docker 的匯出與匯入、練習流程

複習 docker 複習及加上使用dockerfile 一鍵跑到完

匯出訂自的 image

# docker save -o <TAR_FILE> <REPOSITORY>
# docker save -o <TAR_FILE> <REPOSITORY>:<TAG>
docker save -o mycentos.tar mycentos
docker save mycentos > mycentos.tar

匯出官方線上的 image

docker save -o centos.tar centos:latest
docker save centos:latest > centos.tar
docker save -o centos.tar docker.io/centos

匯入

docker load -i mycentos.tar

save 是單純將 image 匯出 (原始樣子)，可以用 export 保持變動過的樣子

# 英文說明
# Save - Save one or more images to a tar archive
# Ecport - Export a container’s filesystem as a tar archive
docker export centos > centos.tar

# import, creates one image from one tarball which is not even an image (just a filesystem you want to import as an image)
# load, creates potentially multiple images from a tarred repository (since docker save can save multiple images in a tarball).
docker import centos.tar centos

docker export <CONTAINER ID> | docker import - some-image-name:latest

docker 的流程

# 跑一個 image
docker run -it centos:cross bash

# 如果要出來，用 exit 但它會讓 container EXITED
# 可以用 ctrl+p and ctrl+q 出來，container 仍會是 UP 的
# UP 時可以 attach 進去
docker attach eb9aa99cf129

# 如果是 EXITED 了，就 start 它
docker start eb9aa99cf129

# 可以一開始就背景執行 
docker run -d centos:cross bash

# 再 exec 進入，用 exec 進入的，exit 並不會讓 container EXITED
docker exec -it eb9aa99cf129 bash