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OpenShift Origin 3.7 : Deploy Applications
2018/02/07
 
Deploy Applications.
This is the tutorial for common developper users who use Openshift System.
This example is based on the environment like follows. 
-----------+-----------------------------------------------------------+------------
           |10.0.0.30                    |10.0.0.51                    |10.0.0.52
+----------+-----------+      +----------+-----------+      +----------+-----------+
|  [  dlp.srv.world ]  |      | [ node01.srv.world ] |      | [ node02.srv.world ] |
|     (Master Node)    |      |    (Compute Node)    |      |    (Compute Node)    |
|     (Compute Node)   |      |                      |      |                      |
+----------------------+      +----------------------+      +----------------------+
[1] Login with a user who has beed added as an Openshift user on Master Node.
[cent@dlp ~]$
oc login

Authentication required for https://dlp.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@dlp ~]$
oc new-project test-project 

Now using project "test-project" on server "https://dlp.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@dlp ~]$
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@dlp ~]$
oc new-app deployment-example 

--> Found image da61bb2 (2 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@dlp ~]$
oc status 

In project test-project on server https://dlp.srv.world:8443

svc/deployment-example - 172.30.210.173:8080
  dc/deployment-example deploys istag/deployment-example:latest
    deployment #1 deployed 31 seconds ago - 1 pod

View details with 'oc describe <resource>/<name>' or list everything with 'oc get all'.
# describe application

[cent@dlp ~]$
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:                     172.30.210.173
Port:                   8080-tcp        8080/TCP
Endpoints:              10.130.0.6:8080
Session Affinity:       None
Events:                 <none>
# show Pods status

[cent@dlp ~]$
oc get pods 

NAME                         READY     STATUS    RESTARTS   AGE
deployment-example-1-dv2fh   1/1       Running   0          2m
# access to the ClusterIP to verify working

[cent@dlp ~]$
curl 172.30.210.173:8080 

<!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@dlp ~]$
oc delete all -l app=deployment-example

deploymentconfig "deployment-example" deleted
pod "deployment-example-1-dv2fh" deleted
service "deployment-example" deleted
[cent@dlp ~]$
oc get pods

No resources found.
[2] It's also possible to verify status of application on OpenShift admin console.
 
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