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backup.mongo.plugin
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backup.mongo.plugin
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#!/bin/bash
# =================================================================================================================
# Mongo Backup and Restore Functions:
# - Dynamically loaded as a plug-in
# -----------------------------------------------------------------------------------------------------------------
export serverDataDirectory="/data/db"
function onBackupDatabase(){
(
local OPTIND
local unset flags
while getopts : FLAG; do
case $FLAG in
? ) flags+="-${OPTARG} ";;
esac
done
shift $((OPTIND-1))
_databaseSpec=${1}
_backupFile=${2}
_hostname=$(getHostname ${_databaseSpec})
_database=$(getDatabaseName ${_databaseSpec})
_port=$(getPort ${_databaseSpec})
_portArg=${_port:+"--port=${_port}"}
_username=$(getUsername ${_databaseSpec})
_password=$(getPassword ${_databaseSpec})
echoGreen "Backing up '${_hostname}${_port:+:${_port}}${_database:+/${_database}}' to '${_backupFile}' ..."
_authDbArg=${MONGODB_AUTHENTICATION_DATABASE:+"--authenticationDatabase ${MONGODB_AUTHENTICATION_DATABASE}"}
mongodump -h "${_hostname}" -d "${_database}" ${_authDbArg} ${_portArg} -u "${_username}" -p "${_password}" --quiet --gzip --archive=${_backupFile}
return ${?}
)
}
function onRestoreDatabase(){
(
local OPTIND
local unset flags
while getopts : FLAG; do
case $FLAG in
? ) flags+="-${OPTARG} ";;
esac
done
shift $((OPTIND-1))
_databaseSpec=${1}
_fileName=${2}
_adminPassword=${3}
_hostname=$(getHostname ${flags} ${_databaseSpec})
_database=$(getDatabaseName ${_databaseSpec})
_port=$(getPort ${flags} ${_databaseSpec})
_portArg=${_port:+"--port=${_port}"}
_username=$(getUsername ${_databaseSpec})
_password=$(getPassword ${_databaseSpec})
echo -e "Restoring '${_fileName}' to '${_hostname}${_port:+:${_port}}${_database:+/${_database}}' ...\n" >&2
# ToDo:
# - Add support for restoring to a different database.
# The following implementation only supports restoring to a database of the same name,
# unlike the postgres implementation that allows the database to be restored to a database of a different
# name for testing.
# Ref: https://stackoverflow.com/questions/36321899/mongorestore-to-a-different-database
_authDbArg=${MONGODB_AUTHENTICATION_DATABASE:+"--authenticationDatabase ${MONGODB_AUTHENTICATION_DATABASE}"}
mongorestore --drop -h ${_hostname} -d "${_database}" ${_authDbArg} ${_portArg} -u "${_username}" -p "${_password}" --gzip --archive=${_fileName} --nsInclude="*"
return ${?}
)
}
function onDatabaseInit() {
(
local OPTIND
local unset flags
while getopts : FLAG; do
case $FLAG in
? ) flags+="-${OPTARG} ";;
esac
done
shift $((OPTIND-1))
# Retrieve database details
_databaseSpec=${1}
_database=$(getDatabaseName "${_databaseSpec}")
_username=$(getUsername "${_databaseSpec}")
_password=$(getPassword "${_databaseSpec}")
# Check if the database already exists
result=$(mongosh --eval "db.getMongo().getDBNames().indexOf('$_database')")
if [ ! -z "$result" ] && [ "$result" -ge 0 ]; then
echoYellow "Database '$_database' already exists, skipping initialization."
return 0
fi
# Initialize the database by creating the user with the roles
mongosh "$_database" --quiet --eval "
db.createUser({
user: '$_username',
pwd: '$_password',
roles: [
{ role: 'dbOwner', db: '$_database' },
{ role: 'readWrite', db: '$_database' },
{ role: 'clusterAdmin', db: 'admin' }
]
});
" > /dev/null 2>&1 &
# Check the exit status of the createUser command
if [ $? -eq 0 ]; then
echoGreen "Database '$_database' initialized successfully."
return 0
else
echoRed "Failed to initialize database '$_database'."
return 1
fi
)
}
function onStartServer(){
(
local OPTIND
local unset flags
while getopts : FLAG; do
case $FLAG in
? ) flags+="-${OPTARG} ";;
esac
done
shift $((OPTIND-1))
_databaseSpec=${1}
_hostname=$(getHostname ${flags} ${_databaseSpec})
# Start a local MongoDb instance
exec mongod --bind_ip $_hostname --quiet >/dev/null 2>&1 &
# Wait for mongodb to be ready
while ! mongosh --host $_hostname --eval "db.adminCommand('ping')" > /dev/null 2>&1; do
sleep 1
done
# Initialize database if necessary
onDatabaseInit "${_databaseSpec}"
)
}
function onStopServer(){
(
local OPTIND
local unset flags
while getopts : FLAG; do
case $FLAG in
? ) flags+="-${OPTARG} ";;
esac
done
shift $((OPTIND-1))
_databaseSpec=${1}
_hostname=$(getHostname ${flags} ${_databaseSpec})
local startTime=$(date +%s%N)
local timeout=30
mongosh --host $_hostname --eval "db.getSiblingDB('admin').shutdownServer()" &
mongosh_pid=$!
# Wait for mongosh to finish or timeout
while kill -0 $mongosh_pid 2>/dev/null; do
if [ $(($(date +%s) - startTime)) -ge $timeout ]; then
kill $mongosh_pid
break
fi
sleep 1
done
# Ensure mongod is stopped
pkill -f "mongod --bind_ip $_hostname"
)
}
function onCleanup(){
(
if ! dirIsEmpty ${serverDataDirectory}; then
# Delete the database files and configuration
echo -e "Cleaning up ...\n" >&2
rm -rf ${serverDataDirectory}/*
else
echo -e "Already clean ...\n" >&2
fi
)
}
function onPingDbServer(){
(
local OPTIND
local unset flags
while getopts : FLAG; do
case $FLAG in
? ) flags+="-${OPTARG} ";;
esac
done
shift $((OPTIND-1))
_databaseSpec=${1}
_hostname=$(getHostname ${flags} ${_databaseSpec})
mongosh --host $_hostname --eval "db.adminCommand('ping')" > /dev/null 2>&1
local mongoshExitCode=$?
if (( ${mongoshExitCode} != 0 )); then
return 1
else
return 0
fi
)
}
function onVerifyBackup(){
(
local OPTIND
local unset flags
while getopts : FLAG; do
case $FLAG in
? ) flags+="-${OPTARG} ";;
esac
done
shift $((OPTIND-1))
_databaseSpec=${1}
_hostname=$(getHostname -l ${_databaseSpec})
_database=$(getDatabaseName ${_databaseSpec})
_port=$(getPort -l ${_databaseSpec})
_portArg=${_port:+"--port ${_port}"}
_username=$(getUsername ${_databaseSpec})
_password=$(getPassword ${_databaseSpec})
_dbAddressArg=${_hostname}${_port:+:${_port}}${_database:+/${_database}}
_authDbArg=${MONGODB_AUTHENTICATION_DATABASE:+"--authenticationDatabase ${MONGODB_AUTHENTICATION_DATABASE}"}
collections=$(mongosh ${_dbAddressArg} ${_authDbArg} -u "${_username}" -p "${_password}" --quiet --eval 'var dbs = [];dbs = db.getCollectionNames();for (i in dbs){ print(db.dbs[i]);}';)
rtnCd=${?}
# Get the size of the restored database
if (( ${rtnCd} == 0 )); then
size=$(getDbSize -l "${_databaseSpec}")
rtnCd=${?}
fi
if (( ${rtnCd} == 0 )); then
numResults=$(echo "${collections}"| wc -l)
if [[ ! -z "${collections}" ]] && (( numResults >= 1 )); then
# All good
verificationLog="\nThe restored database contained ${numResults} collections, and is ${size} in size."
else
# Not so good
verificationLog="\nNo collections were found in the restored database ${_database}."
rtnCd="3"
fi
fi
echo ${verificationLog}
return ${rtnCd}
)
}
function onGetDbSize(){
(
local OPTIND
local unset flags
while getopts : FLAG; do
case $FLAG in
? ) flags+="-${OPTARG} ";;
esac
done
shift $((OPTIND-1))
_databaseSpec=${1}
_hostname=$(getHostname ${flags} ${_databaseSpec})
_database=$(getDatabaseName ${_databaseSpec})
_port=$(getPort ${flags} ${_databaseSpec})
_portArg=${_port:+"--port ${_port}"}
_username=$(getUsername ${_databaseSpec})
_password=$(getPassword ${_databaseSpec})
_dbAddressArg=${_hostname}${_port:+:${_port}}${_database:+/${_database}}
_authDbArg=${MONGODB_AUTHENTICATION_DATABASE:+"--authenticationDatabase ${MONGODB_AUTHENTICATION_DATABASE}"}
size=$(mongosh ${_dbAddressArg} ${_authDbArg} -u "${_username}" -p "${_password}" --quiet --eval 'printjson(db.stats().fsTotalSize)')
rtnCd=${?}
echo ${size}
return ${rtnCd}
)
}
# =================================================================================================================