turbot/kubernetes
steampipe plugin install kubernetes

Table: kubernetes_replication_controller - Query Kubernetes Replication Controllers using SQL

Kubernetes Replication Controllers are a core component of Kubernetes that ensure a specified number of pod replicas are running at any given time. They are particularly useful for stateless applications where more instances can be easily created or destroyed. Replication Controllers supersede the functionality of Kubernetes Pods by adding life-cycle control, system introspection, and self-healing mechanisms.

Table Usage Guide

The kubernetes_replication_controller table provides insights into Replication Controllers within Kubernetes. As a DevOps engineer, you can explore controller-specific details through this table, including its status, configuration, and specifications. Utilize it to manage and monitor the state of your Kubernetes environment, ensuring the desired number of pod replicas are always running.

Examples

Basic Info

Explore the status of your Kubernetes replication controllers to understand the current state of your system. This can help you assess the number of desired, current, and ready replicas, and determine the age and selector details of each controller.

select
name,
namespace,
replicas as desired,
status_replicas as current,
ready_replicas as ready,
age(current_timestamp, creation_timestamp),
selector
from
kubernetes_replication_controller;
select
name,
namespace,
replicas as desired,
status_replicas as current,
ready_replicas as ready,
(julianday('now') - julianday(creation_timestamp)) as age,
selector
from
kubernetes_replication_controller;

Get details of containers and image

Explore the intricacies of your Kubernetes replication controllers by identifying the associated containers and images. This enables you to better understand the structure of your deployment, facilitating more effective management and troubleshooting.

select
name,
namespace,
jsonb_agg(container.value -> 'name') as containers,
jsonb_agg(container.value -> 'image') as images
from
kubernetes_replication_controller,
jsonb_array_elements(template -> 'spec' -> 'containers') as container
group by
name,
namespace;
select
name,
namespace,
json_group_array(json_extract(container.value, '$.name')) as containers,
json_group_array(json_extract(container.value, '$.image')) as images
from
kubernetes_replication_controller,
json_each(json_extract(template, '$.spec.containers')) as container
group by
name,
namespace;

List manifest resources

Explore the Kubernetes replication controllers with a specified path to understand their names, namespaces, and desired replicas. This can help in managing and monitoring the distribution and replication of workloads in a Kubernetes environment.

select
name,
namespace,
replicas as desired,
selector,
path
from
kubernetes_replication_controller
where
path is not null;
select
name,
namespace,
replicas as desired,
selector,
path
from
kubernetes_replication_controller
where
path is not null;

Control examples

Schema for kubernetes_replication_controller

NameTypeOperatorsDescription
_ctxjsonbSteampipe context in JSON form.
annotationsjsonbAnnotations is an unstructured key value map stored with a resource that may be set by external tools to store and retrieve arbitrary metadata.
available_replicasbigintThe number of available replicas (ready for at least minReadySeconds) for this replica set.
conditionsjsonbRepresents the latest available observations of a replication controller's current state.
context_nametextKubectl config context name.
creation_timestamptimestamp with time zoneCreationTimestamp is a timestamp representing the server time when this object was created.
deletion_grace_period_secondsbigintNumber of seconds allowed for this object to gracefully terminate before it will be removed from the system. Only set when deletionTimestamp is also set.
deletion_timestamptimestamp with time zoneDeletionTimestamp is RFC 3339 date and time at which this resource will be deleted.
end_linebigintThe path to the manifest file.
finalizersjsonbMust be empty before the object is deleted from the registry. Each entry is an identifier for the responsible component that will remove the entry from the list. If the deletionTimestamp of the object is non-nil, entries in this list can only be removed.
fully_labeled_replicasbigintThe number of pods that have labels matching the labels of the pod template of the replicaset.
generate_nametextGenerateName is an optional prefix, used by the server, to generate a unique name ONLY IF the Name field has not been provided.
generationbigintA sequence number representing a specific generation of the desired state.
labelsjsonbMap of string keys and values that can be used to organize and categorize (scope and select) objects. May match selectors of replication controllers and services.
min_ready_secondsbigintMinimum number of seconds for which a newly created pod should be ready without any of its container crashing, for it to be considered available. Defaults to 0
nametextName of the object. Name must be unique within a namespace.
namespacetextNamespace defines the space within which each name must be unique.
observed_generationbigintReflects the generation of the most recently observed replication controller.
owner_referencesjsonbList of objects depended by this object. If ALL objects in the list have been deleted, this object will be garbage collected. If this object is managed by a controller, then an entry in this list will point to this controller, with the controller field set to true. There cannot be more than one managing controller.
pathtextThe path to the manifest file.
ready_replicasbigintThe number of ready replicas for this replica set.
replicasbigintReplicas is the number of desired replicas. Defaults to 1.
resource_versiontextAn opaque value that represents the internal version of this object that can be used by clients to determine when objects have changed.
selectorjsonbSelector is a label query over pods that should match the replica count. Label keys and values that must match in order to be controlled by this replica set.
selector_querytextA query string representation of the selector.
source_typetextThe source of the resource. Possible values are: deployed and manifest. If the resource is fetched from the spec file the value will be manifest.
sp_connection_nametextSteampipe connection name.
sp_ctxjsonbSteampipe context in JSON form.
start_linebigintThe path to the manifest file.
status_replicasbigintThe most recently oberved number of replicas.
tagsjsonbA map of tags for the resource. This includes both labels and annotations.
templatejsonbTemplate is the object that describes the pod that will be created if insufficient replicas are detected.
titletextTitle of the resource.
uidtextUID is the unique in time and space value for this object.

Export

This table is available as a standalone Exporter CLI. Steampipe exporters are stand-alone binaries that allow you to extract data using Steampipe plugins without a database.

You can download the tarball for your platform from the Releases page, but it is simplest to install them with the steampipe_export_installer.sh script:

/bin/sh -c "$(curl -fsSL https://steampipe.io/install/export.sh)" -- kubernetes

You can pass the configuration to the command with the --config argument:

steampipe_export_kubernetes --config '<your_config>' kubernetes_replication_controller