拷贝容器中文件

例子准备

docker run -d nginx

方法一

docekr cp /etc/nginx/nginx.conf ./

方法二

docker run -v $PWD:/tmp 
docker exec -it nginx /bin/bash
cp /etc/nginx/nginx.conf /tmp

方法三

获取mergedir
docker inspect d3238c1fd3520500c9e02eac7ef3b701235cd5d0a534bc57b2c756a34406f5c5|jq '.[0].GraphDriver.Data.MergedDir'

cp 得到的mergedir/etcd/nginx/nginx.conf ./

方法四

获取pid
docker container inspect mycontainer | jq '.[0].State.Pid'
sudo cp /proc/获取的pid/root/etcd/nginx/nginx.conf ./

方法五

获取pid
docker container inspect mycontainer | jq '.[0].State.Pid'
cat /proc/获取的pid/mountinfo
找到uppedr=xxx/diff
mergeddir是upperdir改为xxx/merged
然后cp 得到的mergedir/etcd/nginx/nginx.conf ./