Build a Home Terabyte Backup System Using Linux
To add an additional level of security, you may consider adding a second server to your overall backup plans consisting of a server that exists off-site, away from the home or office location where your primary backup server is located. This allows you to mirror your backup server to an off-site location once a week. That way, if you have a fire or some other catastrophe at your primary location, your data still will be available. Figure 2 shows a sample configuration for this setup.
Listing 2 is a basic script that mirrors the server bar with an off-site mirror baroffsite using rsync. Always set up backups to run automatically and on a regular schedule. Always keep logs of your backups, and always check the backup logs.
Listing 2. rsync Mirroring bar to baroffsite
#!/bin/sh # Mirror /data1 on bar to /data1/bar on baroffsite. #Backup directory on bar BACKUP=/data1 #Backup directory on baroffsite BACKUP_OFF=/data1/bar # Give the day of week as name of backup BACKUPNAME=`date +%A` # Offsite server BSERVER=baroffsite # Backup account on backup server BAC_ACC=backup date > /var/log/backup.$BACKUPNAME.log /usr/bin/rsync -avz --delete -e ssh $BACKUP $BAC_ACC@$BSERVER:$BACKUPOFF >> /var/log/backup.$BACKUPNAME.log # Email the log to administrator cat /var/log/backup.$BACKUPNAME.log | mail -s 'Mirror Check' firstname.lastname@example.org
In order to monitor your backup process and make sure your backups are running as scheduled (and that your backup server hasn't run out of disk space), it's important to put some automated monitoring and reporting into place. Listing 3 is a simple script that can be set up to run periodically via cron and send you a summary of the backups that have occurred and how much disk space is remaining on each of your partitions.
Listing 3. Simple Timestamp and Disk Space Lister
#!/bin/sh # Check space on partitions # List timestamps in chronological order BACKUPS=/data1 #Identify directories to check # Give the day of week as name of backup BACKUPNAME=`date +%A` #Timestamp date > /var/log/backup.$BACKUPNAME.log # Disk space on partitions df -k > /var/log/backup.$BACKUPNAME.log echo ' ' >> /var/log/backup.$BACKUPNAME.log #List timestamps on backup server # ls -lRt is much more verbose ls -lt $BACKUPS/* >> /var/log/backup.$BACKUPNAME.log # Email the log to administrator cat /var/log/backup.$BACKUPNAME.log | mail -s 'Backup Check' email@example.com
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Duncan Napier works as computer and instrumentation consultant in the Vancouver area of British Columbia.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide