centos8_containers [Doku Wiki]

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===== Overview =====

Discussion of [[https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/building_running_and_managing_containers/|"Building, running, and managing containers"]]

Look into:

  * Using the CRI-O Container Engine
  * OCI image format, OCI-compatible container engines
  * OpenShift
  * pods (OpenShift)
  * Create /etc/containers/nodocker to shut up info msg

===== Images =====

  * ubi8/rhel
  * ubi8/rhel-minimal
  * ubi8/rhel-init
  * ubi8/rhel-rsyslog
  * ubi8/support-tools
  * ubi8/net-snmp

===== Packages =====

Installed (or to install):

  * podman (manage containers)
  * buildah (build OCI-compliant container images)
  * skopeo (copy images to and from registries)
  * podman-docker

Dependencies:

  * runc (runtime client for OCI format containers)
  * containers-common
  * containernetworking-plugins
  * oci-systemd-hook
  * oci-umount
  * container-selinux
  * fuse-overlayfs
  * slirp4netns

Modules:

<code>
$ dnf module info container-tools
</code>
===== Concepts =====

OCI: Open Container Initiative

==== Use cases ====

  * single-node
  * multi-node (sometimes called "distributed systems")

==== Core technologies ====

  * cgroups
  * namespaces
  * SELinux

==== Commands ====

  * podman
  * buildah
  * skopeo
  * runc

===== registries.conf =====

<code>
# The only valid categories are: 'registries.search', 'registries.insecure', 
# and 'registries.block'.

[registries.search]
registries = ['registry.redhat.io', 'quay.io', 'docker.io']

# If you need to access insecure registries, add the registry's fully-qualified name.
# An insecure registry is one that does not have a valid SSL certificate or only does HTTP.
[registries.insecure]
registries = []


# If you need to block pull access from a registry, uncomment the section below
# and add the registries fully-qualified name.
#
# Docker only
[registries.block]
registries = []
</code>