Table of Contents

1. Challenge

   Create a Backup of /etc/nginx

   Create the script file:

   vim web-backups.sh
   

   We're first going to create an initial log file:

   #! /bin/bash
   
   touch /home/cloud_user/web-bu-log
   

   Then pull down our /etc/nginx directory from the provided server and compress it:

   echo "Creating nginx backups" >> /home/cloud_user/web-bu-log
   
   lxc file pull web01/etc/nginx /tmp/ -r --create-dirs
   tar -czvf /tmp/nginx.tar.gz /tmp/nginx/
   

2. Challenge

   Create a Container for Backups Testing

   We now want to create a container that is using the same distribution as the web01 containers, Alpine 3.11:

   echo "Lauching test container" >> /home/cloud_user/web-bu-log
   
   lxc launch images:alpine/3.11 web-bu-test
   lxc exec web-bu-test -- apk update
   

3. Challenge

   Extract the Backups on the Container

   From here, we want to add our nginx.tar.gz file, and extract it:

   lxc file push /tmp/nginx.tar.gz web-bu-test/tmp/nginx.tar.gz
   lxc exec web-bu-test -- tar -xf /tmp/nginx.tar.gz -C /tmp/
   

4. Challenge

   Compare the Backup to the Original

   Let's now pull down the same file from both the original and the backup server, and compare them to see if they match. If they do match, we'll consider it a success and clean our our environment:

   lxc file pull web01/etc/nginx/conf.d/default.conf /tmp/default.conf-original
   lxc file pull web-bu-test/tmp/tmp/nginx/conf.d/default.conf /tmp/default.conf-backup
   
   echo "Testing backups to original" >> /home/cloud_user/web-bu-log
   
   if diff /tmp/default.conf-original /tmp/default.conf-backup > /dev/null;
   then
    echo "Success!" >> /home/cloud_user/web-bu-log
    lxc stop web-bu-test
    lxc delete web-bu-test
    rm -rf /tmp/nginx
    rm /tmp/default.conf-*
   

   If it does not match, we'll make a copy of the container and leave it up for review:

   else
   
    echo "!!BACKUP TEST FAILED!!" >> /home/cloud_user/web-bu-log
    echo "!!SEE web-bu-fail_* CONTAINER!!" >> /home/cloud_user/web-bu-log
    lxc snapshot web-bu-test fail
    lxc copy web-bu-test/fail web-bu-fail_$(date +%Y%m%d)
    lxc stop web-bu-test
    lxc delete web-bu-test
    rm -rf /tmp/nginx
    rm /tmp/default.conf-*
   fi
   

5. Challenge

   Test Script

   Save and exit the completed file, which should look like:

   #! /bin/bash
   
   touch /home/cloud_user/web-bu-log
   
   echo "Creating nginx backups" >> /home/cloud_user/web-bu-log
   
   lxc file pull web01/etc/nginx /tmp/ -r --create-dirs
   tar -czvf /tmp/nginx.tar.gz /tmp/nginx/
   
   echo "Lauching test container" >> /home/cloud_user/web-bu-log
   
   lxc launch images:alpine/3.11 web-bu-test
   lxc exec web-bu-test -- apk update
   lxc file push /tmp/nginx.tar.gz web-bu-test/tmp/nginx.tar.gz
   lxc exec web-bu-test -- tar -xf /tmp/nginx.tar.gz -C /tmp/
   lxc file pull web01/etc/nginx/conf.d/default.conf /tmp/default.conf-original
   lxc file pull web-bu-test/tmp/tmp/nginx/conf.d/default.conf /tmp/default.conf-backup
   
   echo "Testing backups to original" >> /home/cloud_user/web-bu-log
   
   if diff /tmp/default.conf-original /tmp/default.conf-backup > /dev/null;
   then
    echo "Success!" >> /home/cloud_user/web-bu-log
    lxc stop web-bu-test
    lxc delete web-bu-test
    rm -rf /tmp/nginx
    rm /tmp/nginx.tar.gz
    rm /tmp/default.conf-*
   else
   
    echo "!!BACKUP TEST FAILED!!" >> /home/cloud_user/web-bu-log
    echo "!!SEE web-bu-fail_* CONTAINER!!" >> /home/cloud_user/web-bu-log
    lxc snapshot web-bu-test fail
    lxc copy web-bu-test/fail web-bu-fail_$(date +%Y%m%d)
    lxc stop web-bu-test
    lxc delete web-bu-test
    rm -rf /tmp/nginx
    rm /tmp/nginx.tar.gz
    rm /tmp/default.conf-*
   fi
   

   Now test it:

   chmod +x web-backups.sh
   ./web-backups.sh
   

   To confirm that it was successful, review the log:

   cat web-bu-log
   

6. Challenge

   Add to Cron

   Add the script to your crontab so it runs at midnight, daily:

   crontab -e
   

   0 0 * * * /home/cloud_user/backups.sh