Provided by: containerd_1.6.12-0ubuntu1~18.04.1_amd64 
NAME
containerd-config.toml - configuration file for containerd
SYNOPSIS
The config.toml file is a configuration file for the containerd daemon. The file must be placed at
/etc/containerd/config.toml or specified with the --config option of containerd to be used by the daemon.
If the file does not exist at the appropriate location or is not provided via the --config option
containerd uses its default configuration settings, which can be displayed with the containerd config(1)
command.
DESCRIPTION
The TOML file used to configure the containerd daemon settings has a short list of global settings
followed by a series of sections for specific areas of daemon configuration. There is also a section for
plugins that allows each containerd plugin to have an area for plugin-specific configuration and
settings.
FORMAT
version : The version field in the config file specifies the config’s version. If no version number is
specified inside the config file then it is assumed to be a version 1 config and parsed as such. Please
use version = 2 to enable version 2 config as version 1 has been deprecated.
root : The root directory for containerd metadata. (Default: "/var/lib/containerd")
state : The state directory for containerd (Default: "/run/containerd")
plugin_dir : The directory for dynamic plugins to be stored
[grpc] : Section for gRPC socket listener settings. Contains the following properties:
• address (Default: "/run/containerd/containerd.sock")
• tcp_address
• tcp_tls_cert
• tcp_tls_key
• uid (Default: 0)
• gid (Default: 0)
• max_recv_message_size
• max_send_message_size
[ttrpc] : Section for TTRPC settings. Contains properties:
• address (Default: "")
• uid (Default: 0)
• gid (Default: 0)
[debug] : Section to enable and configure a debug socket listener. Contains four properties:
• address (Default: "/run/containerd/debug.sock")
• uid (Default: 0)
• gid (Default: 0)
• level (Default: "info") sets the debug log level
[metrics] : Section to enable and configure a metrics listener. Contains two properties:
• address (Default: "") Metrics endpoint does not listen by default
• grpc_histogram (Default: false) Turn on or off gRPC histogram metrics
disabled_plugins : Disabled plugins are IDs of plugins to disable. Disabled plugins won't be initialized
and started.
required_plugins : Required plugins are IDs of required plugins. Containerd exits if any required plugin
doesn't exist or fails to be initialized or started.
[plugins] : The plugins section contains configuration options exposed from installed plugins. The
following plugins are enabled by default and their settings are shown below. Plugins that are not
enabled by default will provide their own configuration values documentation.
• [plugins.cgroup] has one option no_prometheus (Default: false)
• [plugins.diff] has one option default, a list by default set to ["walking"]
• [plugins.linux] has several options for configuring the runtime, shim, and related options:
• shim specifies the shim binary (Default: "containerd-shim"),
• runtime is the OCI compliant runtime binary (Default: "runc"),
• runtime_root is the root directory used by the runtime (Default: ""),
• no_shim specifies whether to use a shim or not (Default: false),
• shim_debug turns on debugging for the shim (Default: false)
• [plugins."io.containerd.gc.v1.scheduler"] has several options that perform advanced tuning for the
scheduler:
• pause_threshold is the maximum amount of time GC should be scheduled (Default: 0.02),
• deletion_threshold guarantees GC is scheduled after n number of deletions (Default: 0 [not triggered]),
• mutation_threshold guarantees GC is scheduled after n number of database mutations (Default: 100),
• schedule_delay defines the delay after trigger event before scheduling a GC (Default "0ms"
[immediate]),
• startup_delay defines the delay after startup before scheduling a GC (Default "100ms")
• [plugins."io.containerd.runtime-shim.v2.shim"] specifies options for configuring the runtime shim:
• platforms specifies the list of supported platforms
• sched_core Core scheduling is a feature that allows only trusted tasks to run concurrently on cpus
sharing compute resources (eg: hyperthreads on a core). (Default: false)
• [plugins."io.containerd.service.v1.tasks-service"] has one option:
• rdt_config_file (Linux only) specifies path to a configuration used for configuring RDT (Default: "").
Enables support for Intel RDT, a technology for cache and memory bandwidth management. See
⟨https://github.com/intel/goresctrl/blob/v0.2.0/doc/rdt.md#configuration⟩ for details of the
configuration file format.
oom_score : The out of memory (OOM) score applied to the containerd daemon process (Default: 0)
[cgroup] : Section for Linux cgroup specific settings
• path (Default: "") Specify a custom cgroup path for created containers
[proxy_plugins] : Proxy plugins configures plugins which are communicated to over gRPC
• type (Default: "")
• address (Default: "")
timeouts : Timeouts specified as a duration <!-- [timeouts]
"io.containerd.timeout.shim.cleanup" = "5s"
"io.containerd.timeout.shim.load" = "5s"
"io.containerd.timeout.shim.shutdown" = "3s"
"io.containerd.timeout.task.state" = "2s" -->
imports : Imports is a list of additional configuration files to include. This allows to split the main
configuration file and keep some sections separately (for example vendors may keep a custom runtime
configuration in a separate file without modifying the main config.toml). Imported files will overwrite
simple fields like int or string (if not empty) and will append array and map fields. Imported files are
also versioned, and the version can't be higher than the main config.
stream_processors
• accepts (Default: "[]") Accepts specific media-types
• returns (Default: "") Returns the media-type
• path (Default: "") Path or name of the binary
• args (Default: "[]") Args to the binary
EXAMPLE
The following is a complete config.toml default configuration example:
root = "/var/lib/containerd"
state = "/run/containerd"
oom_score = 0
imports = ["/etc/containerd/runtime_*.toml", "./debug.toml"]
[grpc]
address = "/run/containerd/containerd.sock"
uid = 0
gid = 0
[debug]
address = "/run/containerd/debug.sock"
uid = 0
gid = 0
level = "info"
[metrics]
address = ""
grpc_histogram = false
[cgroup]
path = ""
[plugins]
[plugins.cgroups]
no_prometheus = false
[plugins.diff]
default = ["walking"]
[plugins.linux]
shim = "containerd-shim"
runtime = "runc"
runtime_root = ""
no_shim = false
shim_debug = false
[plugins.scheduler]
pause_threshold = 0.02
deletion_threshold = 0
mutation_threshold = 100
schedule_delay = 0
startup_delay = "100ms"
[plugins."io.containerd.runtime-shim.v2.shim"]
platforms = ["linux/amd64"]
sched_core = true
[plugins."io.containerd.service.v1.tasks-service"]
rdt_config_file = "/etc/rdt-config.yaml"
BUGS
Please file any specific issues that you encounter at
⟨https://github.com/containerd/containerd⟩.
AUTHOR
Phil Estes ⟨estesp@gmail.com⟩
SEE ALSO
ctr(8), containerd-config(8), containerd(8)
08/08/2018 /etc/containerd/config.toml(5)