本篇内容介绍了“如何使用docker镜像安装Kubernetes1.12.2”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
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kubernetes 1.12.2版本安装
起码准两台机器：master,node
ip: master:192.168.1.220
node1:192.168.1.221
node2:192.168.1.205
环境：centos7
配置：2核4G起
注意事项：
docker版本最高支持18.06,高于要此版本报错
kubernetes12.2+docker-ce18.06.1ce
（一）环境配置：
在master和node 端执行：
1：安全策略规则配置
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
iptables -F
iptables -t nat -F
iptables -I FORWARD -s 0.0.0.0/0 -d 0.0.0.0/0 -j ACCEPT
yum -y install ntp
ntpdate pool.ntp.org
systemctl start ntpd
systemctl enable ntpd
2：内核设置：
关闭selinux
vim /etc/sysconfig/selinux
SELINUX=disable
修改内核参数
$vim /etc/sysctl.conf
net.ipv4.ip_forward=1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-arptables = 1
vm.swappiness=0
关闭swap
swapoff -a
注释自动挂载
vim /etc/fstab
关闭selinux
vim /etc/selinux/config
保存修改内核参数
sysctl -p
确保以下两个文件里面显示值为1：
[root@k8m1 ~]# cat /proc/sys/net/bridge/bridge-nf-call-ip6tables
1
[root@k8m1 ~]# cat /proc/sys/net/bridge/bridge-nf-call-ip6tables
每个节点都修改下面值，
[root@k8n2 ~]# vim /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="fail-swap-on=false"
3：域名解析，免密登录，时间同步
a:
[root@k8m1 ~]# vim /etc/hosts
[root@k8m1 ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.220 k8m1
192.168.1.221 k8n1
192.168.1.205 k8n2
b:
[root@k8m1 ~]# vim /etc/hosts
[root@k8m1 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:ldQKudY4N7CV+VrQV6qCOeEC5KlKIeLk7F8tR/cm8kI root@k8m1
The key's randomart image is:
+---[RSA 2048]----+
| . ..= ..|
| o . +.=.o .. |
|oo + .Oo+ .. |
|B .. . .*== o. |
| =. .oS+.+. |
|o. oE..o. |
|.. o.+ . o |
| . . o.o o |
| . .. |
+----[SHA256]-----+
[root@k8m1 ~]# ssh-copy-id -i ~/.ssh/id_rsa k8n1
[root@k8m1 ~]# ssh-copy-id -i ~/.ssh/id_rsa k8n2
c:master和node端分别执行
[root@k8m1 ~]# yum -y install ntp
[root@k8m1 ~]# ntpdate pool.ntp.org
10 Nov 11:07:32 ntpdate[50259]: step time server 193.228.143.22 offset 14.725020 sec
[root@k8m1 ~]# systemctl start ntpd
[root@k8m1 ~]# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
[root@k8m1 ~]#
（二）安装docker:安装官方要求安装
配置docker-CE源 :master node都要配置
$ sudo yum install -y yum-utils
device-mapper-persistent-data
lvm2
$sudo yum-config-manager
--add-repo
https://download.docker.com/linux/centos/docker-ce.repo
$ yum list docker-ce --showduplicates | sort -r
$yum install docker-ce-18.06.1.ce
备注：目前kubernetes1.12.2支持docker版本最多18.06,docker版本已经更新到18.9了，
所以不能指只有yum安装最新版，要指定版本型号
$systemctl start docker
$systemctl enable docker
$systemctl status docker
执行下面命令配置加速器：
curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
然后重启docker
$systemctl restart docker
配置阿里云：
[root@k8n2 yum.repos.d]# wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
#yum repolist
（三）配置kubernetes源：
vim /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes Rope
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
enabled=1
[root@k8n2 yum.repos.d]# yum repolist
已加载插件：fastestmirror
kubernetes | 1.4 kB 00:00:00
kubernetes/primary | 37 kB 00:00:00
updates: mirrors.aliyun.com
kubernetes 272/272
源标识 源名称 状态
base/7/x86_64 CentOS-7 - Base 9,911
docker-ce-stable/x86_64 Docker CE Stable - x86_64 25
epel/x86_64 Extra Packages for Enterprise Linux 7 - x86_64 12,696
extras/7/x86_64 CentOS-7 - Extras 434
kubernetes Kubernetes Rope 272
updates/7/x86_64 CentOS-7 - Updates 1,614
在master端安装：
#yum install -y kubelet kubeadm kubectl
kubeadm init --help #查看初始化命令帮助
kubeadm config images list
使用下面这条命令：查看到所需要都安装组件有以下这些：
kubeadm config images list
服务组件：
k8s.gcr.io/kube-apiserver:v1.12.2
k8s.gcr.io/kube-controller-manager:v1.12.2
k8s.gcr.io/kube-scheduler:v1.12.2
k8s.gcr.io/kube-proxy:v1.12.2
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.2.24
k8s.gcr.io/core:1.2.2
这下做组件怎么安装能？当然是去dockerHub
使用下面命令docker pull下来：
docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.12.2
docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.12.2
docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.12.2
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.12.2
docker pull mirrorgooglecontainers/pause-amd64:3.1
docker pull mirrorgooglecontainers/etcd-amd64:3.2.24
docker pull kuberneter/coredns:1.2.2
给下载下来都镜像组件tag上和服务组件同样都标签：
docker tag mirrorgooglecontainers/kube-apiserver-amd64:v1.12.2 k8s.gcr.io/kube-apiserver:v1.12.2
docker tag mirrorgooglecontainers/kube-controller-manager-amd64:v1.12.2 k8s.gcr.io/kube-controller-manager:v1.12.2
docker tag mirrorgooglecontainers/kube-scheduler-amd64:v1.12.2 k8s.gcr.io/kube-scheduler:v1.12.2
docker tag mirrorgooglecontainers/kube-proxy-amd64:v1.12.2 k8s.gcr.io/kube-proxy:v1.12.2
docker tag mirrorgooglecontainers/pause-amd64:3.1 k8s.gcr.io/pause:3.1
docker tag mirrorgooglecontainers/etcd-amd64:3.2.24 k8s.gcr.io/etcd:3.2.24
docker tag kuberneter/coredns:1.2.2 k8s.gcr.io/coredns:1.2.2
初始化集群，只在master端执行： （）注意修改为master地址）
kubeadm init
--kubernetes-version=v1.12.2
--pod-network-cidr=10.244.0.0/16
--apiserver-advertise-address=192.168.1.220
master初始化之后会出现以下token，要复制下来保存好，加node要用：
kubeadm join 192.168.1.220:6443 --token o4bmhn.12ppkvve2cecgk6m --discovery-token-ca-cert-hash sha256:03b9e1d1979288194bcf694c12a85217236319cfdf1b89aae803e430796c611b
如果上面都token忘记了 可以通过以下命令获得：
kubeadmin token list
此时root用户还不能使用kubelet控制集群需要，配置下环境变量
对于非root用户
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
启动faannel
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml
root 用户执行以下配置环境变量
export KUBECONFIG=/etc/kubernetes/admin.conf
也可以直接放到~/.bash_profile
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile
kubectl get pods --all-namespaces
node节点要安装都软件：
#yum install -y kubelet kubeadm kubectl
[root@k8n2 ~]# vim /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="--fail-swap-on=false"
node节点要安装的docker镜像：
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.12.2
docker pull mirrorgooglecontainers/pause-amd64:3.1
docker pull kuberneter/coredns:1.2.2
docker pull mirrorgooglecontainers/etcd-amd64:3.2.24 #node媏的ETCD可以安装，
也可以不安装需要做ETCD 集群，安装就是
打标签
docker tag mirrorgooglecontainers/kube-proxy-amd64:v1.12.2 k8s.gcr.io/kube-proxy:v1.12.2
docker tag mirrorgooglecontainers/pause-amd64:3.1 k8s.gcr.io/pause:3.1
docker tag kuberneter/coredns:1.2.2 k8s.gcr.io/coredns:1.2.2
执行之前上面保留下来都token：就会自己加入集群
kubeadm join 192.168.1.220:6443 --token o4bmhn.12ppkvve2cecgk6m --discovery-token-ca-cert-hash sha256:03b9e1d1979288194bcf694c12a85217236319cfdf1b89aae803e430796c611b
[root@k8m1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8m1 Ready master 22h v1.12.2
k8n1 Ready
k8n2 Ready
[root@k8m1 ~]# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-576cbf47c7-jqcn8 1/1 Running 0 22h
kube-system coredns-576cbf47c7-rqqvk 1/1 Running 0 22h
kube-system etcd-k8m1 1/1 Running 0 22h
kube-system kube-apiserver-k8m1 1/1 Running 0 22h
kube-system kube-controller-manager-k8m1 1/1 Running 0 22h
kube-system kube-flannel-ds-amd64-ck799 1/1 Running 1 22h
kube-system kube-flannel-ds-amd64-nkdzg 1/1 Running 0 38m
kube-system kube-flannel-ds-amd64-tjp27 1/1 Running 0 22h
kube-system kube-proxy-8b7ds 1/1 Running 0 38m
kube-system kube-proxy-dmswb 1/1 Running 0 22h
kube-system kube-proxy-pm7wt 1/1 Running 0 22h
kube-system kube-scheduler-k8m1 1/1 Running 0 22h
OK,查看节点可能启动比较慢，要稍等，如果加不进去 要排查问题。。
