RedHat Certified System Engineer(EX300) is an advanced and extended exam from EX200. It tests what EX200 already covers and extend them in a more detailed and advanced level. Network Manager Besides what we already know about using nmcli to configure networks, RHCE would like to see if candidates would understand how nmcli and legacy script based config work. A table of Comparison of nm-settings and ifcfg-* Directives nmcli con mod ifcfg-* file Effect ipv4.

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RedHat Certified System Administrator(EX200) is the 1st to acquire for most of Redhat advanced certificates(non-cloud, regular system admin path), Here are some hints and memo for learning and preparing for RHCSA. Link Files ln has hard link and soft link. ln newfile.txt /tmp/newfile-hlink2.txt will create a hard link of newfile.txt. hard link means full copy of the original file, the ln created hard link file will exist even if the original file got deleted.

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Openshift Setup Hints

All config and cmd in this blog has been verified and tested against Openshift 3.11 release Openshift is Redhat Container Platform, it mainly uses Kubernetes as its PaaS underlay and added more feature such as CICD, app store, etc. How to Install Similar as Kubespray, it uses a toolbox which has root access to all nodes and run ansible scripts to install and deploy everything. Few prerequisites before install:

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Redhat Setup Hints

Redhat has many modification from regular popular linux distributions. Hostname To change hostname on redhat7, simple as issuing following commands, no needs to change hosts file one by one: hostnamectl set-hostname name Network Manager Redhat uses NM to manage all interface settings, including IP, DNS and Routes. It’s also supported to use traditional script under /etc/sysconfig/network-scripts/ifcfg-*. To show current interface: nmcli con show To add a new interface profile with static IP:

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LuLU

Love coding and new technologies

Cloud Solution Consultant

Canada