Check for host availability before backup

Author: tiredofit

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 1.16 - 2019-06-16 - <dave at tiredofit dot ca>
+
+* Check to see if Database Exists before performing backup
+* Fix for MysQL/MariaDB custom ports - Credit to <spumer@github>
+
 ## 1.15 - 2019-05-24 - <claudioaltamura @ github>
 
 * Added abaility to backup password protected Redis Hosts

Dockerfile

@@ -36,7 +36,7 @@ COPY --from=mongo-packages / /usr/src/apk
        apk add \
            pixz@testing \
            && \
-        
+       \        
        ## Locally Install Mongo Package
        cd /usr/src/apk && \
        apk add -t .db-backup-mongo-deps --allow-untrusted \

README.md

@@ -1,4 +1,4 @@
-# tiredofit/db-backup
+# hub.docker.com/r/tiredofit/db-backup
 
 
 [![Build Status](https://img.shields.io/docker/build/tiredofit/db-backup.svg)](https://hub.docker.com/r/tiredofit/db-backup)
@@ -23,7 +23,7 @@ Currently backs up CouchDB, InfluxDB, MySQL, MongoDB Postgres, Redis, Rethink se
 * select how often to run a dump
 * select when to start the first dump, whether time of day or relative to container start time
 
-This Container uses Alpine:Edge as a base.
+* This Container uses a [customized Alpine Linux base](https://hub.docker.com/r/tiredofit/alpine) which includes [s6 overlay](https://github.com/just-containers/s6-overlay) enabled for PID 1 Init capabilities, [zabbix-agent](https://zabbix.org) based on `3.4` compiled for individual container monitoring, Cron also installed along with other tools (bash,curl, less, logrotate, nano, vim) for easier management. It also supports sending to external SMTP servers
 
 [Changelog](CHANGELOG.md)
 
@@ -56,7 +56,7 @@ method of installation.
 
 
 ```bash
-docker pull tiredofit/db-backup
+docker pull tiredofit/db-backup:latest
 ```
 
 # Quick Start
@@ -92,6 +92,7 @@ Along with the Environment Variables from the [Base image](https://hub.docker.co
 | `DB_NAME` | Schema Name e.g. `database`
 | `DB_USER` | username for the database - use `root` to backup all MySQL of them.
 | `DB_PASS` | (optional if DB doesn't require it) password for the database
+| `DB_PORT` | (optional) Set port to connect to DB_HOST. Defaults are provided
 | `DB_DUMP_FREQ` | How often to do a dump, in minutes. Defaults to 1440 minutes, or once per day.
 | `DB_DUMP_BEGIN` | What time to do the first dump. Defaults to immediate. Must be in one of two formats
 | | Absolute HHMM, e.g. `2330` or `0415`

install/etc/s6/services/10-db-backup/run

@@ -193,6 +193,78 @@ function backup_rethink() {
     move_backup
 }
 
+function check_availability() {
+### Set the Database Type
+   case "$DBTYPE" in
+        "couch" )
+            COUNTER=0
+            while ! (nc -z ${DBHOST} ${DBPORT}) ; do
+                sleep 5
+                let COUNTER+=5
+                echo "** [db-backup] CouchDB Host '"$DBHOST"' is not accessible, retrying.. ($COUNTER seconds so far)"
+            done
+        ;;
+        "influx" )
+            COUNTER=0
+            while ! (nc -z ${DBHOST} ${DBPORT}) ; do
+                sleep 5
+                let COUNTER+=5
+                echo "** [db-backup] InfluxDB Host '"$DBHOST"' is not accessible, retrying.. ($COUNTER seconds so far)"
+            done
+        ;;
+        "mongo" )
+            COUNTER=0
+            while ! (nc -z ${DBHOST} ${DBPORT}) ; do
+                sleep 5
+                let COUNTER+=5
+                echo "** [db-backup] Mongo Host '"$DBHOST"' is not accessible, retrying.. ($COUNTER seconds so far)"
+            done
+        ;;
+        "mysql" )
+            COUNTER=0
+            while true; do
+                mysqlcmd='mysql -u'${DBUSER}' -P '${DBPORT}' -h '${DBHOST}' -p'${DBPASS}
+                out="`$mysqlcmd -e "SELECT COUNT(*) FROM information_schema.FILES;" 2>&1`"
+                echo "$out" | grep -E "COUNT|Enter" 2>&1 > /dev/null
+                if [ $? -eq 0 ]; then
+                    :
+                    break
+                fi
+                echo "** [db-backup] MySQL/MariaDB Server "$DBHOST" is not accessible, retrying.. ($COUNTER seconds so far)"
+                sleep 5
+                let COUNTER+=5
+            done
+        ;;
+        "pgsql" )
+            # Wait until mongo logs that it's ready (or timeout after 60s)
+            COUNTER=0
+            export PGPASSWORD=${DBPASS} 
+            until pg_isready --dbname=${DBNAME} --host=${DBHOST} --port=${DBPORT} --username=${DBUSER} -q
+            do
+                sleep 5
+                let COUNTER+=5
+                echo "** [db-backup] Postgres Host '"$DBHOST"' is not accessible, retrying.. ($COUNTER seconds so far)"
+            done
+        ;;
+        "redis" )
+            COUNTER=0
+            while ! (nc -z ${DBHOST} ${DBPORT}) ; do
+                sleep 5
+                let COUNTER+=5
+                echo "** [db-backup] Redis Host '"$DBHOST"' is not accessible, retrying.. ($COUNTER seconds so far)"
+            done
+        ;;
+        "rethink" )
+            COUNTER=0
+            while ! (nc -z ${DBHOST} ${DBPORT}) ; do
+                sleep 5
+                let COUNTER+=5
+                echo "** [db-backup] RethinkDB Host '"$DBHOST"' is not accessible, retrying.. ($COUNTER seconds so far)"
+            done
+        ;;
+    esac    
+}
+
 function compression() {
    case "$COMPRESSION" in
         "GZ" | "gz" | "gzip" | "GZIP")
@@ -258,24 +330,31 @@ echo '** [db-backup] Initialized at at '$(date)
 ### Take a Dump
        case "$DBTYPE" in
         "couch" )
+        check_availability
         backup_couch
         ;;
         "influx" )
+        check_availability
         backup_influx
         ;;
         "mysql" )
+        check_availability
         backup_mysql
         ;;
         "mongo" )
+        check_availability
         backup_mongo
         ;;
         "pgsql" )
+        check_availability
         backup_pgsql
         ;;
         "redis" )
+        check_availability
         backup_redis
         ;;
         "rethink" )
+        check_availability
         backup_rethink
         ;;
         esac