200 lines
8.8 KiB
Markdown
200 lines
8.8 KiB
Markdown
# CRI Plugin Config Guide
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This document provides the description of the CRI plugin configuration.
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The CRI plugin config is part of the containerd config (default
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path: `/etc/containerd/config.toml`).
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See [here](https://github.com/containerd/containerd/blob/master/docs/ops.md)
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for more information about containerd config.
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The explanation and default value of each configuration item are as follows:
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```toml
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# The "plugins.cri" table contains all of the server options.
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[plugins.cri]
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# stream_server_address is the ip address streaming server is listening on.
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stream_server_address = "127.0.0.1"
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# stream_server_port is the port streaming server is listening on.
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stream_server_port = "0"
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# stream_idle_timeout is the maximum time a streaming connection can be
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# idle before the connection is automatically closed.
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# The string is in the golang duration format, see:
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# https://golang.org/pkg/time/#ParseDuration
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stream_idle_timeout = "4h"
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# enable_selinux indicates to enable the selinux support.
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enable_selinux = false
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# sandbox_image is the image used by sandbox container.
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sandbox_image = "k8s.gcr.io/pause:3.1"
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# stats_collect_period is the period (in seconds) of snapshots stats collection.
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stats_collect_period = 10
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# systemd_cgroup enables systemd cgroup support. This only works for runtime
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# type "io.containerd.runtime.v1.linux".
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# DEPRECATED: use Runtime.Options for runtime specific config for shim v2 runtimes.
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# For runtime "io.containerd.runc.v1", use the option `SystemdCgroup`.
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systemd_cgroup = false
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# enable_tls_streaming enables the TLS streaming support.
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# It generates a self-sign certificate unless the following x509_key_pair_streaming are both set.
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enable_tls_streaming = false
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# "plugins.cri.x509_key_pair_streaming" contains a x509 valid key pair to stream with tls.
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[plugins.cri.x509_key_pair_streaming]
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# tls_cert_file is the filepath to the certificate paired with the "tls_key_file"
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tls_cert_file = ""
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# tls_key_file is the filepath to the private key paired with the "tls_cert_file"
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tls_key_file = ""
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# max_container_log_line_size is the maximum log line size in bytes for a container.
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# Log line longer than the limit will be split into multiple lines. -1 means no
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# limit.
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max_container_log_line_size = 16384
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# disable_cgroup indicates to disable the cgroup support.
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# This is useful when the daemon does not have permission to access cgroup.
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disable_cgroup = false
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# disable_apparmor indicates to disable the apparmor support.
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# This is useful when the daemon does not have permission to access apparmor.
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disable_apparmor = false
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# restrict_oom_score_adj indicates to limit the lower bound of OOMScoreAdj to
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# the containerd's current OOMScoreAdj.
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# This is useful when the containerd does not have permission to decrease OOMScoreAdj.
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restrict_oom_score_adj = false
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# "plugins.cri.containerd" contains config related to containerd
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[plugins.cri.containerd]
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# snapshotter is the snapshotter used by containerd.
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snapshotter = "overlayfs"
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# no_pivot disables pivot-root (linux only), required when running a container in a RamDisk with runc.
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# This only works for runtime type "io.containerd.runtime.v1.linux".
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# DEPRECATED: use Runtime.Options for runtime specific config for shim v2 runtimes.
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# For runtime "io.containerd.runc.v1", use the option `NoPivotRoot`.
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no_pivot = false
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# default_runtime_name is the default runtime name to use.
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default_runtime_name = "runc"
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# "plugins.cri.containerd.default_runtime" is the runtime to use in containerd.
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# DEPRECATED: use `default_runtime_name` and `plugins.cri.runtimes` instead.
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# Remove in containerd 1.4.
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[plugins.cri.containerd.default_runtime]
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# "plugins.cri.containerd.untrusted_workload_runtime" is a runtime to run untrusted workloads on it.
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# DEPRECATED: use `untrusted` runtime in `plugins.cri.runtimes` instead.
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# Remove in containerd 1.4.
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[plugins.cri.containerd.untrusted_workload_runtime]
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# plugins.cri.containerd.runtimes is a map from CRI RuntimeHandler strings, which specify types
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# of runtime configurations, to the matching configurations.
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# In this example, 'runc' is the RuntimeHandler string to match.
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[plugins.cri.containerd.runtimes.runc]
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# runtime_type is the runtime type to use in containerd e.g. io.containerd.runtime.v1.linux
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runtime_type = "io.containerd.runc.v1"
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# pod_annotations is a list of pod annotations passed to both pod
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# sandbox as well as container OCI annotations. Pod_annotations also
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# supports golang path match pattern - https://golang.org/pkg/path/#Match.
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# e.g. ["runc.com.*"], ["*.runc.com"], ["runc.com/*"].
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#
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# For the naming convention of annotation keys, please reference:
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# * Kubernetes: https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/#syntax-and-character-set
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# * OCI: https://github.com/opencontainers/image-spec/blob/master/annotations.md
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pod_annotations = []
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# "plugins.cri.containerd.runtimes.runc.options" is options specific to
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# "io.containerd.runc.v1". Its corresponding options type is:
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# https://github.com/containerd/containerd/blob/v1.2.0-rc.1/runtime/v2/runc/options/oci.pb.go#L39.
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[plugins.cri.containerd.runtimes.runc.options]
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# NoPivotRoot disables pivot root when creating a container.
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NoPivotRoot = false
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# NoNewKeyring disables new keyring for the container.
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NoNewKeyring = false
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# ShimCgroup places the shim in a cgroup.
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ShimCgroup = ""
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# IoUid sets the I/O's pipes uid.
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IoUid = 0
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# IoGid sets the I/O's pipes gid.
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IoGid = 0
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# BinaryName is the binary name of the runc binary.
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BinaryName = ""
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# Root is the runc root directory.
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Root = ""
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# CriuPath is the criu binary path.
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CriuPath = ""
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# SystemdCgroup enables systemd cgroups.
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SystemdCgroup = false
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# "plugins.cri.cni" contains config related to cni
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[plugins.cri.cni]
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# bin_dir is the directory in which the binaries for the plugin is kept.
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bin_dir = "/opt/cni/bin"
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# conf_dir is the directory in which the admin places a CNI conf.
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conf_dir = "/etc/cni/net.d"
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# max_conf_num specifies the maximum number of CNI plugin config files to
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# load from the CNI config directory. By default, only 1 CNI plugin config
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# file will be loaded. If you want to load multiple CNI plugin config files
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# set max_conf_num to the number desired. Setting max_config_num to 0 is
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# interpreted as no limit is desired and will result in all CNI plugin
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# config files being loaded from the CNI config directory.
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max_conf_num = 1
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# conf_template is the file path of golang template used to generate
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# cni config.
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# If this is set, containerd will generate a cni config file from the
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# template. Otherwise, containerd will wait for the system admin or cni
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# daemon to drop the config file into the conf_dir.
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# This is a temporary backward-compatible solution for kubenet users
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# who don't have a cni daemonset in production yet.
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# This will be deprecated when kubenet is deprecated.
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conf_template = ""
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# "plugins.cri.registry" contains config related to the registry
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[plugins.cri.registry]
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# "plugins.cri.registry.mirrors" are namespace to mirror mapping for all namespaces.
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[plugins.cri.registry.mirrors]
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[plugins.cri.registry.mirrors."docker.io"]
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endpoint = ["https://registry-1.docker.io", ]
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```
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## Untrusted Workload
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The recommended way to run untrusted workload is to use
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[`RuntimeClass`](https://kubernetes.io/docs/concepts/containers/runtime-class/) api
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introduced in Kubernetes 1.12 to select RuntimeHandlers configured to run
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untrusted workload in `plugins.cri.containerd.runtimes`.
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However, if you are using the legacy `io.kubernetes.cri.untrusted-workload`pod annotation
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to request a pod be run using a runtime for untrusted workloads, the RuntimeHandler
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`plugins.cri.containerd.runtimes.untrusted` must be defined first. When the annotation
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`io.kubernetes.cri.untrusted-workload` is set to `true` the `untrusted` runtime will be
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used. For example, see
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[Create an untrusted pod using Kata Containers](https://github.com/kata-containers/documentation/blob/master/how-to/how-to-use-k8s-with-cri-containerd-and-kata.md#create-an-untrusted-pod-using-kata-containers).
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## Deprecation
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The config options of the CRI plugin follow the [Kubernetes deprecation
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policy of "admin-facing CLI components"](https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecating-a-flag-or-cli).
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In summary, when a config option is announced to be deprecated:
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* It is kept functional for 6 months or 1 release (whichever is longer);
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* A warning is emitted when it is used.
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