Reference: Devops with Dean - https://www.youtube.com/watch?v=wm9AECTm_48
Openshift Flavors:
Openshift Origin - Opensource version
Openshift Online - Multi tenant cloud based container platform managed by RedHat.
Openshift Dedicated - Single tenant cloud based container platform managed by Redhat.
Openshift Container Platform - This software focus to deploy and manage on their own in an infrastructure of their own choice.
Openshift Community Distribution of Kubernetes - Optimized for Continuous Deployment of Application and multi tenant deployment
Pre-Requisites:
Need to have basic understanding of: 1. Docker 2. Kubernetes
Basically, Kubernetes deploy Docker Containers and forms orchestration tasks.
Openshift on the other hand has tools which operate on underlying kubernetes components such as:
- SCM - code repo integration like gitlab, github
- Build - performed on application source code
- CICD pipeline - OpenShift uses Jenkins CICD pipeline
- Internal Registry - store local built images
Architecture:
First: Recap on uses of Kubernetes:-
There are containers that are deployed with deployment then a service object is created to expose this application to end-users.
Second: What does OpenShift provide:-
1. Web Console to define the underlying kubernetes resources
2. SCM Tools provide built-in support for Git to connect to a repository
3. Pipeline for CICD solutions to test, build, deploy apps
4. Built in image registry to push and pull container images, it provides out-of-the-box solution for users to manage images which they run their workloads.
OpenShift Setup:
- All-In-One (Good for learning)
- OneMaster-MultipleNode
- MultipleMaster-MultipleNode (Preferred for production-grade cluster)
Step 1: Install code ready containers (CRC)
CRC bring a minimal OpenShift cluster to the local computer.
This cluster provide minimal environment for developer and testing.
The main aim is to provide a running cluster to developers.
CRC includes containers with k8s components along with OpenShift tools
Step 2: Download and install CRC binary (can get from RedHat website)
Step 3: Download pull secret (can get from RedHat website too)
Step 4: Extract the binary
tar -xvf <binaryfile>
a folder will be created.
Step 5: Copy the CRC folder (which is the binary) in the folder created above and move it to /usr/loca/bin
cd <foldercreatedinstep4>
sudo mv crc /usr/local/bin
Step 6: Setup CRC
need to cd to directory where pull secret is stored (in this case in downloads folder)
cd ~/Downloads
crc setup
Step 7: Set the pull secret
crc config set pull-secret-file pull-secret.txt
Step 8: Start the CRC
crc start
This will take a bit of time.
This will also provide you with a URL link, 2 accounts (Administrator and User)
Step 9: Open CRC console in local system default browser
crc console
Step 9.2: Open CRC console using the OC line
oc login -u developer <urllink>
Step 10: To stop or delete
crc stop
crc delete
