How to check the version number of docker image

If you want to check the version number TAG of the image, you need to check it on docker hub

The address is as follows: https://hub.docker.com

After entering, search for

in the search box in the upper left corner of the page. Taking nginx as an example:

# docker pull nginx:1.15.5

1.15.5: Pulling from library/nginx
f17d81b4b692: Pull complete 
d5c237920c39: Pull complete 
a381f92f36de: Pull complete 
Digest: sha256:b73f527d86e3461fd652f62cf47e7b375196063bbbd503e853af5be16597cb2e
Status: Downloaded newer image for nginx:1.15.5

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