v3.2.0-RC2

This is the second release candidate for Podman v3.2.0. We expect a final RC early next week, and a final release late next week if all goes well

Preliminary release notes follow:

Features

• Docker Compose is now supported with rootless Podman (#9169).
• The podman network connect, podman network disconnect, and podman network reload commands have been enabled for rootless Podman.
• An experimental new set of commands, podman machine, was added to assist in managing virtual machines containing a Podman server. These are intended for easing the use of Podman on OS X by handling the creation of a Linux VM for running Podman.
• The podman generate kube command can now be run on Podman named volumes (generating PersistentVolumeClaim YAML), in addition to pods and containers.
• The podman play kube command now supports two new options, --ip and --mac, to set static IPs and MAC addresses for created pods (#8442 and #9731).
• The podman play kube command's support for PersistentVolumeClaim YAML has been greatly improved.
• The podman generate kube command now preserves the label used by podman auto-update to identify containers to update as a Kubernetes annotation, and the podman play kube command will convert this annotation back into a label. This allows podman auto-update to be used with containers created by podman play kube.
• The podman play kube command now supports Kubernetes secretRef YAML (using the secrets support from podman secret) for environment variables.
• Secrets can now be added to containers as environment variables using the type=env option to the --secret flag to podman create and podman run.
• The podman start command now supports the --all option, allowing all containers to be started simultaneously with a single command. The --filter option has also been added to filter which containers to start when --all is used.
• Filtering containers with the --filter option to podman ps and podman start now supports a new filter, restart-policy, to filter containers based on their restart policy.
• The --group-add option to rootless podman run and podman create now accepts a new value, keep-groups, which instructs Podman to retain the supplemental groups of the user running Podman in the created container. This is only supported with the crun OCI runtime.
• The podman run and podman create commands now support a new option, --timeout. This sets a maximum time the container is allowed to run, after which it is killed (#6412).
• The podman run and podman create commands now support a new option, --pidfile. This will create a file when the container is started containing the PID of the first process in the container.
• The podman run and podman create commands now support a new option, --requires. The --requires option adds dependency containers - containers that must be running before the current container. Commands like podman start will automatically start the requirements of a container before starting the container itself.
• Auto-updating containers can now be done with locally-built images, not just images hosted on a registry, by creating containers with the io.containers.autoupdate label set to local.
• Podman now supports the Container Device Interface (CDI) standard.
• Podman now adds an entry to /etc/hosts, host.containers.internal, pointing to the current gateway (which, for root containers, is usually a bridge interface on the host system) (#5651).
• The podman ps, podman pod ps, podman network list, podman secret list, and podman volume list commands now support a --noheading option, which will cause Podman to omit the heading line including column names.
• The podman unshare command now supports a new flag, --rootless-cni, to join the rootless network namespace. This allows commands to be run in the same network environment as rootless containers with CNI networking.
• The --security-opt unmask= option to podman run and podman create now supports glob operations to unmask a group of paths at once (e.g. podman run --security-opt unmask=/proc/* ... will unmask all paths in /proc in the container).
• The podman network prune command now supports a --filter option to filter which networks will be pruned.

Changes

• The change in Podman 3.1.2 where the :z and :Z mount options for volumes were ignored for privileged containers has been reverted after discussion in #10209.
• Podman's rootless CNI functionality no longer requires a sidecar container! The removal of the requirement for the rootless-cni-infra container means that rootless CNI is now usable on all architectures, not just AMD64, and no longer requires pulling an image (#8709).
• The Image handling code used by Podman has seen a major rewrite to improve code sharing with our other projects, Buildah and CRI-O. This should result in fewer bugs and performance gains in the long term. Work on this is still ongoing.
• The podman auto-update command now prunes previous versions of images after updating if they are unused, to prevent disk exhaustion after repeated updates (#10190).
• The podman play kube now treats environment variables configured as references to a ConfigMap as mandatory unless the optional parameter was set; this better matches the behavior of Kubernetes.
• Podman now supports the --context=default flag from Docker as a no-op for compatibility purposes.
• When Podman is run as root, but without CAP_SYS_ADMIN being available, it will run in a user namespace using the same code as rootless Podman (instead of failing outright).
• The podman info command now includes the path of the Seccomp profile Podman is using, and whether Podman is connected to a remote service or running containers locally.
• Containers created with the --rm option now automatically use the volatile storage flag when available for their root filesystems, causing them not to write changes to disk as often as they will be removed at completion anyways. This should result in improved performance.
• The podman generate systemd --new command will now include environment variables referenced by the container in generated unit files if the value would be looked up from the system environment.
• Podman now requires that Conmon v2.0.24 be available.

Bugfixes

• Fixed a bug where the remote Podman client's podman build command did not support the --arch, --platform, and --os, options.
• Fixed a bug where the remote Podman client's podman build command ignored the --rm=false option (#9869).
• Fixed a bug where the podman generate systemd --new command could generate extra --iidfile arguments if the container was already created with one.
• Fixed a bug where the podman generate kube command produced incorrect YAML for containers which bind-mounted both / and /root from the host system into the container (#9764).
• Fixed a bug where pods created by podman play kube from YAML that specified ShareProcessNamespace would only share the PID namespace (and not also the UTS, Network, and IPC namespaces) (#9128).
• Fixed a bug where the podman network reload command could generate spurious error messages when iptables-nft was in use.
• Fixed a bug where rootless Podman could fail to attach to containers when the user running Podman had a large UID.
• Fixed a bug where the podman ps command could fail with a no such container error due to a race condition with container removal (#10120).
• Fixed a bug where containers using the slirp4netns network mode and setting a custom slirp4netns subnet while using the rootlesskit port forwarder would not be able to forward ports (#9828).
• Fixed a bug where the --filter ancestor= option to podman ps did not require an exact match of the image name/ID to include a container in its results.
• Fixed a bug where the --filter until= option to podman image prune would prune images created after the specified time (instead of before).
• Fixed a bug where setting a custom Seccomp profile via the seccomp_profile option in containers.conf had no effect, and the default profile was used instead.
• Fixed a bug where the --cgroup-parent option to podman create and podman run was ignored in rootless Podman on cgroups v2 systems with the cgroupfs cgroup manager (#10173).
• Fixed a bug where the IMAGE and NAME variables in podman container runlabel were not being correctly substituted (#10192).
• Fixed a bug where the remote Podman client's podman build --iidfile command could include extra output (in addition to just the image ID) in the image ID file written (#10233).
• Fixed a bug where Podman could freeze when creating containers with a specific combination of volumes and working directory (#10216).
• Fixed a bug where rootless Podman containers restarted by restart policy (e.g. containers created with --restart=always) would lose networking after being restarted (#8047).

API

• Fixed a bug where the Compat Create endpoint for Containers did not allow advanced network options to be set (#10110).
• Fixed a bug where the Compat Create endpoint for Containers ignored static IP information provided in the IPAMConfig block (#10245).
• Fixed a bug where the Compat Inspect endpoint for Containers returned null (instead of an empty list) for Networks when the container was not joined to a CNI network (#9837).
• Fixed a bug where the Compat Wait endpoint for Containers could miss containers exiting if they were immediately restarted.
• Fixed a bug where the Compat Create endpoint for Volumes required that the user provide a name for the new volume (#9803).
• Fixed a bug where the Libpod Info handler would sometimes not return the correct path to the Podman API socket.
• Fixed a bug where the Compat Events handler used the wrong name for container exited events (died instead of die) (#10168).

Misc

• Updated Buildah to v1.21.0
• Updated the containers/common library to v0.38.4
• Updated the containers/storage library to v1.31.1