Merge pull request #3 from ghusta/feature/issue-2

Feature/issue 2

.gitattributes

@@ -0,0 +1,3 @@
+*                       text=auto
+*.sh                    text eol=lf
+docker-healthcheck      text eol=lf

.travis.yml

@@ -10,6 +10,7 @@ install:
 
 script:
   - docker build --tag ghusta/postgres-world-db .
+  - docker inspect --format="{{json .Config.Healthcheck}}" ghusta/postgres-world-db
 
 after_success:
   - docker image ls

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Change Log
 
+## 2.2.1 (2018-08-13)
+Add HEALTHCHECK in Dockerfile (#2).
+
 ## 2.2 (2017-10-06)
 Upgrade to PostgreSQL 10.  
 See https://www.postgresql.org/about/news/1786/ 

Dockerfile

@@ -10,3 +10,7 @@ ADD scripts/*.sql /docker-entrypoint-initdb.d/
 
 # Copier les scripts d'init dans : 
 #ADD scripts/*.sh /docker-entrypoint-initdb.d/
+
+COPY docker-healthcheck /usr/local/bin/
+
+HEALTHCHECK CMD ["docker-healthcheck"]

docker-healthcheck

@@ -0,0 +1,21 @@
+#!/bin/bash
+set -eo pipefail
+
+host="$(hostname -i || echo '127.0.0.1')"
+user="${POSTGRES_USER:-postgres}"
+db="${POSTGRES_DB:-$POSTGRES_USER}"
+export PGPASSWORD="${POSTGRES_PASSWORD:-}"
+
+args=(
+	# force postgres to not use the local unix socket (test "external" connectibility)
+	--host "$host"
+	--username "$user"
+	--dbname "$db"
+	--quiet --no-align --tuples-only
+)
+
+if select="$(echo 'SELECT 1' | psql "${args[@]}")" && [ "$select" = '1' ]; then
+	exit 0
+fi
+
+exit 1