What is run in docker
In docker, run is a command used to create a new container and run a command; when executing "docker run", Docker will start a process and allocate its exclusive files to the process. System, exclusive network resources and process group with this process as the root process, the syntax is "docker run [OPTIONS] IMAGE [COMMAND] [ARG...]".
The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.
What is run in docker
docker run: Create a new container and run a command
Docker will encapsulate related processes into mutually isolated containers when executed ( container). When docker run is executed, Docker will start a process and allocate to this process its exclusive file system, exclusive network resources, and process group with this process as the root process. The Image loaded when Docker starts the container may have a default startup process defined, which requires the exposer's network port and other resources defined in the Dockerfile. But you can redefine this image by default using docker run. This is why the run command has more parameters than other docker command parameters.
Syntax
docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
OPTIONS Description:
- ##-a stdin: Specifies the standard input and output content type, optional STDIN/ STDOUT/STDERR three items;
- -d: Run the container in the background and return the container ID;
- -i: Run the container in interactive mode , usually used together with -t;
- -P: Random port mapping, the container’s internal port is randomly mapped to the host’s port
- -p : Specify port mapping, the format is: host (host) port: container port
- -t: Reassign a pseudo input terminal to the container, usually used together with -i;
- --name="nginx-lb": Specify a name for the container;
- --dns 8.8.8.8: Specify the DNS server used by the container , the default is consistent with the host;
- --dns-search example.com: Specifies the container DNS search domain name, the default is consistent with the host;
- -h "mars": Specify the hostname of the container;
- -e username="ritchie": Set the environment variable;
- --env -file=[]: Read environment variables from the specified file;
- --cpuset="0-2" or --cpuset="0,1,2": Bind The container runs on the specified CPU;
- -m: Sets the maximum memory used by the container;
- --net="bridge": Specifies the container Network connection type, supports bridge/host/none/container: four types;
- --link=[]: Add a link to another container;
- --expose=[]: Open a port or a group of ports;
- --volume, -v: Bind a volume
docker run --name mynginx -d nginx:latest
docker run -P -d nginx:latest
docker run -p 80:80 -v /data:/data -d nginx:latest
$ docker run -p 127.0.0.1:80:8080/tcp ubuntu bash
docker video tutorial"
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