Linux Certifications 7. Configure cluster scaling Manually control the number of cluster workers To view the machinesets ( group of machines) $ oc get machinesets -n openshift-machine-api To Manually scale machineset option 1 specify the number of replicas $ oc scale --replicas=2 machineset (oooooo) -n openshift-machine-api $ oc get nodes To manually scale the machineset option 2 by editing
Linux Certifications 6. Configure pod scheduling Limit resource usage Resournce Quota definition $ oc create -f filename -n projectname $ oc create quota $ oc get quota Scale applications to meet increased demand Control pod placement across cluster nodes
Linux Certifications 5.Configure networking components Troubleshoot software defined networking Create and edit external routes Control cluster network ingress Create a self signed certificate Secure routes using TLS certificates
Linux Certifications 4.Control access to resources Define role-based access controls Apply permissions to users Create and apply secrets to manage sensitive information Create service accounts and apply permissions using security context constraints
Linux Certifications 3. Manage users & Policies Configure the HTPasswd identity provider for authentication Create or update your htpasswd file $ htpasswd -c -B -b /../..file username password Update credentials $ htpasswd -b /.././file username password $ oc create secret generic htpass-secret --from-file=htpasswd=/../../../file -n openshift-config Create and delete users Modify user passwords Modify user and group permissions Create
RHCS in OpenShift Administration 2. Manage OpenShift Container Platform Use the command-line interface to manage and configure an OpenShift cluster Use the web console to manage and configure an OpenShift cluster Create and delete projects Import, export, and configure Kubernetes resources Examine resources and cluster status View logs Monitor cluster events and alerts Troubleshoot common cluster events and alerts
RHCS in OpenShift Administration 1. About RHCS in in OpenShift Administration Login or use your created account to download the openshift packages to your Linux box. Please note that your virtualbox or vmware workstation should be updated with the following settings: 1. Enable processor virtualization 2. Ensure your virtual machine has at least 40 GB disk and 10 GB RAM assigned
RHCS in Linux Diagnostics and Troubleshooting exam 11. Security Issues Troubleshooting-EX342 Disclaimer: These are my notes following my self-study on troubleshooting . No material comes from either Red Hat course or the Red Hat exam. You will not find any NDA information here. All contents are my own thoughts/understanding on the subject matter.
RHCS in Linux Diagnostics and Troubleshooting exam 10. Kernel Issues Troubleshooting-EX342 Gather information to aid third party investigation of issues * Create kernel crashdumps * Compile and execute SystemTap modules Generally speaking to compile a stap module there are different examples on the web you can download to test. stap -v stapexample.stp * Generate sos reports According to the Linux man page sosreport
RHCS in Linux Diagnostics and Troubleshooting exam 9. Application Issues troubleshooting-EX342 Disclaimer: These are my notes following my self-study on troubleshooting . No material comes from either Red Hat course or the Red Hat exam. You will not find any NDA information here. All contents are my own thoughts/understanding on the subject matter. * Identify library dependencies for third-party software * Identify if
RHCS in Linux Diagnostics and Troubleshooting exam 7. Network Issues Troubleshooting-EX342 Disclaimer: These are my notes following my self-study on troubleshooting . No material comes from either Red Hat course or the Red Hat exam. You will not find any NDA information here. All contents are my own thoughts/understanding on the subject matter.
RHCS in Linux Diagnostics and Troubleshooting exam 5. Storage Issues Troubleshooting-EX342 According to the exam objectives you will need to be able to identify issues with storage and fix them. The following are the objectives of this section : Diagnose and troubleshoot file system issues * Recover corrupted file systems We will be testing this on our virtual server. First : Lets prepare our
RHCS in Linux Diagnostics and Troubleshooting exam 4. Boot Issues Troubleshooting-EX342 Disclaimer: These are my notes following my self-study on troubleshooting . No material comes from either Red Hat course or the Red Hat exam. You will not find any NDA information here. All contents are my own thoughts/understanding on the subject matter.
RHCS in Linux Diagnostics and Troubleshooting exam 3. Introduction to troubleshooting-EX342 Monitor Systems for vital characteristics Configure Systems to send log messages to centralized log host(server) First make sure rsyslog is installed on both servers SERVE 1 >> logs --------------------------—> SERVER2 On server 1 Edit rsyslog.conf
RHCS in Linux Diagnostics and Troubleshooting exam Diagnose & troubleshoot system start up issues-EX342 * Identify and resolve service failures affecting boot to find service dependencies you can view the service systemd file at /etc/systemd/system/ 1. check the configs file systemctl status -l vsftpd 2. check all configurations related to a service 3. List dependencies sysemctl list-dependencies rsyslog * Regain root control of a
Linux Certifications Understanding the Problem: System Information Collection-EX342 In order to troubleshoot the problem you will have to understand it by collecting as much information as possible on the who and where and what. There are different tools available at your disposal to do that on the Linux system such as : 1. SYSTEM JOURNAL Enabling SYSTEM JOURNAL Logs
RHEL7 1. About RHCS in Linux Diagnostics and Troubleshooting-EX342 Disclaimer: These are my notes following my self-study on troubleshooting . No material comes from either Red Hat course or the Red Hat exam. You will not find any NDA information here. All contents are my own thoughts/understanding on the subject matter. Red Hat Website listed the objectives outlines as
Linux Certifications 2. Troubleshooting Exam Lab Setup-EX342 You will need two servers for testing. Use your favorite virtualization software i.e.(VMware or VirtualBox). 1.
RHEL7 Spacewalk Installation & Configuration on CentOS 7 Spacewalk is an open source Linux systems management solution that can be used to create inventories of your systems, develop kick starts and deploy system wide configuration files. In this article we will look on how to install spacewalk on CentOS7.
RHCSA on RHEL 7 Setting up your RHCSA Lab Introduction Setting up a lab to study for your RHCSA or your RHCE is very important step in learning at your own pace and ultimately passing the exam. Most of us uses windows laptops or workstations to browse website and emails etc but we can also use our windows box