KubernetesÓ¦ÓÿìËÙÈëÃÅ

Ò»¡¢´´½¨pod

1. kuberctl runÃüÁî

[root@master manifests]# kubectl run --help
Create and run a particular image, possibly replicated. 

Creates a deployment or job to manage the created container(s).
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Usage:
kubectl run NAME --image=image [--env="key=value"]  [--port=port] [--replicas=replicas] [--dry-run=bool]
[--overrides=inline-json] [--command] -- [COMMAND]  [args...] [options]

¼ò¶øÑÔÖ®¾ÍÊÇkuberctl runÃüÁî¾ÍÊÇÓÃÀ´´´½¨deployment»òÕßjob¶ÔÏóµÄ

2. ´´½¨nginx-deploy

[root@master ~]# kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80
deployment.apps/nginx-deploy created
[root@master ~]# kubectl get pods
NAME                          READY     STATUS    RESTARTS   AGE
nginx-deploy-5b595999-49sct   1/1       Running   0          1m

ÕâÑù¾Í´´½¨ÁËÒ»¸önginx-deploy Pod
µ«ÊÇÈçºÎ·ÃÎÊnginx-deployÌṩµÄ·þÎñÄØ£¿
¿ÉÒÔʹÓÃkubectl get pods -o wide²é¿´nginx-deployÈÝÆ÷µÄIP

[root@master ~]# kubectl get pods nginx-deploy-5b595999-49sct -o wide
NAME                          READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deploy-5b595999-49sct   1/1       Running   0          9m        10.244.2.26   node2

È»ºóÔÚ¼¯ÈºÄÚ²¿Ê¹ÓÃcurlÃüÁî·ÃÎÊ£º

[root@master ~]# curl http://10.244.2.26

µ«ÊÇpodÊÇÓÐÉúÃüÖÜÆڵģ¬µ±podå´µôÖ®ºó£¬podµÄIP»áÖØб»·ÖÅ䣬ÄÇô¸ÃÈçºÎ·ÃÎÊpodµÄ¹Ì¶¨¶ËµãÄØ£¿ºÃÔÚkubernetesÌṩÁËservice×÷ΪpodµÄ¹Ì¶¨¶ËµãÓÃÓÚÓû§·ÃÎÊpod

¶þ¡¢´´½¨Service

1. Service·ÃÎʺó¶ËPodʾÒâͼ

2. kubectl exposeÃüÁî

[root@master ~]# kubectl expose --help
Expose a resource as a new Kubernetes service. 

Looks up a deployment, service, replica set, replication controller or pod by name and uses the selector for that
resource as the selector for a new service on the specified port. A deployment or replica set will be exposed as a
service only if its selector is convertible to a selector that service supports, i.e. when the selector contains only
the matchLabels component. Note that if no port is specified via --port and the exposed resource has multiple ports, all
will be re-used by the new service. Also if no labels are specified, the new service will re-use the labels from the
resource it exposes. 

Possible resources include (case insensitive): 

pod (po), service (svc), replicationcontroller (rc), deployment (deploy), replicaset (rs)
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Usage:
kubectl expose (-f FILENAME | TYPE NAME) [-- port=port] [--protocol=TCP|UDP] [--target-port=number-or-name]
[--name=name] [--external-ip=external-ip-of-service] [--type=type] [options]

¼ò¶øÑÔÖ®£¬kubectl exposeÃüÁî¾ÍÊÇÓÃÀ´´´½¨service×ÊÔ´¶ÔÏóµÄ

3. ´´½¨service

[root@master ~]# kubectl expose deployments nginx-deploy --name=nginx-deploy --port=80 --target-port=80 --protocol=TCP
service/nginx-deploy exposed

ÕâÑù½«nginx-deployÒÔserviceµÄÐÎʽ±©Â¶³öÈ¥ÁË

[root@master ~]# kubectl get svc -o wide
NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE       SELECTOR
nginx-deploy   ClusterIP   10.107.30.182   <none>        80/TCP         1m        run=nginx-deploy

4. ͨ¹ýservice·ÃÎÊpod

[root@master ~]# curl http://10.107.30.182

ÉÏÃæµÄIPÊÇserviceµÄIP

Èý¡¢À©ËõÈÝ

1. À©ÈÝ

[root@master ~]# kubectl scale --replicas=2 deployment nginx-deploy
deployment.extensions/nginx-deploy scaled

2. ËõÈÝ

[root@master ~]# kubectl scale --replicas=1 deployment nginx-deploy
deployment.extensions/nginx-deploy scaled

ËÄ¡¢¹ö¶¯Éý¼¶

[root@master ~]# kubectl set image deployment nginx-deploy nginx-deploy=nginx:latest
deployment.extensions/nginx-deploy image updated