backup-mongo.sh

#!/usr/bin/env bash

BAKDIR=/tmp/backup

prereqs () {
cat << EOF
${0} assumes you have the following components:

   * tar
   * s3cmd configured (run s3cmd --configure)
   * mongo
   * mongodump

EOF
}
usage () {
cat << EOF
usage: ${0} [OPTIONS]

OPTIONS:
   -d | --database             mongo database name
   -b | --bucket               s3 bucket
   -l | --localonly            assumes local backup and does not send to s3

EXAMPLE:
   ${0} -d databasename -b bucketname -l true
EOF
}

if [[ $# < 1 ]]; then
  usage
  exit 1
fi

TAR=$(command -v tar)
S3CMD=$(command -v s3cmd)
MONGO=$(command -v mongo)
MDUMP=$(command -v mongodump)
DATE=$(date +%Y%m%d)

if [[ -z ${TAR} ]] || [[ -z ${S3CMD} ]] || [[ -z ${MONGO} ]] || [[ -z ${MDUMP} ]]; then
  prereqs
  echo "One of the following tools is missing: tar, s3cmd, mongo, mongodump"
fi

${S3CMD} 2>&1 | grep "Consider using --configure" >/dev/null 2>&1
if [ $? -eq 0 ]; then
  echo "s3cmd needs to be configured for this script to be run"
  echo "Run s3cmd --configure"
  exit 1
fi


while [[ $# > 1 ]]
do
  key="${1}"
  shift
  case ${key} in
    -d|--database)
      MDB="${1}"
      shift
      ;;
    -b|--bucket)
      S3BUCKET="${1}"
      shift
      ;;
    -l|--localonly)
      LOCALONLY="${1}"
      shift
      ;;
  esac
done

if ( test -z "${LOCALONLY}" || [ "${LOCALONLY}" == "false" ] ) && [[ -z "${S3BUCKET}" ]]; then
  echo "If the backup is not local only then the S3 bucket needs to be defined"
  usage
  exit 1
fi

rm -rf ${BAKDIR}
mkdir -p ${BAKDIR}

pushd ${BAKDIR} > /dev/null 2>&1

BFILE=${BAKDIR}/${DATE}_${MDB}.tar.gz

echo "Locking mongo database"
${MONGO} admin --eval 'printjson(db.fsyncLock());' > /dev/null 2>&1
echo "Backing up mongo database"
${MDUMP} -d ${MDB} > /dev/null 2>&1
echo "Unlocking mongo database"
${MONGO} admin --eval 'printjson(db.fsyncUnlock());' > /dev/null 2>&1
${TAR} -czf ${BFILE} dump
if [ "${LOCALONLY}" == "false" ] || test -z ${LOCALONLY}; then
  ${S3CMD} put ${BFILE} s3://${S3BUCKET}/backup/${DATE}_${MDB}.tar.gz
  rm -rf ${BFILE}
else
  echo "Backup file is located in ${BFILE}"
fi

popd > /dev/null 2>&1