@chensiqi 2021-06-04T06:33:32.000000Z 字数 26556 阅读 1950

容器自动化（十）：K8S容器云平台入门（下）

云计算专题之容器自动化

--私人课件，不公开，不出版，禁止传播

想做好运维工作，人先要学会勤快；
居安而思危，勤记而补拙，方可不断提高；
别人资料不论你用着再如何爽那也是别人的；
自己总结东西是你自身特有的一种思想与理念的展现；
精髓不是看出来的，精髓是记出来的；
请同学们在学习的过程中养成好的学习习惯；
勤于实践，抛弃教案，勤于动手，整理文档。

第二章 Kubernetes生产级高可用集群部署

角色	IP	组件	推荐配置
master01	192.168.200.207	kube-apiserver/kube-controller-manager/kube-scheduler/etcd	CPU:2C+ 内存：4G+
master02	192.168.200.208	kube-apiserver/kube-controller-manager/kube-scheduler/etcd	CPU:2C+ 内存：4G+
node01	192.168.200.209	kubelet/kube-proxy/docker/flannel/etcd	CPU:2C+ 内存：4G+
node02	192.168.200.210	kubelet/kube-proxy/docker/flannel	CPU:2C+ 内存：4G+
Load_Balancer_Master	192.168.200.205，VIP：192.168.200.100	Nginx L4	CPU:2C+ 内存：4G+
Load_Balancer_Backup	192.168.200.206	Nginx L4	CPU:2C+ 内存：4G+
Registry_Harbor	192.168.200.211	Harbor	CPU:2C+ 内存：4G+

QQ截图20190322214408.png-82.6kB

2.11 多master集群-部署Master02组件

假如我们要在Master01的基础上创建Master02，只需要进行以下几步操作

2.11.1 拷贝Master01上/opt/kubernetes目录所有内容到Master02的/opt下

[root@Master01 ~]# scp -r /opt/kubernetes/ root@192.168.200.208:/opt/
root@192.168.200.208s password: 
kube-apiserver                                                                             100%  184MB 103.7MB/s   00:01    
kubectl                                                                                    100%   55MB 100.9MB/s   00:00    
kube-controller-manager                                                                    100%  155MB  92.6MB/s   00:01    
kube-scheduler                                                                             100%   55MB 100.2MB/s   00:00    
token.csv                                                                                  100%   84    67.0KB/s   00:00    
kube-apiserver                                                                             100%  958   818.7KB/s   00:00    
kube-controller-manager                                                                    100%  483     1.2MB/s   00:00    
kube-scheduler                                                                             100%   93    44.1KB/s   00:00    
ca.pem                                                                                     100% 1359     3.3MB/s   00:00    
server-key.pem                                                                             100% 1675     3.6MB/s   00:00    
server.pem                                                                                 100% 1643     3.1MB/s   00:00    
ca-key.pem                                                                                 100% 1679     3.3MB/s   00:00

2.11.2 拷贝Master01上的systemd管理的启动脚本到Master02上

[root@Master01 ~]# cd /usr/lib/systemd/system
[root@Master01 system]# pwd
/usr/lib/systemd/system
[root@Master01 system]# ls kube-apiserver.service kube-scheduler.service kube-controller-manager.service 
kube-apiserver.service  kube-controller-manager.service  kube-scheduler.service
[root@Master01 system]# scp kube-apiserver.service kube-controller-manager.service kube-scheduler.service root@192.168.200.208:/usr/lib/systemd/system/
root@192.168.200.208s password: 
kube-apiserver.service                                                                     100%  282   645.3KB/s   00:00    
kube-controller-manager.service                                                            100%  317   457.8KB/s   00:00    
kube-scheduler.service                                                                     100%  282   670.3KB/s   00:00

2.11.3 在Master02上修改刚才拷贝的kube-apiserver文件里涉及到IP地址部分的代码

#修改kube-apiserver配置文件
[root@Master02 ~]# cd /opt/kubernetes/
[root@Master02 kubernetes]# cd cfg/
[root@Master02 cfg]# sed -n '5p;7p' kube-apiserver 
--bind-address=192.168.200.207 \        #本行修改为本地IP
--advertise-address=192.168.200.207 \   #本行修改为本地IP
[root@Master02 cfg]# vim kube-apiserver +5
[root@Master02 cfg]# sed -n '5p;7p' kube-apiserver 
--bind-address=192.168.200.208 \
--advertise-address=192.168.200.208 \

2.11.4 启动Master02的各个组件服务，并设置开机自动启动

#启动kube-apiserver服务
[root@Master02 ~]# systemctl start kube-apiserver
[root@Master02 ~]# systemctl enable kube-apiserver
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-apiserver.service to /usr/lib/systemd/system/kube-apiserver.service.
#验证apiserver服务是否启动成功
[root@Master02 ~]# ps -ef | grep kube-apiserver | grep -v grep
root       1702      1 26 19:51 ?        00:00:07 /opt/kubernetes/bin/kube-apiserver --logtostderr=true --v=4 --etcd-servers=https://192.168.200.207:2379,https://192.168.200.208:2379,https://192.168.200.209:2379 --bind-address=192.168.200.208 --secure-port=6443 --advertise-address=192.168.200.208 --allow-privileged=true --service-cluster-ip-range=10.0.0.0/24 --enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction --authorization-mode=RBAC,Node --kubelet-https=true --enable-bootstrap-token-auth --token-auth-file=/opt/kubernetes/cfg/token.csv --service-node-port-range=30000-50000 --tls-cert-file=/opt/kubernetes/ssl/server.pem --tls-private-key-file=/opt/kubernetes/ssl/server-key.pem --client-ca-file=/opt/kubernetes/ssl/ca.pem --service-account-key-file=/opt/kubernetes/ssl/ca-key.pem --etcd-cafile=/opt/etcd/ssl/ca.pem --etcd-certfile=/opt/etcd/ssl/server.pem --etcd-keyfile=/opt/etcd/ssl/server-key.pem
#启动kube-scheduler服务
[root@Master02 ~]# systemctl start kube-scheduler
[root@Master02 ~]# systemctl enable kube-scheduler
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.
#验证kube-scheduler服务是否启动成功
[root@Master02 ~]# ps -ef | grep kube-scheduler | grep -v grep
root       1739      1  0 19:53 ?        00:00:00 /opt/kubernetes/bin/kube-scheduler --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect
#启动kube-controller-manager服务
[root@Master02 ~]# systemctl start kube-controller-manager
[root@Master02 ~]# systemctl enable kube-controller-manager
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service to /usr/lib/systemd/system/kube-controller-manager.service.
#验证kube-controller-manager是否启动成功
[root@Master02 ~]# ps -ef | grep kube-controller-manager | grep -v grep
root       1777      1  5 19:54 ?        00:00:00 /opt/kubernetes/bin/kube-controller-manager --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect=true --address=127.0.0.1 --service-cluster-ip-range=10.10.10.0/24 --cluster-name=kubernetes --cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem --cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem --root-ca-file=/opt/kubernetes/ssl/ca.pem --service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem --experimental-cluster-signing-duration=87600h0m0s

2.11.5 在Master02上进行集群状态检查

[root@Master02 ~]# ln -s /opt/kubernetes/bin/kubectl /usr/local/bin/
[root@Master02 ~]# which kubectl
/usr/local/bin/kubectl
[root@Master02 ~]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-1               Healthy   {"health":"true"}   
etcd-0               Healthy   {"health":"true"}   
etcd-2               Healthy   {"health":"true"}   
[root@Master02 ~]# kubectl get node
NAME              STATUS   ROLES    AGE   VERSION
192.168.200.209   Ready    <none>   12d   v1.12.1
192.168.200.210   Ready    <none>   11d   v1.12.1

2.12 多master集群-Nginx+keepalived（高可用）

Nginx很常用，而且现在的Yum安装版的配置很全，已经无需源码编译
而且，从1.9.10版本开始，Nginx在编译时只需要加上--with-stream，即可支持四层负载均衡
那么，我们如何从官网找到我们需要的yum安装源呢？
http://nginx.org

1.png-90.2kB

2.png-70.5kB

3.png-65.2kB

4.png-59.7kB

需要注意的是，Yum源代码里的$releaserver需要修改成我们用的操作系统的版本，我们用Centos7那么就写7即可。

2.12.1 Yum安装Nginx

#配置Nginx的Yum源文件
[root@LB-Nginx-Master ~]# vim /etc/yum.repos.d/nginx.repo
[root@LB-Nginx-Master ~]# cat /etc/yum.repos.d/nginx.repo
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
enabled=1
#Yum安装Nginx
[root@LB-Nginx-Master ~]# yum -y install nginx

2.12.2 修改Nginx配置文件


#修改一下配置文件的参数，添加stream负载均衡池
#配置文件修改后的结果如下所示：
[root@LB-Nginx-Master ~]# cat /etc/nginx/nginx.conf
user  nginx;
worker_processes  4;            #修改一下processes
error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;
events {
    worker_connections  1024;
}
stream {                                #添加一个stream四层负载均衡池
    upstream k8s-apiserver {
     server 192.168.200.207:6443;
     server 192.168.200.208:6443;
    }
    server {
         listen 192.168.200.205:6443;   #模拟监听的本地端口
         proxy_pass k8s-apiserver;      #因为四层所以这里不是URL，请同学们注意
    }
}
http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    access_log  /var/log/nginx/access.log  main;
    sendfile        on;
    #tcp_nopush     on;
    keepalive_timeout  65;
    #gzip  on;
    include /etc/nginx/conf.d/*.conf;
}

2.12.3 启动Nginx

[root@LB-Nginx-Master ~]# systemctl start nginx
[root@LB-Nginx-Master ~]# ps -ef | grep nginx | grep -v grep
root      21840      1  0 21:03 ?        00:00:00 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
nginx     21841  21840  0 21:03 ?        00:00:00 nginx: worker process
nginx     21842  21840  0 21:03 ?        00:00:00 nginx: worker process
nginx     21843  21840  0 21:03 ?        00:00:00 nginx: worker process
nginx     21844  21840  0 21:03 ?        00:00:00 nginx: worker process
[root@LB-Nginx-Master ~]# netstat -antp | grep 6443
tcp        0      0 192.168.200.205:6443    0.0.0.0:*               LISTEN      21840/nginx: master

2.12.4 修改Node节点的组件配置文件，将指向Master的IP地址，指向LB-Nginx（目前没有做VIP）

#修改Node01节点配置文件
[root@node01 cfg]# pwd
/opt/kubernetes/cfg
[root@node01 cfg]# grep 207 *
bootstrap.kubeconfig:    server: https://192.168.200.207:6443   #修改这个文件
flanneld:FLANNEL_OPTIONS="--etcd-endpoints=https://192.168.200.207:2379,https://192.168.200.208:2379,https://192.168.200.209:2379 -etcd-cafile=/opt/etcd/ssl/ca.pem -etcd-certfile=/opt/etcd/ssl/server.pem -etcd-keyfile=/opt/etcd/ssl/server-key.pem"
kubelet.kubeconfig:    server: https://192.168.200.207:6443 #修改这个文件
kube-proxy.kubeconfig:    server: https://192.168.200.207:6443  #修改这个文件
#查看修改后的结果
[root@node01 cfg]# vim bootstrap.kubeconfig +5
[root@node01 cfg]# vim kubelet.kubeconfig +5
[root@node01 cfg]# vim kube-proxy.kubeconfig +5
[root@node01 cfg]# grep -n 205 *
bootstrap.kubeconfig:5:    server: https://192.168.200.205:6443
kubelet.kubeconfig:5:    server: https://192.168.200.205:6443
kube-proxy.kubeconfig:5:    server: https://192.168.200.205:6443
#重启动
[root@node01 cfg]# systemctl restart kubelet
[root@node01 cfg]# systemctl restart kube-proxy

在其他Node节点重复上面的操作即可。

2.12.5 在Master节点上进行集群访问测试

[root@Master01 system]# kubectl get node
NAME              STATUS   ROLES    AGE   VERSION
192.168.200.209   Ready    <none>   12d   v1.12.1
192.168.200.210   Ready    <none>   12d   v1.12.1
[root@Master01 system]# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP        23d
nginx        NodePort    10.0.0.192   <none>        80:31442/TCP   11d

2.12.6 给LB-Nginx添加一个访问日志（便于观察学习）

#添加K8S访问日志
[root@LB-Nginx-Master ~]# vim /etc/nginx/nginx.conf 
[root@LB-Nginx-Master ~]# sed -n '13,24p' /etc/nginx/nginx.conf
stream {
    log_format main "$remote_addr $upstream_addr - $time_local $status"； #添加本行
    access_log /var/log/nginx/k8s-access.log main;                        #添加本行
    upstream k8s-apiserver {
     server 192.168.200.207:6443;
     server 192.168.200.208:6443;
    }
    server {
         listen 192.168.200.205:6443;
         proxy_pass k8s-apiserver;
    }
}
特别说明：
remote_addr:请求的来源IP
upstream_addr:负载均衡池的转发目标IP
time_local:本地时间
status：访问状态码

2.12.7 重启Nginx，并观察日志

[root@LB-Nginx-Master ~]# systemctl reload nginx
[root@LB-Nginx-Master ~]# ls /var/log/nginx/
access.log  error.log  k8s-access.log
#重启Node节点的kubelet服务，观察k8s-access.log
[root@node01 cfg]# systemctl restart kubelet
[root@node02 cfg]# systemctl restart kubelet
#查看日志
[root@LB-Nginx-Master ~]# cat /var/log/nginx/k8s-access.log
192.168.200.209 192.168.200.207:6443 - 21/Apr/2019:21:44:02 +0800 200
192.168.200.209 192.168.200.207:6443 - 21/Apr/2019:21:44:02 +0800 200
192.168.200.210 192.168.200.208:6443 - 21/Apr/2019:21:45:04 +0800 200
192.168.200.210 192.168.200.207:6443 - 21/Apr/2019:21:45:04 +0800 200

2.12.8 部署Nginx-Slave及keepalived高可用

Nginx+keepalived的高可用过程部署，由于同学们已经学过了，这里就不再描述
配置完高可用以后，同学们需要注意修改Node节点的指向IP地址，从LB-Nginx-Master上指向VIP地址即可

第三章 kubectl命令行管理工具

3.1 kubectl管理命令概要

QQ截图20190421223622.png-133.4kB

QQ截图20190421223633.png-135.3kB

#kubectl create通过文件创建资源
[root@Master01 system]# kubectl create --help | grep  -A 2 Usage
Usage:
  kubectl create -f FILENAME [options]
#kubectl run在集群中运行一个指定的镜像
[root@Master01 system]# kubectl run --help | grep  -A 2 Usage
Usage:
  kubectl run NAME --image=image [--env="key=value"] [--port=port] [--replicas=replicas] [--dry-run=bool] [--overrides=inline-json] [--command] -- [COMMAND] [args...] [options]
#kubectl expose将容器公开为一个服务
[root@Master01 system]# kubectl expose --help | grep  -A 2 Usage
Usage:
  kubectl expose (-f FILENAME | TYPE NAME) [--port=port] [--protocol=TCP|UDP|SCTP] [--target-port=number-or-name] [--name=name] [--external-ip=external-ip-of-service] [--type=type] [options]
#kubectl set在对象上设置指定的功能
[root@Master01 system]# kubectl set --help | grep  -A 2 Usage
Usage:
  kubectl set SUBCOMMAND [options]
#kubectl get显示一个或多个资源
[root@Master01 system]# kubectl get --help | grep  -A 2 Usage
Usage:
  kubectl get [(-o|--output=)json|yaml|wide|custom-columns=...|custom-columns-file=...|go-template=...|go-template-file=...|jsonpath=...|jsonpath-file=...] (TYPE[.VERSION][.GROUP] [NAME | -l label] | TYPE[.VERSION][.GROUP]/NAME ...) [flags] [options]
#kubectl edit使用默认编辑器编辑一个资源
[root@Master01 system]# kubectl edit --help | grep  -A 2 Usage
Usage:
  kubectl edit (RESOURCE/NAME | -f FILENAME) [options]
#kubectl delete通过文件名，资源名称等删除资源
[root@Master01 system]# kubectl delete --help | grep  -A 2 Usage
Usage:
  kubectl delete ([-f FILENAME] | TYPE [(NAME | -l label | --all)]) [options]

实操演示：认识kubectl

#获取集群中的pods资源信息
[root@Master01 system]# kubectl get pod
NAME                    READY   STATUS    RESTARTS   AGE
nginx-dbddb74b8-ggpxm   1/1     Running   3          12d
#获取集群中所有资源信息
[root@Master01 system]# kubectl get all
NAME                        READY   STATUS    RESTARTS   AGE
pod/nginx-dbddb74b8-ggpxm   1/1     Running   3          12d
NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP        23d
service/nginx        NodePort    10.0.0.192   <none>        80:31442/TCP   12d
NAME                    DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   1         1         1            1           12d
NAME                              DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-dbddb74b8   1         1         1       12d
#更加详细的展示集群中所有资源的信息
[root@Master01 system]# kubectl get all -o wide
NAME                        READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODE
pod/nginx-dbddb74b8-ggpxm   1/1     Running   3          12d   172.17.12.2   192.168.200.209   <none>
NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE   SELECTOR
service/kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP        23d   <none>
service/nginx        NodePort    10.0.0.192   <none>        80:31442/TCP   12d   run=nginx
NAME                    DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES   SELECTOR
deployment.apps/nginx   1         1         1            1           12d   nginx        nginx    run=nginx
NAME                              DESIRED   CURRENT   READY   AGE   CONTAINERS   IMAGES   SELECTOR
replicaset.apps/nginx-dbddb74b8   1         1         1       12d   nginx        nginx    pod-template-hash=dbddb74b8,run=nginx
#更加详细的展示pods中资源的信息
[root@Master01 system]# kubectl get pods -o wide
NAME                    READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-dbddb74b8-ggpxm   1/1     Running   3          12d   172.17.12.2   192.168.200.209   <none>
#查看指定命名空间的pods资源
[root@Master01 system]# kubectl get pods -o wide -n kube-system
NAME                                    READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODE
kubernetes-dashboard-6bff7dc67d-jl7pg   1/1     Running   1          14h   172.17.12.3   192.168.200.209   <none>
特别说明：
命名空间就相当于K8S中的一个虚拟集群

3.2 kubectl工具管理集群应用生命周期

当我们用kubectl下指令去创建pods的时候
它会先创建一个deployment资源部署监控器来执行pods的创建任务
同时，deployment还会监控pods资源的健康状态，如果发现pods副本缺失，会自动创建pods来弥补

3.2.1 Pods创建

创建的作用就是生成一个deployment来执行pods资源的创建任务

: kubectl run nginx --replicas=3 --image=nginx:1.14 --port=80
命令说明：
- kubectl run ：kubectl启动pods的命令
- nginx：deploy的名字
- --replicas：pods副本数
- --image：镜像的名字
- --port：开放容器的内部访问端口

#查看默认命名空间的所有pods资源信息
[root@Master01 ~]# kubectl get pods
No resources found.
#启动一个deploy名字叫做nginx
[root@Master01 ~]# kubectl run nginx --replicas=3 --image=nginx:1.14 --port=80
kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead.
deployment.apps/nginx created
#查看刚刚创建的pods副本
[root@Master01 ~]# kubectl get pods
NAME                      READY   STATUS    RESTARTS   AGE
nginx-65868c9459-2pz44   1/1     Running   0          3s
nginx-65868c9459-9tlzt   1/1     Running   0          3s
nginx-65868c9459-rfdkd   1/1     Running   0          3s
#查看pods资源及deployment资源部署监控器
[root@Master01 ~]# kubectl get pods,deploy
NAME                          READY   STATUS    RESTARTS   AGE
pod/nginx-65868c9459-2pz44   1/1     Running   0          75s
pod/nginx-65868c9459-9tlzt   1/1     Running   0          75s
pod/nginx-65868c9459-rfdkd   1/1     Running   0          75s
NAME                           DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deployment.extensions/nginx   3         3         3            3           75s

3.2.2 Pods发布

发布的作用就是打开pods的对外访问服务（暴露对外的访问端口）

：kubectl expose deployment nginx --port=80 --type=NodePort --target-port=80 --name=nginx-service
命令说明：
- kubectl expose:开启外部访问服务的命令
- deployment nginx：指定deploy的名字
- --port=80：集群内访问端口（供ClusterIP访问的端口）
- --type=NodePort：要开启的服务类型
- --target-port=80：容器内业务的监听端口（也可以当作Pod的监听端口）
- --name=nginx-service：本次发布的服务的名字
:什么叫做集群内端口？什么叫做容器外的内网端口？

QQ截图20190422214133.png-205.2kB

发布的目的是开启node集群内的Pods的ClusterIP访问端口的同时开启集群的外部访问服务端口

#查看集群的service服务（对外访问服务）
[root@Master01 ~]# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP   24d
#将pods公开为一个服务，提供外部访问
[root@Master01 ~]# kubectl expose deployment nginx --port=80 --type=NodePort --target-port=80 --name=nginx-service
service/nginx-service exposed
[root@Master01 ~]# kubectl get svc
NAME            TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes      ClusterIP   10.0.0.1     <none>        443/TCP        24d
nginx-service   NodePort    10.0.0.193   <none>        80:46889/TCP   8s
说明：
80：46889 集群内Node节点之间Pod业务的ClusterIP访问端口映射到集群的外部访问服务端口46889

3.2.3 Pods更新

更新的作用就是升级镜像的版本或者副本数

：kubectl set image deploy/nginx nginx=nginx:1.15
命令说明：
- kubectl set：设置pods的特定功能
- image：指定要设置的功能
- deploy/nginx:指定deploy的名字
- nginx=nginx：1.15 指定镜像的版本号

#查看pods的资源信息
[root@Master01 ~]# kubectl get pods -o wide
NAME                     READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-7b67cfbf9f-6nxmb   1/1     Running   1          48m   172.17.3.2    192.168.200.209   <none>
nginx-7b67cfbf9f-7fmgx   1/1     Running   1          48m   172.17.74.2   192.168.200.210   <none>
nginx-7b67cfbf9f-h6hkv   1/1     Running   1          48m   172.17.3.3    192.168.200.209   <none>
#查看某个pod的镜像具体描述信息里的版本信息
[root@Master01 ~]# kubectl describe pod nginx-7b67cfbf9f-6nxmb | grep nginx:1.14
    Image:          nginx:1.14
  Normal  Pulled          49m   kubelet, 192.168.200.209  Container image "nginx:1.14" already present on machine
  Normal  Pulled          10m   kubelet, 192.168.200.209  Container image "nginx:1.14" already present on machine
#更新pods的镜像的版本
[root@Master01 ~]# kubectl set image deploy/nginx nginx=nginx:1.15
deployment.extensions/nginx image updated
#查看Pods资源情况（ImagePullBackOff为正在pull镜像中）
[root@Master01 ~]# kubectl get pods
NAME                     READY   STATUS             RESTARTS   AGE
nginx-56fbc658b-wgrqj    0/1     ImagePullBackOff   0          50s
nginx-7b67cfbf9f-6nxmb   1/1     Running            1          53m
nginx-7b67cfbf9f-7fmgx   1/1     Running            1          53m
nginx-7b67cfbf9f-h6hkv   1/1     Running            1          53m
[root@Master01 ~]# kubectl get pods
NAME                     READY   STATUS             RESTARTS   AGE
nginx-56fbc658b-wgrqj    0/1     ImagePullBackOff   0          101s
nginx-7b67cfbf9f-6nxmb   1/1     Running            1          54m
nginx-7b67cfbf9f-7fmgx   1/1     Running            1          54m
nginx-7b67cfbf9f-h6hkv   1/1     Running            1          54m
[root@Master01 ~]# kubectl get pods
NAME                     READY   STATUS              RESTARTS   AGE
nginx-56fbc658b-sfzbh    0/1     ContainerCreating   0          23s
nginx-56fbc658b-wgrqj    1/1     Running             0          2m24s
nginx-7b67cfbf9f-6nxmb   1/1     Running             1          54m
nginx-7b67cfbf9f-7fmgx   1/1     Running             1          54m
[root@Master01 ~]# kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
nginx-56fbc658b-br59r   1/1     Running   0          15s
nginx-56fbc658b-sfzbh   1/1     Running   0          43s
nginx-56fbc658b-wgrqj   1/1     Running   0          2m44s
#查看pods的镜像的具体描述信息里的版本信息
[root@Master01 ~]# kubectl describe pod nginx-56fbc658b-br59r | grep nginx:1.15
    Image:          nginx:1.15
  Normal  Pulled     69s   kubelet, 192.168.200.209  Container image "nginx:1.15" already present on machine

QQ截图20190422221728.png-11.3kB

3.2.4 Pods回滚

当我们更新的项目突然有了问题；
我们需要将Pods回滚到上一个版本

：kubectl rollout history deploy/nginx
命令说明：
- kubectl rollout：管理资源的发布的命令
- history deploy/nginx：指定要查看发布历史的deploy的名称
：kubectl rollout undo deploy/nginx
命令说明：
- kubectl rollout：管理资源的发布的命令
- undo deploy/nginx：指定要回滚到上一个版本的deploy的名字

#查看Pods发布过的版本情况
[root@Master01 ~]# kubectl rollout history deploy/nginx
deployment.extensions/nginx 
REVISION  CHANGE-CAUSE
1         <none>
2         <none>
#回滚到上一个版本
[root@Master01 ~]# kubectl rollout undo deploy/nginx
deployment.extensions/nginx
#查看pods回滚情况
[root@Master01 ~]# kubectl get pods -o wide
NAME                     READY   STATUS        RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-56fbc658b-br59r    0/1     Terminating   0          30m   172.17.3.2    192.168.200.209   <none>
nginx-56fbc658b-sfzbh    0/1     Terminating   0          31m   172.17.3.3    192.168.200.209   <none>
nginx-56fbc658b-wgrqj    0/1     Terminating   0          33m   172.17.74.3   192.168.200.210   <none>
nginx-7b67cfbf9f-j4jvr   1/1     Running       0          9s    172.17.74.2   192.168.200.210   <none>
nginx-7b67cfbf9f-nxn8n   1/1     Running       0          8s    172.17.3.2    192.168.200.209   <none>
nginx-7b67cfbf9f-tmlds   1/1     Running       0          6s    172.17.3.3    192.168.200.209   <none>
[root@Master01 ~]# kubectl get pods -o wide
NAME                     READY   STATUS        RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-56fbc658b-br59r    0/1     Terminating   0          30m   172.17.3.2    192.168.200.209   <none>
nginx-56fbc658b-sfzbh    0/1     Terminating   0          31m   172.17.3.3    192.168.200.209   <none>
nginx-56fbc658b-wgrqj    0/1     Terminating   0          33m   172.17.74.3   192.168.200.210   <none>
nginx-7b67cfbf9f-j4jvr   1/1     Running       0          14s   172.17.74.2   192.168.200.210   <none>
nginx-7b67cfbf9f-nxn8n   1/1     Running       0          13s   172.17.3.2    192.168.200.209   <none>
nginx-7b67cfbf9f-tmlds   1/1     Running       0          11s   172.17.3.3    192.168.200.209   <none>
[root@Master01 ~]# kubectl get pods -o wide
NAME                     READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-7b67cfbf9f-j4jvr   1/1     Running   0          24s   172.17.74.2   192.168.200.210   <none>
nginx-7b67cfbf9f-nxn8n   1/1     Running   0          23s   172.17.3.2    192.168.200.209   <none>
nginx-7b67cfbf9f-tmlds   1/1     Running   0          21s   172.17.3.3    192.168.200.209   <none>

QQ截图20190422224308.png-13kB

3.2.5 Pods删除

当我们需要删除Pods时；
我们不能去删除Pods，而是要删除管理Pods的deployment；
如果Pods被发布了对外访问服务，我们还需要删除service

：kubectl rollout undo deploy/nginx
命令说明：
- kubectl rollout：管理资源的发布的命令
- undo deploy/nginx：指定要回滚到上一个版本的deploy的名字

#查看Pods和deploy
[root@Master01 ~]# kubectl get pods,deploy -o wide
NAME                         READY   STATUS    RESTARTS   AGE     IP            NODE              NOMINATED NODE
pod/nginx-7b67cfbf9f-j4jvr   1/1     Running   0          7m21s   172.17.74.2   192.168.200.210   <none>
pod/nginx-7b67cfbf9f-nxn8n   1/1     Running   0          7m20s   172.17.3.2    192.168.200.209   <none>
pod/nginx-7b67cfbf9f-tmlds   1/1     Running   0          7m18s   172.17.3.3    192.168.200.209   <none>
NAME                          DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES       SELECTOR
deployment.extensions/nginx   3         3         3            3           92m   nginx        nginx:1.14   run=nginx
#删除指定的deploy
[root@Master01 ~]# kubectl delete deploy/nginx
deployment.extensions "nginx" deleted
#查看删除的结果
[root@Master01 ~]# kubectl get pods,deploy -o wide
NAME                         READY   STATUS        RESTARTS   AGE     IP       NODE              NOMINATED NODE
pod/nginx-7b67cfbf9f-nxn8n   0/1     Terminating   0          7m40s   <none>   192.168.200.209   <none>
pod/nginx-7b67cfbf9f-tmlds   0/1     Terminating   0          7m38s   <none>   192.168.200.209   <none>
[root@Master01 ~]# kubectl get pods,deploy -o wide
No resources found.
#查看发布的service
[root@Master01 ~]# kubectl get svc
NAME            TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes      ClusterIP   10.0.0.1     <none>        443/TCP        24d
nginx-service   NodePort    10.0.0.193   <none>        80:46889/TCP   79m
#删除指定的service
[root@Master01 ~]# kubectl delete svc/nginx-service
service "nginx-service" deleted
#查看删除结果
[root@Master01 ~]# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP   24d

3.3 kubectl工具远程连接K8S集群

想要管理kubenetes集群，必须在K8S的Master节点上；
要想远程来管理，那么需要进行如下操作

3.3.1 通过脚本和证书生成kubectl的配置文件

#在Master01上，准备一个ssh_kubeconfig.sh脚本
[root@Master01 scripts]# pwd
/server/scripts
[root@Master01 scripts]# ls ssh_kubeconfig.sh 
ssh_kubeconfig.sh
[root@Master01 scripts]# cat ssh_kubeconfig.sh 
#!/bin/bash
kubectl config set-cluster kubernetes \
--server=https://192.168.200.205:6443 \     #负载均衡器VIP或Master01的IP和端口
--embed-certs=true \
--certificate-authority=ca.pem \
--kubeconfig=config
kubectl config set-credentials cluster-admin \
--certificate-authority=ca.pem \
--embed-certs=true \
--client-key=admin-key.pem \
--client-certificate=admin.pem \
--kubeconfig=config
kubectl config set-context default --cluster=kubernetes --user=cluster-admin --kubeconfig=config
kubectl config use-context default --kubeconfig=config
#创建一个目录将需要的证书和脚本拷贝进去
[root@Master01 scripts]# mkdir -p /ssh_config
[root@Master01 scripts]# cp ssh_kubeconfig.sh /ssh_config/
[root@Master01 scripts]# ls k8s-cert/admin.pem k8s-cert/admin-key.pem k8s-cert/ca.pem 
k8s-cert/admin-key.pem  k8s-cert/admin.pem  k8s-cert/ca.pem
[root@Master01 scripts]# cp k8s-cert/admin.pem k8s-cert/admin-key.pem k8s-cert/ca.pem /ssh_config/
[root@Master01 scripts]# cd /ssh_config/
[root@Master01 ssh_config]# ls
admin-key.pem  admin.pem  ca.pem  ssh_kubeconfig.sh
#执行脚本生成config远程连接的配置文件
[root@Master01 ssh_config]# ./ssh_kubeconfig.sh 
Cluster "kubernetes" set.
User "cluster-admin" set.
Context "default" created.
Switched to context "default".
[root@Master01 ssh_config]# ls
admin-key.pem  admin.pem  ca.pem  config  ssh_kubeconfig.sh

3.3.2 kubectl的远程连接测试

#将kubectl二进制命令文件拷贝到Harbor（192.168.200.211）上
[root@Master01 ssh_config]# scp /usr/local/bin/kubectl root@192.168.200.211:/usr/local/bin/
The authenticity of host '192.168.200.211 (192.168.200.211)' cant be established.
ECDSA key fingerprint is SHA256:DbY5ZLFytaIrrM0hUUSYj12DHprd/boGy3Kim6rMrJA.
ECDSA key fingerprint is MD5:59:39:e3:1a:6e:f8:66:4e:0d:de:08:80:cc:89:f4:20.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.200.211' (ECDSA) to the list of known hosts.
root@192.168.200.211s password: 
kubectl                                                                     100%   55MB  81.5MB/s   00:00    
#在Harbor的机器上进行远程连接测试
[root@Harbor ~]# hostname -I
192.168.200.211 
[root@Harbor ~]# which kubectl
/usr/local/bin/kubectl
[root@Harbor ~]# kubectl get node
The connection to the server localhost:8080 was refused - did you specify the right host or port?
#我们发现kubectl并不起作用。
#现在我们将之前生成的config配置文件也拷贝过来
[root@Master01 ssh_config]# scp config root@192.168.200.211:~/
root@192.168.200.211s password: 
config                                                                      100% 6273     7.9MB/s   00:00    
#再次在Harbor服务器上进行kubectl的远程连接测试
[root@Harbor ~]# ls
anaconda-ks.cfg  config
[root@Harbor ~]# kubectl --kubeconfig=./config get node
NAME              STATUS   ROLES    AGE   VERSION
192.168.200.209   Ready    <none>   24d   v1.12.1
192.168.200.210   Ready    <none>   23d   v1.12.1

第四章 YAML文件（资源编排）

YAML是"YAML不是一种标记语言"的外语缩写；
它是一种直观的能够被电脑识别的数据序列化格式，是一个可读性高并且容易被人类阅读，容易和脚本语言交互，用来表达资料序列的编程语言；
它是类似于标准通用标记语言的子集XML的数据描述语言，语法比XML简单很多。

4.1 YAML文件格式说明

缩进表示层级关系
不支持指标符“tab”缩进，使用空格缩进
通常开头缩进2个空格
字符后缩进1个空格，如11冒号，逗号等
"---" 表示YAML格式，一个文件的开始
"#"注释

因为在之前的学习中，Ansible那里已经多次练习过；
所以，这里对于格式不再多说

4.2 YAML文件创建资源对象

QQ截图20190503215421.png-119.7kB

#创建一个目录，制作资源创建的YAML
[root@Master01 ~]# mkdir demo
[root@Master01 ~]# cd demo/
[root@Master01 demo]# pwd
/root/demo
[root@Master01 demo]# vim nginx-deployment.yaml
[root@Master01 demo]# cat nginx-deployment.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.15.4
        ports:
        - containerPort: 80
#根据YAML资源文件创建资源
[root@Master01 demo]# kubectl create --help | grep -A 2 Usage
Usage:
  kubectl create -f FILENAME [options]
[root@Master01 demo]# kubectl create -f nginx-deployment.yaml 
deployment.apps/nginx-deployment created
[root@Master01 demo]# kubectl get pods
NAME                              READY   STATUS              RESTARTS   AGE
nginx-deployment-d55b94fd-2hhw5   0/1     ContainerCreating   0          69s
nginx-deployment-d55b94fd-gtvtp   1/1     Running             0          69s
nginx-deployment-d55b94fd-gvfzg   1/1     Running             0          69s
[root@Master01 demo]# kubectl get pods -o wide
NAME                              READY   STATUS              RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-deployment-d55b94fd-2hhw5   0/1     ContainerCreating   0          85s   <none>        192.168.200.209   <none>
nginx-deployment-d55b94fd-gtvtp   1/1     Running             0          85s   172.17.74.2   192.168.200.210   <none>
nginx-deployment-d55b94fd-gvfzg   1/1     Running             0          85s   172.17.3.3    192.168.200.209   <none>
[root@Master01 demo]# kubectl get pods -o wide
NAME                              READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-deployment-d55b94fd-2hhw5   1/1     Running   0          86s   172.17.3.2    192.168.200.209   <none>
nginx-deployment-d55b94fd-gtvtp   1/1     Running   0          86s   172.17.74.2   192.168.200.210   <none>
nginx-deployment-d55b94fd-gvfzg   1/1     Running   0          86s   172.17.3.3    192.168.200.209   <none>

4.3 YAML文件发布资源对象

[root@Master01 demo]# vim nginx-service.yaml
[root@Master01 demo]# cat nginx-service.yaml 
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
  labels:
    app: nginx
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 80
  selector:
    app: nginx
[root@Master01 demo]# kubectl create -f nginx-service.yaml 
service/nginx-service created
[root@Master01 demo]# kubectl get pods -o wide
NAME                              READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-deployment-d55b94fd-2hhw5   1/1     Running   1          16m   172.17.7.3    192.168.200.209   <none>
nginx-deployment-d55b94fd-gtvtp   1/1     Running   1          16m   172.17.13.2   192.168.200.210   <none>
nginx-deployment-d55b94fd-gvfzg   1/1     Running   1          16m   172.17.7.2    192.168.200.209   <none>
[root@Master01 demo]# kubectl get svc -o wide
NAME            TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE     SELECTOR
kubernetes      ClusterIP   10.0.0.1     <none>        443/TCP        35d     <none>
nginx-service   NodePort    10.0.0.42    <none>        80:35920/TCP   8m13s   app=nginx

QQ截图20190503215201.png-25.2kB

QQ截图20190503215151.png-25.4kB

4.4 YAML字段太多，记不住？

用run命令生成
- kubectl run --image=nginx my-deploy -o yaml --dry-run > my-deploy.yaml
用get命令导出
- kubectl get my-deploy/nginx -o=yaml --export > my-deploy.yaml
Pod容器的字段拼写忘记了
- kubectl explain pods.spec.containers

#用run命令生成
[root@Master01 demo]# kubectl run nginx --image=nginx:1.15.2 --port=80 --replicas=3 -o yaml --dry-run > my-deployment
kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead.
[root@Master01 demo]# cat my-deployment 
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    run: nginx
  name: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      run: nginx
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: nginx
    spec:
      containers:
      - image: nginx:1.15.2
        name: nginx
        ports:
        - containerPort: 80
        resources: {}
status: {}
#用get命令导出
[root@Master01 demo]# kubectl get deploy/nginx-deployment --export
NAME               DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3         0         0            0           <unknown>
[root@Master01 demo]# kubectl get deploy/nginx-deployment --export -o yaml > my-deploy.yaml
[root@Master01 demo]# cat my-deploy.yaml 
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: null
  generation: 1
  labels:
    app: nginx
  name: nginx-deployment
  selfLink: /apis/extensions/v1beta1/namespaces/default/deployments/nginx-deployment
spec:
  progressDeadlineSeconds: 600
  replicas: 3
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: nginx
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nginx
    spec:
      containers:
      - image: nginx:1.15.4
        imagePullPolicy: IfNotPresent
        name: nginx
        ports:
        - containerPort: 80
          protocol: TCP
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
status: {}