第十二章 重做k8s使用harbor作为私有仓库
报错总结：
1.如果要删除的镜像正在被容器使用，那么你是删不了的
2.harbor卸载不干净，/data/harbor/目录下的数据也要删除
3.secret配置只写了一个dp，实际上有几个deployment就需要写几个
1.停止harbor正在运行的容器
2.删除harbor的容器
docker ps -a|grep "goharbor"|awk '{print "docker rm "$1}'
3.删除harbor的镜像
dockerimages|grep "goharbor"|awk '{print "docker rmi "$1":"$2}'
4.解压并修改harbor配置文件
hostname: 10.0.0.11
port: 8888
harbor_admin_password: 123456
data_volume: /data/harbor
5.执行安装并访问
./install.sh
http://10.0.0.11:8888
6.创建一个私有仓库k8s
7.配置docker信任仓库并重启--三台服务器都操作!!!
{
"registry-mirrors": ["https://ig2l319y.mirror.aliyuncs.com"],
"exec-opts": ["native.cgroupdriver=systemd"],
"insecure-registries" : ["http://10.0.0.11:8888"]
}
systemctl restart docker
注意！！！node1重启后harbor会失效，需要重启harbor
cd /opt/harbor
docker-compose stop
docker-compose start
8.docker登陆harbor
docker login 10.0.0.11:8888
9.将docker登陆凭证转化为k8s能识别的base64编码
[root@node1 ~]# cat /root/.docker/config.json|base64
ewoJImF1dGhzIjogewoJCSIxMC4wLjAuMTE6ODg4OCI6IHsKCQkJImF1dGgiOiAiWVdSdGFXNDZN
VEl6TkRVMiIKCQl9Cgl9LAoJIkh0dHBIZWFkZXJzIjogewoJCSJVc2VyLUFnZW50IjogIkRvY2tl
ci1DbGllbnQvMTguMDkuOSAobGludXgpIgoJfQp9
10.编写Secert资源配置清单
[root@node1 ~/demo]# cat harbor-secret.yaml
apiVersion: v1
kind: Secret
metadata:
name: harbor-secret
data:
.dockerconfigjson: ewoJImF1dGhzIjogewoJCSIxMC4wLjAuMTE6ODg4OCI6IHsKCQkJImF1dGgiOiAiWVdSdGFXNDZNVEl6TkRVMiIKCQl9Cgl9LAoJIkh0dHBIZWFkZXJzIjogewoJCSJVc2VyLUFnZW50IjogIkRvY2tlci1DbGllbnQvMTguMDkuOSAobGludXgpIgoJfQp9
type: kubernetes.io/dockerconfigjson
11.应用Secret资源
kubectl delete -f harbor-secret.yaml
kubectl create -f harbor-secret.yaml
kubectl get secrets
12.修改镜像tag并上传到harbor
docker tag kubeguide/tomcat-app:v1 10.0.0.11:8888/k8s/tomcat-app:v1
docker tag mysql:5.7 10.0.0.11:8888/k8s/mysql:5.7
docker push 10.0.0.11:8888/k8s/tomcat-app:v1
docker push 10.0.0.11:8888/k8s/mysql:5.7
13.修改demo资源配置清单
####mysql
imagePullSecrets:
- name: harbor-secret
###tomcat
imagePullSecrets:
- name: harbor-secret
14.应用资源清单并查看
kubectl apply -f .
kubectl get pod
第十三章 POD控制器介绍
0.控制器作用
pod类型的资源，删除pod后，不会重建
替用户监视并保证相应的节点上始终有用户所期望的副本数量的pod在运行
如果所运行的pod副本数超过了用户期望的，那么控制器就会删掉，直到和用户期望的一致
如果所运行的pod副本数低于用户期望的，那么控制器就会创建，直到和用户期望的一致
1.常用控制器类型
ReplicationController RC:
ReplicationSet RS:
按用户期望的副本创建pod,并始终保持相应数量副本
Deployment:
Deployment通过控制RS来保证POD始终保持相应的数量副本
支持滚动更新，回滚,回滚默认保留10个版本
提供声明式配置，支持动态修改
管理无状态应用最理想的控制器
node节点可能会运行0个或多个POD
DeamonSet:
一个节点只运行一个，必须是始终运行的状态
StatefulSet:
有状态应用
Job:
只运行一次的任务，不需要一直运行的任务
确认任务完成才会退出
Cronjob：
周期性的任务
第十四章 ReplicaSet控制器
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1.编写RS控制器资源配置清单
cat >nginx-rs.yaml <<EOF
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: nginx-rs
namespace: default
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
name: nginx-pod
labels:
app: nginx
spec:
containers:
- name: nginx-containers
image: nginx:1.14.0
imagePullPolicy: IfNotPresent
ports:
- name: http
containerPort: 80
EOF
2.应用RS资源配置清单
kubectl create -f nginx-rs.yaml
3.查看RS资源
kubectl get rs
kubectl get pod -o wide
4.动态修改配置 扩容 收缩 升级
kubectl edit rs nginx
kubectl scale rs nginx --replicas=5
5.修改yaml文件应用修改
vim nginx-rs.yaml
kubectl apply -f nginx-rs.yaml
第十五章 Deployment控制器
1.Deployment资源配置清单
cat >nginx-dp.yaml<<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
namespace: default
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
name: nginx-pod
labels:
app: nginx
spec:
containers:
- name: nginx-containers
image: nginx:1.14.0
imagePullPolicy: IfNotPresent
ports:
- name: http
containerPort: 80
EOF
2.应用资源配置清单
kubectl create -f nginx-dp.yaml
3.查看
kubectl get pod -o wide
kubectl get deployments.apps
kubectl describe deployments.apps nginx-deployment
4.更新版本
方法1: 命令行根据资源配置清单修改镜像
kubectl set image -f nginx-dp.yaml nginx-containers=nginx:1.16.0
查看有没有更新
kubectl get pod
kubectl describe deployments.apps nginx-deployment
kubectl describe pod nginx-deployment-7c596b4d95-6ztld
方法2: 命令行根据资源类型修改镜像
打开2个窗口：
第一个窗口监控pod状态
kubectl get pod -w
第二个窗口更新操作
kubectl set image deployment nginx-deployment nginx-containers=nginx:1.14.0
查看更新后的deployment信息
kubectl describe deployments.apps nginx-deployment
----------------------------------------------------
Normal ScalingReplicaSet 14m deployment-controller Scaled up replica set nginx-deployment-7c596b4d95 to 1
Normal ScalingReplicaSet 14m deployment-controller Scaled down replica set nginx-deployment-9c74bb6c7 to 1
Normal ScalingReplicaSet 14m deployment-controller Scaled up replica set nginx-deployment-7c596b4d95 to 2
Normal ScalingReplicaSet 13m deployment-controller Scaled down replica set nginx-deployment-9c74bb6c7 to 0
Normal ScalingReplicaSet 8m30s deployment-controller Scaled up replica set nginx-deployment-9c74bb6c7 to 1
Normal ScalingReplicaSet 8m29s (x2 over 32m) deployment-controller Scaled up replica set nginx-deployment-9c74bb6c7 to 2
Normal ScalingReplicaSet 8m29s deployment-controller Scaled down replica set nginx-deployment-7c596b4d95 to 1
Normal ScalingReplicaSet 8m28s deployment-controller Scaled down replica set nginx-deployment-7c596b4d95 to 0
----------------------------------------------------
更新过程：
nginx-deployment-7c596b4d95-8z7kf #老的版本
nginx-deployment-7c596b4d95-6ztld #老的版本
nginx-deployment-9c74bb6c7-pgfxz 0/1 Pending
nginx-deployment-9c74bb6c7-pgfxz 0/1 Pending
nginx-deployment-9c74bb6c7-pgfxz 0/1 ContainerCreating #拉取新版本镜像
nginx-deployment-9c74bb6c7-pgfxz 1/1 Running #运行新POD
nginx-deployment-7c596b4d95-8z7kf 1/1 Terminating #停止一个旧的POD
nginx-deployment-9c74bb6c7-h7mk2 0/1 Pending
nginx-deployment-9c74bb6c7-h7mk2 0/1 Pending
nginx-deployment-9c74bb6c7-h7mk2 0/1 ContainerCreating #拉取新版本镜像
nginx-deployment-9c74bb6c7-h7mk2 1/1 Running #运行新POD
nginx-deployment-7c596b4d95-6ztld 1/1 Terminating #停止一个旧的POD
nginx-deployment-7c596b4d95-8z7kf 0/1 Terminating #等待旧的POD结束
nginx-deployment-7c596b4d95-6ztld 0/1 Terminating #等待旧的POD结束
查看滚动更新状态：
kubectl rollout status deployment nginx-deployment
5.回滚上一个版本
kubectl describe deployments.apps nginx-deployment
kubectl rollout undo deployment nginx-deployment
kubectl describe deployments.apps nginx-deployment
6.回滚到指定版本
v1 1.14.0
v2 1.15.0
v3 3.333.3
回滚到v1版本
创建第一版 1.14.0
kubectl create -f nginx-dp.yaml --record
更新第二版 1.15.0
kubectl set image deployment nginx-deployment nginx-containers=nginx:1.15.0
更新第三版 1.99.0
kubectl set image deployment nginx-deployment nginx-containers=nginx:1.16.0
查看所有历史版本
kubectl rollout history deployment nginx-deployment
查看指定历史版本信息
kubectl rollout history deployment nginx-deployment --revision=1
回滚到指定版本
kubectl rollout undo deployment nginx-deployment --to-revision=1
7.扩缩容
kubectl scale deployment nginx-deployment --replicas=5
kubectl scale deployment nginx-deployment --replicas=2
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