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<typo fs:xx-large; fw: bold;>OpenShift</typo>

====== Resources ======
[[https://docs.docker.com/develop/develop-images/dockerfile_best-practices|Dockerfile Best Practices]] \\

[[https://www.clouda.ca/blog/general/openshift-on-centos-7-quick-installation|OpenShift on CentOS 7]] \\
[[https://github.com/openshift/origin#getting-started|OpenShift ''Getting Started'' on GitHub]] \\
[[https://blog.openshift.com/create-s2i-builder-image|Create builder images with S2I]] \\

[[https://developers.redhat.com/blog/2015/11/19/dns-your-openshift-v3-cluster|DNS for OpenShift v3 cluster]] \\
[[https://docs.openshift.org/3.6/install_config/master_node_configuration.html|OpenShift 3.6 Master Node config]] \\
[[http://sudhaker.com/10/install-the-latest-openshift-v3-on-centos-7-1|Sudhaker's blog]] \\


  * Packages needed:
    * ''yum install go''
    * Install ''S2I'' from: [[https://github.com/openshift/source-to-image/releases]]
  * ?

=== Generate Docker Image ===
<code># Gen image via s2i ... using python container
IMGBASE=s2i-python-container
mkdir s2iloadgen
s2i create ${IMGBASE} s2iloadgen</code>

=== Docker Cheat-Sheet ===
  * List all Bluejay-related images:<code>docker images | grep -i bluejay</code>
  * Start container:<code>docker run -d -P --name loadgen001 bluejay-loadgen</code>
  * Show port mapping:<code>docker port loadgen001 22</code>
  * Stop container:<code>docker container stop loadgen001</code>
  * Remove container:<code>docker container rm loadgen001</code>
  * Remove image:<code>docker image rm bluejay-loadgen</code>

====== Trivia ======

===== Installation: Docker & OC CLI =====
  * In /etc/yum.repos.d/docker.repo<code>[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg</code>
  * ''yum install docker-engine''
  * ''usermod -aG docker msamud1''
  * ''chkconfig docker on''
  * Install S2I:  download and extract to /usr/local/bin ...<code>wget https://github.com/openshift/source-to-image/releases/download/v1.1.10/source-to-image-v1.1.10-27f0729d-linux-amd64.tar.gz</code>
  * OpenShift CLI client (oc):
    * Requires active RHEL subscription to download
    * Once downloaded, extract "oc" from archive into /usr/local/bin

===== PoC/Exploration Notes =====
==== Some URLs researched ... ====
http://www.testautomationguru.com/jmeter-distributed-load-testing-using-docker/ \\
https://hub.docker.com/_/openjdk/ \\
https://eleanordare.com/blog/2018/5/3/using-a-jenkins-pipeline-to-run-jmeter-tests-in-openshift-bkba6 \\
https://eleanordare.com/blog/2017/6/14/using-a-jenkins-pipeline-to-run-jmeter-tests-in-openshift \\
https://blog.openshift.com/remotely-push-pull-container-images-openshift \\
https://docs.openshift.org/latest/dev_guide/jobs.html \\
https://docs.openshift.com/enterprise/3.0/architecture/core_concepts/builds_and_image_streams.html \\
https://blog.openshift.com/running-any-docker-image-on-openshift-origin/ \\
https://docs.openshift.com/online/architecture/core_concepts/builds_and_image_streams.html#pipeline-build \\
https://docs.openshift.com/online/dev_guide/application_lifecycle/new_app.html#dev-guide-new-app \\
https://docs.openshift.com/online/dev_guide/index.html \\
https://docs.openshift.com/online/dev_guide/builds/build_inputs.html#image-source \\
https://docs.openshift.com/online/dev_guide/application_lifecycle/new_app.html \\
https://blog.openshift.com/getting-any-docker-image-running-in-your-own-openshift-cluster/ \\
https://blog.openshift.com/openshift-jobs \\
https://docs.openshift.com/online/rest_api/apis-batch/v1.Job.html \\

==== Initial PoC at Optum's OpenShift ====
  * Ensure that docker-engine is installed on Linux XaaS VM
  * Log in to DTR (Docker Trusted Registry) \\ ''docker login docker.optum.com''
  * Pull existing repository (previously created in web GUI) \\ ''docker pull docker.optum.com/msamud1/bluejay-jmeter''
  * Build new image using S2I (S2I build is another topic)
  * Tag new image in local registry \\ ''docker tag <newimageid> docker.optum.com/msamud1/bluejay-jmeter''
  * Push to DTR \\ ''docker push docker.optum.com/msamud1/bluejay-jmeter''

# NOTE:	these commands assume being run from $HOME/src/bluejay
  * Log in to Optum's OpenShift (this is elk river non-prod) \\ ''oc login https://ocp-elr-core-nonprod.optum.com''
  * Create image stream for base JMeter builder image \\ ''oc create -f ./etc/jmeter.yaml''
  * Create image stream for app-specific load controller \\ ''oc create -f ./etc/timbrado.json''
  * Create image stream for load generator(s) \\ ''oc create -f ./etc/loadgen.json''
  * Create BuildConfig for app-specific load controller \\ ''oc create -f ./etc/bld-timbrado.json''
  * Create BuildConfig for load generator(s) \\ ''oc create -f ./etc/bld-loadgen.json''
  * Run a job: \\ ''oc create -f ./etc/job-launch.yaml''

===== Misc ... =====

==== Container DNS ====

In order for containers to be able to resolve external names, change the ''dnsIP'' value in ''/var/lib/origin/openshift.local.config/node-localhost/node-config.yaml'' to the real LAN's DNS nameserver \\

==== SSH Key Initialization ====
<code>
/usr/bin/ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -N ''
/usr/bin/ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''
/usr/bin/ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
/usr/bin/ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ''
/usr/bin/ssh-keygen -A
</code>

==== Interesting Resources ====
  * [[https://hub.docker.com/r/jdeathe/centos-ssh]]

 \\

//Links ... [[tech:start|Tech]] ... [[tech:linux:start|Linux]] // \\
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