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Networking
Fedora now enables `systemd-resolved` service by default
With the enhancement, by enabling the `systemd-resolved` service by default, the GNU C Library (glibc) will perform name resolution using the `nss-resolve` module rather than the `nss-dns` module. Notable changes include:
`systemd-resolved` provides a system-level DNS cache that can substantially improve performance for applications that do not cache their own DNS results;
`systemd-resolved` allows correct handling of split DNS scenarios such as when VPNs are in use;
`/etc/resolv.conf` will now be managed by systemd-resolved rather than by NetworkManager;
`/etc/resolv.conf` will no longer be read when performing name resolution using `glibc`; however, it is still provided for compatibility with applications that manually read this file to perform name resolution;
Writing to `/etc/resolv.conf` will no longer work as expected.
NSS `dbm` support removal
Applications that use the Network Security Services (NSS) library often use a database for storing keys, certificates and trust. NSS supports two different storage formats:
SQLite
The `dbm` file format
Nowadays, NSS uses the SQLite file format by default and provides a transparent migration mechanism from `dbm` to SQLite.
The `dbm` file format has been deprecated since Fedora 28 due to various drawbacks, and from Fedora 33 `dbm` will not be supported.
This support removal will slightly reduce the size of the NSS library binary and the developers will be able to focus on the sole file format.