本文同步gitlab 更新 https://github.com/lifalin0802/falin_repos/blob/master/kubernetes_manual.md
创建自主pod
kubectl run d1 --image httpd:alpine --port 80
pod/d1 created
kubectl get deployments #没有东西
kubectl get pods #有了
kubectl get pods -o wide #有了
kubectl describe pod d1 #查看描述
kubectl delete pod d1 #删除pod
创建deployment
kubectl create environment dev #创建名字为dev 的namespace
kubectl create deployment httpd --image httpd:alpine --port 80 -n dev #c创建deployment
kubectl get deployments -n dev
kubectl get deployment -n dev #单复数都可以
这里删除 kubectl delete pod d1只对自主pod work
run命令也只是启动一个自主的pod,
要点解释：
kubectl create deployment XX正常创建deployment ，默认会创建一个pod+两个docker容器, 一个docker是httpd本身，另一个是pause 这个容器。- pause容器干啥的？
相当于infor 容器, 用于共享网络，存储。 - pod可以不属于任何namespace,可以没有namespace的概念。
[root@centos ~]# kubectl run d1 --image httpd:alpine --port 80
pod/d1 created
[root@centos ~]# kubectl get ns
NAME STATUS AGE
default Active 41h
kube-node-lease Active 41h
kube-public Active 41h
kube-system Active 41h
[root@centos ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
d1 1/1 Running 0 70m
nginx-pod-b2796 1/1 Running 0 16h
nginx-pod-g84mg 1/1 Running 0 16h
nginx-pod-mfkv9 1/1 Running 0 16h
[root@centos ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
d1 1/1 Running 0 98m 172.17.0.7 centos <none> <none>
nginx-pod-b2796 1/1 Running 0 16h 172.17.0.6 centos <none> <none>
nginx-pod-g84mg 1/1 Running 0 16h 172.17.0.4 centos <none> <none>
nginx-pod-mfkv9 1/1 Running 0 16h 172.17.0.5 centos <none> <none>
[root@centos ~]# kubectl delete pod d1
pod "d1" deleted
[root@centos ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod-b2796 1/1 Running 0 19h
nginx-pod-g84mg 1/1 Running 0 19h
nginx-pod-mfkv9 1/1 Running 0 19h
[root@centos ~]# kubectl create namespace dev
namespace/dev created
[root@centos ~]# kubectl create deployment httpd --image httpd:alpine --port 80 -n dev
deployment.apps/httpd created
[root@centos ~]# kubectl get deployment
No resources found in default namespace.
[root@centos ~]# kubectl get deployments
No resources found in default namespace.
[root@centos ~]# kubectl get deployments -n dev
NAME READY UP-TO-DATE AVAILABLE AGE
httpd 1/1 1 1 15m
[root@centos ~]# kubectl get deployment -n dev
NAME READY UP-TO-DATE AVAILABLE AGE
httpd 1/1 1 1 15m
查看docker
由deployment创建的:
[root@centos ~]# docker ps|grep httpd
7f0d6dbbee25 5c2ee73209da "httpd-foreground" 15 minutes ago Up 15 minutes k8s_httpd_httpd-76f7455774-2vln2_dev_e0e8e85b-149a-4220-9817-26205137f762_0
f4033c816a79 k8s.gcr.io/pause:3.6 "/pause" 15 minutes ago Up 15 minutes k8s_POD_httpd-76f7455774-2vln2_dev_e0e8e85b-149a-4220-9817-26205137f762_0
[root@centos ~]# kubectl get pod -n dev
NAME READY STATUS RESTARTS AGE
httpd-76f7455774-2vln2 1/1 Running 0 16m
[root@centos ~]#
[root@centos ~]# docker stop 7f
7f
[root@centos ~]# docker ps |grep httpd
1b2ebeb00111 5c2ee73209da "httpd-foreground" 14 seconds ago Up 13 seconds k8s_httpd_httpd-76f7455774-2vln2_dev_e0e8e85b-149a-4220-9817-26205137f762_1
f4033c816a79 k8s.gcr.io/pause:3.6 "/pause" About an hour ago Up About an hour k8s_POD_httpd-76f7455774-2vln2_dev_e0e8e85b-149a-4220-9817-26205137f762_0
[root@centos ~]#
默认pod namespace 是 <none>
查看deployment
若改成replica副本数量是2, 则启动
4个docker
[root@centos ~]# docker ps | grep httpd
93d9558ff466 5c2ee73209da "httpd-foreground" 12 seconds ago Up 11 seconds k8s_httpd_httpd-76f7455774-v45fb_dev_be9d0c08-6330-42b9-acd1-1cccc569beb4_0
9918a9c4ac8b k8s.gcr.io/pause:3.6 "/pause" 13 seconds ago Up 12 seconds k8s_POD_httpd-76f7455774-v45fb_dev_be9d0c08-6330-42b9-acd1-1cccc569beb4_0
1b2ebeb00111 5c2ee73209da "httpd-foreground" 11 minutes ago Up 11 minutes k8s_httpd_httpd-76f7455774-2vln2_dev_e0e8e85b-149a-4220-9817-26205137f762_1
f4033c816a79 k8s.gcr.io/pause:3.6 "/pause" About an hour ago Up About an hour k8s_POD_httpd-76f7455774-2vln2_dev_e0e8e85b-149a-4220-9817-26205137f762_0
1个deployment
[root@centos ~]# kubectl get deployment -n dev
NAME READY UP-TO-DATE AVAILABLE AGE
httpd 2/2 2 2 79m
2个pod:
[root@centos ~]# kubectl get pods -n dev
NAME READY STATUS RESTARTS AGE
httpd-76f7455774-2vln2 1/1 Running 1 (17m ago) 83m
httpd-76f7455774-v45fb 1/1 Running 0 5m56s
[root@centos ~]# kubectl describe pod d1
Name: d1
Namespace: default
Priority: 0
Node: centos/192.168.5.100
Start Time: Mon, 11 Apr 2022 07:08:33 -0400
Labels: run=d1
Annotations: <none>
Status: Running
IP: 172.17.0.7
IPs:
IP: 172.17.0.7
Containers:
d1:
Container ID: docker://b368ac46d5990c4b129260bd1a9f1865e2c23a02157fdc99d227fd8a28ff1635
Image: httpd:alpine
Image ID: docker-pullable://httpd@sha256:4eb4177b9245c686696dd8120c79cd64b7632b27d890db4cad3b0e844ed737af
Port: 80/TCP
Host Port: 0/TCP
State: Running
Started: Mon, 11 Apr 2022 07:09:13 -0400
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-xspzq (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
kube-api-access-xspzq:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
<none>
在这里插入代码片
