enable pod affinity for postgres instances, increase volume size

Author: Yannic Nevado Hidalgo

manifests/configmap.yaml

@@ -23,7 +23,7 @@ data:
   # enable_admin_role_for_users: "true"
   # enable_database_access: "true"
   enable_master_load_balancer: "true"
-  # enable_pod_antiaffinity: "false"
+  enable_pod_antiaffinity: "true"
   # enable_pod_disruption_budget: "true"
   enable_replica_load_balancer: "true"
   # enable_shm_volume: "true"

manifests/postgres-instance.yaml

@@ -16,7 +16,7 @@ spec:
   teamId: "Postgres"
   # size and accessmode(=defined in storageclass) for persistent volume claim
   volume:
-    size: 1Gi
+    size: 15Gi
     storageClass: standard
   # number of pods
   # 1 is master, others replicas
@@ -30,7 +30,6 @@ spec:
   # define some database with its owner
   databases:
     foo: zalando  # dbname: owner
-    test: zalando
   # needed for shared_memory, in docker default=64mb 
   enableShmVolume: true
   allowedSourceRanges:  # load balancers' source ranges for both master and replica services
@@ -42,18 +41,18 @@ spec:
     parameters:
       listen_addresses: '*'
       shared_buffers: "128MB"
-      max_connections: "10"
+      max_connections: "100"
       log_statement: "all"
       log_destination: "stderr"
       log_directory: "/var/log/postgresql"
   # define the minimum and limit of resources of an postgres database container 
   resources:
     requests:
-      cpu: 15m
-      memory: 150Mi
+      cpu: 100m
+      memory: 275Mi
     limits:
       cpu: 300m
-      memory: 275Mi
+      memory: 300Mi
   # parameters for initializing database    
   patroni:
     initdb:

manifests/postgres-operator.yaml

@@ -27,10 +27,10 @@ spec:
         resources:
           requests:
             cpu: 500m
-            memory: 250Mi
+            memory: 125Mi
           limits:
-            cpu: 2000m
-            memory: 500Mi
+            cpu: 1000m
+            memory: 250Mi
         # define at which user the postgres-operator container will run    
         securityContext:
           runAsUser: 1000

pg_bench

@@ -0,0 +1,30 @@
+$ psql -d postgres -U postgres -c "DROP DATABASE IF EXISTS test"
+
+# Testdatenbank mti dem Namen test_container erstellen
+$ psql -d postgres -U postgres -c "CREATE DATABASE test"
+
+# -i = initialize 
+# -s = scale default database value(16MB) * 50 = 800MB
+# time = measure the time for executing the command
+$ time pgbench -i -s 50 test -U postgres (~30min 51sec.)
+
+table                   # of rows
+---------------------------------
+pgbench_branches        50
+pgbench_tellers         500
+pgbench_accounts        5.000.000
+pgbench_history         0
+
+# c = clients -> number of clients to connect with
+# j = threads -> number of worker processes for pgbench
+# t = transactions -> number of transactions per client session => 10*100.000 = 1.000.000 transactions
+# -t 100000 -> nach 42min abgebrochen -> ram const stabil unter req; cpu const. über req
+# -t 10000 -> number of transactions per client session => 10*10.000 = 100.000 transactions
+$ time pgbench -c 10 -j 2 -t 10000 test -U postgres
+
+
+# kill database with to much ressourcen
+$ pgbench -c 90 -j 10 -t 100000 test -U postgres
+
+# get size of database
+SELECT pg_size_pretty( pg_database_size('test') );

reset_postgres_operator_setup.sh

@@ -6,16 +6,20 @@ kubectl delete clusterroles zalando-postgres-operator -n zalando-postgres
 
 kubectl delete clusterrolebindings zalando-postgres-operator -n zalando-postgres
 
-kubectl delete serviceaccounts  zalando-postgres-operator -n zalando-postgres
+kubectl delete serviceaccounts zalando-postgres-operator -n zalando-postgres
 
 kubectl delete secrets foo-user.postgres-instance.credentials postgres.postgres-instance.credentials standby.postgres-instance.credentials zalando.postgres-instance.credentials -n zalando-postgres
 
 kubectl delete configmaps postgres-operator -n zalando-postgres
 
 kubectl delete postgresql postgres-instance -n zalando-postgres
 
-kubectl delete service postgres-instance postgres-instance-repl -n zalando-postgres
+sleep 3
 
-kubectl delete poddisruptionbudgets postgres-acid-minimal-cluster-pdb -n zalando-postgres
+kubectl delete service postgres-instance postgres-instance-config postgres-instance-repl -n zalando-postgres
+
+# sleep 3
+
+# kubectl delete poddisruptionbudgets postgres-acid-minimal-cluster-pdb -n zalando-postgres
 
 # kubectl delete pvc pgdata-acid-minimal-cluster-0 pgdata-acid-minimal-cluster-1 pgdata-acid-minimal-cluster-2 -n zalando-postgres