실습

docker run --rm -d nginx

mount | grep overlay
overlay on /var/lib/docker/overlay2/673265ddb7392fad18525d2a681cd5c4510128a27f115f7930c01e8a57a34359/merged type overlay
(rw,relatime,lowerdir=/var/lib/docker/overlay2/l/NPO7XRLTSLX7XVKBLI2BQOOED4:/var/lib/docker/overlay2/l/KLKSKMVQVCK2KKXXTMCLPNSP2A:/var/lib/docker/overlay2/l/JRZMIXFA5PBFTXOWGC6KHUQ7LX:/var/lib/docker/overlay2/l/GGL25YEPLNDXK6W65LQS7IR2NO:/var/lib/docker/overlay2/l/W7W7YXTYHJEDMATDWLYBFB3WPZ:/var/lib/docker/overlay2/l/AFUOAN6PPHFG7FHKLZAEHJCJEP:/var/lib/docker/overlay2/l/YV6WP4RC22RSSMMOIU2JMJ3YMA:/var/lib/docker/overlay2/l/6WU2G3C5SJBCEEHZTYKGBU2ZHW,
upperdir=/var/lib/docker/overlay2/673265ddb7392fad18525d2a681cd5c4510128a27f115f7930c01e8a57a34359/diff,
workdir=/var/lib/docker/overlay2/673265ddb7392fad18525d2a681cd5c4510128a27f115f7930c01e8a57a34359/work)

overlay

lowerdir

upperdir

workdi