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Is there a limit to the number of parallel Docker push/pulls you can do?
E.g. if you thread Docker pull / push commands such that they are pulling/pushing different images at the same time what would be the upper limit to the number of parallel push/pulls
Or alternatively
On one terminal you do docker pull ubuntu on another you do docker pull httpd etc - what would be the limit Docker would support?
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Pull rates limits are based on individual IP address. For anonymous users, the rate limit is set to 100 pulls per 6 hours per IP address. For authenticated users, it is 200 pulls per 6 hour period. Users with a paid Docker subscription get up to 5000 pulls per day.
All you have to do to avoid Docker's new rate-limit error is authenticate to your Docker Hub account. After you've authenticated to the account, you won't be pulling the image as an anonymous user but as an authenticated user.
Pull a repository with multiple images By default, docker pull pulls a single image from the registry. A repository can contain multiple images. To pull all images from a repository, provide the -a (or --all-tags ) option when using docker pull .
Will it overwrite existing image with the latest version? Yep.
The options are set in the configuration file (Linux-based OS it is located in the path: /etc/docker/daemon.json and C:\ProgramData\docker\config\daemon.json on Windows)
Open /etc/docker/daemon.json (If doesn't exist, create it)
Add the values(for push/pulls) and set parallel operations limit
{ "max-concurrent-uploads": 1, "max-concurrent-downloads": 1 } Restart daemon: sudo service docker restart
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