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以数据为中心，代码服务于数据
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数据：对象
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代码：方法
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class:类
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属性，方法
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resource -> object
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method: GET ,PUT ,POST, DELETE, PATCH...
k8s:cluster,容器编排系统
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核心任务：容器编排
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容器：应用程序
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Pod Controller, Deployment
Kubernetes Network
部署要点
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测试环境
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可以使用单Master节点，单etcd实例；
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Node主机数量按需而定
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nfs或glusterfs等存储系统；
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生产环境
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高可用etcd集群，建立3、5或7个节点
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高可用Master
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kube-apiserver无状态，可多实例
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借助于keepalive进行vip流动实现多实例冗余；
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或在多实例前端通过HAProxy或Nginx反代，并借助keepalive对代理服务器进行冗余；
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kube-scheduler 及kube-controller-manager各自只能有一个活动实例，但可以有多个备用；
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各自自带leader选举的功能，并且默认处于启用状态；
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多Node主机，数量越多，冗余能力越强；
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ceph, glusterfs, iSCSI, FC SAN及各种云存储等；
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部署工具
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常用的部署环境
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IaaS公有云环境：AWS, GCE, Azure等
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IaaS私有云或公有云环境：OpenStack和vSphere等；
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Baremetal环境：物理服务器或独立的虚拟机等；
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常用的部署工具
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kubeadm
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kops
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kubespray
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Kontena Pharos
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...
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其他二次封装的常用发行版
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Rancher
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Tectonic
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Openshift
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...
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Master , Node
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Client -> Master(API Server)
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Registry:Docker Hub, gcr.io, quay.io
[root@iZ2vcdx512qke62ysebmttZ ~]# systemctl status chronyed
Unit chronyed.service could not be found.
[root@iZ2vcdx512qke62ysebmttZ ~]# date
Fri Jun 4 16:46:30 CST 2021
[root@iZ2vcdx512qke62ysebmttZ ~]# clear
[root@iZ2vcdx512qke62ysebmttZ ~]# systemctl stop firewalld
[root@iZ2vcdx512qke62ysebmttZ ~]# systemctl disable firewalld
[root@iZ2vcdx512qke62ysebmttZ ~]# sed -i \'s/enforcing/disabled/\' /etc/selinux/config
[root@iZ2vcdx512qke62ysebmttZ ~]# setenforce 0
setenforce: SELinux is disabled
[root@iZ2vcdx512qke62ysebmttZ ~]# swapoff -a
[root@iZ2vcdx512qke62ysebmttZ ~]# sed -ri \'s/.*swap.*/#&/\' /etc/fstab
[root@iZ2vcdx512qke62ysebmttZ ~]# hostnamectl set-hostname
Invalid number of arguments.
[root@iZ2vcdx512qke62ysebmttZ ~]# hostnamectl set-hostname master
[root@iZ2vcdx512qke62ysebmttZ ~]# cat >> /etc/hosts << EOF
> 47.109.19.74 master
> 47.109.21.242 node01
> 47.109.21.247 node02
> 47.109.23.91 node03
> EOF
[root@iZ2vcdx512qke62ysebmttZ ~]# cat > /etc/sysctl.d/k8s.conf << EOF
> net.bridge.bridge-nf-call-ip6tables = 1
> net.bridge.bridge-nf-call-iptables = 1
> EOF
[root@iZ2vcdx512qke62ysebmttZ ~]# sysctl --system
* Applying /usr/lib/sysctl.d/00-system.conf ...
* Applying /usr/lib/sysctl.d/10-default-yama-scope.conf ...
kernel.yama.ptrace_scope = 0
* Applying /usr/lib/sysctl.d/50-default.conf ...
kernel.sysrq = 16
kernel.core_uses_pid = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.promote_secondaries = 1
net.ipv4.conf.all.promote_secondaries = 1
fs.protected_hardlinks = 1
fs.protected_symlinks = 1
* Applying /etc/sysctl.d/99-sysctl.conf ...
vm.swappiness = 0
kernel.sysrq = 1
net.ipv4.neigh.default.gc_stale_time = 120
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_synack_retries = 2
* Applying /etc/sysctl.d/k8s.conf ...
* Applying /etc/sysctl.conf ...
vm.swappiness = 0
kernel.sysrq = 1
net.ipv4.neigh.default.gc_stale_time = 120
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_synack_retries = 2
[root@iZ2vcdx512qke62ysebmttZ ~]# yum install ntpdate -y
Loaded plugins: fastestmirror
Determining fastest mirrors
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/7): epel/x86_64/group_gz | 96 kB 00:00:00
(2/7): base/7/x86_64/group_gz | 153 kB 00:00:00
(3/7): epel/x86_64/updateinfo | 1.0 MB 00:00:00
(4/7): extras/7/x86_64/primary_db | 236 kB 00:00:00
(5/7): epel/x86_64/primary_db | 6.9 MB 00:00:00
(6/7): updates/7/x86_64/primary_db | 8.0 MB 00:00:00
(7/7): base/7/x86_64/primary_db | 6.1 MB 00:00:00
Resolving Dependencies
--> Running transaction check
---> Package ntpdate.x86_64 0:4.2.6p5-29.el7.centos.2 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
====================================================================================================================================================================================
Package Arch Version Repository Size
====================================================================================================================================================================================
Installing:
ntpdate x86_64 4.2.6p5-29.el7.centos.2 base 87 k
Transaction Summary
====================================================================================================================================================================================
Install 1 Package
Total download size: 87 k
Installed size: 121 k
Downloading packages:
ntpdate-4.2.6p5-29.el7.centos.2.x86_64.rpm | 87 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
Installing : ntpdate-4.2.6p5-29.el7.centos.2.x86_64