Custom Postgres Configuration

While StackGres comes with a carefully tuned, default Postgres configuration, you may want to set your own configuration and parameters. StackGres uses for this purpose the CRD SGPostgresConfig. By using a CRD, coupled with a webhook validator, instead of a simple ConfigMap, StackGres is able to strongly validate the desired configuration, ensuring that parameters and values are valid for the major Postgres version, and within bounds.

Configurations are assigned a name, which you may reference later from one or more Postgres clusters. Create the file sgpostgresconfig-config1.yaml:

apiVersion: stackgres.io/v1
kind: SGPostgresConfig
metadata:
  namespace: demo
  name: pgconfig1
spec:
  postgresVersion: "12"
  postgresql.conf:
    work_mem: '16MB'
    shared_buffers: '2GB'
    random_page_cost: '1.5'
    password_encryption: 'scram-sha-256'
    log_checkpoints: 'on'
    jit: 'off'

and deploy to Kubernetes:

kubectl apply -f sgpostgresconfig-config1.yaml

You may use kubectl describe on the created resource to inspect the values that are injected (tuned by default), as well as an indication in the status field of which values are using StackGres defaults:

kubectl -n demo describe sgpgconfig pgconfig1
Name:         pgconfig1
Namespace:    demo
Labels:       <none>
Annotations:  stackgres.io/operatorVersion: 1.0.0-alpha1
API Version:  stackgres.io/v1
Kind:         SGPostgresConfig
Metadata:
  Creation Timestamp:  2021-03-01T10:07:10Z
  Generation:          1
  Resource Version:    152394
  Self Link:           /apis/stackgres.io/v1/namespaces/demo/sgpgconfigs/pgconfig1
  UID:                 46d3a5c8-6d96-4082-97f3-ae9a66c25237
Spec:
  Postgres Version:  12
  postgresql.conf:
    autovacuum_max_workers:            3
    autovacuum_vacuum_cost_delay:      2
    checkpoint_completion_target:      0.9
    checkpoint_timeout:                15min
    default_statistics_target:         200
    enable_partitionwise_aggregate:    on
    enable_partitionwise_join:         on
    Jit:                               off
    jit_inline_above_cost:             -1
    log_autovacuum_min_duration:       0
    log_checkpoints:                   on
    log_connections:                   on
    log_disconnections:                on
    log_line_prefix:                   %t [%p]: db=%d,user=%u,app=%a,client=%h 
    log_lock_waits:                    on
    log_min_duration_statement:        1000
    log_statement:                     ddl
    log_temp_files:                    0
    maintenance_work_mem:              2GB
    max_locks_per_transaction:         128
    max_pred_locks_per_transaction:    128
    max_prepared_transactions:         32
    max_replication_slots:             20
    max_wal_senders:                   20
    max_wal_size:                      2GB
    min_wal_size:                      1GB
    password_encryption:               scram-sha-256
    pg_stat_statements.track_utility:  off
    random_page_cost:                  1.5
    shared_buffers:                    2GB
    shared_preload_libraries:          pg_stat_statements, auto_explain
    superuser_reserved_connections:    8
    track_activity_query_size:         4096
    track_functions:                   pl
    track_io_timing:                   on
    wal_keep_segments:                 100
    work_mem:                          16MB
Status:
  Default Parameters:
    enable_partitionwise_aggregate
    min_wal_size
    max_wal_senders
    log_checkpoints
    max_prepared_transactions
    checkpoint_timeout
    autovacuum_max_workers
    jit_inline_above_cost
    track_functions
    wal_keep_segments
    checkpoint_completion_target
    enable_partitionwise_join
    log_autovacuum_min_duration
    superuser_reserved_connections
    log_temp_files
    log_lock_waits
    random_page_cost
    max_locks_per_transaction
    log_disconnections
    maintenance_work_mem
    log_connections
    shared_preload_libraries
    pg_stat_statements.track_utility
    track_activity_query_size
    max_pred_locks_per_transaction
    max_wal_size
    autovacuum_vacuum_cost_delay
    log_min_duration_statement
    log_statement
    max_replication_slots
    default_statistics_target
    log_line_prefix
    track_io_timing
Events:  <none>