100-Days-Of-DevOps-Challenge-KodeKloud

Create a BASH Script

The production support team of xFusionCorp Industries is working on developing some bash scripts to automate different day to day tasks. One is to create a bash script for taking websites backup. They have a static website running on App Server 3 in Stratos Datacenter, and they need to create a bash script named beta_backup.sh which should accomplish the following tasks. (Also remember to place the script under /scripts directory on App Server 3).

• Create a zip archive named xfusioncorp_beta.zip of /var/www/html/beta directory.
• Save the archive in /backup/ on App Server 3. This is a temporary storage, as backups from this location will be clean on weekly basis. Therefore, we also need to save this backup archive on Nautilus Backup Server.
• Copy the created archive to Nautilus Backup Server server in /backup/ location.
• Please make sure script won’t ask for password while copying the archive file. Additionally, the respective server user (for example, tony in case of App Server 1) must be able to run it.

Steps

1. Login into app server 3 and generate ssh-key:
2. Copy ssh-pub key to backup server. Follow day 07 to complete these two steps

3. Write the following script in /scripts/beta_backup.sh:

    #!/bin/sh
   
    zip -r /backup/xfusioncorp_beta.zip /var/www/html/beta
    scp /backup/xfusioncorp_beta.zip clint@stbkp01:/backup/
   

4. Give the execute permission:

    chmod +x /scripts/beta_backup.sh
   

Good to Know?

Bash Scripting Best Practices

• Shebang: Always start with #!/bin/bash or #!/bin/sh
• Error Handling: Use set -e to exit on errors
• Variables: Quote variables: "$variable" to prevent word splitting
• Functions: Break complex logic into reusable functions

Backup Strategies

• Full Backup: Complete copy of all data
• Incremental: Only changed files since last backup
• Differential: Changed files since last full backup
• Compression: Use zip, tar.gz to save space

Archive Commands

• zip: zip -r archive.zip directory/ (cross-platform)
• tar: tar -czf archive.tar.gz directory/ (Unix standard)
• Exclusions: Skip temporary files and logs
• Verification: Test archives before relying on them

Remote Copy Methods

• scp: Secure copy over SSH
• rsync: Efficient synchronization tool
• sftp: Interactive file transfer
• Authentication: Use SSH keys for automation

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