檢視 docker image layers

在 console 中用 docker history 即可檢視 docker image layers：

docker history php:8.1
IMAGE          CREATED      CREATED BY                                      SIZE      COMMENT
7b5ec6cb3ed5   5 days ago   /bin/sh -c #(nop)  CMD ["php" "-a"]             0B        
<missing>      5 days ago   /bin/sh -c #(nop)  ENTRYPOINT ["docker-php-e…   0B        
<missing>      5 days ago   /bin/sh -c docker-php-ext-enable sodium         17B       
<missing>      5 days ago   /bin/sh -c #(nop) COPY multi:6edd033b037aa2d…   7.2kB     
<missing>      5 days ago   /bin/sh -c set -eux;   savedAptMark="$(apt-m…   121MB     
<missing>      5 days ago   /bin/sh -c #(nop) COPY file:ce57c04b70896f77…   587B      
.....

發現一個工具 dive 可以是更詳細的資料：