阅读目录
1.k8s集群的安装
1.1k8s集群架构：
master节点：etcd，api-server,scheduler,controller-manager
node节点：kubelet,kube-proxy
etcd的作用：数据库
api-server：核心服务
controller-manager：控制器控制rc
scheduler：创建新pod，选择合适的节点
kubelet：调用docker来创建容器
kube-proxy:对外提供用户访问，对内提供一个负载均衡器
1.6所有节点配置flannel网络
作用：跨节点容器间的通信
a.安装etcd
b.安装配置flannel
c.重启docker生效
1.7配置master为docker镜像私有仓库
a.速度快
b.保护隐私
2.什么是k8s,k8s有什么功能？
2.1k8s的核心功能
自愈：当pod挂了的时候会自动重启
弹性伸缩：
服务自动发现和负载均衡：
滚动升级和一键回滚：
密码和配置文件管理：
2.2k8s历史
2.3k8s的安装方式
yum
源码编译（极不推荐）
二进制 生产使用
kubeadm 生产使用
3.k8s常用资源
3.1创建pod资源
k8s最小资源单位
pod资源至少包含两个容器，基础容器pod+业务容器
3.2ReplictionController资源
保证指定数量的pod运行
pod和rc是通过标签来关联
rc滚动升级和一键回滚
1.k8s安装
1.1：修改IP地址，主机和host解析
所有节点需要做hosts解析
10.0.0.11 master
10.0.0.12 node-1
10.0.0.13 node-2
1.2：master节点安装etcd
[root@master ~]# yum install etcd -y
[root@master ~]# vim /etc/hosts
[root@master ~]# vim /etc/hosts
10.0.0.11 master
10.0.0.12 node-1
10.0.0.13 node-2
[root@master ~]# systemctl restart network
[root@master ~]# vim /etc/etcd/etcd.conf
6行：ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
21行：ETCD_ADVERTISE_CLIENT_URLS="http://10.0.0.11:2379"
.......
[root@master ~]# systemctl start etcd.service
[root@master ~]# systemctl enable etcd.service
Created symlink from /etc/systemd/system/multi-user.target.wants/etcd.service to /usr/lib/systemd/system/etcd.service.
[root@master ~]# netstat -lntup
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:2380 0.0.0.0:* LISTEN 7390/etcd
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 6726/sshd
tcp6 0 0 :::2379 :::* LISTEN 7390/etcd
tcp6 0 0 :::22 :::* LISTEN 6726/sshd
udp 0 0 127.0.0.1:323 0.0.0.0:* 5065/chronyd
udp6 0 0 ::1:323 :::* 5065/chronyd
### 测试etcd是否安装成功
[root@master ~]# etcdctl set testdir/testkey0 0
0
[root@master ~]# etcdctl get testdir/testkey0
0
### 检查健康状态
[root@master ~]# etcdctl -C http://10.0.0.11:2379 cluster-health
member 8e9e05c52164694d is healthy: got healthy result from http://10.0.0.11:2379
cluster is healthy
1.4：master节点安装kubernets-master
[root@master ~]# yum install kubernetes-master.x86_64 -y
[root@master ~]# vim /etc/kubernetes/apiserver
......
8行: KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
11行：KUBE_API_PORT="--port=8080"
17行：KUBE_ETCD_SERVERS="--etcd-servers=http://10.0.0.11:2379"
23行：此处是一行
KUBE_ADMISSION_CONTROL="--admissioncontrol=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
......
[root@master ~]# vim /etc/kubernetes/config
......
22行：KUBE_MASTER="--master=http://10.0.0.11:8080"
......
[root@master ~]# systemctl enable kube-apiserver.service
[root@master ~]# systemctl restart kube-apiserver.service
[root@master ~]# systemctl enable kube-controller-manager.service
[root@master ~]# systemctl restart kube-controller-manager.service
[root@master ~]# systemctl enable kube-scheduler.service
[root@master ~]# systemctl restart kube-scheduler.service
检查服务是否安装正常
[root@k8s-master ~]# kubectl get componentstatus
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health":"true"}
1.5：node节点安装kubernetes-node
[root@node-1 ~]# yum install kubernetes-node.x86_64 -y
[root@node-1 ~]# vim /etc/kubernetes/config
......
22行：KUBE_MASTER="--master=http://10.0.0.11:8080"
......
[root@node-1 ~]# vim /etc/kubernetes/kubelet
......
5行：KUBELET_ADDRESS="--address=0.0.0.0"
8行：KUBELET_PORT="--port=10250"
11行：KUBELET_HOSTNAME="--hostname-override=10.0.0.12"
14行：KUBELET_API_SERVER="--api-servers=http://10.0.0.11:8080"
......
[root@node-1 ~]# systemctl enable kubelet.service
[root@node-1 ~]# systemctl start kubelet.service
[root@node-1 ~]# systemctl enable kube-proxy.service
[root@node-1 ~]# systemctl start kube-proxy.service
在master节点检查
[root@k8s-master ~]# kubectl get nodes
NAME STATUS AGE
10.0.0.12 Ready 6m
10.0.0.13 Ready 3s
1.6所有节点配置flannel网络
### 所有节点安装
[root@master ~]# yum install flannel -y
[root@master ~]# sed -i 's#http://127.0.0.1:2379#http://10.0.0.11:2379#g' /etc/sysconfig/flanneld
[root@node-1 ~]# yum install flannel -y
[root@node-1 ~]# ]# sed -i 's#http://127.0.0.1:2379#http://10.0.0.11:2379#g' /etc/sysconfig/flanneld
[root@node-2 ~]# yum install flannel -y
[root@node-2 ~]# sed -i 's#http://127.0.0.1:2379#http://10.0.0.11:2379#g' /etc/sysconfig/flanneld ##master节点操作：
[root@master ~]# etcdctl mk /atomic.io/network/config '{ "Network": "172.16.0.0/16" }'
[root@master ~]# yum install docker -y
[root@master ~]# systemctl enable flanneld.service
[root@master ~]# systemctl restart flanneld.service
[root@master ~]# systemctl restart docker
[root@master ~]# systemctl enable docker
[root@master ~]# systemctl restart kube-apiserver.service
[root@master ~]# systemctl restart kube-controller-manager.service
[root@master ~]# systemctl restart kube-scheduler.service ###所有节点都上传
[root@master ~]# rz docker_busybox.tar.gz
[root@master ~]# docker load -i docker_busybox.tar.gz
adab5d09ba79: Loading layer [==================================================>] 1.416 MB/1.416 MB Loaded image: docker.io/busybox:latest
###所有机器都运行docker容器
[root@master ~]# docker run -it docker.io/busybox:latest
/ # ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:AC:10:43:02 inet addr:172.16.67.2 Bcast:0.0.0.0 Mask:255.255.255.0 inet6 addr: fe80::42:acff:fe10:4302/64 Scope:Link
/ # ping 172.16.67.2
64 bytes from 172.16.67.2: seq=0 ttl=64 time=0.127 ms
64 bytes from 172.16.67.2: seq=1 ttl=64 time=0.062 ms
##node节点：node-1 node-2
[root@node-1 ~]# systemctl enable flanneld.service
[root@node-1 ~]# systemctl restart flanneld.service
[root@node-1 ~]# service docker restart
[root@node-1 ~]# systemctl restart kubelet.service
[root@node-1 ~]# systemctl restart kube-proxy.service ###所有节点启动docker node-1 node-2都部署
[root@node-1 ~]# vim /usr/lib/systemd/system/docker.service
#在[Service]区域下增加一行
......
[Service] ExecStartPost=/usr/sbin/iptables -P FORWARD ACCEPT
......
systemctl daemon-reload
systemctl restart docker
参考地址：https://www.cnblogs.com/wangyongqiang/articles/12564373.html
来源：oschina
链接：https://my.oschina.net/u/3966437/blog/4492106