(postgresql) set db admin password at startup

- Make the default to run the postgres database as the uid 999 which
  the default image maps to the 'postgres' user

- If the database is already initialized, before starting postgres
  set the 'postgres' database user password to match the declared
  intended password

Change-Id: I7b0ea7a86246b098f38ef4c03dd157731f61e066

postgresql/templates/bin/_start.sh.tpl

@@ -16,6 +16,25 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */}}
 
-set -ex
+# Disable echo mode while setting the password
+# unless we are in debug mode
+{{- if .Values.conf.debug }}
+set -x
+{{- end }}
+set -e
 
-exec /docker-entrypoint.sh postgres -N {{ .Values.conf.postgresql.max_connections }} -B {{ .Values.conf.postgresql.shared_buffers }}
+POSTGRES_DB=${POSTGRES_DB:-"postgres"}
+
+# Check if the Postgres data directory exists before attempting to
+# set the password
+if [[ -d "$PGDATA" && -s "$PGDATA/PG_VERSION" ]]
+then
+  postgres --single -D "$PGDATA" "$POSTGRES_DB" <<EOF
+ALTER ROLE $POSTGRES_USER WITH PASSWORD '$POSTGRES_PASSWORD'
+EOF
+
+fi
+
+set -x
+
+exec /docker-entrypoint.sh postgres -N {{ .Values.conf.postgresql.max_connections | quote }} -B {{ .Values.conf.postgresql.shared_buffers | quote }}

postgresql/templates/statefulset.yaml

@@ -40,6 +40,8 @@ spec:
 {{ tuple $envAll "postgresql" "server" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 8 }}
     spec:
       serviceAccountName: {{ $serviceAccountName }}
+      securityContext:
+{{ toYaml $envAll.Values.pod.security.server | indent 8 }}
       affinity:
 {{ tuple $envAll "postgresql" "server" | include "helm-toolkit.snippets.kubernetes_pod_anti_affinity" | indent 8 }}
       nodeSelector:

postgresql/values.yaml

@@ -19,6 +19,10 @@
 release_group: null
 
 pod:
+  security:
+    server:
+      runAsUser: 999
+      allowPrivilegeEscalation: false
   affinity:
     anti:
       type:
@@ -141,6 +145,7 @@ monitoring:
       scrape: true
 
 conf:
+  debug: false
   postgresql:
     max_connections: 100
     shared_buffers: 128MB