To ensure that downloaded packages are genuine, yum verifies the digital signature of each package against the public key of the provider.

If you press N or Enter, yum stops without installing any packages. This is an example of the public key import: warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 443E1821 public key not available for Retrieving GPG key from Importing GPG key 0x443E1821 'CentOS-4 Key' Is this ok : Example 2. Format of yum Public Key Import Check the public key, and then press y to import the key and authorize the key for use. The transaction may include the installation, update, or removal of additional packages, in order to resolve software dependencies. The yum utility searches these data files to determine the best set of actions to produce the required result, and displays the transaction for you to approve. If your system uses a slow network connection yum may require several seconds to download the repository indexes and the header files for each package. For each operation, yum downloads the latest package information from the configured repositories. To use yum, specify a function and one or more packages or package groups.

Refer to for details of using yum to install software from an individual package file. Installing Software from a Package File The yum commands shown in this section use repositories as package sources.

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