# APPTAINER.CONF
# This is the global configuration file for Apptainer. This file controls
# what the container is allowed to do on a particular host, and as a result
# this file must be owned by root.

# ALLOW SETUID: [BOOL]
# DEFAULT: yes
# Should we allow users to utilize the setuid program flow within Apptainer?
# note1: This is the default mode, and to utilize all features, this option
# must be enabled.  For example, without this option loop mounts of image 
# files will not work; only sandbox image directories, which do not need loop
# mounts, will work (subject to note 2).
# note2: If this option is disabled, it will rely on unprivileged user
# namespaces which have not been integrated equally between different Linux
# distributions.
allow setuid = yes

# MAX LOOP DEVICES: [INT]
# DEFAULT: 256
# Set the maximum number of loop devices that Apptainer should ever attempt
# to utilize.
max loop devices = 256

# ALLOW PID NS: [BOOL]
# DEFAULT: yes
# Should we allow users to request the PID namespace? Note that for some HPC
# resources, the PID namespace may confuse the resource manager and break how
# some MPI implementations utilize shared memory. (note, on some older
# systems, the PID namespace is always used)
allow pid ns = yes

# CONFIG PASSWD: [BOOL]
# DEFAULT: yes
# If /etc/passwd exists within the container, this will automatically append
# an entry for the calling user.
config passwd = yes

# CONFIG GROUP: [BOOL]
# DEFAULT: yes
# If /etc/group exists within the container, this will automatically append
# group entries for the calling user.
config group = yes

# CONFIG RESOLV_CONF: [BOOL]
# DEFAULT: yes
# If there is a bind point within the container, use the host's
# /etc/resolv.conf.
config resolv_conf = yes

# MOUNT PROC: [BOOL]
# DEFAULT: yes
# Should we automatically bind mount /proc within the container?
mount proc = yes

# MOUNT SYS: [BOOL]
# DEFAULT: yes
# Should we automatically bind mount /sys within the container?
mount sys = yes

# MOUNT DEV: [yes/no/minimal]
# DEFAULT: yes
# Should we automatically bind mount /dev within the container? If 'minimal'
# is chosen, then only 'null', 'zero', 'random', 'urandom', and 'shm' will
# be included (the same effect as the --contain options)
mount dev = yes

# MOUNT DEVPTS: [BOOL]
# DEFAULT: yes
# Should we mount a new instance of devpts if there is a 'minimal'
# /dev, or -C is passed?  Note, this requires that your kernel was
# configured with CONFIG_DEVPTS_MULTIPLE_INSTANCES=y, or that you're
# running kernel 4.7 or newer.
mount devpts = yes

# MOUNT HOME: [BOOL]
# DEFAULT: yes
# Should we automatically determine the calling user's home directory and
# attempt to mount it's base path into the container? If the --contain option
# is used, the home directory will be created within the session directory or
# can be overridden with the APPTAINER_HOME or APPTAINER_WORKDIR
# environment variables (or their corresponding command line options).
mount home = yes

# MOUNT TMP: [BOOL]
# DEFAULT: yes
# Should we automatically bind mount /tmp and /var/tmp into the container? If
# the --contain option is used, both tmp locations will be created in the
# session directory or can be specified via the  APPTAINER_WORKDIR
# environment variable (or the --workingdir command line option).
mount tmp = yes

# MOUNT HOSTFS: [BOOL]
# DEFAULT: no
# Probe for all mounted file systems that are mounted on the host, and bind
# those into the container?
mount hostfs = no

# BIND PATH: [STRING]
# DEFAULT: Undefined
# Define a list of files/directories that should be made available from within
# the container. The file or directory must exist within the container on
# which to attach to. you can specify a different source and destination
# path (respectively) with a colon; otherwise source and dest are the same.
# NOTE: these are ignored if apptainer is invoked with --contain except
# for /etc/hosts and /etc/localtime. When invoked with --contain and --net,
# /etc/hosts would contain a default generated content for localhost resolution.
#bind path = /etc/apptainer/default-nsswitch.conf:/etc/nsswitch.conf
#bind path = /opt
#bind path = /scratch
bind path = /etc/localtime
bind path = /etc/hosts

# USER BIND CONTROL: [BOOL]
# DEFAULT: yes
# Allow users to influence and/or define bind points at runtime? This will allow
# users to specify bind points, scratch and tmp locations. (note: User bind
# control is only allowed if the host also supports PR_SET_NO_NEW_PRIVS)
user bind control = yes

# ENABLE FUSEMOUNT: [BOOL]
# DEFAULT: yes
# Allow users to mount fuse filesystems inside containers with the --fusemount
# command line option.
enable fusemount = yes

# ENABLE OVERLAY: [yes/no/try/driver]
# DEFAULT: try
# Enabling this option will make it possible to specify bind paths to locations
# that do not currently exist within the container.  If 'try' is chosen,
# overlayfs will be tried but if it is unavailable it will be silently ignored.
# If 'driver' is chosen, overlayfs is handled by the image driver.
enable overlay = try

# ENABLE UNDERLAY: [yes/no]
# DEFAULT: yes
# Enabling this option will make it possible to specify bind paths to locations
# that do not currently exist within the container even if overlay is not
# working.  If overlay is available, it will be tried first.
enable underlay = yes

# MOUNT SLAVE: [BOOL]
# DEFAULT: yes
# Should we automatically propagate file-system changes from the host?
# This should be set to 'yes' when autofs mounts in the system should
# show up in the container.
mount slave = yes

# SESSIONDIR MAXSIZE: [STRING]
# DEFAULT: 64
# This specifies how large the default sessiondir should be (in MB). It will
# affect users who use the "--contain" options and don't also specify a
# location to do default read/writes to (e.g. "--workdir" or "--home") and
# it will also affect users of "--writable-tmpfs".
sessiondir max size = 64

# LIMIT CONTAINER OWNERS: [STRING]
# DEFAULT: NULL
# Only allow containers to be used that are owned by a given user. If this
# configuration is undefined (commented or set to NULL), all containers are
# allowed to be used. This feature only applies when Apptainer is running in
# SUID mode and the user is non-root.
#limit container owners = gmk, apptainer, nobody


# LIMIT CONTAINER GROUPS: [STRING]
# DEFAULT: NULL
# Only allow containers to be used that are owned by a given group. If this
# configuration is undefined (commented or set to NULL), all containers are
# allowed to be used. This feature only applies when Apptainer is running in
# SUID mode and the user is non-root.
#limit container groups = group1, apptainer, nobody


# LIMIT CONTAINER PATHS: [STRING]
# DEFAULT: NULL
# Only allow containers to be used that are located within an allowed path
# prefix. If this configuration is undefined (commented or set to NULL),
# containers will be allowed to run from anywhere on the file system. This
# feature only applies when Apptainer is running in SUID mode and the user is
# non-root.
#limit container paths = /scratch, /tmp, /global


# ALLOW CONTAINER ${TYPE}: [BOOL]
# DEFAULT: yes
# This feature limits what kind of containers that Apptainer will allow
# users to use (note this does not apply for root).  Note that some of the
# same operations can be limited in setuid mode by the ALLOW SETUID-MOUNT
# feature below; both types need to be "yes" to be allowed.
#
# Allow use of unencrypted SIF containers
allow container sif = yes
#
# Allow use of encrypted SIF containers
allow container encrypted = yes
#
# Allow use of non-SIF image formats
allow container squashfs = yes
allow container extfs = yes
allow container dir = yes

# ALLOW SETUID-MOUNT ${TYPE}: [BOOL]
# DEFAULT: yes, except no for extfs
# This feature limits what types of mounts that Apptainer will allow
# unprivileged users to use in setuid mode.  Normally these operations
# require the elevated privileges of setuid mode, although Apptainer
# has unprivileged alternatives for squashfs and extfs.  Note that some of
# the same operations can also be limited by the ALLOW CONTAINER feature
# above; both types need to be "yes" to be allowed.
#
# Allow mounting of SIF encryption (using the kernel device-mapper) in
# setuid mode
# allow setuid-mount encrypted = yes
#
# Allow mounting of squashfs filesystem types in setuid mode, both inside and
# outside of SIF files
# allow setuid-mount squashfs = yes
#
# Allow mounting of extfs filesystem types in setuid mode, both inside and
# outside of SIF files.  WARNING: this filesystem type frequently has
# relevant CVEs that take a very long time for vendors to patch because they
# are not considered to be High severity since normally unprivileged users do
# not have write access to the raw filesystem data.  This is why this option
# defaults to "no".  Change it at your own risk and consider using the
# LIMIT CONTAINER features above if you do.
# allow setuid-mount extfs = no

# ALLOW NET USERS: [STRING]
# DEFAULT: NULL
# Allow specified root administered CNI network configurations to be used by the
# specified list of users. By default only root may use CNI configuration,
# except in the case of a fakeroot execution where only 40_fakeroot.conflist
# is used. This feature only applies when Apptainer is running in
# SUID mode and the user is non-root.
#allow net users = gmk, apptainer


# ALLOW NET GROUPS: [STRING]
# DEFAULT: NULL
# Allow specified root administered CNI network configurations to be used by the
# specified list of users. By default only root may use CNI configuration,
# except in the case of a fakeroot execution where only 40_fakeroot.conflist
# is used. This feature only applies when Apptainer is running in
# SUID mode and the user is non-root.
#allow net groups = group1, apptainer


# ALLOW NET NETWORKS: [STRING]
# DEFAULT: NULL
# Specify the names of CNI network configurations that may be used by users and
# groups listed in the allow net users / allow net groups directives. Thus feature
# only applies when Apptainer is running in SUID mode and the user is non-root.
#allow net networks = bridge


# ALWAYS USE NV ${TYPE}: [BOOL]
# DEFAULT: no
# This feature allows an administrator to determine that every action command
# should be executed implicitly with the --nv option (useful for GPU only 
# environments). 
always use nv = no

# USE NVIDIA-NVIDIA-CONTAINER-CLI ${TYPE}: [BOOL]
# DEFAULT: no
# EXPERIMENTAL
# If set to yes, Apptainer will attempt to use nvidia-container-cli to setup
# GPUs within a container when the --nv flag is enabled.
# If no (default), the legacy binding of entries in nvbliblist.conf will be performed.
use nvidia-container-cli = no

# ALWAYS USE ROCM ${TYPE}: [BOOL]
# DEFAULT: no
# This feature allows an administrator to determine that every action command
# should be executed implicitly with the --rocm option (useful for GPU only
# environments).
always use rocm = no

# ROOT DEFAULT CAPABILITIES: [full/file/no]
# DEFAULT: full
# Define default root capability set kept during runtime
# - full: keep all capabilities (same as --keep-privs)
# - file: keep capabilities configured for root in
#         ${prefix}/etc/apptainer/capability.json
# - no: no capabilities (same as --no-privs)
root default capabilities = full

# MEMORY FS TYPE: [tmpfs/ramfs]
# DEFAULT: tmpfs
# This feature allow to choose temporary filesystem type used by Apptainer.
# Cray CLE 5 and 6 up to CLE 6.0.UP05 there is an issue (kernel panic) when Apptainer
# use tmpfs, so on affected version it's recommended to set this value to ramfs to avoid
# kernel panic
memory fs type = tmpfs

# CNI CONFIGURATION PATH: [STRING]
# DEFAULT: Undefined
# Defines path where CNI configuration files are stored
#cni configuration path =

# CNI PLUGIN PATH: [STRING]
# DEFAULT: Undefined
# Defines path where CNI executable plugins are stored
#cni plugin path =


# BINARY PATH: [STRING]
# DEFAULT: $PATH:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
# Colon-separated list of directories to search for many binaries.  May include
# "$PATH:", which will be replaced by the user's PATH when not running a binary
# that may be run with elevated privileges from the setuid program flow.  The
# internal bin ${prefix}/libexec/apptainer/bin is always included, either at the
# beginning of "$PATH:" if it is present or at the very beginning if "$PATH:" is
# not present.
# binary path = 

# MKSQUASHFS PROCS: [UINT]
# DEFAULT: 0 (All CPUs)
# This allows the administrator to specify the number of CPUs for mksquashfs 
# to use when building an image.  The fewer processors the longer it takes.
# To enable it to use all available CPU's set this to 0.
# mksquashfs procs = 0
mksquashfs procs = 0

# MKSQUASHFS MEM: [STRING]
# DEFAULT: Unlimited
# This allows the administrator to set the maximum amount of memory for mkswapfs
# to use when building an image.  e.g. 1G for 1gb or 500M for 500mb. Restricting memory
# can have a major impact on the time it takes mksquashfs to create the image.
# NOTE: This functionality did not exist in squashfs-tools prior to version 4.3
# If using an earlier version you should not set this.
# mksquashfs mem = 1G


# SHARED LOOP DEVICES: [BOOL]
# DEFAULT: no
# Allow to share same images associated with loop devices to minimize loop
# usage and optimize kernel cache (useful for MPI)
shared loop devices = no

# IMAGE DRIVER: [STRING]
# DEFAULT: Undefined
# This option specifies the name of an image driver provided by a plugin that
# will be used to handle image mounts. This will override the builtin image
# driver which provides unprivileged image mounts for squashfs, extfs, 
# overlayfs, and gocryptfs.  The overlayfs image driver will only be used
# if the kernel overlayfs is not usable, but if the 'enable overlay' option
# above is set to 'driver', the image driver will always be used for overlay.
# If the driver name specified has not been registered via a plugin installation
# the run-time will abort.
image driver = 

# DOWNLOAD CONCURRENCY: [UINT]
# DEFAULT: 3
# This option specifies how many concurrent streams when downloading (pulling)
# an image from cloud library.
download concurrency = 3

# DOWNLOAD PART SIZE: [UINT]
# DEFAULT: 5242880
# This option specifies the size of each part when concurrent downloads are
# enabled.
download part size = 5242880

# DOWNLOAD BUFFER SIZE: [UINT]
# DEFAULT: 32768
# This option specifies the transfer buffer size when concurrent downloads
# are enabled.
download buffer size = 32768

# SYSTEMD CGROUPS: [BOOL]
# DEFAULT: yes
# Whether to use systemd to manage container cgroups. Required for rootless cgroups
# functionality. 'no' will manage cgroups directly via cgroupfs.
systemd cgroups = yes