k8s启动
[root@ken1 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
ken1 Ready master 23h v1.15.2
ken2 Ready <none> 22h v1.15.2
ken3 Ready <none> 22h v1.15.2
那些原因造成的status出现NotReady状态
1.节点docker必须启动
2.防火墙没关
3.flannel网络没有配置
4.iptables桥配置
5.交换分区没关
6.kubelet没启动
k8s集群架构工作演示
第一步：部署nginx的pod
[root@ken1 ~]# kubectl run nginx --image=nginx -r 2
[root@ken ~]# kubectl run httpd-ken1--generator=run-pod/v1 --image=httpd --replicas=2
-r 指定创建的pod数量
第二步：查看创建的pod
[root@ken1 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx-7bb7cd8db5-ffr5m 1/1 Running 0 41s
nginx-7bb7cd8db5-sm4l5 1/1 Running 0 41s
第三步：查看deployment
[root@ken1 ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
nginx 2/2 2 2 2m34s
READY 2/2 第一个2是已经启动的pod数，第二个2是需要总共启动的pod数量
UP-TO-DATE 需要的数量
AVAILABLE 可用的数量
第四步：出刊详细输出信息
[root@ken1 ~]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-7bb7cd8db5-ffr5m 1/1 Running 0 4m41s 10.244.1.4 ken2 <none> <none>
nginx-7bb7cd8db5-sm4l5 1/1 Running 0 4m41s 10.244.4.4 ken3 <none> <none>
分析创建过程：
1.我们使用kubectl通知api-server创建nginx deployment
2. deployment-manager创建nginx deployment
3. schelduler把两个pod调度到不用节点之上
4. 节点之上的kubelet创建两个pod
查看缩写
kubectl api-resources
k8s运行deployment
第一步：查看当前deploy
[root@ken1 ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
nginx 2/2 2 2 11m
第二步：查看当前pod
kubectl
[root@ken1 ~]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-7bb7cd8db5-46rfm 1/1 Running 0 3m41s 10.244.1.5 ken2 <none> <none>
nginx-7bb7cd8db5-sm4l5 1/1 Running 0 12m 10.244.4.4 ken3 <none> <none>
-o wide 显示详细信息
第三步：deploy详细信息
Kubectl describe --help
[root@ken1 ~]# kubectl describe deploy nginx
Name: nginx
Namespace: default
CreationTimestamp: Tue, 20 Aug 2019 09:37:56 +0800
Labels: run=nginx
Annotations: deployment.kubernetes.io/revision: 1
Selector: run=nginx
Replicas: 2 desired | 2 updated | 2 total | 2 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: run=nginx
Containers:
nginx:
Image: nginx
Port: <none>
Host Port: <none>
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Progressing True NewReplicaSetAvailable
Available True MinimumReplicasAvailable
OldReplicaSets: <none>
NewReplicaSet: nginx-7bb7cd8db5 (2/2 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 14m deployment-controller Scaled up replica set nginx-7bb7cd8db5 to 2
查看lebels
kubectl get deploy nginx --show-labels
NAME READY UP-TO-DATE AVAILABLE AGE LABELS
nginx 2/2 2 2 50m run=nginx
第四步：查看replicaset
[root@ken1 ~]# kubectl get rs
NAME DESIRED CURRENT READY AGE
nginx-7bb7cd8db5 2 2 2 18m
第五步：查看rs详细信息
[root@ken1 ~]# kubectl describe rs nginx-7bb7cd8db5
Name: nginx-7bb7cd8db5
Namespace: default
Selector: pod-template-hash=7bb7cd8db5,run=nginx
Labels: pod-template-hash=7bb7cd8db5
run=nginx
Annotations: deployment.kubernetes.io/desired-replicas: 2
deployment.kubernetes.io/max-replicas: 3
deployment.kubernetes.io/revision: 1
Controlled By: Deployment/nginx
Replicas: 2 current / 2 desired
Pods Status: 2 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
Labels: pod-template-hash=7bb7cd8db5
run=nginx
Containers:
nginx:
Image: nginx
Port: <none>
Host Port: <none>
Environment: <none>
Mounts: <none>
Volumes: <none>
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 19m replicaset-controller Created pod: nginx-7bb7cd8db5-ffr5m
Normal SuccessfulCreate 19m replicaset-controller Created pod: nginx-7bb7cd8db5-sm4l5
Normal SuccessfulCreate 10m replicaset-controller Created pod: nginx-7bb7cd8db5-46rfm
第六步：查看pod详细信息
[root@ken1 ~]# kubectl describe po nginx-7bb7cd8db5-46rfm
Name: nginx-7bb7cd8db5-46rfm
Namespace: default
Priority: 0
Node: ken2/192.168.64.6
Start Time: Tue, 20 Aug 2019 09:47:13 +0800
Labels: pod-template-hash=7bb7cd8db5
run=nginx
Annotations: <none>
Status: Running
IP: 10.244.1.5
Controlled By: ReplicaSet/nginx-7bb7cd8db5
Containers:
nginx:
Container ID: docker://e9620bdc9424eba06d4815cd69f8524b6f729af4beff418ab0520e43d2af3da9
Image: nginx
Image ID: docker-pullable://nginx@sha256:53ddb41e46de3d63376579acf46f9a41a8d7de33645db47a486de9769201fec9
Port: <none>
Host Port: <none>
State: Running
Started: Tue, 20 Aug 2019 09:47:24 +0800
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-4vj67 (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-4vj67:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-4vj67
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 11m default-scheduler Successfully assigned default/nginx-7bb7cd8db5-46rfm to ken2
Normal Pulling 11m kubelet, ken2 Pulling image "nginx"
Normal Pulled 11m kubelet, ken2 Successfully pulled image "nginx"
Normal Created 11m kubelet, ken2 Created container nginx
Normal Started 11m kubelet, ken2 Started container nginx
第七步：查看pod日志
[root@ken1 ~]# kubectl logs nginx-7bb7cd8db5-46rfm
持续检测pod日志
[root@ken1 ~]# kubectl logs nginx-7bb7cd8db5-46rfm -f
测试压力
[root@zxw10 ~]# ab -n 55 -c 10 http://10.244.3.4/index.heml
删除pod
第一步：直接删除deploy
[root@ken1 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx-7bb7cd8db5-46rfm 1/1 Running 0 21m
nginx-7bb7cd8db5-sm4l5 1/1 Running 0 30m
[root@ken1 ~]# kubectl delete po nginx-7bb7cd8db5-46rfm
pod "nginx-7bb7cd8db5-46rfm" deleted
[root@ken1 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx-7bb7cd8db5-prgr8 1/1 Running 0 8s
nginx-7bb7cd8db5-sm4l5 1/1 Running 0 30s
注意：
直接删除pod是无法进行删除的，如果说这个pod被deploy进行管理的
[root@ken1 ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
nginx 2/2 2 2 31m
[root@ken1 ~]# kubectl delete deploy nginx
deployment.extensions "nginx" deleted
[root@ken1 ~]# kubectl get deploy
No resources found.
[root@ken1 ~]# kubectl get po
No resources found.
pod命名规则
nginx3-77694b9997-c82dg
deploy replicaset 随机字符串
比如：现在启动一个deploy，配置副本数为3，假如其中一个node宕机，会发生什么？
第一步：启动deploy,副本数为3
[root@ken1 ~]# kubectl run nginx3 --image=nginx -r 3
第二步：查看pod详细信息
[root@ken1 ~]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx1-7885dd9f7-vqk7t 1/1 Running 0 5m1s 10.244.1.8 ken2 <none> <none>
nginx3-77694b9997-25cbs 1/1 Running 0 25s 10.244.4.9 ken3 <none> <none>
nginx3-77694b9997-q5ngb 1/1 Running 0 25s 10.244.1.10 ken2 <none> <none>
nginx3-77694b9997-qw5rq 1/1 Running 0 25s 10.244.4.8 ken3 <none> <none>
第三步：模拟ken3宕机
poweroff
第四步：查看node节点状态
[root@ken1 ~]# kubectl get no
NAME STATUS ROLES AGE VERSION
ken1 Ready master 23h v1.15.2
ken2 Ready <none> 23h v1.15.2
ken3 NotReady <none> 23h v1.15.2
第五步：持续查看pod状态
[root@ken1 ~]# kubectl get po -o wide -w
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx1-7885dd9f7-vqk7t 1/1 Running 0 6m40s 10.244.1.8 ken2 <none> <none>
nginx3-77694b9997-25cbs 1/1 Running 0 2m4s 10.244.4.9 ken3 <none> <none>
nginx3-77694b9997-q5ngb 1/1 Running 0 2m4s 10.244.1.10 ken2 <none> <none>
nginx3-77694b9997-qw5rq 1/1 Running 0 2m4s 10.244.4.8 ken3 <none> <none>
创建资源的两种方式
1，kubectl命令行工具进行创建
2.通过yml文件
认识yml文件
① apiVersion 是当前配置格式的版本。
先执行kubectl api-resources找到所有的资源
在执行命令 kubectl explain deploy即可获取到版本和类型信息
② kind 是要创建的资源类型，这里是 Deployment。
③ metadata 是该资源的元数据，name 是必需的元数据项。
④ spec 部分是该 Deployment 的规格说明。
⑤ replicas 指明副本数量，默认为 1。
⑥ template 定义 Pod 的模板，这是配置文件的重要部分。
⑦ metadata 定义 Pod 的元数据，至少要定义一个 label。label 的 key 和 value 可以任意指定。
⑧ spec 描述 Pod 的规格，此部分定义 Pod 中每一个容器的属性，name 和 image 是必需的。
案列：启动nginxpod，副本数3
1.命令行工具
[root@ken1 ~]# kubectl run nginx3 --image=nginx -r 3
2.编写yml文件
第一步：编写yml文件
[root@ken1 ~]# cat nginx.yml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: nginx
spec:
replicas: 2
template:
metadata:
labels:
kk: ken
spec:
containers:
- name: nginx
image: nginx
第二步：执行yml文件
[root@ken1 ~]# kubectl apply -f nginx.yml
第三步：查看创建的资源
[root@ken1 ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
nginx 2/2 2 2 59s
nginx1 1/1 1 1 51m
nginx3 3/3 3 3 47m
第四步：查看pod
[root@ken1 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx-bdbfcfb4b-5jnqz 1/1 Running 0 78s
nginx-bdbfcfb4b-lmbkp 1/1 Running 0 78s
nginx1-7885dd9f7-vqk7t 1/1 Running 0 52m
nginx3-77694b9997-25cbs 1/1 Terminating 0 47m
nginx3-77694b9997-dsllp 1/1 Running 0 41m
nginx3-77694b9997-q5ngb 1/1 Running 0 47m
nginx3-77694b9997-qw5rq 1/1 Terminating 0 47m
nginx3-77694b9997-vhlnj 1/1 Running 0 41m
第五步：查看标签
[root@ken1 ~]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-bdbfcfb4b-5jnqz 1/1 Running 0 2m29s kk=ken,pod-template-hash=bdbfcfb4b
nginx-bdbfcfb4b-lmbkp 1/1 Running 0 2m29s kk=ken,pod-template-hash=bdbfcfb4b
给node打标签
第一步：给node打标签
[root@ken1 ~]# kubectl label node ken3 disk=ssd
第二步;查看节点标签
[root@ken1 ~]# kubectl get no --show-labels
NAME STATUS ROLES AGE VERSION LABELS
ken1 Ready master 24h v1.15.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=ken1,kubernetes.io/os=linux,node-role.kubernetes.io/master=
ken2 Ready <none> 24h v1.15.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=ken2,kubernetes.io/os=linux
ken3 NotReady <none> 24h v1.15.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disk=ssd,kubernetes.io/arch=amd64,kubernetes.io/hostname=ken3,kubernetes.io/os=linux
第三步：修改yml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: nginx
spec:
replicas: 2
template:
metadata:
labels:
kk: ken
spec:
containers:
- name: nginx
image: nginx
nodeSelector:
disk: ssd
第四步：执行yml文件
[root@ken1 ~]# kubectl apply -f nginx.yml
第五步：查看pod
[root@ken1 ~]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-66bdccc56-2d6m4 1/1 Running 0 7m18s 10.244.4.11 ken3 <none> <none>
nginx-66bdccc56-bxh6z 1/1 Running 0 7m19s 10.244.4.10 ken3 <none> <none>
nginx1-7885dd9f7-vqk7t 1/1 Running 0 66m 10.244.1.8 ken2 <none> <none>
nginx3-77694b9997-dsllp 1/1 Running 0 55m 10.244.1.11 ken2 <none> <none>
nginx3-77694b9997-q5ngb 1/1 Running 0 62m 10.244.1.10 ken2 <none> <none>
nginx3-77694b9997-vhlnj 1/1 Running 0 55m 10.244.1.12 ken2 <none> <none>
第六步：取消标签
[root@ken1 ~]# kubectl label no ken3 disk-
node/ken3 labeled
[root@ken1 ~]# kubectl get no --show-labels
NAME STATUS ROLES AGE VERSION LABELS
ken1 Ready master 24h v1.15.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=ken1,kubernetes.io/os=linux,node-role.kubernetes.io/master=
ken2 Ready <none> 24h v1.15.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=ken2,kubernetes.io/os=linux
ken3 Ready <none> 24h v1.15.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=ken3,kubernetes.io/os=linux,run=nginx
自动伸缩
第一步：修改yml文件
[root@ken1 ~]# cat nginx.yml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: nginx
spec:
replicas: 5
template:
metadata:
labels:
kk: ken
spec:
containers:
- name: nginx
image: nginx
第二步：查看pod
[root@ken1 ~]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-bdbfcfb4b-2gbgr 1/1 Running 0 45s 10.244.4.14 ken3 <none> <none>
nginx-bdbfcfb4b-l9w6p 1/1 Running 0 94s 10.244.4.12 ken3 <none> <none>
nginx-bdbfcfb4b-qfnjt 1/1 Running 0 93s 10.244.1.15 ken2 <none> <none>
nginx-bdbfcfb4b-snmcb 1/1 Running 0 45s 10.244.1.16 ken2 <none> <none>
nginx-bdbfcfb4b-vw62d 1/1 Running 0 46s 10.244.4.13 ken3 <none> <none>
nginx1-7885dd9f7-vqk7t 1/1 Running 0 69m 10.244.1.8 ken2 <none> <none>
nginx3-77694b9997-dsllp 1/1 Running 0 58m 10.244.1.11 ken2 <none> <none>
nginx3-77694b9997-q5ngb 1/1 Running 0 65m 10.244.1.10 ken2 <none> <none>
nginx3-77694b9997-vhlnj 1/1 Running 0 58m 10.244.1.12 ken2 <none> <none>
第三步：减少pod
[root@ken1 ~]# cat nginx.yml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: nginx
spec:
replicas: 1
template:
metadata:
labels:
kk: ken
spec:
containers:
- name: nginx
image: nginx
第四步：查看pod
[root@ken1 ~]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-bdbfcfb4b-qfnjt 1/1 Running 0 2m53s 10.244.1.15 ken2 <none> <none>
nginx1-7885dd9f7-vqk7t 1/1 Running 0 71m 10.244.1.8 ken2 <none> <none>
nginx3-77694b9997-dsllp 1/1 Running 0 60m 10.244.1.11 ken2 <none> <none>
nginx3-77694b9997-q5ngb 1/1 Running 0 66m 10.244.1.10 ken2 <none> <none>
nginx3-77694b9997-vhlnj 1/1 Running 0 60m 10.244.1.12 ken2 <none> <none>
删除yml文件部署的pod
方法一：删除deploy
[root@ken1 ~]# kubectl delete deploy nginx
方法二：删除yml文件
[root@ken1 ~]# kubectl delete -f nginx.yml
执行此命令yml文件依然存在！
