Чтобы безопасно использовать виртуальные сервера (вдс/впс), нужно всегда чистить логи, потому что в логах сохраняются все ваши действия и ваши айпишники, с которых вы подключаетесь по ssh или любому другому протоколу, вручную это делать долго, поэтому мы сделали скрипт 
Создаём файлик log_cleaner.sh
Запускаем:

Создаём файлик log_cleaner.sh
Bash:
#!/bin/bash
function log() {
if [[ "$LOG" == "1" ]]; then
if (($# > 0 )); then
echo -e "[email protected]"
fi
fi
}
function echoerr() {
echo "[email protected]" 1>&2;
}
function remove_files_from_directory() {
if (($# < 1)); then
echo "Error, need directory"
return
fi
Files=`ls $1`
Dir=$1
for file in $Files; do
if [[ -d "$1/$file" ]]; then
log "$1/$file is a directory, clearing it"
remove_files_from_directory "$1/$file"
elif [[ -h "$1/$file" ]]; then
log "$1/$file is symlink, don't touch this"
else
log "$1/$file is file, remove it"
rm "$1/$file"
fi
done
}
if [[ -z "$CLEAR_DIR" ]]; then
CLEAR_DIR="/var/log"
fi
if [[ -z "$DELAY_TIME" ]]; then
DELAY_TIME="0"
fi
log ""
log '.%%..%%...%%%%....%%%%...%%..%%..%%%%%%..%%%%%...%%..%%..%%%%%%..%%......%%......%%%%%%.
.%%..%%..%%..%%..%%..%%..%%.%%...%%......%%..%%..%%..%%....%%....%%......%%......%%.....
.%%%%%%..%%%%%%..%%......%%%%....%%%%....%%%%%...%%..%%....%%....%%......%%......%%%%...
.%%..%%..%%..%%..%%..%%..%%.%%...%%......%%..%%...%%%%.....%%....%%......%%......%%.....
.%%..%%..%%..%%...%%%%...%%..%%..%%%%%%..%%..%%....%%....%%%%%%..%%%%%%..%%%%%%..%%%%%%.
........................................................................................'
log ""
log "Set HOME directory to $HOME"
log "Logging set to 1"
log "CLEAR_DIR = $CLEAR_DIR"
log "DELAY_TIME = $DELAY_TIME"
log ""
rm /root/.bash_history
ln -s /dev/null /root/.bash_history
log "Link bash history to /dev/null"
service rsyslog stop
log "Rsyslog was stopped"
log "Delete log: "
while true; do
remove_files_from_directory "$CLEAR_DIR"
if [[ "$DELAY_TIME" == "0" ]]; then
break
fi
log "Sleep for $DELAY_TIME"
sleep $DELAY_TIME
done
chmod +x log_cleaner.sh
echo "*/5 * * * * <path_to_script>" >> /var/spool/cron/crontabs/root