如何通过Expect脚本自动化Ambari-Server升级的交互式确认

If you're looking to skip the manual confirmation prompt during ambari-server upgrade, an Expect script is perfect for handling this interactive step automatically. Here's a straightforward implementation:

Prerequisite: Install Expect #

First, make sure the Expect tool is installed on your system. Depending on your OS:

• For RHEL/CentOS/Rocky Linux:

  sudo yum install expect -y
  

• For Ubuntu/Debian:

  sudo apt-get update && sudo apt-get install expect -y
  

The Expect Script #

Create a file (e.g., auto-ambari-upgrade.exp) with the following content:

#!/usr/bin/expect

# Set timeout to a reasonable value (adjust if your upgrade takes longer)
set timeout 300

# Spawn the ambari-server upgrade command
spawn sudo ambari-server upgrade

# Wait for the confirmation prompt and send "y" to confirm
expect "have made a backup of the Ambari Server database [y/n] (y)?"
send "y\r"

# Wait for the upgrade process to complete
expect eof

How to Use the Script #

1. Make the script executable:

   chmod +x auto-ambari-upgrade.exp
   

2. Run it:

   ./auto-ambari-upgrade.exp
   

Important Notes #

• Always back up your Ambari database first: Even though the script auto-responds "yes", you should ensure you have a valid backup before proceeding with the upgrade—this prompt exists for a reason!
• Adjust the timeout: If your upgrade process takes longer than 5 minutes (300 seconds), increase the set timeout value to match.
• Verify the prompt string: If the exact wording of the confirmation prompt differs in your Ambari version, update the text inside the expect command to match exactly (case-sensitive).

内容的提问来源于stack exchange，提问作者yael