Commit a5d72192 authored by Dave Lane's avatar Dave Lane
Browse files

initial commit of backup script

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#!/bin/bash
#
# This script dumps the PostgreSQL db in a Docker container
# managed by Docker Compose using the selected command within
# the database container and pipes the results into an
# appropriately named/dated file...
#
# It also manages rolling out older backups to avoid filling
# your storage...
#
# Default retention
BU_TO_KEEP_HOURLY=24
BU_TO_KEEP_DAILY=7
BU_TO_KEEP_WEEKLY=4
BU_TO_KEEP_MONTHLY=12
BU_TO_KEEP_YEARLY=7
#
BU_FROOT=alldbs
BU_FROOT_HOURLY=hourly
BU_FROOT_DAILY=daily
BU_FROOT_WEEKLY=weekly
BU_FROOT_MONTHLY=monthly
BU_FROOT_YEARLY=yearly
#
# this can be overridden at invocation
BU_CONF=default-docker-compose.conf
# # output for debugging...
VERBOSE=1
#
# Stuff that should be universal for this install...
# where we can find this app...
MAIN_DIR=/etc/dbbackup
# determine today's date
DATE=`date '+%Y-%m-%d-%a'`
# determine today's date
TIME=`date '+%H-%M-%S'`
# temporary holding point for email
TMP_EMAIL=/tmp/tmp_dbbackup_email.$DATE_$TIME
# log file
LOG=/var/log/dbbackup.log
#
# Commands
# gzip command
GZIP=`which gzip`
# grep command
GREP=`which grep`
# email program
MAIL=`which mail`
# database dump utility
DC=`which docker-compose`
#DEF_ARGS="-C -d -O -x"
#
# pattern for "ls" command to build list of
# pruneable backup files...
# -1t = 1 column, ordered by time of last mod
PRUNEABLES_CMD="ls -1t"
# function to direct a message...
message() {
#
# a timestamp for logging purposes
TIMESTAMP=`date '+%Y-%m-%d %H:%M.%S'`
echo "$0: $TIMESTAMP $@" >> $LOG
if test -f $TMP_EMAIL ; then
echo "$0: $TIMESTAMP $@" >> $TMP_EMAIL
fi
verbose "$TIMESTAMP $@"
}
# create the temporary email file
create_tmp_email() {
touch $TMP_EMAIL
if test -f $TMP_EMAIL ; then
message "created temporary email $TMP_EMAIL"
else
message "failed to create temporary email $TMP_EMAIL"
fi
}
# send the contents of the temporary file to the
# designated report recipient
send_email_report() {
if test -f $TMP_EMAIL ; then
message "sending email report to $EMAIL"
$MAIL -s "$EMAIL_SUBJ" $EMAIL < $TMP_EMAIL
rm $TMP_EMAIL
if test -f $TMP_EMAIL ; then
message "failed to remove temporary email $TMP_EMAIL"
else
message "successfully removed temporary email $TMP_EMAIL"
fi
message "email report successfully sent"
fi
}
# insert a blank line into the log and on the console
insert_blank() {
echo "" >> $LOG
verbose ""
}
# function to direct a message...
verbose() {
if test $VERBOSE = 1 ; then
echo "$@"
fi
}
#
# delete old backups
delete_old() {
#
if test -n $BU_FROOT && test -n $BU_TO_KEEP ; then
# pattern to search for to build the list...
PATTERN="$BU_DIR/$BU_FROOT-*.*"
# build the list, with the suffix...
PRUNEABLES=`$PRUNEABLES_CMD $PATTERN`
if test "$?" -eq "0" ; then
message "pruning older files based on $PATTERN.$BU_SUFFIX"
message "keeping last $BU_TO_KEEP backups"
#
# set counter
NUM=0
# go through the list of files and remove those we don't want
for PRUNEABLE in $PRUNEABLES
do
NUM=$(($NUM + 1))
if test $NUM -gt $BU_TO_KEEP ; then
message "deleting $PRUNEABLE"
rm $PRUNEABLE 2>&1 > /dev/null
else
message "keeping $PRUNEABLE"
fi
done
fi
else
message "keeping older backups, missing backup_root_filename..."
fi
}
#
#
do_backup() {
FILE=$1
VER=`$DC exec $DC_CONTAINER pg_config --version`
verbose "Postgres version $VER - echoing to backup: $FILE"
echo "--" > $FILE
echo "-- PostgreSQL Version: $VER" >> $FILE
echo "--" >> $FILE
echo "" >> $FILE
CMD="$DC exec $DC_CONTAINER $DUMP_CMD"
verbose "doing database dump: $CMD"
$CMD >> $FILE
}
#
# cycle through the command line options
while test $# -ne 0 ; do
case $1 in
--config|-c)
shift # shift from the flag to the value
verbose "setting configuration directory to $1"
BU_CONF=$1
;;
--hourly|-h)
verbose "running hourly backup"
TASK=HOURLY
;;
--daily|-d)
verbose "running daily backup"
TASK=DAILY
;;
--weekly|-w)
verbose "running weekly backup"
TASK=WEEKLY
;;
--monthly|-m)
verbose "running monthly backup"
TASK=MONTHLY
;;
--yearly|-y)
verbose "running yearly backup"
TASK=YEARLY
;;
esac
shift
done
#
#
# create the blank email report
#create_tmp_email
#
if test -f $BU_CONF ; then
verbose "Reading default in $BU_CONF"
source $BU_CONF
else
error "Couldn't find or read $BU_CONF"
exit 1
fi
#
# run through the various tasks
verbose "using configuration file $BU_CONF"
# go to the Docker Compose directory where we need to be to run the
# docker-compose commands
verbose "going to $DC_DIR"
OLD_DIR=`pwd`
cd $DC_DIR
#
# run the backup...
#
# a timestamp for logging purposes
STAMP=`date '+%Y-%m-%d_%H-%M-%S'`
# delete stale backups
#
# delete_old
#
# generate the filename
INC="BU_FROOT_$TASK"
FILENAME=$BU_FROOT-${!INC}-$STAMP.sql
FILEPATH=$BU_DIR/$FILENAME
message "backing up all the databases into $FILEPATH"
# dump the data into the file
#
do_backup $FILEPATH
#
message "completed backup"
# compress the backup
message "compressing $FILEPATH"
$GZIP $BU_DIR/$FILEPATH
# return to where you started from...
cd $OLD_DIR
#
# sent resulting email report
#
#send_email_report
exit 0
#
# SQL dump backup directory
#
BU_DIR=/home/data/mastodon/backup
#
# Docker Compose details
#
# dir containing the docker-compose.yml
DC_DIR=/home/docker/mastodon-2.0.0
# name of the database container
DC_CONTAINER=postgres
# Command to dump the relevant database(s)
DUMP_CMD='pg_dumpall -c -U postgres'
#
# Reporting
#
# email address to send reports to, and subject
EMAIL=webmaster@oerfoundation.org
EMAIL_SUBJ="Mastodon (on Open) Postgres Backup Report"
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