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% crio.conf(5) Open Container Initiative Daemon
% Aleksa Sarai
% OCTOBER 2016
# NAME
crio.conf - CRI-O configuration file
# DESCRIPTION
The CRI-O configuration file specifies all of the available command-line options
for the crio(8) program, but in a TOML format that can be more easily modified
and versioned.
# FORMAT
The [TOML format][toml] is used as the encoding of the configuration file.
Every option and subtable listed here is nested under a global "crio" table.
No bare options are used. The format of TOML can be simplified to:
[table]
option = value
[table.subtable1]
option = value
[table.subtable2]
option = value
## CRIO TABLE
The `crio` table supports the following options:
**root**=""
CRIO root dir (default: "/var/lib/containers/storage")
**runroot**=""
CRIO state dir (default: "/var/run/containers/storage")
**storage_driver**=""
CRIO storage driver (default is "overlay")
Note:
**overlay** and **overlay2** are the same driver
**storage_option**=[]
CRIO storage driver option list (no default)
Values:
"STORAGE_DRIVER.imagestore=/PATH",
Paths to additional container image stores. These are read/only and are usually stored on remote network shares, based on overlay storage format.
storage_option=[ "overlay.imagestore=/mnt/overlay", ]
"STORAGE_DRIVER.size=SIZE"
Maximum size of a container image. Default is 10GB. The size flag sets quota on the size of container images.
storage_option=[ "overlay.size=1G", ]
Note: Not all drivers support all options.
Note: In order to use the **size** option for quota on *overlay* storage you must use the *xfs* file system. The mount point that the *overlay* file system must be setup with the *pquota* flag at mount time. If you are setting up / to be used with quota, you have to modify the linux boot line in /etc/grubq2.conf and add the rootflags=pquota flag.
Example:
linux16 /vmlinuz-4.12.13-300.fc26.x86_64 root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet LANG=en_US.UTF-8 rootflags=pquota
## CRIO.API TABLE
**listen**=""
Path to crio socket (default: "/var/run/crio.sock")
## CRIO.RUNTIME TABLE
**conmon**=""
Path to the conmon executable (default: "/usr/local/libexec/crio/conmon")
**conmon_env**=[]
Environment variable list for conmon process (default: ["PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",])
**log_size_max**=""
Maximum sized allowed for the container log file (default: -1)
Negative numbers indicate that no size limit is imposed.
If it is positive, it must be >= 8192 (to match/exceed conmon read buffer).
The file is truncated and re-opened so the limit is never exceeded.
**pids_limit**=""
Maximum number of processes allowed in a container (default: 1024)
**runtime**=""
OCI runtime path (default: "/usr/bin/runc")
**selinux**=*true*|*false*
Enable selinux support (default: false)
**signature_policy**=""
Path to the signature policy json file (default: "", to use the system-wide default)
**seccomp_profile**=""
Path to the seccomp json profile to be used as the runtime's default (default: "/etc/crio/seccomp.json")
**apparmor_profile**=""
Name of the apparmor profile to be used as the runtime's default (default: "crio-default")
**no_pivot**=*true*|*false*
Instructs the runtime to not use pivot_root, but instead use MS_MOVE
**default_mounts**=[]
List of mount points, in the form host:container, to be mounted in every container
## CRIO.IMAGE TABLE
**default_transport**
A prefix to prepend to image names that can't be pulled as-is (default: "docker://")
**image_volumes**=""
Image volume handling ('mkdir', 'bind' or 'ignore') (default: "mkdir")
mkdir: A directory is created inside the container root filesystem for the volumes.
bind: A directory is created inside container state directory and bind mounted into
the container for the volumes.
ignore: All volumes are just ignored and no action is taken.
**insecure_registries**=""
Enable insecure registry communication, i.e., enable un-encrypted
and/or untrusted communication.
List of insecure registries can contain an element with CIDR notation
to specify a whole subnet. Insecure registries accept HTTP and/or
accept HTTPS with certificates from unknown CAs.
Enabling --insecure-registry is useful when running a local registry.
However, because its use creates security vulnerabilities it should
ONLY be enabled for testing purposes. For increased security, users
should add their CA to their system's list of trusted CAs instead of
using --insecure-registry.
**pause_command**=""
Path to the pause executable in the pause image (default: "/pause")
**pause_image**=""
Image which contains the pause executable (default: "kubernetes/pause")
**registries**=""
Comma separated list of registries that will be prepended when pulling
unqualified images
## CRIO.NETWORK TABLE
**network_dir**=""
Path to CNI configuration files (default: "/etc/cni/net.d/")
**plugin_dir**=""
Path to CNI plugin binaries (default: "/opt/cni/bin/")
# SEE ALSO
crio(8)
# HISTORY
Oct 2016, Originally compiled by Aleksa Sarai <asarai@suse.de>
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