Overview
When upgrading an Engine Yard environment to a new server type, such as m410x, the environment may become stuck in the "apply" state. This can occur due to configuration issues, failures in Chef scripts, or essential services not restarting properly. A common issue is the PostgreSQL server failing to start due to an invalid "backup_label" file in its data directory. This article provides steps to resolve such issues and ensure the environment can continue applying changes.
Information
To resolve an Engine Yard environment stuck in the "apply" state after a server upgrade, follow these steps:
-
Review Logs and Diagnostics:
- SSH into the instance.
- Check running processes using
ps auxandmonit summary. - Review Chef logs in
/var/log/chef.*, application logs in/var/log/engineyard/apps/[application_name], and deployment logs in/home/deploy/for errors.
-
Identify PostgreSQL Issues:
- If the PostgreSQL server is not running, check for errors such as
FATAL: invalid data in file "backup_label". - Navigate to the PostgreSQL data directory and rename the "backup_label" file to resolve the issue.
- If the PostgreSQL server is not running, check for errors such as
-
Retry Configuration Update:
- Click 'Apply' again for the individual instance in the Engine Yard dashboard.
-
Reboot the Instance:
- If the issue persists, reboot the instance via the dashboard to reset any stuck processes.
-
Address Custom Chef Recipe Errors:
- Review custom Chef recipes for errors, particularly attributes like
node[:dr_replication]and others. - Correct any issues and click the Apply button to restart the Chef run.
- Review custom Chef recipes for errors, particularly attributes like
-
Provision a New Instance (if necessary):
- As a last resort, provision a new instance to replace the stuck one, ensuring all critical data is backed up first.
-
Replicate in Staging:
- If feasible, replicate the issue in a cloned staging environment to troubleshoot without impacting production.
Frequently Asked Questions
- What causes the "apply" state to get stuck after a server upgrade?
- The "apply" state can get stuck due to configuration or compatibility issues, failures in Chef scripts, or essential services not restarting properly. A common issue is an invalid "backup_label" file in the PostgreSQL data directory.
- How can I resolve a PostgreSQL server not running due to an invalid "backup_label" file?
- Navigate to the PostgreSQL data directory and rename the "backup_label" file. This should allow the PostgreSQL server to start and the apply process to continue.
- What should I do if there are errors in custom Chef recipes?
- Review the custom Chef recipes for errors, particularly focusing on attributes like
node[:dr_replication]. Correct any issues and click the Apply button to restart the Chef run.
Priyanka Bhotika
Comments