Docker Restart Policies Explained | no, on-failure, always, unless-stopped
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This video explains Docker Restart Policies, a critical configuration for ensuring container reliability and application availability in production environments. By defining specific rules, these policies dictate how Docker should handle containers that crash, stop, or undergo system reboots (0:44-1:13).
Why use Restart Policies?
Automatic Recovery: Automatically restarts containers after crashes or errors (2:30-2:56).
High Availability: Ensures critical services like APIs and web servers stay accessible (3:02-3:14).
System Resilience: Allows services to resume automatically after a Docker daemon restart or host reboot (3:31-3:52).
Reduced Manual Work: Minimizes the need for human intervention to fix downtime (3:18-3:30).
Types of Docker Restart Policies
no (Default): The container will not restart automatically. This is suitable for testing or debugging but not recommended for production (4:46-5:53).
always: Docker will attempt to restart the container regardless of how it stopped (e.g., crashes, manual stops, or system reboots). Best for critical core services (6:23-7:37).
unless-stopped: Similar to 'always,' but it will not restart the container if it was explicitly stopped by an administrator. This provides a balance of automation and manual control, making it a preferred choice for production (7:38-9:12).
on-failure: Only restarts the container if it exits with a non-zero error code. You can also specify a retry limit to prevent infinite restart loops. Ideal for batch jobs and background tasks (9:13-11:11).
Best Practices
Avoid the default no policy in production (11:16-11:25).
Use unless-stopped for most production services to maintain control (11:27-11:42).
Use always for essential infrastructure that must never be down (11:42-11:55).
Use on-failure for tasks that might encounter temporary errors and require retries (11:56-12:09).
#docker #devops #cloudcomputing #dockercontainer #dockertutorial #devopsengineer #dockerforbeginners #cloudengineer #dockerrestartpolicy
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