Kubernetes ---- kubeadm安装kubernetes
作者:互联网
之前就已经装过k8s了,有些东西不常用真的就是容易忘掉,今天我又搞了一遍,并记录下来以此加深印象;
一、环境描述:
kubernetes的版本选择的是v1.15.0版本(之前第一次装还是1.11);
操作系统 | IP地址 | 集群中角色 | k8s需用的docker镜像 |
Centos 7 | 192.168.222.100 | Master |
quay.io/coreos/flannel:v0.12.0-amd64 k8s.gcr.io/kube-proxy:v1.15.0 k8s.gcr.io/kube-apiserver:v1.15.0 k8s.gcr.io/kube-scheduler:v1.15.0 k8s.gcr.io/kube-controller-manager:v1.15.0 k8s.gcr.io/coredns:1.3.1 k8s.gcr.io/etcd:3.3.10 k8s.gcr.io/pause:3.1 |
Centos 7 | 192.168.222.101 | Node |
quay.io/coreos/flannel:v0.12.0-amd64 k8s.gcr.io/kube-proxy:v1.15.0 k8s.gcr.io/pause:3.1 |
Centos 7 | 192.168.222.102 | Node |
quay.io/coreos/flannel:v0.12.0-amd64 k8s.gcr.io/kube-proxy:v1.15.0 k8s.gcr.io/pause:3.1 |
二、环境准备:
1.修改本地hosts文件,添加GitHub及集群内部主机的解析(添加了GitHub相关的地址后会省去很多麻烦= =)node节点也要加哦.
~]# vim /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.222.100 node1
192.168.222.101 node2
192.168.222.192 node3
# GitHub Start
52.74.223.119 github.com
192.30.253.119 gist.github.com
54.169.195.247 api.github.com
185.199.111.153 assets-cdn.github.com
151.101.76.133 raw.githubusercontent.com
151.101.108.133 user-images.githubusercontent.com
151.101.76.133 gist.githubusercontent.com
151.101.76.133 cloud.githubusercontent.com
151.101.76.133 camo.githubusercontent.com
151.101.76.133 avatars0.githubusercontent.com
151.101.76.133 avatars1.githubusercontent.com
151.101.76.133 avatars2.githubusercontent.com
151.101.76.133 avatars3.githubusercontent.com
151.101.76.133 avatars4.githubusercontent.com
151.101.76.133 avatars5.githubusercontent.com
151.101.76.133 avatars6.githubusercontent.com
151.101.76.133 avatars7.githubusercontent.com
151.101.76.133 avatars8.githubusercontent.com
# GitHub End
2.关闭防火墙以及停用Selinux.
~]# systemctl stop firewalld ~]# setenfoce 0
3. 配置Kubernetes的yum源(以下内容是阿里云的内容).
源地址:https://developer.aliyun.com/mirror/kubernetes
~]# 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
4. 配置docker源
~]# yum install -y yum-utils device-mapper-persistent-data lvm2 ~]# yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
三、安装、配置Master
1. 首先要在各服务器上执行以下命令安装软件包.(手动指定软件包版本是很不错的选择,刚开始没指定,默认会安装最新版的,最后你在国内找不到最新版的镜像才是最衰的,血淋淋的例子!.)
~]# yum -y install docker-ce
~]# yum -y install kubeadm-1.15.0 kubectl-1.15.0 kubelet-1.15.0
2. 启动docker
~]# systemctl start docker
3. 撰写(下载->改名->删除镜像)脚本(由于初始化需要下载镜像,但镜像都在外网,所以采用以下方法,脚本比较无脑,不过倒是能用,还是Python大法好,我本地没装Python3,没办法= =)
#!/bin/bash docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.0 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.0 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.0 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.0 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.0 k8s.gcr.io/kube-apiserver:v1.15.0 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.0 k8s.gcr.io/kube-controller-manager:v1.15.0 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.0 k8s.gcr.io/kube-scheduler:v1.15.0 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.0 k8s.gcr.io/kube-proxy:v1.15.0 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1 docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.0 docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.0 docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.0 docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.0 docker rmi registry.cn-hangzhou.aliyuncs.com/google
4. 编辑kubelet配置文件,增加忽略swap相关配置
注意:如果执行过kubeadm reset("恢复出厂设置")命令,则需要重新编辑此文件(因为我第一次初始化的时候出了问题,所以最后才发现默认此文件也恢复了.)
~]# vim /etc/sysconfig/kubelet KUBELET_EXTRA_ARGS="--fail-swap-on=false"
5. 开始初始化Master,初始化如果成功了的话呢,就会看到"successfully"字样,如果有问题则去看"/var/log/message"的日志;(记得保留初始化成功后的信息;)
# 建议添加"--apiserver-advertise-address"参数,指定Master的地址,我这里就傻了,没有指定,结果莫名其妙的给了我一个地址,我也不知道是什么鬼东西 ~]# kubeadm init --pod-network-cidr 10.244.0.0/16 --service-cidr 10.96.0.0/12 --ignore-preflight-errors=swap
可能出现的问题:
The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error:
这个问题,网上众说纷纷,有说没有在hosts文件里定义的,也有说要在cat /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf加东西的,其实就是因为swap内存的原因,当出现这个问题的时候回到第4步检查一下配置文件里是否还有添加的那条指令.
6. 配置网络(flannel),下面的命令是flannel官方提供的,只要是k8s1.7+版本以上的就可直接使用
~]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
7. 镜像打包传输至node节点
[Master节点操作] ~]# mkdir imgs
~]# docker save quay.io/coreos/flannel:v0.12.0-amd64 -o flannel.tar
~]# docker save k8s.gcr.io/kube-proxy:v1.15.0 -o kube-proxy.tar
~]# docker save k8s.gcr.io/pause:3.1 -o pause.tar
~]# mv *.tar imgs/
~]# scp -r imgs/ root@192.168.222.100:/root
8. Master上检查(为什么我下面突然变了用户,是当你初始化结束后要创建一个普通用户,并拷贝到home目录下,初始化成功后控制台有操作步骤)
# 检查一下集群状态,现在node节点还没有添加进来,所以只有这一条,而且你看的时候不一定是Ready状态(因为基于系统命名空间的一些Pod不一定都启动完成了)
[kubeadm@node1 ~]$ kubectl get nodes NAME STATUS ROLES AGE VERSION node1 Ready master 3h25m v1.15.0
# 检查一下系统级命名空间的pod是否已经启动成功,我有些pod分布在node2,node3上是因为我已经将他们加入集群了.
[kubeadm@node1 ~]$ kubectl get pods - n kube-system -o wide
# 查看控制器的状态,目前都是ok正常的,那么可以继续啦
[kubeadm@node1 ~]$ kubectl get cs
四、安装、配置各Node
各Node节点上的前三步与Master上的1、2、4步骤相同,此处不再过多演示
4. 将Node加入至cluster(这条命令在初始化了maser后会自动产生,直接copy过来即可,除了"--ignore-preflight-error=swap"需手动添加)
~]# kubeadm join 192.168.133.128:6443 --token u2pjqq.dxkbgfjtawmc7933 --discovery-token-ca-cert-hash \
sha256:520516b0ea9516f638ffdb5fdef8a50de5d0e14f1afc1b98e6c61d20f77fc8ac --ignore-preflight-errors=swap
5. 加载Master传过来的镜像,成功加入至集群后控制台也会打印一定信息,我记不住打啥了,然后加载镜像就ok.
~]# docker load -i /root/img/flannel.tar
~]# docker load -i /root/img/kube-proxy.tar
~]# docker load -i /root/img/pause.tar
~]# systemctl restart kubelet
五、回到Master检查集群状态及各Pod状态
~]$ kubectl get pods -n kube-system -o wide
~]$ kubectl get nodes
至此,Kubernetes集群搭建完成,谢谢大家观看!
标签:k8s,kubernetes,Kubernetes,v1.15,io,docker,kube,com,kubeadm 来源: https://www.cnblogs.com/k-free-bolg/p/12981968.html