Infrastructure at your Service

Currently we have many requests to support customers in running PostgreSQL in Docker containers. Some of those use redhat OpenShift as the management platform for their Docker deployments. Setting up an OpenShift cluster requires quite some resources and is nothing you want to do on your workstation usually. To overcome that you can use MiniShift which launches a one node OpenShift cluster which you can use for testing. Setting that up is quite easy.

Obviously MiniShift needs to be downloaded. I’ll be running MiniShift on my workstation and will use VirtualBox as the Hypervisor for Minishift:

dwe@box:~$ sudo mkdir /opt/minishift
[sudo] password for dwe: 
dwe@box:~$ sudo chown dwe:dwe /opt/minishift
dwe@box:~$ cd /opt/minishift
dwe@box:/opt/minishift$ wget https://github.com/minishift/minishift/releases/download/v1.16.1/minishift-1.16.1-linux-amd64.tgz
dwe@box:/opt/minishift$ tar -axf minishift-1.16.1-linux-amd64.tgz
dwe@box:/opt/minishift$ cd minishift-1.16.1-linux-amd64/
dwe@box:/opt/minishift/minishift-1.16.1-linux-amd64$ export PATH=/opt/minishift/minishift-1.16.1-linux-amd64:$PATH
dwe@box:/opt/minishift/minishift-1.16.1-linux-amd64$ minishift config set vm-driver virtualbox
No Minishift instance exists. New 'vm-driver' setting will be applied on next 'minishift start'

Now MiniShift can be started:

dwe@box:/opt/minishift/minishift-1.16.1-linux-amd64$ minishift start

The output should look similar to this:

-- Starting profile 'minishift'
-- Checking if https://github.com is reachable (using proxy: "No") ... OK
-- Checking if requested OpenShift version 'v3.9.0' is valid ... OK
-- Checking if requested OpenShift version 'v3.9.0' is supported ... OK
-- Checking if requested hypervisor 'virtualbox' is supported on this platform ... OK
-- Checking if VirtualBox is installed ... OK
-- Checking the ISO URL ... OK
-- Downloading OpenShift binary 'oc' version 'v3.9.0'
 42.11 MiB / 42.11 MiB [========================================================================================================================] 100.00% 0s-- Downloading OpenShift v3.9.0 checksums ... OK
-- Checking if provided oc flags are supported ... OK
-- Starting local OpenShift cluster using 'virtualbox' hypervisor ...
-- Minishift VM will be configured with ...
   Memory:    2 GB
   vCPUs :    2
   Disk size: 20 GB

   Downloading ISO 'https://github.com/minishift/minishift-b2d-iso/releases/download/v1.2.0/minishift-b2d.iso'
 40.00 MiB / 40.00 MiB [========================================================================================================================] 100.00% 0s
-- Starting Minishift VM ........................... OK
-- Checking for IP address ... OK
-- Checking for nameservers ... OK
-- Checking if external host is reachable from the Minishift VM ... 
   Pinging 8.8.8.8 ... OK
-- Checking HTTP connectivity from the VM ... 
   Retrieving http://minishift.io/index.html ... OK
-- Checking if persistent storage volume is mounted ... OK
-- Checking available disk space ... 0% used OK
   Importing 'openshift/origin:v3.9.0' . CACHE MISS
   Importing 'openshift/origin-docker-registry:v3.9.0'  CACHE MISS
   Importing 'openshift/origin-haproxy-router:v3.9.0'  CACHE MISS
-- OpenShift cluster will be configured with ...
   Version: v3.9.0
Pulling image openshift/origin:v3.9.0
Pulled 1/4 layers, 26% complete
Pulled 2/4 layers, 72% complete
Pulled 3/4 layers, 82% complete
Pulled 4/4 layers, 100% complete
Extracting
Image pull complete
Using Docker shared volumes for OpenShift volumes
Using 192.168.99.100 as the server IP
Starting OpenShift using openshift/origin:v3.9.0 ...
OpenShift server started.

The server is accessible via web console at:

https://192.168.99.100:8443

You are logged in as:
    User:     developer
    Password: 

To login as administrator:
    oc login -u system:admin

-- Exporting of OpenShift images is occuring in background process with pid 7708.

You should also see a new VM in VirtualBox:
Selection_040

As we will need the oc binary to work with OpenShift we need to add that to the PATH:

dwe@box:/opt/minishift/minishift-1.16.1-linux-amd64$ minishift oc-env
export PATH="/home/dwe/.minishift/cache/oc/v3.9.0/linux:$PATH"
# Run this command to configure your shell:
# eval $(minishift oc-env)
dwe@box:/opt/minishift/minishift-1.16.1-linux-amd64$ eval $(minishift oc-env)
dwe@box:/opt/minishift/minishift-1.16.1-linux-amd64$ which oc

And we are ready to use OpenShift:

oc login -u system:admin
Logged into "https://192.168.99.100:8443" as "system:admin" using existing credentials.

You have access to the following projects and can switch between them with 'oc project ':

    default
  * edb
    kube-public
    kube-system
    myproject
    openshift
    openshift-infra
    openshift-node
    openshift-web-console

Using project "edb".

The web interface is up and running is well:
Selection_041

Logging in as system/admin:
Selection_042

… we could already start and deploy a PostgreSQL container but this is the topic for the next post. To stop MiniShift:

dwe@box:~$ minishift stop
Stopping local OpenShift cluster...
Cluster stopped.

Hope that helps.

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Daniel Westermann
Daniel Westermann

Senior Consultant and Technology Leader Open Infrastructure