docker never exits container

To keep the Docker container running and not exiting, there are many ways to do it. In this article, we'll cover some commonly used methods and their pros and cons.

Method 1: Use the --restart option

Docker provides an option --restart, which can automatically restart the container when the container exits abnormally. There are three optional values, namely no, on-failure and always, which respectively correspond to no restart, restart on abnormal exit and always restart. Specific example:

docker run --restart=always IMAGE_NAME

The advantage of using the --restart option is that it is simple and easy to use. You only need to add an option to the command line. But if an error occurs in the container, it will continue to restart until the container is manually stopped. This can lead to code instability and data loss.

Method 2: Use Docker Compose

Docker Compose is a tool that can define and run multiple Docker containers. It can describe the relationship between containers and startup parameters through a yml file. Add the following configuration in the docker-compose.yml file:

version: '3'

services:
  app:
    build: .
    restart: always

Then you can use the docker-compose command to start the container:

docker-compose up -d

# The ##restart: always option tells Docker to automatically restart the container when the container exits abnormally. The advantage of this method is that it can manage multiple containers, which is convenient and fast, but there is still the problem of containers restarting all the time.

supervisor daemon to start a Node.js service:

Install supervisor:

npm install -g supervisor

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Create the
2. supervisord.conf file and add the following content:

[supervisord]
nodaemon=true

[program:app]
command=supervisor app.js
directory=/app
autostart=true
autorestart=true
user=root

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Add the following configuration in the Dockerfile:

RUN apt-get update && apt-get install -y supervisor

COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf

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docker build -t IMAGE_NAME .
docker run -d IMAGE_NAME

systemd to monitor Docker containers:

Create a systemd unit file, such as
1. mydocker.service, the file content is as follows :

[Unit]
Description=My Docker Container

[Service]
ExecStart=/usr/bin/docker start -a myapp
Restart=always
RestartSec=10s
ExecStop=/usr/bin/docker stop -t 2 myapp

[Install]
WantedBy=default.target

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myapp. When a problem occurs with the container, systemd will automatically restart the container. Use the systemctl command to enable this service:

sudo systemctl daemon-reload
sudo systemctl enable mydocker.service
sudo systemctl start mydocker.service

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