The Kubelet Cookbook is a library cookbook that provides custom resources for use in recipes.

This cookbook is only concerned with the Kubelet node agent distributed in Kubernetes.

• Chef 14.4+
• Network accessible web server hosting the kubelet binary

The following platforms have been tested with Test Kitchen. It will most likely work on other platforms as well

|---------------+--------+--------+--------+
|               | 1.15.7 | 1.16.4 | 1.17.0 |
|---------------+--------+--------+--------+
| centos-7      |   X    |   X    |   X    |
|---------------+--------+--------+--------+
| debian-9      |   X    |   X    |   X    |
|---------------+--------+--------+--------+
| fedora-30     |   X    |   X    |   X    |
|---------------+--------+--------+--------+
| ubuntu-18.04  |   X    |   X    |   X    |
|---------------+--------+--------+--------+

• ark

• Add depends 'kubelet' to your cookbook's metadata.rb
• Use the resources shipped in cookbook in a recipe, the same way you'd use core Chef resources (file, template, directory, package, etc).

kubelet_installation_binary 'default' do
  kubelet_version '1.16.4'
  kubelet_binary_checksum 'a2f1eec9ecccebceb5032322ebc5e8cc054220c41cd4ec7b7b460cb8bfd63481'
  action :create
end

kubelet_service 'kubelet' do
  address '127.0.0.1'
  port 10250
  fail_swap_on false
  authorization_mode 'AlwaysAllow'
  anonymous_auth true
  authentication_token_webhook false
end

The cookbooks ran under test-kitchen make excellent usage examples.

The test recipes are found at:

test/cookbooks/kubelet_test/

• kubelet_installation_binary: copies a pre-compiled kubelet binary onto disk
• kubelet_installation_package: installs kubelet with an yum/apt package
• kubelet_service : creates an kubelet instance with a systemd_service

The kubelet_installation_binary resource copies the precompiled Go binaries (kubelet & cni) onto the disk.

In this example, kubelet 1.16.4 will be installed in /opt/bin and cni 0.6.0 in /opt/cni:

kubelet_installation_binary 'default' do
  kubelet_binary_checksum 'a2f1eec9ecccebceb5032322ebc5e8cc054220c41cd4ec7b7b460cb8bfd63481'
  kubelet_version '1.16.4'
  kubelet_dir '/opt/bin'
  cni_prefix_dir '/opt'
  cni_version '0.7.5'
  cni_tgz_checksum '3ca15c0a18ee830520cf3a95408be826cbd255a1535a38e0be9608b25ad8bf64'
  action :create
end

The kubelet_installation_package resource install kubelet with apt or yum package systems.

In this example, kubelet 1.15.7 will be installed:

kubelet_installation_package 'default' do
  version '1.15.7'
  action :create
end

The kubelet_service resource creates a kubelet instance (configuration & service) using the given kubelet binary path.

All the Kubelet Configuration Flags are also available :

• address, String, default: '0.0.0.0'
• allow_privileged, [TrueClass, FalseClass]
• allowed_unsafe_sysctls, String
• alsologtostderr, [TrueClass, FalseClass]
• anonymous_auth, [TrueClass, FalseClass]
• application_metrics_count_limit, Integer
• authentication_token_webhook, [TrueClass, FalseClass]
• authentication_token_webhook_cache_ttl, String
• authorization_mode, String
• authorization_webhook_cache_authorized_ttl, String
• authorization_webhook_cache_unauthorized_ttl, String
• azure_container_registry_config, String
• boot_id_file, String
• bootstrap_checkpoint_path, String
• bootstrap_kubeconfig, String
• cadvisor_port, Integer
• cert_dir, String
• cgroup_driver, String
• cgroup_root, String
• cgroups_per_qos, [TrueClass, FalseClass]
• chaos_chance, Float
• client_ca_file, String
• cloud_config, String
• cloud_provider, String
• cluster_dns, String
• cluster_domain, String
• cni_bin_dir, String, default: '/opt/cni'
• cni_conf_dir, String
• config, String, default: lazy { "#{config_dir}/config.yaml" }
• container_hints, String
• container_log_max_files, Integer
• container_log_max_size, String
• container_runtime, String
• container_runtime_endpoint, String
• containerd, String
• containerized, [TrueClass, FalseClass]
• contention_profiling, [TrueClass, FalseClass]
• cpu_cfs_quota, [TrueClass, FalseClass]
• cpu_cfs_quota_period, String
• cpu_manager_policy, String
• cpu_manager_reconcile_period, String
• docker, String
• docker_disable_shared_pid, [TrueClass, FalseClass]
• docker_endpoint, String
• docker_env_metadata_whitelist, String
• docker_only, [TrueClass, FalseClass]
• docker_root, String
• docker_tls, [TrueClass, FalseClass]
• docker_tls_ca, String
• docker_tls_cert, String
• docker_tls_key, String
• dynamic_config_dir, String
• enable_controller_attach_detach, [TrueClass, FalseClass]
• enable_debugging_handlers, [TrueClass, FalseClass]
• enable_load_reader, [TrueClass, FalseClass]
• enable_server, [TrueClass, FalseClass]
• enforce_node_allocatable, String
• event_burst, Integer
• event_qps, Integer
• event_storage_age_limit, String
• event_storage_event_limit, String
• eviction_hard, String
• eviction_max_pod_grace_period, Integer
• eviction_minimum_reclaim, String
• eviction_pressure_transition_period, String
• eviction_soft, String
• eviction_soft_grace_period, String
• exit_on_lock_contention, [TrueClass, FalseClass]
• experimental_allocatable_ignore_eviction, [TrueClass, FalseClass]
• experimental_allowed_unsafe_sysctls, String
• experimental_check_node_capabilities_before_mount, [TrueClass, FalseClass]
• experimental_kernel_memcg_notification, [TrueClass, FalseClass]
• experimental_mounter_path, String
• fail_swap_on, [TrueClass, FalseClass]
• feature_gates, Hash
• file_check_frequency, String
• global_housekeeping_interval, String
• hairpin_mode, String
• healthz_bind_address, String
• healthz_port, Integer
• host_ipc_sources, String
• host_network_sources, String
• host_pid_sources, String
• hostname_override, String
• housekeeping_interval, String
• http_check_frequency, String
• image_gc_high_threshold, Integer
• image_gc_low_threshold, Integer
• image_pull_progress_deadline, String
• image_service_endpoint, String
• iptables_drop_bit, Integer
• iptables_masquerade_bit, Integer
• keep_terminated_pod_volumes, [TrueClass, FalseClass]
• kube_api_burst, Integer
• kube_api_content_type, String
• kube_api_qps, Integer
• kube_reserved, String
• kube_reserved_cgroup, String
• kubeconfig, String
• kubelet_cgroups, String
• lock_file, String
• log_backtrace_at, String
• log_cadvisor_usage, [TrueClass, FalseClass]
• log_cadvisor_usage, [TrueClass, FalseClass]
• log_dir, String
• log_flush_frequency, String
• logtostderr, [TrueClass, FalseClass]
• machine_id_file, String
• make_iptables_util_chains, [TrueClass, FalseClass]
• manifest_url, String
• manifest_url_header, String
• master_service_namespace, String
• max_open_files, Integer
• max_pods, Integer
• maximum_dead_containers, String
• maximum_dead_containers_per_container, String
• minimum_container_ttl_duration, String
• minimum_image_ttl_duration, String
• network_plugin, String
• network_plugin_mtu, Integer
• node_ip, String
• node_labels, String
• node_status_max_images, String
• node_status_update_frequency, String
• non_masquerade_cidr, String
• oom_score_adj, Integer
• pod_cidr, String
• pod_infra_container_image, String
• pod_manifest_path, String, default: lazy { "#{config_dir}/manifests" }
• pod_max_pids, Integer
• pods_per_core, Integer
• port, Integer, default: 10250
• protect_kernel_defaults, [TrueClass, FalseClass]
• provider_id, String
• qos_reserved, String
• read_only_port, Integer
• really_crash_for_testing, [TrueClass, FalseClass]
• redirect_container_streaming, [TrueClass, FalseClass]
• register_node, [TrueClass, FalseClass]
• register_schedulable, [TrueClass, FalseClass]
• register_with_taints, String
• registry_burst, Integer
• registry_qps, Integer
• resolv_conf, String
• root_dir, String
• rotate_certificates, [TrueClass, FalseClass]
• rotate_server_certificates, [TrueClass, FalseClass]
• runonce, [TrueClass, FalseClass]
• runtime_cgroups, String
• runtime_request_timeout, String
• seccomp_profile_root, String
• serialize_image_pulls, [TrueClass, FalseClass]
• stderrthreshold, Integer
• storage_driver_buffer_duration, String
• storage_driver_db, String
• storage_driver_host, String
• storage_driver_password, String
• storage_driver_secure, [TrueClass, FalseClass]
• storage_driver_table, String
• storage_driver_user, String
• streaming_connection_idle_timeout, String
• sync_frequency, String
• system_cgroups, String
• system_reserved, String
• system_reserved_cgroup, String
• tls_cert_file, String
• tls_cipher_suites, String
• tls_min_version, String
• tls_private_key_file, String
• v, Integer
• vmodule, String
• volume_plugin_dir, String
• volume_stats_agg_period, String

In this example, a standalone instance of kubelet will be created.

kubelet_service 'kubelet' do
  address '127.0.0.1'
  port 10250
  fail_swap_on false
  authorization_mode 'AlwaysAllow'
  anonymous_auth true
  authentication_token_webhook false
  action :create
end

A /etc/kubernetes directory will be created with a kubelet config file in it. A systemd service will also be created.

• Julien Huon

Copyright | 2018, Julien Huon

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.