patroni.dcs.kubernetes module¶
- class patroni.dcs.kubernetes.CoreV1ApiProxy(use_endpoints: Optional[bool] = False, bypass_api_service: Optional[bool] = False)¶
Bases:
object
Proxy class to work with k8s_client.CoreV1Api() object
- class patroni.dcs.kubernetes.K8sClient¶
Bases:
object
- class ApiClient(bypass_api_service: Optional[bool] = False)¶
Bases:
object
- call_api(method: str, path: str, headers: Optional[Dict[str, str]] = None, body: Optional[Any] = None, _retry: Optional[Retry] = None, _preload_content: bool = True, _request_timeout: Optional[float] = None, **kwargs: Any) Union[HTTPResponse, K8sObject] ¶
- class patroni.dcs.kubernetes.K8sConfig¶
Bases:
object
- exception patroni.dcs.kubernetes.K8sConnectionFailed¶
Bases:
K8sException
- class patroni.dcs.kubernetes.Kubernetes(config: Dict[str, Any])¶
Bases:
AbstractDCS
- attempt_to_acquire_leader() bool ¶
Attempt to acquire leader lock.
Note
This method should create
/leader
key with the value_name
.The key must be created atomically. In case the key already exists it should not be overwritten and
False
must be returned.If key creation fails due to DCS not being accessible or because it is not able to process requests (hopefully temporary), the
DCSError
exception should be raised.- Returns:
True
if key has been created successfully.
- cancel_initialization() bool ¶
Removes the
initialize
key for a cluster.- Returns:
True
if successfully committed to DCS.
- client_path(path: str) str ¶
Construct the absolute key name from appropriate parts for the DCS type.
- Parameters:
path – The key name within the current Patroni cluster.
- Returns:
absolute key name for the current Patroni cluster.
- delete_cluster(*args: Any, **kwargs: Any) Any ¶
Delete cluster from DCS.
- Returns:
True
if successfully committed to DCS.
- delete_leader(last_lsn: Optional[int] = None) bool ¶
Update
optime/leader
and voluntarily remove leader key from DCS.This method should remove leader key if current instance is the leader.
- Parameters:
last_lsn – latest checkpoint location in bytes.
- Returns:
boolean result of called abstract
_delete_leader()
.
- delete_sync_state(version: Optional[str] = None) bool ¶
Patch annotations of $SCOPE-sync Endpoint or ConfigMap with empty values.
Effectively it removes “leader” and “sync_standby” annotations from the object. :param version: last known resource_version for conditional update of the object :returns: True if “delete” was successful
- get_citus_coordinator() Optional[Cluster] ¶
Load the Patroni cluster for the Citus Coordinator.
Note
This method is only executed on the worker nodes (
group!=0
) to find the coordinator.- Returns:
Select
Cluster
instance associated with the Citus Coordinator group ID.
- initialize(create_new: bool = True, sysid: str = '') bool ¶
Race for cluster initialization.
This method should atomically create
initialize
key and returnTrue
, otherwise it should returnFalse
.- Parameters:
create_new –
False
if the key should already exist (in the case we are setting the system_id).sysid – PostgreSQL cluster system identifier, if specified, is written to the key.
- Returns:
True
if key has been created successfully.
- manual_failover(leader: Optional[str], candidate: Optional[str], scheduled_at: Optional[datetime] = None, version: Optional[str] = None) bool ¶
Prepare dictionary with given values and set
/failover
key in DCS.- Parameters:
leader – value to set for
leader
.candidate – value to set for
member
.scheduled_at – value converted to ISO date format for
scheduled_at
.version – for conditional update of the key/object.
- Returns:
True
if successfully committed to DCS.
- patch_or_create_config(annotations: Dict[str, Any], resource_version: Optional[str] = None, patch: bool = False, retry: bool = True) bool ¶
- reload_config(config: Union[Config, Dict[str, Any]]) None ¶
Handles dynamic config changes.
Either cause by changes in the local configuration file + SIGHUP or by changes of dynamic configuration
- set_config_value(value: str, version: Optional[str] = None) bool ¶
Create or update
/config
key in DCS.- Parameters:
value – new value to set in the
config
key.version – for conditional update of the key/object.
- Returns:
True
if successfully committed to DCS.
- set_history_value(value: str) bool ¶
Set value for
history
in DCS.- Parameters:
value – new value of
history
key/object.- Returns:
True
if successfully committed to DCS.
- static subsets_changed(last_observed_subsets: List[K8sObject], ip: str, ports: List[K8sObject]) bool ¶
>>> ip = '1.2.3.4' >>> a = [k8s_client.V1EndpointAddress(ip=ip)] >>> s = [k8s_client.V1EndpointSubset(addresses=a)] >>> Kubernetes.subsets_changed(s, '1.2.3.5', []) True >>> s = [k8s_client.V1EndpointSubset(addresses=a, ports=[k8s_client.V1EndpointPort(protocol='TCP', port=1)])] >>> Kubernetes.subsets_changed(s, '1.2.3.4', [k8s_client.V1EndpointPort(port=5432)]) True >>> p1 = k8s_client.V1EndpointPort(name='port1', port=1) >>> p2 = k8s_client.V1EndpointPort(name='port2', port=2) >>> p3 = k8s_client.V1EndpointPort(name='port3', port=3) >>> s = [k8s_client.V1EndpointSubset(addresses=a, ports=[p1, p2])] >>> Kubernetes.subsets_changed(s, ip, [p2, p3]) True >>> s2 = [k8s_client.V1EndpointSubset(addresses=a, ports=[p2, p1])] >>> Kubernetes.subsets_changed(s, ip, [p2, p1]) False
- take_leader() bool ¶
Establish a new leader in DCS.
Note
This method should create leader key with value of
_name
andttl
ofttl
.Since it could be called only on initial cluster bootstrap it could create this key regardless, overwriting the key if necessary.
- Returns:
True
if successfully committed to DCS.
- touch_member(*args: Any, **kwargs: Any) Any ¶
Update member key in DCS.
Note
This method should create or update key with the name with
/members/
+_name
and the value of data in a given DCS.- Parameters:
data – information about an instance (including connection strings).
- Returns:
True
if successfully committed to DCS.
- update_leader(leader: Leader, last_lsn: Optional[int], slots: Optional[Dict[str, int]] = None, failsafe: Optional[Dict[str, str]] = None) bool ¶
Update
leader
key (or session) ttl and optime/leader.- Parameters:
leader –
Leader
object with information about the leader.last_lsn – absolute WAL LSN in bytes.
slots – dictionary with permanent slots
confirmed_flush_lsn
.failsafe – if defined dictionary passed to
write_failsafe()
.
- Returns:
True
ifleader
key (or session) has been updated successfully.
- watch(leader_version: Optional[str], timeout: float) bool ¶
Sleep if the current node is a leader, otherwise, watch for changes of leader key with a given timeout.
- Parameters:
leader_version – version of a leader key.
timeout – timeout in seconds.
- Returns:
if
True
this will reschedule the next run of the HA cycle.
- write_leader_optime(last_lsn: int) None ¶
Write value for WAL LSN to
optime
annotation of the leader object.- Parameters:
last_lsn – absolute WAL LSN in bytes.
- write_sync_state(leader: Optional[str], sync_standby: Optional[Collection[str]], version: Optional[str] = None) Optional[SyncState] ¶
Prepare and write annotations to $SCOPE-sync Endpoint or ConfigMap.
- Parameters:
leader – name of the leader node that manages /sync key
sync_standby – collection of currently known synchronous standby node names
version – last known resource_version for conditional update of the object
- Returns:
the new
SyncState
object or None
- exception patroni.dcs.kubernetes.KubernetesRetriableException(orig: ApiException)¶
Bases:
ApiException
- class patroni.dcs.kubernetes.ObjectCache(dcs: Kubernetes, func: Callable[[...], Any], retry: Retry, condition: Condition, name: Optional[str] = None)¶
Bases:
Thread
- run() None ¶
Method representing the thread’s activity.
You may override this method in a subclass. The standard run() method invokes the callable object passed to the object’s constructor as the target argument, if any, with sequential and keyword arguments taken from the args and kwargs arguments, respectively.