kill long queries

docker-compose.yml

@@ -2,8 +2,10 @@ version: '3.4'
 
 services:
   db:
-    image: postgres:11.6-alpine
-    container_name: postgres
+    build:
+      context: ./src
+      dockerfile: Dockerfile-postgresql
+    container_name: edb-postgres
     restart: always
     environment:
      - POSTGRES_PASSWORD
@@ -16,6 +18,7 @@ services:
     build:
       context: ./src
       dockerfile: Dockerfile
+    container_name: edb-adminer
     restart: always
     environment:
      - ADMINER_PLUGINS=account-nolock-plugin

src/Dockerfile-postgresql

+from postgres:11.6-alpine
+RUN mkdir /home/postgres
+COPY postgres-crontab /home/postgres/.
+COPY kill-long-running-queries.sh /home/postgres/.
+COPY start-cron.sh /start-cron.sh
+RUN chown -R postgres:postgres /home/postgres && \
+    chmod 755 /home/postgres/kill-long-running-queries.sh && \
+    crontab -u postgres /home/postgres/postgres-crontab && \
+    chmod 755 /start-cron.sh
+
+CMD  /start-cron.sh && su -c postgres postgres

src/kill-long-running-queries.sh

+#!/bin/bash
+set -e
+
+/usr/local/bin/psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+  SELECT
+    pg_cancel_backend(pid)
+  FROM pg_stat_activity
+  WHERE (now() - pg_stat_activity.query_start) > interval '20 seconds'
+        and state='active';
+EOSQL

src/postgres-crontab

+# min   hour    day     month   weekday command
+*    *       *       *       *       /home/postgres/kill-long-running-queries.sh >>/dev/null 

src/start-cron.sh

+#!/bin/sh
+
+# start cron
+/usr/sbin/crond -f -l 8 &