What are the statuses of docker containers?

There are 7 types of container status: 1. "created", which means it has been created; 2. "restarting", which means it is restarting; 3. "running", which means it is running; 4. "removing", which means it is migrating. Medium; 5. "paused" means paused state; 6. "exited" means stopped, etc.

The operating environment of this tutorial: linux5.9.8 system, docker-1.13.1 version, Dell G3 computer.

Seven states of Docker containers

View the status of all containers under docker:

docker ps -a

Returned content , one field is STATUS.

STATUS: Container status, there are 7 types:

created（已创建）
restarting（重启中）
running（运行中）
removing（迁移中）
paused（暂停）
exited（停止）
dead（死亡）

Among these statuses, the most important and common ones are other than restarting (restarting) and removing (migrating) Five states. Basically, most container life cycle diagrams on the Internet only contain five states: created, running, paused, exited, and dead.

The most common one, when a container becomes exited for some reason, you can use start to restart, for example: when running When, it prompts that the container is not running, and the container is not displayed when using docker ps

Later, I want to create a new container and find that It prompts that the containers created before are actually still there. Use docker ps -a to view all containers and see: They are actually in the exited state

Subsequently, I used docker start OCR to restart the container and checked that everything inside was still there.

Similar to exited (stopped)

UP is still running (running)

In addition, if you want to know these statuses, the easiest way is, docker --help, and in the returned information, you can see:

# 用来创建容器
create      Create a new container
# 在一个运行状态的容器中执行命令
exec        Run a command in a running container
# 杀死运行中的容器
kill        Kill one or more running containers
# 让容器暂停
pause       Pause all processes within one or more containers
# 恢复容器
unpause     Unpause all processes within one or more containers
# 重启容器
restart     Restart one or more containers
# 新建并初始化一个容器（注意 是一个新的容器）
 run         Run a command in a new container
# 启动一个被停止的容器
 start       Start one or more stopped containers
# 暂停运行中的容器
stop        Stop one or more running containers

Extended knowledge: container life cycle

You can Google container lifecycle to see related content, mainly search for pictures, you can see that there are many pictures, just like the life of the process The cycle is the same.

Mainly reflects the changing relationship between the five states of created (created), running (running), paused (paused), exited (stopped), and dead (dead).

The started in the figure below is approximately equal to running.

The stopped in the picture below is approximately equal to exited

## Source: Docker Container Lifecycle Management: Create, Run, Pause, Stop And Delete

From: docker basic commands

From: docker command map

From ：Docker Series 03—Docker Basics Introduction
In fact, the above picture should originally come from:

From: Docker Internals-A Deep pe Into Docker For Engineers Interested In The Gritty Details.

Reference:

Docker Container Lifecycle Management: Create, Run, Pause, Stop And Delete
• Introduction to the Docker Life Cycle Chinese translation of this article:
• Zhihu article: Introduction to Docker life cycle
• Zhihu article: Docker life cycle

Recommended study: "

docker video tutorial"

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