install -y kubelet kubeadm kubectl

... Installed: kubeadm.x86_64 0:1.15.0-0 kubectl.x86_64 0:1.15.0-0 kubelet.x86_64 0:1.15.0-0

Dependency Installed: conntrack-tools.x86_64 0:1.4.4-4.el7 cri-tools.x86_64 0:1.12.0-0 kubernetes-cni.x86_64 0:0.7.5-0 libnetfilter_cthelper.x86_64 0:1.0.0-9.el7 libnetfilter_cttimeout.x86_64 0:1.0.0-6.el7 libnetfilter_queue.x86_64 0:1.0.2-2.el7_2

从安装结果可以看出还安装了cri-tools, kubernetes-cni, socat三个依赖：

•官方从Kubernetes 1.14开始将cni依赖升级到了0.7.5版本

•socat是kubelet的依赖

•cri-tools是CRI(Container Runtime Interface)容器运行时接口的命令行工具

运行kubelet –help可以看到原来kubelet的绝大多数命令行flag参数都被DEPRECATED了，如：

...... --address 0.0.0.0 The IP address for the Kubelet to serve on (set to 0.0.0.0 for all IPv4 interfaces and `::` for all IPv6 interfaces) (default 0.0.0.0) (DEPRECATED: This parameter should be set via the config file specified by the Kubelet's --config flag. See https://kubernetes.io/docs/tasks/administer-cluster/kubelet-config-file/ for more information.) ......

而官方推荐我们使用–config指定配置文件，并在配置文件中指定原来这些flag所配置的内容。具体内容可以查看这里Set Kubelet parameters via a config file。这也是Kubernetes为了支持动态Kubelet配置（Dynamic Kubelet Configuration）才这么做的，参考Reconfigure a Node’s Kubelet in a Live Cluster。

kubelet的配置文件必须是json或yaml格式，具体可查看这里。

Kubernetes 1.8开始要求关闭系统的Swap，如果不关闭，默认配置下kubelet将无法启动。关闭系统的Swap方法如下:

# swapoff -a

修改 /etc/fstab 文件，注释掉 SWAP 的自动挂载，

# UUID=2d1e946c-f45d-4516-86cf-946bde9bdcd8 swap swap defaults 0 0

使用free -m确认swap已经关闭。 swappiness参数调整，修改/etc/sysctl.d/k8s.conf添加下面一行：

vm.swappiness=0

使修改生效

# sysctl -p /etc/sysctl.d/k8s.conf

3.2 使用kubeadm init初始化集群

开机启动kubelet服务：

systemctl enable kubelet.service

配置Master节点

# mkdir working && cd working

生成配置文件

# kubeadm config print init-defaults ClusterConfiguration > kubeadm.yaml

修改配置文件

# vim kubeadm.yaml

# 修改imageRepository：k8s.gcr.io imageRepository: registry.aliyuncs.com/google_containers # 修改KubernetesVersion:v1.15.0 kubernetesVersion: v1.15.0 # 配置MasterIP advertiseAddress: 192.168.1.21 # 配置子网网络 networking: dnsDomain: cluster.local podSubnet: 10.244.0.0/16 serviceSubnet: 10.96.0.0/12 scheduler: {}

使用kubeadm默认配置初始化的集群，会在master节点打上node-role.kubernetes.io/master:NoSchedule的污点，阻止master节点接受调度运行工作负载。这里测试环境只有两个节点，所以将这个taint修改为node-role.kubernetes.io/master:PreferNoSchedule。在开始初始化集群之前可以使用kubeadm config images pull预先在各个节点上拉取所k8s需要的docker镜像。

接下来使用kubeadm初始化集群，选择node1作为Master Node，在node1上执行下面的命令：

# kubeadm init --config kubeadm.yaml --ignore-preflight-errors=Swap .......... Your Kubernetes control-plane 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/ Then you can join any number of worker nodes by running the following on each as root: kubeadm join 192.168.1.21:6443 --token 4qcl2f.gtl3h8e5kjltuo0r --discovery-token-ca-cert-hash sha256:7ed5404175cc0bf18dbfe53f19d4a35b1e3d40c19b10924275868ebf2a3bbe6e

注意这一条命令需要保存好（添加集群使用） kubeadm join 192.168.169.21:6443 –token 4qcl2f.gtl3h8e5kjltuo0r –discovery-token-ca-cert-hash sha256:7ed5404175cc0bf18dbfe53f19d4a35b1e3d40c19b10924275868ebf2a3bbe6e 上面记录了完成的初始化输出的内容，根据输出的内容基本上可以看出手动初始化安装一个Kubernetes集群所需要的关键步骤。其中有以下关键内容：

[kubelet-start] 生成kubelet的配置文件”/var/lib/kubelet/config.yaml”

[certs]生成相关的各种证书

[kubeconfig]生成相关的kubeconfig文件

[control-plane]使用/etc/kubernetes/manifests目录中的yaml文件创建apiserver、controller-manager、scheduler的静态pod

[bootstraptoken]生成token记录下来，后边使用kubeadm join往集群中添加节点时会用到

下面的命令是配置常规用户如何使用kubectl访问集群：

mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config

最后给出了将节点加入集群的命令kubeadm join 192.168.169.21:6443 –token 4qcl2f.gtl3h8e5kjltuo0r –discovery-token-ca-cert-hash sha256:7ed5404175cc0bf18dbfe53f19d4a35b1e3d40c19b10924275868ebf2a3bbe6e

查看一下集群状态，确认个组件都处于healthy状态：

# kubectl get cs NAME STATUS MESSAGE ERROR controller-manager Healthy ok scheduler Healthy ok etcd-0 Healthy {"health":"true"}

集群初始化如果遇到问题，可以使用下面的命令进行清理：

# kubeadm reset # ifconfig cni0 down # ip link delete cni0 # ifconfig flannel.1 down # ip link delete flannel.1 # rm -rf /var/lib/cni/

3.3 安装Pod Network

接下来安装flannel network add-on：

# mkdir -p ~/k8s/ # cd ~/k8s # curl -O https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml # kubectl apply -f kube-flannel.yml

clusterrole.rbac.authorization.k8s.io/flannel created clusterrolebinding.rbac.authorization.k8s.io/flannel created serviceaccount/flannel created configmap/kube-flannel-cfg created daemonset.extensions/kube-flannel-ds-amd64 created daemonset.extensions/kube-flannel-ds-arm64 created daemonset.extensions/kube-flannel-ds-arm created daemonset.extensions/kube-flannel-ds-ppc64le created daemonset.extensions/kube-flannel-ds-s390x created

这里注意kube-flannel.yml这个文件里的flannel的镜像是0.11.0，quay.io/coreos/flannel:v0.11.0-amd64 如果Node有多个网卡的话，参考flannel issues 39701，目前需要在kube-flannel.yml中使用–iface参数指定集群主机内网网卡的名称，否则可能会出现dns无法解析。需要将kube-flannel.yml下载到本地，flanneld启动参数加上–iface=<iface-name>

containers: - name: kube-flannel image: quay.io/coreos/flannel:v0.11.0-amd64 command: - /opt/bin/flanneld args: - --ip-masq - --kube-subnet-mgr - --iface=eth1 ......

使用kubectl get pod –all-namespaces -o wide确保所有的Pod都处于Running状态。

# kubectl get pod -n kube-system NAME READY STATUS RESTARTS AGE coredns-5c98db65d4-dr8lf 1/1 Running 0 52m coredns-5c98db65d4-lp8dg 1/1 Running 0 52m etcd-node1 1/1 Running 0 51m kube-apiserver-node1 1/1 Running 0 51m kube-controller-manager-node1 1/1 Running 0 51m kube-flannel-ds-amd64-mm296 1/1 Running 0 44s kube-proxy-kchkf 1/1 Running 0 52m kube-scheduler-node1 1/1 Running 0 51m

3.4 测试集群DNS是否可用

# kubectl run curl --image=radial/busyboxplus:curl -it kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead. If you don't see a command prompt, try pressing enter. [ root@curl-5cc7b478b6-r997p:/ ]$

注：在此过程中可能会出现curl容器一直处于pending状态，报错信息如下： 0/1 nodes are available: 1 node(s) had taints that the pod didn’t tolerate. 解决方法： # kubectl taint nodes –all node-role.kubernetes.io/master- 进入后执行nslookup kubernetes.default确认解析正常:

$ nslookup kubernetes.default Server: 10.96.0.10 Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name: kubernetes.default Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local

Node节点配置

安装docker的yum源:

# yum install -y yum-utils device-mapper-persistent-data lvm2 # yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo # yum install -y --setopt=obsoletes=0 docker-ce

安装kubeadm和kubelet：

配置kubernetes.repo的源，由于官方源国内无法访问，这里使用阿里云yum源

测试地址https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64是否可用，如果不可用需要×××

# curl https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/

# yum -y makecache fast # yum install -y kubelet kubeadm kubectl

... Installed: kubeadm.x86_64 0:1.15.0-0 kubectl.x86_64 0:1.15.0-0 kubelet.x86_64 0:1.15.0-0

# swapoff -a

修改 /etc/fstab 文件，注释掉 SWAP 的自动挂载，

# UUID=2d1e946c-f45d-4516-86cf-946bde9bdcd8 swap swap defaults 0 0

使用free -m确认swap已经关闭。 swappiness参数调整，修改/etc/sysctl.d/k8s.conf添加下面一行：

net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 net.ipv4.ip_forward = 1 vm.swappiness=0

使修改生效

# sysctl -p /etc/sysctl.d/k8s.conf

下面将node1这个主机添加到Kubernetes集群中，在node1上执行:

# kubeadm join 192.168.1.21:6443 --token 4qcl2f.gtl3h8e5kjltuo0r --discovery-token-ca-cert-hash sha256:7ed5404175cc0bf18dbfe53f19d4a35b1e3d40c19b10924275868ebf2a3bbe6e --ignore-preflight-errors=Swap

[preflight] Running pre-flight checks [WARNING Swap]: running with swap on is not supported. Please disable swap [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service' [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml' [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" ConfigMap in the kube-system namespace [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Activating the kubelet service [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...

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 control-plane to see this node join the cluster.

node1加入集群很是顺利，下面在master节点上执行命令查看集群中的节点：

# kubectl get node NAME STATUS ROLES AGE VERSION node1 Ready master 57m v1.15.0 node2 Ready <none> 11s v1.15.0

如何从集群中移除Node 如果需要从集群中移除node2这个Node执行下面的命令：在master节点上执行： # kubectl drain node2 –delete-local-data –force –ignore-daemonsets # kubectl delete node node2

在node2上执行： # kubeadm reset # ifconfig cni0 down # ip link delete cni0 # ifconfig flannel.1 down # ip link delete flannel.1 # rm -rf /var/lib/cni/

报错： error execution phase preflight: couldn’t validate the identity of the API Server: abort connecting to API servers after timeout of 5m0s # kubeadm join …… error execution phase preflight: couldn’t validate the identity of the API Server: abort connecting to API servers after timeout of 5m0

原因：master节点的token过期了

解决：重新生成新token 在master重新生成token # kubeadm token create 424mp7.nkxx07p940mkl2nd # openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed ‘s/^.* //’ d88fb55cb1bd659023b11e61052b39bbfe99842b0636574a16c76df186fd5e0d

Node节点重新join就可以了 kubeadm join 192.168.169.21:6443 –token 424mp7.nkxx07p940mkl2nd --discovery-token-ca-cert-hash sha256:d88fb55cb1bd659023b11e61052b39bbfe99842b0636574a16c76df186fd5e0d 四、kube-proxy开启ipvs

修改ConfigMap的kube-system/kube-proxy中的config.conf，mode: “ipvs”

# kubectl edit cm kube-proxy -n kube-system minSyncPeriod: 0s scheduler: "" syncPeriod: 30s kind: KubeProxyConfiguration metricsBindAddress: 127.0.0.1:10249 mode: "ipvs" # 加上这个 nodePortAddresses: null

其中mode原来是空，默认为iptables模式，改为ipvs scheduler默认是空，默认负载均衡算法为轮训编辑完，保存退出

删除所有kube-proxy的pod # kubectl delete pod xxx -n kube-system 之后重启各个节点上的kube-proxy pod：

# kubectl get pod -n kube-system | grep kube-proxy | awk '{system("kubectl delete pod "$1" -n kube-system")}'

# kubectl get pod -n kube-system | grep kube-proxy kube-proxy-7fsrg 1/1 Running 0 3s kube-proxy-k8vhm 1/1 Running 0 9s

# kubectl logs kube-proxy-7fsrg -n kube-system I0703 04:42:33.308289 1 server_others.go:170] Using ipvs Proxier. W0703 04:42:33.309074 1 proxier.go:401] IPVS scheduler not specified, use rr by default I0703 04:42:33.309831 1 server.go:534] Version: v1.15.0 I0703 04:42:33.320088 1 conntrack.go:52] Setting nf_conntrack_max to 131072 I0703 04:42:33.320365 1 config.go:96] Starting endpoints config controller I0703 04:42:33.320393 1 controller_utils.go:1029] Waiting for caches to sync for endpoints config controller I0703 04:42:33.320455 1 config.go:187] Starting service config controller I0703 04:42:33.320470 1 controller_utils.go:1029] Waiting for caches to sync for service config controller I0703 04:42:33.420899 1 controller_utils.go:1036] Caches are synced for endpoints config controller I0703 04:42:33.420969 1 controller_utils.go:1036] Caches are synced for service config controller

日志中打印出了Using ipvs Proxier，说明ipvs模式已经开启。

五、Kubernetes常用组件部署

越来越多的公司和团队开始使用Helm这个Kubernetes的包管理器，这里也将使用Helm安装Kubernetes的常用组件。

5.1、Helm的安装

Helm由客户端命helm令行工具和服务端tiller组成，Helm的安装十分简单。下载helm命令行工具到master节点node1的/usr/local/bin下，这里下载的2.14.1版本

# curl -O https://get.helm.sh/helm-v2.14.1-linux-amd64.tar.gz # tar -zxvf helm-v2.14.1-linux-amd64.tar.gz # cd linux-amd64/ # cp helm /usr/local/bin/

为了安装服务端tiller，还需要在这台机器上配置好kubectl工具和kubeconfig文件，确保kubectl工具可以在这台机器上访问apiserver且正常使用。这里的node1节点已经配置好了kubectl。

因为Kubernetes APIServer开启了RBAC访问控制，所以需要创建tiller使用的service account: tiller并分配合适的角色给它。详细内容可以查看helm文档中的Role-based Access Control。这里简单起见直接分配cluster-admin这个集群内置的ClusterRole给它。创建helm-rbac.yaml文件

apiVersion: v1 kind: ServiceAccount metadata: name: tiller namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRoleBinding metadata: name: tiller roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: cluster-admin subjects: - kind: ServiceAccount name: tiller namespace: kube-system

# kubectl create -f helm-rbac.yaml serviceaccount/tiller created clusterrolebinding.rbac.authorization.k8s.io/tiller created

接下来使用helm部署tiller:

# helm init --service-account tiller --skip-refresh Creating /root/.helm Creating /root/.helm/repository Creating /root/.helm/repository/cache Creating /root/.helm/repository/local Creating /root/.helm/plugins Creating /root/.helm/starters Creating /root/.helm/cache/archive Creating /root/.helm/repository/repositories.yaml Adding stable repo with URL: https://kubernetes-charts.storage.googleapis.com Adding local repo with URL: http://127.0.0.1:8879/charts $HELM_HOME has been configured at /root/.helm.

Tiller (the Helm server-side component) has been installed into your Kubernetes Cluster.

Please note: by default, Tiller is deployed with an insecure 'allow unauthenticated users' policy. To prevent this, run `helm init` with the --tiller-tls-verify flag. For more information on securing your installation see: https://docs.helm.sh/using_helm/#securing-your-helm-installation Happy Helming!

tiller默认被部署在k8s集群中的kube-system这个namespace下：

# kubectl get pod -n kube-system -l app=helm NAME READY STATUS RESTARTS AGE tiller-deploy-c4fd4cd68-dwkhv 1/1 Running 0 83s

注：如果tiller的状态一直是ErrImagePull的时候，需要更换国内helm源。 NAME READY STATUS RESTARTS AGE tiller-deploy-7bf78cdbf7-fkx2z 0/1 ImagePullBackOff 0 79s

解决方法1： 1、删除默认源 # helm repo remove stable 2、增加新的国内镜像源 # helm repo add stable https://burdenbear.github.io/kube-charts-mirror/ 或 # helm repo add stable https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts 3、查看helm源情况 # helm repo list 4、搜索测试 # helm search MySQL

解决方法2： 1、手动下载images # docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.14.1

2、查看tiller需要的镜像名 # kubectl get pods -n kube-system NAME READY STATUS RESTARTS AGE coredns-bccdc95cf-tb6pf 1/1 Running 3 5h21m coredns-bccdc95cf-xpgm8 1/1 Running 3 5h21m etcd-master 1/1 Running 3 5h20m kube-apiserver-master 1/1 Running 3 5h21m kube-controller-manager-master 1/1 Running 3 5h21m kube-flannel-ds-amd64-b4ksb 1/1 Running 3 5h18m kube-flannel-ds-amd64-vmv29 1/1 Running 0 127m kube-proxy-67zn6 1/1 Running 2 37m kube-proxy-992ns 1/1 Running 0 37m kube-scheduler-master 1/1 Running 3 5h21m tiller-deploy-7bf78cdbf7-fkx2z 0/1 ImagePullBackOff 0 33m

3、使用describe查看镜像名 # kubectl describe pods tiller-deploy-7bf78cdbf7-fkx2z -n kube-system ………. Normal Scheduled 32m default-scheduler Successfully assigned kube-system/tiller-deploy-7bf78cdbf7-fkx2z to node1 Normal Pulling 30m (x4 over 32m) kubelet, node1 Pulling image “gcr.io/kubernetes-helm/tiller:v2.14.1” Warning Failed 30m (x4 over 31m) kubelet, node1 Failed to pull image “gcr.io/kubernetes-helm/tiller:v2.14.1”: rpc error: code = Unknown desc = Error response from daemon: Get https://gcr.io/v2/: Service Unavailable Warning Failed 30m (x4 over 31m) kubelet, node1 Error: ErrImagePull Warning Failed 30m (x6 over 31m) kubelet, node1 Error: ImagePullBackOff Normal BackOff 111s (x129 over 31m) kubelet, node1 Back-off pulling image “gcr.io/kubernetes-helm/tiller:v2.14.1”

4、使用docker tag 重命令镜像 # docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.14.1 gcr.io/kubernetes-helm/tiller:v2.14.1

5、删除多余的镜像 # docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.14.1

6、删除失败的pod # kubectl delete deployment tiller-deploy -n kube-system

稍等一会儿就可以使用kubectl get pods -n kube-system查看状态已经正常了 # helm version Client: &version.Version{SemVer:"v2.14.1", GitCommit:"5270352a09c7e8b6e8c9593002a73535276507c0", GitTreeState:"clean"} Server: &version.Version{SemVer:"v2.14.1", GitCommit:"5270352a09c7e8b6e8c9593002a73535276507c0", GitTreeState:"clean"}

注意由于某些原因需要网络可以访问gcr.io和kubernetes-charts.storage.googleapis.com，如果无法访问可以通过helm init –service-account tiller –tiller-image <your-docker-registry>/tiller:v2.13.1 –skip-refresh使用私有镜像仓库中的tiller镜像最后在node1上修改helm chart仓库的地址为azure提供的镜像地址：

# helm repo add stable http://mirror.azure.cn/kubernetes/charts "stable" has been added to your repositories

# helm repo list NAME URL stable http://mirror.azure.cn/kubernetes/charts local http://127.0.0.1:8879/charts

5.2、使用Helm部署Nginx Ingress

为了便于将集群中的服务暴露到集群外部，需要使用Ingress。接下来使用Helm将Nginx Ingress部署到Kubernetes上。 Nginx Ingress Controller被部署在Kubernetes的边缘节点上，关于Kubernetes边缘节点的高可用相关的内容可以查看之前整理的Bare metal环境下Kubernetes Ingress边缘节点的高可用,Ingress Controller使用hostNetwork。

我们将master(192.168.1.21)做为边缘节点，打上Label：

# kubectl label node master node-role.kubernetes.io/edge= node/master labeled

# kubectl get node NAME STATUS ROLES AGE VERSION master Ready edge,master 138m v1.15.0 node1 Ready <none> 82m v1.15.0

如果想删除一个node的label标记，使用以下命令 # kubectl label node node1 node-role.kubernetes.io/edge- 创建 ingress-nginx.yaml

stable/nginx-ingress chart的值文件ingress-nginx.yaml如下： controller: replicaCount: 1 hostNetwork: true nodeSelector: node-role.kubernetes.io/edge: '' affinity: podAntiAffinity: requiredDuringSchedulingIgnoredDuringExecution: - labelSelector: matchExpressions: - key: app operator: In values: - nginx-ingress - key: component operator: In values: - controller topologyKey: kubernetes.io/hostname tolerations: - key: node-role.kubernetes.io/master operator: Exists effect: NoSchedule - key: node-role.kubernetes.io/master operator: Exists effect: PreferNoSchedule defaultBackend: nodeSelector: node-role.kubernetes.io/edge: '' tolerations: - key: node-role.kubernetes.io/master operator: Exists effect: NoSchedule - key: node-role.kubernetes.io/master operator: Exists effect: PreferNoSchedule

nginx ingress controller的副本数replicaCount为1，将被调度到master这个边缘节点上。这里并没有指定nginx ingress controller service的externalIPs，而是通过hostNetwork: true设置nginx ingress controller使用宿主机网络。

# helm repo update

# helm install stable/nginx-ingress -n nginx-ingress --namespace ingress-nginx -f ingress-nginx.yaml

# kubectl get pod -n ingress-nginx -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES nginx-ingress-controller-cc9b6d55b-pr8vr 1/1 Running 0 10m 192.168.1.21 node1 <none> <none> nginx-ingress-default-backend-cc888fd56-bf4h2 1/1 Running 0 10m 10.244.0.14 node1 <none> <none>

如果发现nginx-ingress的容器状态是ContainersCreating/ImagePullBackOff，则需要手动下载镜像 # docker pull registry.aliyuncs.com/google_containers/nginx-ingress-controller:0.25.0 # docker tag registry.aliyuncs.com/google_containers/nginx-ingress-controller:0.25.0 quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.25.0 # docker pull registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/defaultbackend-amd64:1.5 # docker tag registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/defaultbackend-amd64:1.5 k8s.gcr.io/defaultbackend-amd64:1.5 # docker rmi registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/defaultbackend-amd64:1.5 # docker rim registry.aliyuncs.com/google_containers/nginx-ingress-controller:0.25.0 如果访问http://192.168.1.21返回default backend，则部署完成。

5.3、使用Helm部署dashboard

创建 kubernetes-dashboard.yaml：

image: repository: registry.aliyuncs.com/google_containers/kubernetes-dashboard-amd64 tag: v1.10.1 ingress: enabled: true hosts: - k8s.frognew.com #这里是你将来访问dashboard的域名 annotations: nginx.ingress.kubernetes.io/ssl-redirect: "true" nginx.ingress.kubernetes.io/backend-protocol: "HTTPS" tls: - secretName: frognew-com-tls-secret hosts: - k8s.frognew.com nodeSelector: node-role.kubernetes.io/edge: '' tolerations: - key: node-role.kubernetes.io/master operator: Exists effect: NoSchedule - key: node-role.kubernetes.io/master operator: Exists effect: PreferNoSchedule rbac: clusterAdminRole: true

执行安装

helm install stable/kubernetes-dashboard -n kubernetes-dashboard --namespace kube-system -f kubernetes-dashboard.yaml

5.4、生成用户token

a、创建admin-sa.yaml

apiVersion: rbac.authorization.k8s.io/v1beta1 metadata: name: admin annotations: rbac.authorization.kubernetes.io/autoupdate: "true" roleRef: kind: ClusterRole name: cluster-admin apiGroup: rbac.authorization.k8s.io subjects: kind: ServiceAccount name: admin namespace: kube-system apiVersion: v1 kind: ServiceAccount metadata: name: admin namespace: kube-system labels: kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile

b、创建admin-sa的pod

# kubectl create -f admin-sa.yaml

# kubectl get secret -n kube-system NAME TYPE DATA AGE admin-token-2tbzp kubernetes.io/service-account-token 3 9m5s attachdetach-controller-token-bmz2c kubernetes.io/service-account-token 3 27h bootstrap-signer-token-6jctj kubernetes.io/service-account-token 3 27h certificate-controller-token-l4l9c kubernetes.io/service-account-token 3 27h

c、生成 admin-token

# kubectl get secret admin-token-2tbzp -o jsonpath={.data.token} -n kube-system|base64 -d

eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJhZG1pbi10b2tlbi0ydGJ6cCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50Lm5hbWUiOiJhZG1pbiIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50LnVpZCI6ImRlOGU5N2EzLWY1YmItNGRlNC1hN2Q1LTY5YzEwYTIyZTE3OSIsInN1YiI6InN5c3RlbTpzZXJ2aWNlYWNjb3VudDprdWJlLXN5c3RlbTphZG1pbiJ9.NgZvr3XTtrW1XPCJHYRFFdPD1IfsoRRTYJHwAST2gfhY1hva_yIoh1ATSpDO551rNio0ulb7YllSiZMaQViBeFTiAhuuIlKHKyELOoB_eY7jFTCVstdr4vQzH5e2GRQgljEeqbF9Lewr0n_eqIS6pgVQSRT8at-Yk6EXLM0XhYf4qbAvMuztuRTSp8JKmal65gwTxTJU7LpjJM7UbZ8UelVOjNZK8BFCezGv0ccqXywLu5-aAj2NvSHVThg6jybj37R0hszqRw2fkGZtIcEOEtgmij2vHa3oNb3f38gd1eE6WqZpJpVOPLlX6QNSxiV0jaaj9AqodFCdAg48E75Bvg

注意：admin-token的pod名称其中 admin-token-2tbzp 是 kubectl get secret -n kube-system 看到的admin-token名称 d、使用生成的token去浏览器中登录

容器镜像服务容器 node.js yum kubernetes

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