docker: remove kernel check

Only CentOS 7 uses Linux 3.10, all other OSs have more recent kernels

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

roles/container-engine/docker/tasks/main.yml

@@ -37,16 +37,6 @@
   tags:
     - facts
 
-- name: check for minimum kernel version
-  fail:
-    msg: >
-          docker requires a minimum kernel version of
-          {{ docker_kernel_min_version }} on
-          {{ ansible_distribution }}-{{ ansible_distribution_version }}
-  when: (not ansible_os_family in ["Flatcar Container Linux by Kinvolk", "ClearLinux"]) and (ansible_kernel is version(docker_kernel_min_version, "<"))
-  tags:
-    - facts
-
 - name: disable unified_cgroup_hierarchy in Fedora 31+
   command: grubby --update-kernel=ALL --args="systemd.unified_cgroup_hierarchy=0"
   when:

roles/container-engine/docker/vars/amazon.yml

@@ -1,6 +1,4 @@
 ---
-docker_kernel_min_version: '0'
-
 # https://docs.aws.amazon.com/en_us/AmazonECS/latest/developerguide/docker-basics.html
 
 docker_versioned_pkg:

roles/container-engine/docker/vars/debian.yml

@@ -1,6 +1,4 @@
 ---
-docker_kernel_min_version: '3.10'
-
 # https://download.docker.com/linux/debian/
 docker_versioned_pkg:
   'latest': docker-ce

roles/container-engine/docker/vars/fedora.yml

@@ -1,6 +1,4 @@
 ---
-docker_kernel_min_version: '0'
-
 # https://docs.docker.com/install/linux/docker-ce/fedora/
 # https://download.docker.com/linux/fedora/<fedora-version>/x86_64/stable/Packages/
 docker_versioned_pkg:

roles/container-engine/docker/vars/redhat.yml

@@ -1,6 +1,4 @@
 ---
-docker_kernel_min_version: '0'
-
 # https://docs.docker.com/engine/installation/linux/centos/#install-from-a-package
 # https://download.docker.com/linux/centos/<centos_version>>/x86_64/stable/Packages/
 # or do 'yum --showduplicates list docker-engine'

roles/container-engine/docker/vars/suse.yml

@@ -1,6 +1,4 @@
 ---
-docker_kernel_min_version: '0'
-
 docker_package_info:
   pkg_mgr: zypper
   pkgs:

roles/container-engine/docker/vars/ubuntu.yml

@@ -1,6 +1,4 @@
 ---
-docker_kernel_min_version: '3.10'
-
 # https://download.docker.com/linux/ubuntu/
 docker_versioned_pkg:
   'latest': docker-ce