Run container in production
Start Container Automatically
container has restart policy
docker run --restart 'policy' redis
| flag | Description |
|---|---|
| no | no auto restart |
| no-failure | only on non-zero exit code |
| always | restart it if it is stopped |
| unless-stopped | similar to always, but not restart when daemon restarts |
difference --live-restore flag of dockerd
the flag allows keeping container running during a docker upgrade, though networking and user input is interrupted
The live restore option only works to restore containers if the daemon options, such as bridge IP addresses and graph driver, did not change. If any of these daemon-level configuration options have changed, the live restore may not work and you may need to manually stop the containers.
Note
- A restart policy only takes effect after it starts successfully meaning it is up more than 10 seconds
- if it is manually stopped, its restart policy is ignored until daemon restart or container manually restarted.
- restart policy only applies to containers.
Run multiple services in a container
- recommend a service per container
- the container main process is responsible for managing all processes.
- can user --init option to insert a tiny init-process to the container as the main process
Container stats
docker stats
limit a container's resources
By default, a container can use as much of resource as host allows.