After having the new Unifi Dream Router for a while i had the desire to add additional services like NTP. For this you’ll need a container engine like podman which unfortunately isn’t pre-installed anymore.

On-Boot Script

Install the unifios-utilities according to instructions :

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curl -fsL "https://raw.githubusercontent.com/unifi-utilities/unifios-utilities/HEAD/on-boot-script/remote_install.sh" | /bin/sh

The directory /mnt/data/on_boot.d should now be available.

Installation of Podman

  • Navigate to the Build-Overview of the unifios-utilities: https://github.com/unifi-utilities/unifios-utilities/actions . Click on “UDM-SE Podman”. Download the file “udmse-podman-install.zip” from the artifacts section.

  • Unpack the file - this unpackts “podman-install.zip”.

  • Create a persistent directory on the UDR:

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    mkdir -p /mnt/data/podman/
    
  • Move the file “podman-install.zip” to the UDR (e.g. via WinSCP) into the directory (/mnt/data/podman/).

  • Then unpack the file (this is the “installation”)

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    cd /mnt/data/podman/
    unzip podman-install.zip
    

Configuraion of Podman

Now various config files have to be created.

Docker Registry Config

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mkdir -p /mnt/data/podman/etc/containers/registries.conf.d
cat > /mnt/data/podman/etc/containers/registries.conf.d/dockerio.conf <<EOF
unqualified-search-registries=["docker.io"]
EOF

Container Policy

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mkdir -p /mnt/data/podman/etc/containers/
cat > /mnt/data/podman/etc/containers/policy.json <<EOF
{
    "default": [
        {
            "type": "insecureAcceptAnything"
        }
    ],
    "transports":
        {
            "docker-daemon":
                {
                    "": [{"type":"insecureAcceptAnything"}]
                }
        }
}
EOF

Storage Config

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mkdir -p /mnt/data/podman/etc/containers/
cat > /mnt/data/podman/etc/containers/storage.conf <<EOF
# This file is is the configuration file for all tools
# that use the containers/storage library. The storage.conf file
# overrides all other storage.conf files. Container engines using the
# container/storage library do not inherit fields from other storage.conf
# files.
#
#  Note: The storage.conf file overrides other storage.conf files based on this precedence:
#      /usr/containers/storage.conf
#      /etc/containers/storage.conf
#      $HOME/.config/containers/storage.conf
#      $XDG_CONFIG_HOME/containers/storage.conf (If XDG_CONFIG_HOME is set)
# See man 5 containers-storage.conf for more information
# The "container storage" table contains all of the server options.
[storage]

# Default Storage Driver, Must be set for proper operation.
driver = "vfs"

# Temporary storage location
runroot = "/run/containers/storage"

# Primary Read/Write location of container storage
# When changing the graphroot location on an SELINUX system, you must
# ensure  the labeling matches the default locations labels with the
# following commands:
# semanage fcontext -a -e /var/lib/containers/storage /NEWSTORAGEPATH
# restorecon -R -v /NEWSTORAGEPATH
graphroot = "/var/lib/containers/storage"


# Storage path for rootless users
#
# rootless_storage_path = "$HOME/.local/share/containers/storage"

[storage.options]
# Storage options to be passed to underlying storage drivers

# AdditionalImageStores is used to pass paths to additional Read/Only image stores
# Must be comma separated list.
additionalimagestores = [
]

# Remap-UIDs/GIDs is the mapping from UIDs/GIDs as they should appear inside of
# a container, to the UIDs/GIDs as they should appear outside of the container,
# and the length of the range of UIDs/GIDs.  Additional mapped sets can be
# listed and will be heeded by libraries, but there are limits to the number of
# mappings which the kernel will allow when you later attempt to run a
# container.
#
# remap-uids = 0:1668442479:65536
# remap-gids = 0:1668442479:65536

# Remap-User/Group is a user name which can be used to look up one or more UID/GID
# ranges in the /etc/subuid or /etc/subgid file.  Mappings are set up starting
# with an in-container ID of 0 and then a host-level ID taken from the lowest
# range that matches the specified name, and using the length of that range.
# Additional ranges are then assigned, using the ranges which specify the
# lowest host-level IDs first, to the lowest not-yet-mapped in-container ID,
# until all of the entries have been used for maps.
#
# remap-user = "containers"
# remap-group = "containers"

# Root-auto-userns-user is a user name which can be used to look up one or more UID/GID
# ranges in the /etc/subuid and /etc/subgid file.  These ranges will be partitioned
# to containers configured to create automatically a user namespace.  Containers
# configured to automatically create a user namespace can still overlap with containers
# having an explicit mapping set.
# This setting is ignored when running as rootless.
# root-auto-userns-user = "storage"
#
# Auto-userns-min-size is the minimum size for a user namespace created automatically.
# auto-userns-min-size=1024
#
# Auto-userns-max-size is the minimum size for a user namespace created automatically.
# auto-userns-max-size=65536

[storage.options.overlay]
# ignore_chown_errors can be set to allow a non privileged user running with
# a single UID within a user namespace to run containers. The user can pull
# and use any image even those with multiple uids.  Note multiple UIDs will be
# squashed down to the default uid in the container.  These images will have no
# separation between the users in the container. Only supported for the overlay
# and vfs drivers.
#ignore_chown_errors = "false"

# Inodes is used to set a maximum inodes of the container image.
# inodes = ""

# Path to an helper program to use for mounting the file system instead of mounting it
# directly.
#mount_program = "/usr/bin/fuse-overlayfs"

# mountopt specifies comma separated list of extra mount options
mountopt = "nodev"

# Set to skip a PRIVATE bind mount on the storage home directory.
# skip_mount_home = "false"

# Size is used to set a maximum size of the container image.
# size = ""

# ForceMask specifies the permissions mask that is used for new files and
# directories.
#
# The values "shared" and "private" are accepted.
# Octal permission masks are also accepted.
#
#  "": No value specified.
#     All files/directories, get set with the permissions identified within the
#     image.
#  "private": it is equivalent to 0700.
#     All files/directories get set with 0700 permissions.  The owner has rwx
#     access to the files. No other users on the system can access the files.
#     This setting could be used with networked based homedirs.
#  "shared": it is equivalent to 0755.
#     The owner has rwx access to the files and everyone else can read, access
#     and execute them. This setting is useful for sharing containers storage
#     with other users.  For instance have a storage owned by root but shared
#     to rootless users as an additional store.
#     NOTE:  All files within the image are made readable and executable by any
#     user on the system. Even /etc/shadow within your image is now readable by
#     any user.
#
#   OCTAL: Users can experiment with other OCTAL Permissions.
#
#  Note: The force_mask Flag is an experimental feature, it could change in the
#  future.  When "force_mask" is set the original permission mask is stored in
#  the "user.containers.override_stat" xattr and the "mount_program" option must
#  be specified. Mount programs like "/usr/bin/fuse-overlayfs" present the
#  extended attribute permissions to processes within containers rather then the
#  "force_mask"  permissions.
#
# force_mask = ""

[storage.options.thinpool]
# Storage Options for thinpool

# autoextend_percent determines the amount by which pool needs to be
# grown. This is specified in terms of % of pool size. So a value of 20 means
# that when threshold is hit, pool will be grown by 20% of existing
# pool size.
# autoextend_percent = "20"

# autoextend_threshold determines the pool extension threshold in terms
# of percentage of pool size. For example, if threshold is 60, that means when
# pool is 60% full, threshold has been hit.
# autoextend_threshold = "80"

# basesize specifies the size to use when creating the base device, which
# limits the size of images and containers.
# basesize = "10G"

# blocksize specifies a custom blocksize to use for the thin pool.
# blocksize="64k"

# directlvm_device specifies a custom block storage device to use for the
# thin pool. Required if you setup devicemapper.
# directlvm_device = ""

# directlvm_device_force wipes device even if device already has a filesystem.
# directlvm_device_force = "True"

# fs specifies the filesystem type to use for the base device.
# fs="xfs"

# log_level sets the log level of devicemapper.
# 0: LogLevelSuppress 0 (Default)
# 2: LogLevelFatal
# 3: LogLevelErr
# 4: LogLevelWarn
# 5: LogLevelNotice
# 6: LogLevelInfo
# 7: LogLevelDebug
# log_level = "7"

# min_free_space specifies the min free space percent in a thin pool require for
# new device creation to succeed. Valid values are from 0% - 99%.
# Value 0% disables
# min_free_space = "10%"

# mkfsarg specifies extra mkfs arguments to be used when creating the base
# device.
# mkfsarg = ""

# metadata_size is used to set the 'pvcreate --metadatasize' options when
# creating thin devices. Default is 128k
# metadata_size = ""

# Size is used to set a maximum size of the container image.
# size = ""

# use_deferred_removal marks devicemapper block device for deferred removal.
# If the thinpool is in use when the driver attempts to remove it, the driver
# tells the kernel to remove it as soon as possible. Note this does not free
# up the disk space, use deferred deletion to fully remove the thinpool.
# use_deferred_removal = "True"

# use_deferred_deletion marks thinpool device for deferred deletion.
# If the device is busy when the driver attempts to delete it, the driver
# will attempt to delete device every 30 seconds until successful.
# If the program using the driver exits, the driver will continue attempting
# to cleanup the next time the driver is used. Deferred deletion permanently
# deletes the device and all data stored in device will be lost.
# use_deferred_deletion = "True"

# xfs_nospace_max_retries specifies the maximum number of retries XFS should
# attempt to complete IO when ENOSPC (no space) error is returned by
# underlying storage device.
# xfs_nospace_max_retries = "0"
EOF

Max logsize Config

Sets a limit of container logs (similar to container-common  for unifi devices with podman). 104857600 Bytes = 100 Megabytes

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cat > /mnt/data/podman/etc/containers/libpod.conf <<EOF
max_log_size = 104857600
EOF

Boot Script

This script ensures that podman is fully installed on the start of the UDR. All binaries are therefore linked from the persistent directory.

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cat > /mnt/data/on_boot.d/07-podman.sh <<EOF
#!/bin/bash

mkdir -p /usr/share/containers
mkdir -p /usr/libexec/podman
mkdir -p /etc/containers
mkdir -p /etc/containers/registries.conf.d

ln -sf /mnt/data/podman/usr/share/containers/seccomp.json /usr/share/containers/seccomp.json
ln -sf /mnt/data/podman/usr/libexec/podman/conmon /usr/libexec/podman/conmon
ln -sf /mnt/data/podman/usr/bin/runc /usr/bin/runc
ln -sf /mnt/data/podman/usr/bin/podman /usr/bin/podman
ln -sf /mnt/data/podman/etc/containers/containers.conf /etc/containers/containers.conf
ln -sf /mnt/data/podman/etc/containers/policy.json /etc/containers/policy.json
ln -sf /mnt/data/podman/etc/containers/storage.conf /etc/containers/storage.conf
ln -sf /mnt/data/podman/etc/containers/libpod.conf /etc/containers/libpod.conf
ln -sf /mnt/data/podman/etc/containers/registries.conf.d/dockerio.conf /etc/containers/registries.conf.d/dockerio.conf
EOF
chmod a+x /mnt/data/on_boot.d/07-podman.sh

Quellen