Blogs

OpenStack Network Diagram

August 14, 2017

What does the networking for OpenStack look like? Maybe something like this. # Network VLAN IP CIDR N1 Provisioning (PXE) V:310 172.23.32.0/20 N2 Internal API V:311 172.23.21.0/24 N3 Storage Network (Front) V:312 172.23.22.0/24 N4 Storage Mgmt (Back) V:313 172.23.23.0/24 N5 External Floating IPs V:179 192.0.179.0/24 N6 Public API V:177 192.0.177.0/24 N7 Overcloud Provisioning (Tenant PXE) V:314 172.23.48.0/20 N8 Provider Network (Tenant VM with physical router) V:175 192.0.175.0/24 N9 Tenant Network (tunnels) V:317 172.

How to push an image to an unexposed OpenShift Docker registry

August 9, 2017

How do I push an image to the OpenShift Docker registry if it is not exposed outside the cluster? Login to a member node Get on a machine that has docker and participates in the cluster SDN or can somehow access that network. (eg. 172.30.0.0/16) Get the IP of the registry oc get svc docker-registry -n default --template "{{ .spec.clusterIP }}" SVC_REGISTRY=$(oc get svc docker-registry -n default --template "{{ .spec.clusterIP }}") Get a token for your session

Automated Pruning of OpenShift Artifacts; Builds, Deploys, Images

March 22, 2017

After running openshift for a while I discovered that letting builds pile up to around to around 1,200 led to what was essentially a deadlock in the scheduling of new builds. New builds were stuck in a New, waiting state indefinitely. This was fixed as of OCP 3.4.1, but it caused me to get more pro-active in the pruning of artifacts within OpenShift. I threw together a script and a playbook to deploy it.

Configuring OpenShift with Multiple Sharded Routers

January 29, 2017

I needed to host a service that would be consumed by a closed client that insists on speaking HTTPS on port 50,000. To solve this, I added a 2nd router deployment and used the OpenShift router sharding feature to selectively enable routes on the 2nd router by way of selectors. To summarize: Existing HA router: HTTP 80 HTTPS 443 Haproxy Stats 1,936 Added HA router: HTTP 49,999 HTTPS 50,000 Haproxy Stats 51,936 How To Open infra node firewalls Open firewall on infra nodes where router will run to allow new http and https port iptables -A OS_FIREWALL_ALLOW -m tcp -p tcp --dport 49999 -j ACCEPT iptables -A OS_FIREWALL_ALLOW -m tcp -p tcp --dport 50000 -j ACCEPT This can also be done with Ansible and the os_firewall role in your playbook.

OpenShift Cluster Metrics and Cassandra Troubleshooting

November 14, 2016

OpenShift gathers cluster metrics such as CPU, memory, and network bandwidth per pod which can assist in troubleshooting and capacity planning. The metrics are also used to support horizontal pod autoscaling, which makes the metrics service not just helpful, but critical to operation. Missing Liveness Probes There are 3 major components in the metrics collection process. Heapster gathers stats from Docker and feeds them to Hawkular Metrics to tuck away for safe keeping in Cassandra.

How to List Tags On Redhat Registry Images

July 11, 2016

Ever gone to RedHat’s container registry to search for an image and been left wondering what versions exist? Ever been frustrated by the inconsistent tag format? Is there a v or is there not a v? Me too. Docker Hub has progressed to v2, while the RedHat registry is still v1 at the moment. As long as you use the right syntax, you can use curl to query the registry API and list the tags like this:

Deploy Hawkular Metrics in CDK 2.1 OpenShift 3.2

June 16, 2016

Update! I failed with CDK 2.0, but CDK 2.1 works with some fiddling. In my last post I installed Red Hat Container Developer Kit to deploy OpenShift Enterprise using Vagrant. But now I want to add Hawkular Metrics to that deployment. Deploy Metrics Refer to the docs for deploying metrics in OSE. Login to the vagrant CDK VM before continuing $ cd ~/cdk/components/rhel/rhel-ose/ $ vagrant ssh $ oc login Authentication required for https://127.

Getting Started With RedHat Container Development Kit

June 16, 2016

The RedHat Container Developer Kit allows you to deploy OpenShift on your laptop for easier testing and development. Here is how to deploy it. Register as a RedHat Developer Obtain a RH login Place credentials in ~/.vagrant.d/Vagrantfile to enable updates for VMs by automatically registering with RedHat Subscription Manager Vagrant.configure('2') do |config| config.registration.username = '<your Red Hat username>' config.registration.password = '<your Red Hat password>' end Mac OS X Prereqs Install pre-reqs:

Upgrading OpenShift Enterprise from 3.1 to 3.2

May 17, 2016

Upgrading from OSE 3.1 to 3.2 using the playbook went quite well for me, but there were a few issues to sort out. The issues were related to: ip failover had to be updated manually there was about 5 minutes downtime during the upgrade updates to image streams docker error messages updated policy and role bindings build strategy Source is not allowed hawkular metrics Upgrade Process Following the directions is pretty straight forward.

Changing the SSL Certificate for OpenShift Console

March 24, 2016

OpenShift has an internal CA for generating certificates to authenticate intra-cluster communication, but your browser doesn’t trust this CA. Perhaps you want to fix that without mucking with the internal SSL communication? I did. Here is how. This OpenShift doc explains how to do this, but it isn’t very clear, to me at least. Overview An outline of the steps: Only make changes to the public URLs and not any internal URLs.

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