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restart instances via rest api instead of recreating pods, fixes bug with being unable to decrease some values, like max_connections (#1103)

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* restart instances via rest api instead of recreating pods
* Ignore differences in bootstrap.dcs when compare SPILO_CONFIGURATION
* isBootstrapOnlyParameter is rewritten, instead of whitelist it uses blacklist
* added e2e test for max_connections decreasing
* documentation updated
* pending_restart flag added to restart api call, wait fot ttl seconds after restart
* refactoring, /restart returns error if pending_restart is set to true and patroni is not pending restart
* restart postgresql instances within pods only if pod's restart is not required
* patroni might need to restart postgresql after pods were recreated if values like max_connections decreased
* instancesRestart is not critical, try to restart pods if not successful
* cleanup

Co-authored-by: Felix Kunde <felix-kunde@gmx.de>
This commit is contained in:
Igor Yanchenko
2021-06-14 11:00:58 +02:00
committed by GitHub
co-authored by Felix Kunde
parent 75a9e2be38
commit ebb3204cdd
8 changed files with 438 additions and 17 deletions
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pkg/cluster/k8sres.go
+27 -7
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@@ -412,13 +412,33 @@ func tolerations(tolerationsSpec *[]v1.Toleration, podToleration map[string]stri
// Those parameters must go to the bootstrap/dcs/postgresql/parameters section.
// See http://patroni.readthedocs.io/en/latest/dynamic_configuration.html.
func isBootstrapOnlyParameter(param string) bool {
return param == "max_connections" ||
param == "max_locks_per_transaction" ||
param == "max_worker_processes" ||
param == "max_prepared_transactions" ||
param == "wal_level" ||
param == "wal_log_hints" ||
param == "track_commit_timestamp"
params := map[string]bool{
"archive_command": false,
"shared_buffers": false,
"logging_collector": false,
"log_destination": false,
"log_directory": false,
"log_filename": false,
"log_file_mode": false,
"log_rotation_age": false,
"log_truncate_on_rotation": false,
"ssl": false,
"ssl_ca_file": false,
"ssl_crl_file": false,
"ssl_cert_file": false,
"ssl_key_file": false,
"shared_preload_libraries": false,
"bg_mon.listen_address": false,
"bg_mon.history_buckets": false,
"pg_stat_statements.track_utility": false,
"extwlist.extensions": false,
"extwlist.custom_path": false,
}
result, ok := params[param]
if !ok {
result = true
}
return result
}
func generateVolumeMounts(volume acidv1.Volume) []v1.VolumeMount {