OpenShift Origin (OKD) 3.10 : Deploy Applications2018/08/22 |
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Deploy Applications.
This is the tutorial for common developper users who use Openshift System.
This example is based on the cluster environment like follows.
-----------+-----------------------------------------------------------+------------
|10.0.0.25 |10.0.0.51 |10.0.0.52
+----------+-----------+ +----------+-----------+ +----------+-----------+
| [ ctrl.srv.world ] | | [ node01.srv.world ] | | [ node02.srv.world ] |
| (Master Node) | | (Compute Node) | | (Compute Node) |
| (Infra Node) | | | | |
| (Compute Node) | | | | |
+----------------------+ +----------------------+ +----------------------+
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| [1] | Login with a user who has beed added as an Openshift user on Master Node. |
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[cent@ctrl ~]$ oc login Authentication required for https://ctrl.srv.world:8443 (openshift) Username: cent
Password:
Login successful.
You don't have any projects. You can try to create a new project, by running
oc new-project <projectname>
# create [test-project] project [cent@ctrl ~]$ oc new-project test-project
Now using project "test-project" on server "https://ctrl.srv.world:8443".
You can add applications to this project with the 'new-app' command. For example, try:
oc new-app centos/ruby-22-centos7~https://github.com/openshift/ruby-ex.git
to build a new example application in Ruby.
# tag an application image from Docker Hub [cent@ctrl ~]$ oc tag --source=docker openshift/deployment-example:v2 deployment-example:latest Tag deployment-example:latest set to openshift/deployment-example:v2. # deploy [deployment-example] application [cent@ctrl ~]$ oc new-app deployment-example
--> Found image da61bb2 (3 years old) in image stream "test-project/deployment-example" under tag "latest" for "deployment-example"
* This image will be deployed in deployment config "deployment-example"
* Port 8080/tcp will be load balanced by service "deployment-example"
* Other containers can access this service through the hostname "deployment-example"
* WARNING: Image "test-project/deployment-example:latest" runs as the 'root' user which may not be permitted by your cluster administrator
--> Creating resources ...
deploymentconfig "deployment-example" created
service "deployment-example" created
--> Success
Application is not exposed. You can expose services to the outside world by executing one or more of the commands below:
'oc expose svc/deployment-example'
Run 'oc status' to view your app.
# show status [cent@ctrl ~]$ oc status
In project test-project on server https://ctrl.srv.world:8443
svc/deployment-example - 172.30.170.141:8080
dc/deployment-example deploys istag/deployment-example:latest
deployment #1 deployed about a minute ago - 1 pod
2 infos identified, use 'oc status -v' to see details.
# describe application [cent@ctrl ~]$ oc describe svc/deployment-example Name: deployment-example Namespace: test-project Labels: app=deployment-example Annotations: openshift.io/generated-by=OpenShiftNewApp Selector: app=deployment-example,deploymentconfig=deployment-example Type: ClusterIP IP: 172.30.170.141 Port: 8080-tcp 8080/TCP TargetPort: 8080/TCP Endpoints: 10.130.0.6:8080 Session Affinity: None Events: <none> # show Pods status [cent@ctrl ~]$ oc get pods NAME READY STATUS RESTARTS AGE deployment-example-1-8hmfg 1/1 Running 0 1m # access to the ClusterIP to verify working [cent@ctrl ~]$ curl 172.30.170.141:8080 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Deployment Demonstration</title> ..... ..... </head> <body> <div class="box"><h1>v2</h1><h2></h2></div> </body> # if delete application, run like follows [cent@ctrl ~]$ oc delete all -l app=deployment-example deploymentconfig "deployment-example" deleted pod "deployment-example-1-dv2fh" deleted service "deployment-example" deleted [cent@ctrl ~]$ oc get pods No resources found. |
| [2] | It's also possible to verify status of application on OpenShift admin console. |
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