kubernetes云平台管理实战： 滚动升级秒级回滚（六）
一、nginx保证有两个版本
1、查看当前容器运行nginx版本
[root@k8s-master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-7w38b 1/1 Running 0 4h 172.16.10.4 k8s-node1
myweb-btflm 1/1 Running 0 4h 172.16.48.4 k8s-node2
myweb-cbt47 1/1 Running 0 4h 172.16.48.3 k8s-node2
myweb-rt3b9 1/1 Running 0 4h 172.16.10.3 k8s-node1
nginx 1/1 Running 0 6h 172.16.10.2 k8s-node1
nginx2 1/1 Running 0 5h 172.16.48.2 k8s-node2
[root@k8s-master ~]# curl -I 172.16.10.2
HTTP/1.1 200 OK
Server: nginx/1.15.8
Date: Sun, 20 Jan 2019 11:31:17 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 25 Dec 2018 09:56:47 GMT
Connection: keep-alive
ETag: "5c21fedf-264"
Accept-Ranges: bytes
2、下载nginx1.13
[root@k8s-master ~]# docker pull nginx:1.13
3、上传到私有仓库
[root@k8s-master ~]# docker tag docker.io/nginx:latest 10.0.128.0:5000/nginx:1.15
[root@k8s-master ~]# docker tag docker.io/nginx:1.13 10.0.128.0:5000/nginx:1.13
[root@k8s-master ~]# docker push 10.0.128.0:5000/nginx:1.13
The push refers to a repository [10.0.128.0:5000/nginx]
7ab428981537: Pushed
82b81d779f83: Pushed
d626a8ad97a1: Pushed
1.13: digest: sha256:e4f0474a75c510f40b37b6b7dc2516241ffa8bde5a442bde3d372c9519c84d90 size: 948
[root@k8s-master ~]# docker push 10.0.128.0:5000/nginx:1.15
The push refers to a repository [10.0.128.0:5000/nginx]
b7efe781401d: Layer already exists
c9c2a3696080: Layer already exists
7b4e562e58dc: Layer already exists
1.15: digest: sha256:e2847e35d4e0e2d459a7696538cbfea42ea2d3b8a1ee8329ba7e68694950afd3 size: 948
[root@k8s-master ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/registry latest 33fbbf4a24e5 2 weeks ago 24.17 MB
10.0.128.0:5000/busybox latest 3a093384ac30 2 weeks ago 1.199 MB
docker.io/busybox latest 3a093384ac30 2 weeks ago 1.199 MB
10.0.128.0:5000/nginx 1.15 7042885a156a 3 weeks ago 109.2 MB
10.0.128.0:5000/nginx latest 7042885a156a 3 weeks ago 109.2 MB
docker.io/nginx latest 7042885a156a 3 weeks ago 109.2 MB
10.0.128.0:5000/nginx 1.13 ae513a47849c 8 months ago 108.9 MB
docker.io/nginx 1.13 ae513a47849c 8 months ago 108.9 MB
10.0.128.0:5000/pod-infrastructure latest 34d3450d733b 24 months ago 205 MB
docker.io/tianyebj/pod-infrastructure latest 34d3450d733b 24 months ago 205 MB
4、私有仓库查看
[root@k8s-master ~]# ls /opt/myregistry/docker/registry/v2/repositories/nginx/_manifests/tags/
1.13 1.15 latest
二、滚动升级
1、删除所有pod和rc
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 5 5 5 5h NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-7w38b 1/1 Running 0 5h
po/myweb-btflm 1/1 Running 0 5h
po/myweb-cbt47 1/1 Running 0 5h
po/myweb-rt3b9 1/1 Running 0 5h
po/nginx 1/1 Running 0 6h
po/nginx2 1/1 Running 0 5h
[root@k8s-master ~]# kubectl delete pod nginx
pod "nginx" deleted
2、创建升级rc
[root@k8s-master ~]# cat myweb-rcv1.yml
apiVersion: v1
kind: ReplicationController
metadata:
name: myweb
spec:
replicas: 3
selector:
app: myweb
template:
metadata:
labels:
app: myweb
spec:
containers:
- name: myweb
image: 10.0.128.0:5000/nginx:1.13
ports:
- containerPort: 80 [root@k8s-master ~]# cat myweb-rcv2.yml
apiVersion: v1
kind: ReplicationController
metadata:
name: myweb2
spec:
replicas: 3
selector:
app: myweb2
template:
metadata:
labels:
app: myweb2
spec:
containers:
- name: myweb2
image: 10.0.128.0:5000/nginx:1.15
ports:
- containerPort: 80
3、执行升级
[root@k8s-master ~]# kubectl rolling-update myweb -f myweb-rcv2.yml --update-period=20s
Created myweb2
Scaling up myweb2 from 0 to 3, scaling down myweb from 3 to 0 (keep 3 pods available, don't exceed 4 pods)
Scaling myweb2 up to 1
Scaling myweb down to 2
Scaling myweb2 up to 2
Scaling myweb down to 1
Scaling myweb2 up to 3
Scaling myweb down to 0
Update succeeded. Deleting myweb
replicationcontroller "myweb" rolling updated to "myweb2"
4、滚动升级过程
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 2 2 2 20m
rc/myweb2 2 2 2 25s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-3hg1r 1/1 Running 0 20m
po/myweb-hzxcp 1/1 Running 0 20m
po/myweb2-rhgq3 1/1 Running 0 5s
po/myweb2-xdtrp 1/1 Running 0 25s
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 2 2 2 20m
rc/myweb2 2 2 2 28s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-3hg1r 1/1 Running 0 20m
po/myweb-hzxcp 1/1 Running 0 20m
po/myweb2-rhgq3 1/1 Running 0 8s
po/myweb2-xdtrp 1/1 Running 0 28s
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 2 2 2 20m
rc/myweb2 2 2 2 30s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-3hg1r 1/1 Running 0 20m
po/myweb-hzxcp 1/1 Running 0 20m
po/myweb2-rhgq3 1/1 Running 0 10s
po/myweb2-xdtrp 1/1 Running 0 30s
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 1 1 1 20m
rc/myweb2 2 2 2 40s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-3hg1r 1/1 Running 0 20m
po/myweb-hzxcp 1/1 Terminating 0 20m
po/myweb2-khl9t 0/1 Pending 0 0s
po/myweb2-rhgq3 1/1 Running 0 20s
po/myweb2-xdtrp 1/1 Running 0 41s
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 1 1 1 20m
rc/myweb2 3 3 3 46s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-3hg1r 1/1 Running 0 20m
po/myweb2-khl9t 1/1 Running 0 6s
po/myweb2-rhgq3 1/1 Running 0 26s
po/myweb2-xdtrp 1/1 Running 0 46s
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 1 1 1 20m
rc/myweb2 3 3 3 50s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-3hg1r 1/1 Running 0 20m
po/myweb2-khl9t 1/1 Running 0 10s
po/myweb2-rhgq3 1/1 Running 0 30s
po/myweb2-xdtrp 1/1 Running 0 50s
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 1 1 1 20m
rc/myweb2 3 3 3 53s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-3hg1r 1/1 Running 0 20m
po/myweb2-khl9t 1/1 Running 0 13s
po/myweb2-rhgq3 1/1 Running 0 33s
po/myweb2-xdtrp 1/1 Running 0 53s
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 1 1 1 20m
rc/myweb2 3 3 3 57s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb-3hg1r 1/1 Running 0 20m
po/myweb2-khl9t 1/1 Running 0 17s
po/myweb2-rhgq3 1/1 Running 0 37s
po/myweb2-xdtrp 1/1 Running 0 57s
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb 0 0 0 21m
rc/myweb2 3 3 3 1m NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb2-khl9t 1/1 Running 0 23s
po/myweb2-rhgq3 1/1 Running 0 43s
po/myweb2-xdtrp 1/1 Running 0 1m
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT READY AGE
rc/myweb2 3 3 3 1m NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 21h NAME READY STATUS RESTARTS AGE
po/myweb2-khl9t 1/1 Running 0 29s
po/myweb2-rhgq3 1/1 Running 0 49s
po/myweb2-xdtrp 1/1 Running 0 1m
三、秒级回滚
1、执行回滚
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb2-khl9t 1/1 Running 0 29m 172.16.10.2 k8s-node1
myweb2-rhgq3 1/1 Running 0 29m 172.16.10.3 k8s-node1
myweb2-xdtrp 1/1 Running 0 29m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl rolling-update myweb2 -f myweb-rcv1.yml --update-period=10s
Created myweb
Scaling up myweb from 0 to 3, scaling down myweb2 from 3 to 0 (keep 3 pods available, don't exceed 4 pods)
Scaling myweb up to 1
Scaling myweb2 down to 2
Scaling myweb up to 2
Scaling myweb2 down to 1
Scaling myweb up to 3
Scaling myweb2 down to 0
Update succeeded. Deleting myweb2
replicationcontroller "myweb2" rolling updated to "myweb"
2、回滚过程
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb2-khl9t 1/1 Running 0 20m 172.16.10.2 k8s-node1
myweb2-rhgq3 1/1 Running 0 20m 172.16.10.3 k8s-node1
myweb2-xdtrp 1/1 Running 0 20m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-mnf7x 1/1 Running 0 4s 172.16.48.2 k8s-node2
myweb2-khl9t 1/1 Running 0 29m 172.16.10.2 k8s-node1
myweb2-rhgq3 1/1 Running 0 29m 172.16.10.3 k8s-node1
myweb2-xdtrp 1/1 Running 0 30m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-mnf7x 1/1 Running 0 6s 172.16.48.2 k8s-node2
myweb2-khl9t 1/1 Running 0 29m 172.16.10.2 k8s-node1
myweb2-rhgq3 1/1 Running 0 29m 172.16.10.3 k8s-node1
myweb2-xdtrp 1/1 Running 0 30m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-mnf7x 1/1 Running 0 7s 172.16.48.2 k8s-node2
myweb2-khl9t 1/1 Running 0 29m 172.16.10.2 k8s-node1
myweb2-rhgq3 1/1 Running 0 29m 172.16.10.3 k8s-node1
myweb2-xdtrp 1/1 Running 0 30m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-7m76h 1/1 Running 0 2s 172.16.10.2 k8s-node1
myweb-mnf7x 1/1 Running 0 12s 172.16.48.2 k8s-node2
myweb2-rhgq3 1/1 Running 0 29m 172.16.10.3 k8s-node1
myweb2-xdtrp 1/1 Running 0 30m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-7m76h 1/1 Running 0 5s 172.16.10.2 k8s-node1
myweb-mnf7x 1/1 Running 0 15s 172.16.48.2 k8s-node2
myweb2-rhgq3 1/1 Running 0 30m 172.16.10.3 k8s-node1
myweb2-xdtrp 1/1 Running 0 30m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-7m76h 1/1 Running 0 11s 172.16.10.2 k8s-node1
myweb-kzq8c 0/1 ContainerCreating 0 1s <none> k8s-node2
myweb-mnf7x 1/1 Running 0 21s 172.16.48.2 k8s-node2
myweb2-xdtrp 1/1 Running 0 30m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-7m76h 1/1 Running 0 14s 172.16.10.2 k8s-node1
myweb-kzq8c 1/1 Running 0 4s 172.16.48.4 k8s-node2
myweb-mnf7x 1/1 Running 0 24s 172.16.48.2 k8s-node2
myweb2-xdtrp 1/1 Running 0 30m 172.16.48.3 k8s-node2
[root@k8s-master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myweb-7m76h 1/1 Running 0 24s 172.16.10.2 k8s-node1
myweb-kzq8c 1/1 Running 0 14s 172.16.48.4 k8s-node2
myweb-mnf7x 1/1 Running 0 34s 172.16.48.2 k8s-node2
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