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# OpenShift

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From ArchWiki

OpenShift is a Kubernetes distribution from Red Hat. It is a complex piece of software that bundles different pieces (monitoring, console-gui, authentication) together. The aim is to support containers in a productive environment with (paid) support by Red Hat.

## Installation

### Server

OKD is an open source alternative which can be used free of charge, see the upstream documentation.

To just try it out, it is possible to use a pre-configured instance at https://learn.openshift.com. Alternatively, install it in a non-production environment (see below).

#### OpenShift v4

Red Hat OpenShift Local can be used to install an OpenShift v4 cluster.

The installation is described in the Getting Started Guide[dead link 2025-01-22—HTTP 404] (please check for correct version). The installation asks for sudo rights (maybe not needed?) and will install an openshift cluster using kvm/libvirt. Since Arch Linux is not natively supported by the setup procedure, make sure you have the prerequisites installed: libvirt, qemu-base, dnsmasq and networkmanager. It will add the current user to the libvirt group. One also needs a secret from cloud.redhat.com (account is needed) that can be obtained in the Red Hat Cloud Console.

The basic steps for installing crc on your computer:

    #untar downloaded archive
    tar -xJf crc-linux-amd64.tar.xz
    #create a bin link so that future versions only need relinking, no new path
    ln -s crc-linux-<VERSION>-amd64 bin
    #add bin folder to PATH and restart your terminal so that PATH is updated (or source config file)
    ...
    #create base install of crc takes some minutes (will ask for secret)
    crc setup
    #start openshift cluster
    crc start
    #get credentials of openshift instance
    crc console --credentials
    #open console in webbrowser
    crc console

### Client

openshift-client-binAUR - Provides the `oc` command.

## Tips and tricks

### Troubleshoot network traffic of a container

In Kubernetes, each shares its network layer with other containers in the same pod. You can install a container with tcpdump in the same pod, and then use `oc rsh` to connect to the container and monitor the traffic.

See Using sidecars to analyze and debug network traffic in OpenShift for more details.

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- Virtualization

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