Docker的这个命令作用是什么？

Question

$eval "$(docker-machine env --swarm swarm-master)"

上面这个命令的中文解释是：“把当前环境变量配置到shell中”。
可是没听懂，麻烦解释一下什么意思？起什么作用？

Answer 1

The execution results of docker-machine env are as follows:

$ docker-machine env default
export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.99.100:2376"
export DOCKER_CERT_PATH="Y:\Users\YSTYLE\.docker\machine\machines\default"
export DOCKER_MACHINE_NAME="default"
# Run this command to configure your shell:
# eval $("D:\Programming\Docker Toolbox\docker-machine.exe" env default)

Parameter --swarm swarm-master indicates that this docker is a swarm cluster

The function of

eval is to parse the text into a script and then execute it. Here, the results similar to the above are executed, just setting a few environment variables

The local docker cli actually sends instructions to damon through remote tcp.
The specific machine being operated is specified by the environment variable DOCKER_HOST, which is 127.0.0.1:2375 when empty

Answer 2

baidu docker

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