[root@linux-node1 ~]# kubectl run net-test --image=alpine --replicas=2 sleep 36000 #创建名称为net-test的应用，镜像指定为alpine，副本数为2个
deployment.apps "net-test" created
[root@linux-node1 ~]# kubectl get pod -o wide #查看pod的状态信息
NAME READY STATUS RESTARTS AGE IP NODE
net-test-7b949fc785-2v2qz 1/1 Running 0 56s 10.2.87.2 192.168.56.120
net-test-7b949fc785-6nrhm 0/1 ContainerCreating 0 56s <none> 192.168.56.130
[root@linux-node1 ~]# ping -c 3 10.2.87.2 #检测pod的连通性
PING 10.2.87.2 (10.2.87.2) 56(84) bytes of data.
64 bytes from 10.2.87.2: icmp_seq=1 ttl=63 time=0.841 ms
64 bytes from 10.2.87.2: icmp_seq=2 ttl=63 time=0.346 ms
64 bytes from 10.2.87.2: icmp_seq=3 ttl=63 time=0.617 ms
--- 10.2.87.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.346/0.601/0.841/0.203 ms
-
二、创建Nginx服务
- 1、创建deployment
[root@linux-node1 ~]# vim nginx-deployment.yaml #使用yaml的方式进行创建应用
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:1.13.12
ports:
- containerPort: 80
[root@linux-node1 ~]# kubectl create -f nginx-deployment.yaml #创建nginx-deployment应用
deployment.apps "nginx-deployment" created
[root@linux-node1 ~]# kubectl get deployment
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
net-test 2 2 2 2 32m
nginx-deployment 3 3 3 0 10s
[root@linux-node1 ~]# kubectl describe deployment nginx-deployment #查看deployment详情
Name: nginx-deployment
Namespace: default
CreationTimestamp: Thu, 16 Aug 2018 16:13:37 +0800
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision=1
Selector: app=nginx
Replicas: 3 desired | 3 updated | 3 total | 0 available | 3 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.13.12
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available False MinimumReplicasUnavailable
Progressing True ReplicaSetUpdated
OldReplicaSets: <none>
NewReplicaSet: nginx-deployment-6c45fc49cb (3/3 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 1m deployment-controller Scaled up replica set nginx-deployment-6c45fc49cb to 3
[root@linux-node1 ~]# kubectl get pod #查看pod在状态，正在创建中，此时应该正在拉取镜像
NAME READY STATUS RESTARTS AGE
net-test-5767cb94df-djt98 1/1 Running 0 22m
net-test-5767cb94df-hcwv7 1/1 Unknown 0 34m
net-test-5767cb94df-zb8m4 1/1 Running 0 34m
nginx-deployment-6c45fc49cb-dmc22 0/1 ContainerCreating 0 2m
nginx-deployment-6c45fc49cb-fd8xm 0/1 ContainerCreating 0 2m
nginx-deployment-6c45fc49cb-sc8sh 0/1 ContainerCreating 0 2m
[root@linux-node1 ~]# kubectl describe pod nginx-deployment-6c45fc49cb-dmc22 #查看具体某个pod的状态信息
[root@linux-node1 ~]# kubectl get pod -o wide #创建成功，状态为Running
NAME READY STATUS RESTARTS AGE IP NODE
net-test-5767cb94df-djt98 1/1 Running 0 24m 10.2.73.3 192.168.56.13
net-test-5767cb94df-hcwv7 1/1 Unknown 0 36m 10.2.10.2 192.168.56.12
net-test-5767cb94df-zb8m4 1/1 Running 0 36m 10.2.73.2 192.168.56.13
nginx-deployment-6c45fc49cb-dmc22 1/1 Running 0 4m 10.2.73.6 192.168.56.13
nginx-deployment-6c45fc49cb-fd8xm 1/1 Running 0 4m 10.2.73.4 192.168.56.13
nginx-deployment-6c45fc49cb-sc8sh 1/1 Running 0 4m 10.2.73.5 192.168.56.13
[root@linux-node1 ~]# curl --head http://10.2.73.6
HTTP/1.1 200 OK
Server: nginx/1.13.12
Date: Thu, 16 Aug 2018 08:18:14 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Mon, 09 Apr 2018 16:01:09 GMT
Connection: keep-alive
ETag: "5acb8e45-264"
Accept-Ranges: bytes
[root@linux-node1 ~]# kubectl set image deployment/nginx-deployment nginx=nginx:1.15.2 --record #nginx的版本升级，由1.13.2升级为1.15.2，记录需要加参数--record
deployment.apps "nginx-deployment" image updated
[root@linux-node1 ~]# kubectl get deployment -o wide #查看更新后的deployment，可以看到当前4个副本，说明还在滚动升级中
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
net-test 2 2 2 2 39m net-test alpine run=net-test
nginx-deployment 3 4 1 3 6m nginx nginx:1.15.2 app=nginx
[root@linux-node1 ~]# kubectl rollout history deployment/nginx-deployment #查看更新历史记录
deployments "nginx-deployment"
REVISION CHANGE-CAUSE
1 <none>
2 kubectl set image deployment/nginx-deployment nginx=nginx:1.15.2 --record=true
[root@linux-node1 ~]# kubectl rollout history deployment/nginx-deployment --revision=1
deployments "nginx-deployment" with revision #1
Pod Template:
Labels: app=nginx
pod-template-hash=2701970576
Containers:
nginx:
Image: nginx:1.13.12
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
[root@linux-node1 ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE
net-test-5767cb94df-djt98 1/1 Running 0 30m 10.2.73.3 192.168.56.13
net-test-5767cb94df-hcwv7 1/1 Unknown 0 42m 10.2.10.2 192.168.56.12
net-test-5767cb94df-zb8m4 1/1 Running 0 42m 10.2.73.2 192.168.56.13
nginx-deployment-64749d4b59-djttr 1/1 Running 0 37s 10.2.73.8 192.168.56.13
nginx-deployment-64749d4b59-jp7fw 1/1 Running 0 3m 10.2.73.7 192.168.56.13
nginx-deployment-64749d4b59-q4fsn 1/1 Running 0 33s 10.2.73.9 192.168.56.13
[root@linux-node1 ~]# curl --head http://10.2.73.7
HTTP/1.1 200 OK
Server: nginx/1.15.2 #版本已经升级为1.15.2
Date: Thu, 16 Aug 2018 08:24:09 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 24 Jul 2018 13:02:29 GMT
Connection: keep-alive
ETag: "5b572365-264"
Accept-Ranges: bytes
[root@linux-node1 ~]# kubectl rollout undo deployment/nginx-deployment #回滚上一个版本
deployment.apps "nginx-deployment"
[root@linux-node1 ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE
net-test-5767cb94df-djt98 1/1 Running 0 32m 10.2.73.3 192.168.56.13
net-test-5767cb94df-hcwv7 1/1 Unknown 0 43m 10.2.10.2 192.168.56.12
net-test-5767cb94df-zb8m4 1/1 Running 0 43m 10.2.73.2 192.168.56.13
nginx-deployment-6c45fc49cb-b9h84 1/1 Running 0 24s 10.2.73.11 192.168.56.13
nginx-deployment-6c45fc49cb-g4mrg 1/1 Running 0 26s 10.2.73.10 192.168.56.13
nginx-deployment-6c45fc49cb-k29kq 1/1 Running 0 21s 10.2.73.12 192.168.56.13
[root@linux-node1 ~]# curl --head http://10.2.73.10
HTTP/1.1 200 OK
Server: nginx/1.13.12
Date: Thu, 16 Aug 2018 08:25:35 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Mon, 09 Apr 2018 16:01:09 GMT
Connection: keep-alive
ETag: "5acb8e45-264"
Accept-Ranges: bytes
回滚完成，每一次更新或者回滚ip都会变化，所以需要通过vip进行访问，这就引入了service
[root@linux-node1 ~]# vim nginx-service.yaml #使用yaml方式创建service
kind: Service
apiVersion: v1
metadata:
name: nginx-service
spec:
selector:
app: nginx
ports:
- protocol: TCP
port: 80
targetPort: 80
[root@linux-node1 ~]# kubectl create -f nginx-service.yaml #创建service
service "nginx-service" created
[root@linux-node1 ~]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.1.0.1 <none> 443/TCP 4h
nginx-service ClusterIP 10.1.213.126 <none> 80/TCP 15s #这个就是vip
[root@linux-node2 ~]# curl --head http://10.1.213.126 #在node2节点上进行访问vip测试，在node1上无法访问是因为没有安装kube-proxy导致无法访问
HTTP/1.1 200 OK
Server: nginx/1.13.12
Date: Thu, 16 Aug 2018 08:30:08 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Mon, 09 Apr 2018 16:01:09 GMT
Connection: keep-alive
ETag: "5acb8e45-264"
Accept-Ranges: bytes
[root@linux-node2 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 10.1.0.1:443 rr persistent 10800
-> 192.168.56.11:6443 Masq 1 0 0
TCP 10.1.213.126:80 rr
-> 10.2.73.10:80 Masq 1 0 1
-> 10.2.73.11:80 Masq 1 0 1
-> 10.2.73.12:80 Masq 1 0 0
查看LVS状态可以看到，当访问VIP：10.1.213.126时，会进行负载均衡到各个pod
[root@linux-node1 ~]# kubectl scale deployment nginx-deployment --replicas 5 #对应用的副本数进行扩容，直接指定副本数为5
deployment.extensions "nginx-deployment" scaled
[root@linux-node1 ~]# kubectl get pod #查看pod状态，可以看到已经增加到5个副本
NAME READY STATUS RESTARTS AGE
net-test-5767cb94df-djt98 1/1 Running 0 38m
net-test-5767cb94df-hcwv7 1/1 Unknown 0 50m
net-test-5767cb94df-zb8m4 1/1 Running 0 50m
nginx-deployment-6c45fc49cb-b9h84 1/1 Running 0 6m
nginx-deployment-6c45fc49cb-g4mrg 1/1 Running 0 7m
nginx-deployment-6c45fc49cb-k29kq 1/1 Running 0 6m
nginx-deployment-6c45fc49cb-n9qkx 1/1 Running 0 24s
nginx-deployment-6c45fc49cb-xpx9s 1/1 Running 0 24s
[root@linux-node2 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 10.1.0.1:443 rr persistent 10800
-> 192.168.56.11:6443 Masq 1 0 0
TCP 10.1.213.126:80 rr
-> 10.2.73.10:80 Masq 1 0 0
-> 10.2.73.11:80 Masq 1 0 0
-> 10.2.73.12:80 Masq 1 0 1
-> 10.2.73.13:80 Masq 1 0 0
-> 10.2.73.14:80 Masq 1 0 0