Rhca memoirs -- Introduction to cl280

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DO280 stay CA In the system , It is also a very long course , From me 2018 New year school CA Start , We already have this curriculum system , The current version is 3.5, Now it is 3.9, In fact, there have been 4 Version above , But it has not been popularized in certification .

and 280 Of 3.9 The version will end its cycle after this year , So I want to get certified children's shoes as soon as possible , Hurry up , Study and test before the version change . Next year it will be replaced by 4 Version of .

PS： After changing the version , The official recommended configuration requires at least 64G Memory machine , I suddenly feel that the cost of learning is so high. I want to study hard and pass this exam first .

because OpenShift It's a K8S Encapsulate one more layer for deployment , It can be said to be management K8S For platform , therefore , If there is K8S The foundation of will get started faster . But because of many from CSA、CE The children's shoes that come up for learning have no relevant contact , thus , Learning is difficult , When an error is reported , Many people don't know where to start . But from the examination situation , Due to the use of , As long as you are well prepared , The difficulty is moderate .

therefore , If you want to further study this course , You should first understand K8S, If you have a certain understanding of the principle and collaboration of its various components , Let's learn 280 It'll be twice as much with half the effort . And that is docker Knowledge , This is the foundation of the platform .

If there is no chance to use OpenShift（ How can so many rich enterprises or companies use this platform ？ Most of them use K8S Went to the , You'll see ）, It is enough to know the routine operation . After all, human energy is limited , You should spend your time where you need to learn more .

The following is an excerpt from the official website ：

https://www.redhat.com/zh/services/training-and-certification

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Red hat OpenShift management II（CL210）

Course overview

To configure 、 management OpenShift Cluster and container applications and troubleshoot them

Red hat OpenShift management II ： Operation production level Kubernetes colony (DO280) Teach you how to configure and manage Red hat OpenShift Container platform And troubleshooting . This lab based training course will show you how to verify that the cluster is successfully installed 、 How to carry out daily management , And how to troubleshoot the deployment of container applications .

This course is based on red hat OpenShift Container platform 3.9, Revised as 4.10.

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Course summary

• Describe red hat OpenShift Cluster installation and update process of container platform
• Troubleshoot application deployment issues
• Configure authentication as a local user
• Use role-based access control (RBAC) To control access to the project
• utilize TLS encryption , Open applications to clients outside the cluster
• Use network policy to configure network isolation between services and applications
• Use tags and selectors to configure application scheduling
• Use resource restrictions and quotas to limit the use of computing resources for applications
• Use Web The console manages the cluster and deployed applications
• Use Web Console installation Kubernetes Operator

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Course training object

This course is designed for system administrators 、 System architects and those who want to install and configure red hat OpenShift Container platform developers .

• Interested in learning about OpenShift System and software architects who cluster the features and functions .
• System administrators interested in the continuous management of clustered and containerized applications .
• Cluster operators interested in managing access to cluster resources for users and Applications .
• Site reliability engineers who are interested in participating in daily cluster maintenance and troubleshooting .

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Course prerequisites

• Become Red Hat Certified System Administrator , Or equivalent red hat enterprises Linux System management experience
• complete Red hat OpenShift I (DO180), Or equivalent container 、Kubernetes Use experience and OpenShift Basic knowledge of

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Introduction to classroom environment

All systems have a common user ：student, The password for ：student.

Systematic root The codes are all redhat.

The fourth and fifth virtual machines node1 and node2, The host names are node1.lab.example.com and node2.lab.example.com, They are OpenShift Nodes of the container platform cluster .

• A private docker Warehouse , It contains the images required for the course .

• One is Git The server , Used to store the source code of the application developed during the course .

• With a Node.js Develop module library Nexus The server .

classroom.example.com As the environment network and the external world NAT Router , And provide students with DNS、DHCP、HTTP And other content services . Use two names content.example.com and materials.example.com, Provide course content to be used in practical and experimental exercises .

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Supporting environment routine operation ：

F0 Host password ：root/Asimov
F0 Ordinary user password ;kiosk/redhat

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1. If it is AMD CPU, The following error reports may occur

MoTTY X11 proxy: Unsupported authorisation protocol
Unable to init server: Could not connect: Connection refused
qemu-system-x86_64: error: failed to set MSR 0xe1 to 0x0
qemu-system-x86_64: /build/qemu-BQ4hMP/qemu-4.2/target/i386/kvm.c:2691: kvm_buf_set_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.
Aborted

 This is because AMD CPU Compatibility problem , You need to add kvm Parameters , To open F0 Medium KVM virtual machine .
#  add to KVM Parameters 
tee /etc/modprobe.d/qemu-system-x86.conf << EOF options kvm ignore_msrs=1 EOF

#  restart Vmware Of F0 virtual machine 
reboot

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2. Reset environment order

#  If you have loaded other course environments before , Please execute the following order , Shut down all virtual machines ; If not , Then skip .
rht-vmctl poweroff all
rht-vmctl poweroff classroom

#  Switch course environment command 
rht-setcourse do280

#  After switching the course environment , Initialize the virtual machine required by the course environment （ Reset ）
#  You have to initialize classroom virtual machine , Start up , Start the next 
rht-vmctl fullreset classroom

#  Other virtual machines can be initialized out of order 
#  initialization workstation virtual machine 
rht-vmctl fullreset workstation
#  initialization master virtual machine 
rht-vmctl fullreset master
#  initialization node1 virtual machine 
rht-vmctl fullreset node1
......

#  initialization （ Reset ） Only when the environment is just switched , It can be used later reset Command to reset the virtual machine .

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3. Other operations

#  Start virtual machine 
rht-vmctl start xxx

#  Check the status 
rht-vmctl status xxx

Be careful ：rht-vmctl The command is only valid for the supporting learning environment .

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summary

• Each course has its outline and course content , Can be viewed on the official website .
• Understand the course environment , Every door CA The topology of the environment is similar .
• AMD CPU function KVM Report errors , Kernel settings are required .
• After course switching , There are some operating sequences to follow , Otherwise it will go wrong .

RHCA Certification requires experience 5 Study and examination of the door , It still takes a lot of time to study and prepare for the exam , Come on , Can GA 🤪.

That's all 【 Brother goldfish 】 Yes DO280 The opening Brief introduction and explanation of . I hope it can be helpful to the little friends who see this article .

Red hat Certification Column series ：
RHCSA special column ： entertain RHCSA authentication
RHCE special column ： entertain RHCE authentication
This article is included in RHCA special column ：RHCA memoir

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