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You can follow these steps to upload a Docker container on a CentOS 7 Linux server:

1. Install Docker on your CentOS 7 server if it is not already installed. You can do this by running the command:

sudo yum install docker

1. After Docker is installed, start the Docker service by running the command:

sudo systemctl start docker

1. Pull the Docker container that you want to upload from Docker Hub or a private registry. You can do this by running the command:

sudo docker pull <container_name>

1. Once you have the container on your CentOS 7 server, you can tag the container with a name and version by running the command:

sudo docker tag <container_name> <tag_name>

1. Now you can push the tagged container to a Docker registry by running the command:

sudo docker push <registry_hostname>/<tag_name>

1. If you are using a private registry, you may need to authenticate before pushing the container. You can do this by running the command:

sudo docker login -u <username> -p <password> <registry_hostname>

After following these steps, your Docker container should be successfully uploaded to your CentOS 7 server.