1 K8S 是什么
Kubernetes 是一款容器的编排调度工具，来源于 Google 开源的 Brog 系统。Kubernetes简称K8S，是用8代替8个字符 “ubernete” 而成的缩写，用于管理云平台中多个主机上的容器化的应用，Kubernetes 的目标是让部署容器化的应用简单并且高效，Kubernetes提供了应用部署，规划，更新，维护的一种机制。
集群中的各种角色
apiserver 所有服务访问的唯一入口，提供认证、授权、访问控制、API 注册和发现等机制
controller manager 负责维护集群的状态，比如副本期望数量、故障检测、自动扩展、滚动更新等
scheduler 负责资源的调度，按照预定的调度策略将 Pod 调度到相应的机器上
etcd 键值对数据库，保存了整个集群的状态
kubelet 负责维护容器的生命周期，同时也负责 Volume 和网络的管理
kube-proxy 负责为 Service 提供 cluster 内部的服务发现和负载均衡
Container runtime 负责镜像管理以及 Pod 和容器的真正运行
nginx 要调度到哪个工作节点呢？由scheduler监听API server发现有新的创建应用，通过API server 到 etcd 拿数据，然后 controller manager 确定哪个Node合适， 最后由API server指挥远程工作节点中的一个组件 Kubelet ，由 Kubelet 创建 pod：Kubelet 通过 cri-dockerd 操作 docker 创建 pod。
首先，将一个 K8s 比作一个集团，集团要做不同的项目，集群的各个角色就担任了不同的任务。
- Node：就是各个负责工作的地方也就是工厂。
- Kubelet：每一个工厂的负责人。
- k-proxy：每一个工厂的门卫，当总部的人要来巡视工厂了，可以通过它来询问当前的项目是不是在这开展，不管有没有在它这开展它都能告诉领导该去哪里查看。
- controller manager：决策者，决定项目由哪一个工厂来开展。
- API server：秘书部，决策者的决策不会直接告诉工厂而是通过它来进行转达，同样地，工厂的情况也是通过它来转给决策者。
- scheduler：调度者，调度项目的执行。
- etcd：资料库，用于存放集团的资料。
- 每一个服务器中要有一个监工：kubelet，由它来负责监控整个服务器里面容器的监控状况
- 所有的沟通都是通过秘书（api-server）
- 所有的服务器都要装上运行时环境，可以是docker。
- 可以通过命令的形式来进行部署
2 环境部署
1 ip规划：
vim /etc/hosts
192.168.21.20 kubernetes-master.inspur.com kubernetes-master
192.168.21.21 kubernetes-node1.inspur.com kubernetes-node1
192.168.21.22 kubernetes-node2.inspur.com kubernetes-node2
192.168.21.23 kubernetes-node3.inspur.com kubernetes-node3
192.168.21.24 kubernetes-register.inspur.com kubernetes-register
[root@inspur ~]# ssh-keygen -t rsa
[root@inspur ~]# ls .ssh/
id_rsa id_rsa.pub
[root@inspur ~]# for i in 20 21 22 23 24
> do
> ssh-copy-id root@192.168.21.$i
> done
[root@inspur ~]# for i in 20 21 22 23 24; do ssh root@192.168.21.$i "hostname"; done
inspur
inspur
inspur
inspur
inspur
[root@inspur ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
10.110.35.201 registrylibrary.com.cn
192.168.21.20 kubernetes-master.inspur.com kubernetes-master
192.168.21.21 kubernetes-node1.inspur.com kubernetes-node1
192.168.21.22 kubernetes-node2.inspur.com kubernetes-node2
192.168.21.23 kubernetes-node3.inspur.com kubernetes-node3
192.168.21.24 kubernetes-register.inspur.com kubernetes-register
[root@inspur ~]# hostnamectl set-hostname kubernetes-master
[root@inspur ~]# exec /bin/bash
[root@kubernetes-master ~]# hostname
kubernetes-master
[root@kubernetes-master ~]# ssh root@192.168.21.21 "hostnamectl set-hostname kubernetes-node1"
[root@kubernetes-master ~]# ssh root@192.168.21.22 "hostnamectl set-hostname kubernetes-node2"
[root@kubernetes-master ~]# ssh root@192.168.21.23 "hostnamectl set-hostname kubernetes-node3"
[root@kubernetes-master ~]# ssh root@192.168.21.24 "hostnamectl set-hostname kubernetes-register"
[root@kubernetes-master ~]# for i in 20 21 22 23 24; do ssh root@192.168.21.$i "hostname"; done
kubernetes-master
kubernetes-node1
kubernetes-node2
kubernetes-node3
kubernetes-register
2 不重启电脑，禁用启用swap，立刻生效
# 禁用命令
sudo swapoff -a
# 启用命令
sudo swapon -a
# 查看交换分区的状态
sudo free -m
[root@kubernetes-master ~]# vim /etc/sysctl.d/k8s.conf
[root@kubernetes-master ~]# cat /etc/sysctl.d/k8s.conf
vm.swappiness=0
3 网络参数调整
配置iptables参数，使得流经网桥的流量也经过iptables/netfilter防火墙
[root@kubernetes-master ~]# vim /etc/sysctl.d/k8s.conf
[root@kubernetes-master ~]# cat /etc/sysctl.d/k8s.conf
vm.swappiness=0
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1
配置生效
[root@kubernetes-master ~]# sudo modprobe overlay
[root@kubernetes-master ~]# sudo modprobe br_netfilter
[root@inspur ~]# sysctl -p /etc/sysctl.d/k8s.conf
4 容器环境配置
https://developer.aliyun.com/mirror/docker-ce?spm=a2c6h.13651102.0.0.3e221b11ixbXRM
dokcer的安装见之前的文章
systemctl enable docker
配置docker镜像加速器：
[root@kubernetes-master docker]# pwd
/etc/docker
[root@kubernetes-master docker]# cat daemon.json
{
"registry-mirrors": ["https://4zmn196h.mirror.aliyuncs.com",
"http://74f21445.m.daocloud.io",
"https://registry.docker-cn.com",
"http://hub-mirror.c.163.com",
"https://docker.mirrors.ustc.edu.cn"
],
"dns": ["8.8.8.8", "114.114.114.114"],
"insecure-registries": ["kubernetes-register.inspur.com"],
"exec-opts":[ "native.cgroupdriver=systemd"]
}
[root@kubernetes-master docker]#
5 cri环境操作
[root@kubernetes-master softs]# pwd
/data/softs
[root@kubernetes-master softs]# ll
total 0
[root@kubernetes-master softs]#
下载软件
[root@kubernetes-master softs]# wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.2/cri-dockerd-0.3.2.amd64.tgz
解压软件：
[root@kubernetes-master softs]# tar -zxvf cri-dockerd-0.3.2.amd64.tgz
[root@kubernetes-master system]# cd /usr/lib/systemd/system/
[root@kubernetes-master system]# chmod 777 cri-dockerd
配置启动文件：
/etc/systemd/system
[Unit]
Description=CRI Interface for Docker Application Container Engine
Documentation=https://docs.mirantis.com
After=network-online.target firewalld.service docker.service
Wants=network-online.target
[Service]
Type=notify
ExecStart=/usr/local/bin/cri-dockerd --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.9
--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin --container-runtime-endpoint=unix:///var/run/cri-dockerd.sock --cri-dockerd-root-directory=/var/lib/dockershim --docker-endpoint=unix:///var/run/docker.sock --cri-dockerd-root-directory=/var/lib/docker
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
StartLimitBurst=3
StartLimitInterval=60s
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TasksMax=infinity
Delegate=yes
KillMode=process
[Install]
WantedBy=multi-user.target
生成socket文件：
/etc/systemd/system
[Unit]
Description=CRI Docker socket for the API
PartOf=cri-docker.service
[Socket]
ListenStream=/var/run/cri-dockerd.sock
SocketMode=0660
SocketUser=root
SocketGroup=docker
[Install]
WantedBy=sockets.target
[root@kubernetes-master system]# cd /etc/systemd/system/
检查效果：
[root@kubernetes-master bin]# systemctl status cri-dockerd
systemctl is-active cri-dockerd
设置服务开机自启动：
[root@kubernetes-master bin]# systemctl daemon-reload
[root@kubernetes-master bin]# systemctl enable cri-dockerd.service
Created symlink from /etc/systemd/system/multi-user.target.wants/cri-dockerd.service to /etc/systemd/system/cri-dockerd.service.
[root@kubernetes-master bin]# systemctl restart cri-dockerd.service
[root@kubernetes-master bin]#
6 harbor仓库操作
下载软件：700M左右
wget https://github.com/goharbor/harbor/releases/download/v2.5.0/harbor-offline-installer-v2.5.0.tgz
curl -SL https://github.com/docker/compose/releases/download/v2.20.2/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose
mv docker-compose-linux-x86_64 /usr/local/bin/docker-compose
chmod +x docker-compose
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
docker-compose --version
[root@kubernetes-register softs]# tar -zxvf docker-compose-linux-x86_64
[root@kubernetes-register server]# pwd
/data/server
[root@kubernetes-register server]# ll
total 0
drwxr-xr-x. 2 root root 122 Aug 7 15:57 harbor
[root@kubernetes-register server]# cd harbor/
[root@kubernetes-register harbor]# ll
total 647720
-rw-r--r--. 1 root root 3361 Apr 7 2022 common.sh
-rw-r--r--. 1 root root 663227387 Apr 7 2022 harbor.v2.5.0.tar.gz
-rw-r--r--. 1 root root 9917 Apr 7 2022 harbor.yml.tmpl
-rwxr-xr-x. 1 root root 2500 Apr 7 2022 install.sh
-rw-r--r--. 1 root root 11347 Apr 7 2022 LICENSE
-rwxr-xr-x. 1 root root 1881 Apr 7 2022 prepare
[root@kubernetes-register harbor]#
[root@kubernetes-register harbor]# docker load < harbor.v2.5.0.tar.gz
修改配置文件：
[root@kubernetes-register harbor]# cp harbor.yml.tmpl harbor.yml
[root@kubernetes-register harbor]# vim harbor.yml
hostname: kubernetes-register.inspur.com
禁用https:
#https:
# https port for harbor, default is 443
# port: 443
# The path of cert and key files for nginx
#certificate: /your/certificate/path
#private_key: /your/private/key/path
harbor_admin_password: 123456
data_volume: /data/server/harbor/data
生成配置文件：
[root@kubernetes-register harbor]# ./prepare
prepare base dir is set to /data/server/harbor
WARNING:root:WARNING: HTTP protocol is insecure. Harbor will deprecate http protocol in the future. Please make sure to upgrade to https
Generated configuration file: /config/portal/nginx.conf
Generated configuration file: /config/log/logrotate.conf
Generated configuration file: /config/log/rsyslog_docker.conf
Generated configuration file: /config/nginx/nginx.conf
Generated configuration file: /config/core/env
Generated configuration file: /config/core/app.conf
Generated configuration file: /config/registry/config.yml
Generated configuration file: /config/registryctl/env
Generated configuration file: /config/registryctl/config.yml
Generated configuration file: /config/db/env
Generated configuration file: /config/jobservice/env
Generated configuration file: /config/jobservice/config.yml
Generated and saved secret to file: /data/secret/keys/secretkey
Successfully called func: create_root_cert
Generated configuration file: /compose_location/docker-compose.yml
Clean up the input dir
启动安装：
[root@kubernetes-register harbor]# ./install.sh
[root@kubernetes-register harbor]# docker compose ps
NAME IMAGE COMMAND SERVICE CREATED STATUS PORTS
harbor-core goharbor/harbor-core:v2.5.0 "/harbor/entrypoint.…" core 5 minutes ago Up 31 seconds (healthy)
harbor-db goharbor/harbor-db:v2.5.0 "/docker-entrypoint.…" postgresql 5 minutes ago Up 32 seconds (healthy)
harbor-jobservice goharbor/harbor-jobservice:v2.5.0 "/harbor/entrypoint.…" jobservice 5 minutes ago Up 29 seconds (health: starting)
harbor-log goharbor/harbor-log:v2.5.0 "/bin/sh -c /usr/loc…" log 5 minutes ago Up 4 minutes (healthy) 127.0.0.1:1514->10514/tcp
harbor-portal goharbor/harbor-portal:v2.5.0 "nginx -g 'daemon of…" portal 5 minutes ago Up 32 seconds (healthy)
nginx goharbor/nginx-photon:v2.5.0 "nginx -g 'daemon of…" proxy 5 minutes ago Up 29 seconds (health: starting) 0.0.0.0:80->8080/tcp, :::80->8080/tcp
redis goharbor/redis-photon:v2.5.0 "redis-server /etc/r…" redis 5 minutes ago Up 32 seconds (healthy)
registry goharbor/registry-photon:v2.5.0 "/home/harbor/entryp…" registry 5 minutes ago Up 32 seconds (healthy)
registryctl goharbor/harbor-registryctl:v2.5.0 "/home/harbor/start.…" registryctl 5 minutes ago Up 32 seconds (healthy)
[root@kubernetes-register harbor]#
有一个问题：
下线处理：
[root@kubernetes-register harbor]# docker-compose down
[+] Running 10/10
✔ Container harbor-jobservice Removed 2.1s
✔ Container nginx Removed 2.1s
✔ Container registryctl Removed 10.4s
✔ Container harbor-portal Removed 0.6s
✔ Container harbor-core Removed 0.6s
✔ Container registry Removed 0.4s
✔ Container redis Removed 0.5s
✔ Container harbor-db Removed 0.5s
✔ Container harbor-log Removed 10.1s
✔ Network harbor_harbor Removed
定制服务启动文件：
[root@kubernetes-register system]# pwd
/etc/systemd/system
[Unit]
Description=Harbor
After=docker.service systemd-networkd.service systemd-resolved.service
Requires=docker.service
Documentation=http://github.com/vmware/harbor
[Service]
Type=simple
Restart=on-failure
RestartSec=5
ExecStart=/usr/bin/docker-compose --file /data/server/harbor/docker-compose.yml upExecStop=/usr/bin/docker-compose --file /data/server/harbor/docker-compose.yml down
[Install]
WantedBy=multi-user.target
[root@kubernetes-register ~]# cd /data/server/harbor/
[root@kubernetes-register harbor]# docker-compose ps
NAME IMAGE COMMAND SERVICE CREATED STATUS PORTS
harbor-core goharbor/harbor-core:v2.5.0 "/harbor/entrypoint.…" core 2 minutes ago Up 2 minutes (healthy)
harbor-db goharbor/harbor-db:v2.5.0 "/docker-entrypoint.…" postgresql 2 minutes ago Up 2 minutes (healthy)
harbor-jobservice goharbor/harbor-jobservice:v2.5.0 "/harbor/entrypoint.…" jobservice 2 minutes ago Up 2 minutes (healthy)
harbor-log goharbor/harbor-log:v2.5.0 "/bin/sh -c /usr/loc…" log 2 minutes ago Up 2 minutes (healthy) 127.0.0.1:1514->10514/tcp
harbor-portal goharbor/harbor-portal:v2.5.0 "nginx -g 'daemon of…" portal 2 minutes ago Up 2 minutes (healthy)
nginx goharbor/nginx-photon:v2.5.0 "nginx -g 'daemon of…" proxy 2 minutes ago Up 2 minutes (healthy) 0.0.0.0:80->8080/tcp, :::80->8080/tcp
redis goharbor/redis-photon:v2.5.0 "redis-server /etc/r…" redis 2 minutes ago Up 2 minutes (healthy)
registry goharbor/registry-photon:v2.5.0 "/home/harbor/entryp…" registry 2 minutes ago Up 2 minutes (healthy)
registryctl goharbor/harbor-registryctl:v2.5.0 "/home/harbor/start.…" registryctl 2 minutes ago Up 2 minutes (healthy)
[root@kubernetes-register harbor]#
创建一个用户：
Inspur930312043@qq.com
用自己的账号登录并创建一个项目：
[root@kubernetes-master ~]# docker tag nginx:latest kubernetes-register.inspur.com/inspur/nginx:2.22.01
[root@kubernetes-master ~]# docker tag tomcat:latest kubernetes-register.inspur.com/inspur/tomcat:11.1.01
上传镜像到私有仓库：
[root@kubernetes-master ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx latest 605c77e624dd 19 months ago 141MB
kubernetes-register.inspur.com/inspur/nginx 2.22.01 605c77e624dd 19 months ago 141MB
tomcat latest fb5657adc892 19 months ago 680MB
kubernetes-register.inspur.com/inspur/tomcat 11.1.01 fb5657adc892 19 months ago 680MB
[root@kubernetes-master ~]# docker login kubernetes-register.inspur.com
Username: inspur
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
[root@kubernetes-master ~]# docker push kubernetes-register.inspur.com/inspur/tomcat:11.1.01
The push refers to repository [kubernetes-register.inspur.com/inspur/tomcat]
3e2ed6847c7a: Pushed
bd2befca2f7e: Pushed
59c516e5b6fa: Pushed
3bb5258f46d2: Pushed
832e177bb500: Pushed
f9e18e59a565: Pushed
26a504e63be4: Pushed
8bf42db0de72: Pushed
31892cc314cb: Pushed
11936051f93b: Pushed
11.1.01: digest: sha256:e6d65986e3b0320bebd85733be1195179dbce481201a6b3c1ed27510cfa18351 size: 2422
[root@kubernetes-master ~]# docker push kubernetes-register.inspur.com/inspur/nginx:2.22.01
The push refers to repository [kubernetes-register.inspur.com/inspur/nginx]
d874fd2bc83b: Pushed
32ce5f6a5106: Pushed
f1db227348d0: Pushed
b8d6e692a25e: Pushed
e379e8aedd4d: Pushed
2edcec3590a4: Pushed
2.22.01: digest: sha256:ee89b00528ff4f02f2405e4ee221743ebc3f8e8dd0bfd5c4c20a2fa2aaa7ede3 size: 1570
[root@kubernetes-master ~]#
拉取镜像：
[root@kubernetes-register harbor]# docker pull kubernetes-register.inspur.com/inspur/tomcat@sha256:e6d65986e3b0320bebd85733be1195179dbce481201a6b3c1ed27510cfa18351
kubernetes-register.inspur.com/inspur/tomcat@sha256:e6d65986e3b0320bebd85733be1195179dbce481201a6b3c1ed27510cfa18351: Pulling from inspur/tomcat
Digest: sha256:e6d65986e3b0320bebd85733be1195179dbce481201a6b3c1ed27510cfa18351
Status: Image is up to date for kubernetes-register.inspur.com/inspur/tomcat@sha256:e6d65986e3b0320bebd85733be1195179dbce481201a6b3c1ed27510cfa18351
kubernetes-register.inspur.com/inspur/tomcat@sha256:e6d65986e3b0320bebd85733be1195179dbce481201a6b3c1ed27510cfa18351
[root@kubernetes-register harbor]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
goharbor/harbor-exporter v2.5.0 36396f138dfb 16 months ago 86.7MB
goharbor/chartmuseum-photon v2.5.0 eaedcf1f700b 16 months ago 225MB
goharbor/redis-photon v2.5.0 1e00fcc9ae63 16 months ago 156MB
goharbor/trivy-adapter-photon v2.5.0 4e24a6327c97 16 months ago 164MB
goharbor/notary-server-photon v2.5.0 6d5fe726af7f 16 months ago 112MB
goharbor/notary-signer-photon v2.5.0 932eed8b6e8d 16 months ago 109MB
goharbor/harbor-registryctl v2.5.0 90ef6b10ab31 16 months ago 136MB
goharbor/registry-photon v2.5.0 30e130148067 16 months ago 77.5MB
goharbor/nginx-photon v2.5.0 5041274b8b8a 16 months ago 44MB
goharbor/harbor-log v2.5.0 89fd73f9714d 16 months ago 160MB
goharbor/harbor-jobservice v2.5.0 1d097e877be4 16 months ago 226MB
goharbor/harbor-core v2.5.0 42a54bc05b02 16 months ago 202MB
goharbor/harbor-portal v2.5.0 c206e936f4f9 16 months ago 52.3MB
goharbor/harbor-db v2.5.0 d40a1ae87646 16 months ago 223MB
goharbor/prepare v2.5.0 36539574668f 16 months ago 268MB
tomcat latest fb5657adc892 19 months ago 680MB
kubernetes-register.inspur.com/inspur/tomcat 11.1.01 fb5657adc892 19 months ago 680MB
7 K8s集群初始化
配置阿里云镜像：
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
setenforce 0
软件安装：
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet
[root@kubernetes-master ~]# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"27", GitVersion:"v1.27.4", GitCommit:"fa3d7990104d7c1f16943a67f11b154b71f6a132", GitTreeState:"clean", BuildDate:"2023-07-19T12:19:40Z", GoVersion:"go1.20.6", Compiler:"gc", Platform:"linux/amd64"}
[root@kubernetes-master ~]# kubeadm config images list
registry.k8s.io/kube-apiserver:v1.27.4
registry.k8s.io/kube-controller-manager:v1.27.4
registry.k8s.io/kube-scheduler:v1.27.4
registry.k8s.io/kube-proxy:v1.27.4
registry.k8s.io/pause:3.9
registry.k8s.io/etcd:3.5.7-0
registry.k8s.io/coredns/coredns:v1.10.1
[root@kubernetes-master ~]# kubeadm config list | awk -F '/' '{print $NF}'
invalid subcommand "list"
See 'kubeadm config -h' for help and examples
[root@kubernetes-master ~]# kubeadm config images list | awk -F '/' '{print $NF}'
kube-apiserver:v1.27.4
kube-controller-manager:v1.27.4
kube-scheduler:v1.27.4
kube-proxy:v1.27.4
pause:3.9
etcd:3.5.7-0
coredns:v1.10.1
images=$(kubeadm config images list --kubernetes-version=1.27.4 | awk -F "/" '{print $NF}')
for i in ${images}
do
docker pull registry.aliyuncs.com/google_containers/$i
docker tag registry.aliyuncs.com/google_containers/$i kubernetes-register.inspur.com/google_containers/$i
docker push kubernetes-register.inspur.com/google_containers/$i
docker rmi registry.aliyuncs.com/google_containers/$i
done
环境初始化：
[root@kubernetes-master ~]# kubeadm init --kubernetes-version=1.27.4 --apiserver-advertise-address=192.168.21.20 --image-repository=kubernetes-register.inspur.com/google_containers --pod-network-cidr="172.17.1.0/16" --service-cidr="10.96.0.0/12" --ignore-preflight-errors=Swap --cri-socket=unix:///var/run/cri-dockerd.sock
分别在node1 node2 node3 执行
kubeadm join 192.168.21.20:6443 --token ymlg0w.xkl1z4pr7dwg39yr --discovery-token-ca-cert-hash sha256:ec15cba4c2e6bf2291ff1217f4e9bd41ee28aa02139e6fc86e614a5b8c6f4b96 --cri-socket=unix:///var/run/cri-dockerd.sock
但是现在还是有一个问题：
运行如下命令：
[root@kubernetes-master ~]# mkdir -p $HOME/.kube
[root@kubernetes-master ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@kubernetes-master ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
[root@kubernetes-master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
kubernetes-master NotReady control-plane 5m8s v1.27.4
kubernetes-node1 NotReady <none> 2m56s v1.27.4
kubernetes-node2 NotReady <none> 2m46s v1.27.4
kubernetes-node3 NotReady <none> 2m44s v1.27.4
[root@kubernetes-master ~]#
命令补全：
source <(kubectl completion bash)
source <(kubeadm completion bash)
[root@kubernetes-master ~]# vim .bashrc
[root@kubernetes-master ~]# cat .bashrc
# .bashrc
# User specific aliases and functions
alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
source <(kubectl completion bash)
source <(kubeadm completion bash)
[root@kubernetes-master ~]# source .bashrc
[root@kubernetes-master ~]# kubectl get n
namespaces networkpolicies.networking.k8s.io nodes
[root@kubernetes-master ~]# kubectl get n
namespaces networkpolicies.networking.k8s.io nodes
[root@kubernetes-master ~]# kubectl get n
网络配置：
https://kubernetes.io/docs/concepts/cluster-administration/addons/
[root@kubernetes-master flannel]# pwd
/data/kubernetes/network/flannel
[root@kubernetes-master flannel]# ll
total 16
-rw-r--r--. 1 root root 4459 Aug 8 09:42 kube-flannel.yml
-rw-r--r--. 1 root root 4459 Aug 8 09:42 kube-flannel.ymlBK
[root@kubernetes-master flannel]#
需要下载一下三个镜像文件：
[root@kubernetes-master flannel]# grep image: kube-flannel.yml
image: docker.io/flannel/flannel:v0.22.1
image: docker.io/flannel/flannel-cni-plugin:v1.2.0
image: docker.io/flannel/flannel:v0.22.1
[root@kubernetes-master flannel]# docker tag flannel/flannel:v0.22.1 kubernetes-register.inspur.com/inspur/flannel/flannel:v0.22.1
[root@kubernetes-master flannel]# docker tag flannel/flannel-cni-plugin:v1.2.0 kubernetes-register.inspur.com/inspur/flannel/flannel-cni-plugin:v1.2.0
推送到远程私有仓库：
[root@kubernetes-master flannel]# docker push kubernetes-register.inspur.com/inspur/flannel/flannel:v0.22.1
The push refers to repository [kubernetes-register.inspur.com/inspur/flannel/flannel]
c120dc707e2b: Pushed
92e727b491c6: Pushed
23d8410e16ff: Pushed
9726974aad9b: Pushed
117eda391951: Pushed
40afc0fa6094: Pushed
d8ddfa4843bd: Pushed
f1417ff83b31: Pushed
v0.22.1: digest: sha256:02cb1205742b0d087f89d654cbe5fa8f815e97e4e5cc86c7f39bd7933d1a04cb size: 1996
[root@kubernetes-master flannel]# docker push kubernetes-register.inspur.com/inspur/flannel/flannel-cni-plugin:v1.2.0
The push refers to repository [kubernetes-register.inspur.com/inspur/flannel/flannel-cni-plugin]
9332f71f5f3d: Pushed
7df5bd7bd262: Pushed
v1.2.0: digest: sha256:2180bb74f60bea56da2e9be2004271baa6dccc0960b7aeaf43a97fc4de9b1ae0 size: 739
[root@kubernetes-master flannel]#
修改yml文件：
[root@kubernetes-master flannel]# kubectl apply -f kube-flannel.yml
namespace/kube-flannel created
serviceaccount/flannel created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
configmap/kube-flannel-cfg created
daemonset.apps/kube-flannel-ds created
[root@kubernetes-master flannel]#
查看namespace：
[root@kubernetes-master flannel]# kubectl get ns
NAME STATUS AGE
default Active 34m
kube-flannel Active 53s
kube-node-lease Active 34m
kube-public Active 34m
kube-system Active 34m
[root@kubernetes-master flannel]#
[root@kubernetes-master flannel]# kubectl get pod -n kube-flannel
NAME READY STATUS RESTARTS AGE
kube-flannel-ds-mdpkb 0/1 CrashLoopBackOff 4 (29s ago) 2m33s
kube-flannel-ds-pg4x6 0/1 CrashLoopBackOff 4 (44s ago) 2m33s
kube-flannel-ds-vjw5j 0/1 CrashLoopBackOff 4 (40s ago) 2m33s
kube-flannel-ds-wzwx9 0/1 CrashLoopBackOff 4 (41s ago) 2m33s
[root@kubernetes-master flannel]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
kubernetes-master Ready control-plane 36m v1.27.4
kubernetes-node1 Ready <none> 34m v1.27.4
kubernetes-node2 Ready <none> 34m v1.27.4
kubernetes-node3 Ready <none> 34m v1.27.4
[root@kubernetes-master flannel]#
[root@kubernetes-master flannel]# systemctl is-active kubelet cri-dockerd docker
active
active
active
[root@kubernetes-master flannel]# systemctl enable kubelet cri-dockerd docker
8 应用部署
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