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+On a server that is not blocked by GFW:
+
+```
+docker pull gitea/runner-images:ubuntu-latest
+docker tag gitea/runner-images:ubuntu-latest focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest
+docker save focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest | gzip > image.tar.gz
+```
+
+Then send `image.tar.gz` to the server you want. However, `scp` is very slow, it is better to download that file from SJTU server.
+
+On the SJTU server:
+
+```
+docker image load --input image.tar.gz
+docker push focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest
+```
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