Steps for docker to pull an image to view the version
To see the good TAG version of the image, you need to view it in docker hub.
The address is: https://hub.docker.com
After entering, search in the search box in the upper left corner of the page
Take nginx as an example:
The search is completed as follows: click to enter the details
Click on the tab
Just choose the label you want to pull.
For example, pull the nginx image labeled 1.15.5
# docker pull nginx:1.15.51.15.5: Pulling from library/nginxf17d81b4b692: Pull complete d5c237920c39: Pull complete a381f92f36de: Pull complete Digest: sha256:b73f527d86e3461fd652f62cf47e7b375196063bbbd503e853af5be16597cb2eStatus: Downloaded newer image for nginx:1.15.5
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