kubespray/inventory/sample/group_vars/all/docker.yml

## Uncomment this if you want to force overlay/overlay2 as docker storage driver
## Please note that overlay2 is only supported on newer kernels
#docker_storage_options: -s overlay2

## Enable docker_container_storage_setup, it will configure devicemapper driver on Centos7 or RedHat7.
docker_container_storage_setup: false

## It must be define a disk path for docker_container_storage_setup_devs.
## Otherwise docker-storage-setup will be executed incorrectly.
#docker_container_storage_setup_devs: /dev/vdb

## Uncomment this if you have more than 3 nameservers, then we'll only use the first 3.
docker_dns_servers_strict: false

# Path used to store Docker data
docker_daemon_graph: "/var/lib/docker"

## Used to set docker daemon iptables options to true
docker_iptables_enabled: "false"

# Docker log options
# Rotate container stderr/stdout logs at 50m and keep last 5
docker_log_opts: "--log-opt max-size=50m --log-opt max-file=5"

# define docker bin_dir
docker_bin_dir: "/usr/bin"

# keep docker packages after installation; speeds up repeated ansible provisioning runs when '1'
# kubespray deletes the docker package on each run, so caching the package makes sense
docker_rpm_keepcache: 0

## An obvious use case is allowing insecure-registry access to self hosted registries.
## Can be ipaddress and domain_name.
## example define 172.19.16.11 or mirror.registry.io
#docker_insecure_registries:
#   - mirror.registry.io
#   - 172.19.16.11

## Add other registry,example China registry mirror.
#docker_registry_mirrors:
#   - https://registry.docker-cn.com
#   - https://mirror.aliyuncs.com

## If non-empty will override default system MounFlags value.
## This option takes a mount propagation flag: shared, slave
## or private, which control whether mounts in the file system
## namespace set up for docker will receive or propagate mounts
## and unmounts. Leave empty for system default
#docker_mount_flags:

## A string of extra options to pass to the docker daemon.
## This string should be exactly as you wish it to appear.
docker_options: >-
  {%- if docker_insecure_registries is defined %}
  {{ docker_insecure_registries | map('regex_replace', '^(.*)$', '--insecure-registry=\1' ) | list | join(' ') }}
  {%- endif %}
  {% if docker_registry_mirrors is defined %}
  {{ docker_registry_mirrors | map('regex_replace', '^(.*)$', '--registry-mirror=\1' ) | list | join(' ') }}
  {%- endif %}
  {%- if docker_version is version('17.05', '<') %}
  --graph={{ docker_daemon_graph }} {{ docker_log_opts }}
  {%- else %}
  --data-root={{ docker_daemon_graph }} {{ docker_log_opts }}
  {%- endif %}
  {%- if ansible_architecture == "aarch64" and ansible_os_family == "RedHat" %}
  --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current
  --default-runtime=docker-runc --exec-opt native.cgroupdriver=systemd
  --userland-proxy-path=/usr/libexec/docker/docker-proxy-current --signature-verification=false
  {%- endif -%}