166 lines
4.3 KiB
Bash
Executable file
166 lines
4.3 KiB
Bash
Executable file
#!/usr/bin/env bash
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# SPDX-License-Identifier: MIT
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set -e
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source $(dirname $0)/lxc-helpers-lib.sh
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function verbose() {
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set -x
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PS4='${BASH_SOURCE[0]}:$LINENO: ${FUNCNAME[0]}: '
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LXC_VERBOSE=true
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}
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function help() {
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cat <<'EOF'
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lxc-helpers.sh - LXC container management helpers
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SYNOPSIS
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lxc-helpers.sh [-v|--verbose] [-h|--help]
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[-o|--os {bookworm|bullseye} (default bookworm)]
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command [arguments]
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lxc-helpers.sh [-v|--verbose] [-h|--help]
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[-o|--os {bookworm|bullseye} (default bookworm)]
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[-c|--config {unprivileged lxc libvirt docker k8s} (default "lxc libvirt docker")]
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lxc_container_create [arguments]
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DESCRIPTION
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A thin shell based layer on top of LXC to create, populate, run and
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destroy LXC containers. A container is created from a copy of an
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existing container.
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The LXC network is configured to provide a NAT'ed IP address (IPv4
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and IPv6) to each container, in a configurable private range.
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CREATE AND DESTROY
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lxc_prepare_environment
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Install LXC dependencies.
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lxc_container_create `name`
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Create the `name` container.
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lxc_container_mount `name` `path`
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Configure `name` container to bind mount `path` so that it is
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also accessible at `path` from within the container.
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lxc_container_start `name`
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Start the `name` container.
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lxc_container_stop `name`
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Stop the `name` container.
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lxc_container_destroy `name`
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Call lxc_container_stop `name` and destroy the container.
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lxc_template_release
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Echo the name of the container for the Operating System
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specified with `--os`.
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lxc_build_template `existing_container` `new_container`
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Copy `existing_container` into `new_container`. If
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`existing_container` is equal to $(lxc-helpers.sh lxc_template_release) it
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will be created on demand.
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CONFIGURATION
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The `--config` option provides preset configurations appended to the `/var/lib/lxc/name/config`
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file when the container is created with the `lxc_container_create` command. They are required
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to run the corresponding subsystem:
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* `docker` https://www.docker.com/
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* `lxc` https://linuxcontainers.org/lxc/
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* `libvirt` https://libvirt.org/
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* `k8s` https://kubernetes.io/
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* `unprivileged` none of the above
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Example: lxc-helpers.sh --config "docker libvirt" lxc_container_create mycontainer
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The `unprivileged` configuration does not add anything.
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ACTIONS IN THE CONTAINER
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For some command lxc_something `name` that can be called from outside the container
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there is an equivalent function lxc_something_inside that can be called from inside
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the container.
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lxc_install_lxc `name` `prefix` [`prefixv6`]
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lxc_install_lxc_inside `prefix` [`prefixv6`]
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Install LXC in the `name` container to allow the creation of
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named containers. `prefix` is a class C IP prefix from which
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containers will obtain their IP (for instance 10.40.50). `prefixv6`
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is an optional IPv6 private address prefix that defaults to fc15.
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lxc_container_run `name` command [options...]
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Run the `command` within the `name` container.
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lxc_container_run_script `name` `path`
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lxc_container_run_script_as `name` `user` `path`
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Run the script found at `path` within the `name` container. The
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environment is cleared before running the script. The first form
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will run as root, the second form will impersonate `user`.
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lxc_container_user_install `name` `user_id` `user` [`homedir` default `/home`]
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Create the `user` with `user_id` in the `name` container with a
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HOME at `/homedir/user`. Passwordless sudo permissions are
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granted to `user`. It is made a member of the groups docker, kvm
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and libvirt if they exist already. A SSH key is created.
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Example: lxc_container_user_install mycontainer $(id -u) $USER
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EOF
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}
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function main() {
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local options=$(getopt -o hvoc --long help,verbose,os:,config: -- "$@")
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[ $? -eq 0 ] || {
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echo "Incorrect options provided"
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exit 1
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}
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eval set -- "$options"
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while true; do
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case "$1" in
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-v | --verbose)
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verbose
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;;
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-h | --help)
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help
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;;
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-o | --os)
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LXC_CONTAINER_RELEASE=$2
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shift
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;;
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-c | --config)
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LXC_CONTAINER_CONFIG="$2"
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shift
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;;
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--)
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shift
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break
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;;
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esac
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shift
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done
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lxc_maybe_sudo
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"$@"
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}
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main "$@"
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