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CRI-O
RHEL: Available with OpenShift; For more information on installation, visit our install guide.. CRI-O Running Kubernetes Pods What is CRI-O? CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatibleruntimes.
CRI-O
RHEL: Available with OpenShift; For more information on installation, visit our install guide.. CRI-O Running Kubernetes Pods What is CRI-O? CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatibleruntimes.
CRI-O
RHEL: Available with OpenShift; For more information on installation, visit our install guide.. CRI-O Running Kubernetes Pods What is CRI-O? CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatibleruntimes.
CRI-O
RHEL: Available with OpenShift; For more information on installation, visit our install guide.. CRI-O Running Kubernetes Pods What is CRI-O? CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatibleruntimes.
CRI-O
RHEL: Available with OpenShift; For more information on installation, visit our install guide.. CRI-O Running Kubernetes Pods What is CRI-O? CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatibleruntimes.
CRI-O
RHEL: Available with OpenShift; For more information on installation, visit our install guide.. CRI-O Running Kubernetes Pods What is CRI-O? CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatibleruntimes.
CRI-O
LIGHTWEIGHT CONTAINER RUNTIME FOR KUBERNETESVisit blog
* DESIGNED Optimized for Kubernetes * STABLE Committed to passing Kubernetes tests * ANY IMAGE, ANY REGISTRY Pull from _any_ compliant registry; run _any_ OCI-compliant containerTRY NOW
* MINIKUBE: Use CRI-O as the container runtime * KUBEADM: Checkout this kubeadm guideto
setup kubeadm to use CRI-O * KUBIC: Configured to use CRI-O out of the boxin both its
kubeadm and microOS system roles Join #cri-o on IRC (freenode) DISTRIBUTION PACKAGING*
FEDORA: Available on all supported Fedora versions 28, 29 and Rawhide.dnf install cri-o
*
OPENSUSE: Available on Tumbleweed and Kubic (installed by default on Kubic)zypper in cri-o
* UBUNTU: Available as a PPA * CENTOS: Available from the PAAS CRI-O repo * RHEL: Available with OpenShift CRI-O RUNNING KUBERNETES PODSWHAT IS CRI-O?
CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatible runtimes. It is a lightweight alternative to using Docker as the runtime for kubernetes. It allows Kubernetes to use any OCI-compliant runtime as the container runtime for running pods. Today it supports runc and Kata Containers as the container runtimes but any OCI-conformant runtime can be plugged in principle. CRI-O supports OCI container images and can pull from any container registry. It is a lightweight alternative to using Docker, Moby or rkt as the runtime for Kubernetes.CONTRIBUTORS
* Red Hat
* Intel
* SUSE
* Hyper
* IBM
CRI-O is developed by maintainers and contributors from these companies and others. It is a community-driven, open source project. Feedback, users, and of course, contributors, are always welcome via the cri-o/cri-o GitHub project.ARCHITECTURE
The architectural components are as follows: * Kubernetes contacts the kubelet to launch a pod. * Pods are a kubernetes concept consisting of one or more containers sharing the same IPC, NET and PID namespaces and living in the samecgroup.
* The kubelet forwards the request to the CRI-O daemon VIA kubernetes CRI (Container runtime interface) to launch the new POD. * CRI-O uses the containers/image library to pull the image from acontainer registry.
* The downloaded image is unpacked into the container’s root filesystems, stored in COW file systems, using containers/storagelibrary.
* After the rootfs has been created for the container, CRI-O generates an OCI runtime specification json file describing how to run the container using the OCI Generate tools. * CRI-O then launches an OCI Compatible Runtime using the specification to run the container proceses. The default OCI Runtimeis runc.
* Each container is monitored by a separate conmon process. The conmon process holds the pty of the PID1 of the container process. It handles logging for the container and records the exit code for thecontainer process.
* Networking for the pod is setup through use of CNI , so any CNI plugin can beused with CRI-O.
COMPONENTS
CRI-O is made up of several components that are found in different GitHub repositories. * OCI compatible runtime * containers/storage* containers/image
* networking (CNI)
* container monitoring (conmon) * security is provided by several core Linux capabilities OCI COMPATIBLE RUNTIMES CRI-O supports any OCI compatible runtime. We test with runc
and Clear Containers today.STORAGE
The containers/storage library is used for managing layers and creating root file-systems for the containers in a pod: Overlayfs, devicemapper, AUFS and btrfs are implemented, with Overlayfs as the default driver. Support for network based file system images (NFS, GlusterFS, CephFS) is on the development roadmap.CONTAINER IMAGES
The containers/image library is used for pulling images from registries. Currently, it supports Dockerschema 2/version 1
as well as
schema 2/version 2
. It also passes
all Docker and Kubernetes tests.NETWORKING
The Container Network Interface CNI is used for setting up networking for the pods. Various CNI plugins such as Flannel, Weave and OpenShift-SDN have been tested with CRI-O and are working asexpected.
MONITORING
conmon is a
utility within CRI-O that is used to monitor the containers, handle logging from the container process, serve attach clients and detects Out Of Memory (OOM) situations.SECURITY
Container security separation policies are provided by a series of tools including SELinux, Capabilities, seccomp, and other security separation policies as specified in the OCI Specification.CONTRIBUTE
You can find us at:
* GitHub
* IRC: FreeNode, #cri-o channel * Slack: Kubernetes #crio#”cri-o” Tweets
CRI-O is a Cloud Native Computing Foundationincubating project.
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