Provided by: containerd_1.7.12-0ubuntu2~20.04.1_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. Supported levels are: "trace",
"debug", "info", "warn", "error", "fatal", "panic"
• format (Default: "text") sets log format. Supported formats are "text" and "json"
[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."io.containerd.monitor.v1.cgroups"] has one option no_prometheus
(Default: false)
• [plugins."io.containerd.service.v1.diff-service"] has one option default, a list
by default set to ["walking"]
• [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.v2.task"] 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 performance options:
• blockio_config_file (Linux only) specifies path to blockio class definitions
(Default: ""). Controls I/O scheduler priority and bandwidth throttling. See
blockio configuration
⟨https://github.com/intel/goresctrl/blob/main/doc/blockio.md#configuration⟩ for
details of the file format.
• 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 RDT configuration
⟨https://github.com/intel/goresctrl/blob/main/doc/rdt.md#configuration⟩ for
details of the 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:
version = 2
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."io.containerd.monitor.v1.cgroups"]
no_prometheus = false
[plugins."io.containerd.service.v1.diff-service"]
default = ["walking"]
[plugins."io.containerd.gc.v1.scheduler"]
pause_threshold = 0.02
deletion_threshold = 0
mutation_threshold = 100
schedule_delay = 0
startup_delay = "100ms"
[plugins."io.containerd.runtime.v2.task"]
platforms = ["linux/amd64"]
sched_core = true
[plugins."io.containerd.service.v1.tasks-service"]
blockio_config_file = ""
rdt_config_file = ""
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)
04/05/2022 /etc/containerd/config.toml(5)