Shulou(Shulou.com)06/03 Report--

This article introduces the knowledge of "what are the ways to update the configuration of Docker but do not need to restart the service". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Problem description

When we modify the configuration, we need to restart the service for the configuration to take effect.

However, restart the dockerd service and the container will be stopped. We want the container to continue to run, not stop.

This note will record how to reload the configuration file without restarting the dockerd service.

Solution 1. Through HUP signal

In dockerd, with the HUP signal, some options can be reloaded without restarting the container.

For supported options, refer to the dockerd | Docker Documentation / CONFIGURATION RELOAD BEHAVIOR documentation.

For example, you can set up an image acceleration site and perform reload:

# vim / etc/docker/daemon.json {... "registry-mirrors": ["https://xxxxxxx.mirror.aliyuncs.com"],...} # systemctl reload docker scenario II, through the live-restore feature

To keep the container running when the daemon dockerd is not available, you can use the following configuration:

# vim / etc/docker/daemon.json {... Live-restore: true,...} # systemctl reload docker # SIGHUP

When the live-restore feature is enabled, the container does not exit even if the Docker service is restarted.

However, there are limitations to this method. Refer to the Keep containers alive during daemon downtime | Docker Documentation documentation.

This is the end of the content of "what are the ways for Docker to update the configuration without restarting the service". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.