added healthcheck

Dockerfile

@@ -1,13 +1,13 @@
 FROM mariadb:10
 
-RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -q -y cron sudo automysqlbackup
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -q -y cron sudo automysqlbackup
 
 COPY mysql.cnf /etc/mysql/mariadb.conf.d/settings.cnf
 RUN chown mysql:mysql /etc/mysql/mariadb.conf.d/settings.cnf
 COPY docker-entrypoint.sh /usr/local/bin/
+COPY healthcheck.sh /usr/local/bin/
 COPY automysqlbackup /etc/default
 COPY sudoers /etc/sudoers.d/mysudoers
 
-
-#HEALTHCHECK
-
+HEALTHCHECK CMD /usr/local/bin/healthcheck.sh

README.md

@@ -1,3 +1,24 @@
+[![Build Status](https://drone.asperti.com/api/badges/paspo/docker-mariadb-backup-slave/status.svg)](https://drone.asperti.com/paspo/docker-mariadb-backup-slave)
+
+
 # docker-mariadb-backup-slave
 
-Setup a mariadb slave server with automysqlbackup
+Setup a mariadb slave server with automysqlbackup
+
+
+## Parameters
+### SERVER_ID
+This is used to customize slave server ID. The default value is 33. You should use an unique ID for each server.
+### READONLY
+When set to **1**,  the slave server is set as readonly. This is the default. If you set this variable to something different, the database will be read/write.
+### REPLICATE_DO_DB
+This is used to specify a single database to backup. It is generally advised to set this variable to the database name you want to backup.
+
+
+
+
+
+$ docker exec some-mariadb sh -c 'exec mysqldump --all-databases -uroot -p"$MYSQL_ROOT_PASSWORD"' > /some/path/on/your/host/all-databases.sql
+
+
+2019-11-24 10:57:24 0 [Warning] Neither --relay-log nor --relay-log-index were used; so replication may break when this MySQL server acts as a slave and has his hostname changed!! Please use '--log-basename=#' or '--relay-log=mysqld-relay-bin' to avoid this problem.

healthcheck.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+RES=$(mysql -uroot -p"$MYSQL_ROOT_PASSWORD" -e 'SHOW SLAVE STATUS\G' | egrep '(Slave_IO_Running|Slave_SQL_Running):' | awk -F: '{print $2}' | tr '\n' ',')
+if [ "$RES" = " Yes, Yes," ]; then
+    exit 0
+fi
+exit 1
+