[FORGEJO] upgrade lxc-heplers to be k8s capable
cascading-pr from https://code.forgejo.org/forgejo/lxc-helpers/pulls/4 Co-authored-by: cascading-pr <cascading-pr@example.com> Reviewed-on: https://code.forgejo.org/forgejo/act/pulls/16 Co-authored-by: cascading-pr <cascading-pr@noreply.code.forgejo.org> Co-committed-by: cascading-pr <cascading-pr@noreply.code.forgejo.org>
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cascading-pr
earl-warren
parent
2d798f7010
commit
7378310068
2 changed files with 150 additions and 22 deletions
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@ -5,9 +5,12 @@ export DEBIAN_FRONTEND=noninteractive
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LXC_SELF_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
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LXC_BIN=/usr/local/bin
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LXC_CONTAINER_CONFIG_ALL="unprivileged lxc libvirt docker k8s"
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LXC_CONTAINER_CONFIG_DEFAULT="lxc libvirt docker"
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: ${LXC_SUDO:=}
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: ${LXC_CONTAINER_RELEASE:=bookworm}
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: ${LXC_CONTAINER_CONFIG:=$LXC_CONTAINER_CONFIG_DEFAULT}
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: ${LXC_HOME:=/home}
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: ${LXC_VERBOSE:=false}
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@ -105,42 +108,138 @@ function lxc_prepare_environment() {
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fi
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}
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function lxc_container_configure() {
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local name="$1"
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function lxc_container_config_nesting() {
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echo 'security.nesting = true'
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}
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$LXC_SUDO tee -a $(lxc_config $name) > /dev/null <<'EOF'
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security.nesting = true
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lxc.cap.drop =
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lxc.apparmor.profile = unconfined
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function lxc_container_config_cap() {
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echo 'lxc.cap.drop ='
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}
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function lxc_container_config_net() {
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cat <<EOF
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#
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# /dev/net (docker won't work without /dev/net/tun)
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# /dev/net
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#
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lxc.cgroup2.devices.allow = c 10:200 rwm
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lxc.mount.entry = /dev/net dev/net none bind,create=dir 0 0
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EOF
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}
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function lxc_container_config_kvm() {
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cat <<EOF
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#
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# /dev/kvm (libvirt / kvm won't work without /dev/kvm)
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# /dev/kvm
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#
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lxc.cgroup2.devices.allow = c 10:232 rwm
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lxc.mount.entry = /dev/kvm dev/kvm none bind,create=file 0 0
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EOF
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}
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function lxc_container_config_loop() {
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cat <<EOF
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#
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# /dev/loop
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#
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lxc.cgroup2.devices.allow = c 10:237 rwm
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lxc.cgroup2.devices.allow = b 7:* rwm
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lxc.mount.entry = /dev/loop-control dev/loop-control none bind,create=file 0 0
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EOF
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}
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function lxc_container_config_mapper() {
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cat <<EOF
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#
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# /dev/mapper
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#
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lxc.cgroup2.devices.allow = c 10:236 rwm
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lxc.mount.entry = /dev/mapper dev/mapper none bind,create=dir 0 0
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EOF
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}
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function lxc_container_config_fuse() {
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cat <<EOF
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#
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# /dev/fuse
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#
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lxc.cgroup2.devices.allow = b 10:229 rwm
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lxc.mount.entry = /dev/fuse dev/fuse none bind,create=file 0 0
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EOF
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}
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function lxc_container_config_kmsg() {
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cat <<EOF
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#
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# kmsg
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#
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lxc.cgroup2.devices.allow = c 1:11 rwm
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lxc.mount.entry = /dev/kmsg dev/kmsg none bind,create=file 0 0
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EOF
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}
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function lxc_container_config_proc() {
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cat <<EOF
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#
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# /proc
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#
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#
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# Only because k8s tries to write /proc/sys/vm/overcommit_memory
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# is there a way to only allow that? Would it be enough for k8s?
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#
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lxc.mount.auto = proc:rw
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EOF
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}
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function lxc_container_config() {
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for config in "$@" ; do
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case $config in
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unprivileged)
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;;
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lxc)
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echo nesting
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echo cap
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;;
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docker)
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echo net
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;;
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libvirt)
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echo cap
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echo kvm
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echo loop
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echo mapper
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echo fuse
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;;
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k8s)
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echo cap
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echo loop
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echo mapper
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echo fuse
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echo kmsg
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echo proc
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;;
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*)
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echo "$config unknown ($LXC_CONTAINER_CONFIG_ALL)"
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return 1
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;;
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esac
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done | sort -u | while read config ; do
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echo "#"
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echo "# include $config config snippet"
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echo "#"
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lxc_container_config_$config
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done
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}
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function lxc_container_configure() {
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local name="$1"
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lxc_container_config $LXC_CONTAINER_CONFIG | $LXC_SUDO tee -a $(lxc_config $name)
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}
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function lxc_container_install_lxc_helpers() {
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local name="$1"
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$LXC_SUDO cp -a $LXC_SELF_DIR/lxc-helpers*.sh $root/$LXC_BIN
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#
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# Wait for the network to come up
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#
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@ -231,10 +330,13 @@ function lxc_build_template_release() {
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fi
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local root=$(lxc_root $name)
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local packages="sudo,git,python3"
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$LXC_SUDO lxc-create --name $name --template debian -- --release=$LXC_CONTAINER_RELEASE --packages="$packages"
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$LXC_SUDO cp -a $LXC_SELF_DIR/lxc-helpers*.sh $root/$LXC_BIN
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lxc_container_configure $name
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$LXC_SUDO lxc-create --name $name --template debian -- --release=$LXC_CONTAINER_RELEASE
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echo 'lxc.apparmor.profile = unconfined' | $LXC_SUDO tee -a $(lxc_config $name)
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lxc_container_install_lxc_helpers $name
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lxc_container_start $name
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lxc_container_run $name apt-get update -qq
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lxc_apt_install $name sudo git python3
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lxc_container_stop $name
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}
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function lxc_build_template() {
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@ -253,6 +355,7 @@ function lxc_build_template() {
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echo lxc-copy --name=$name --newname=$newname failed
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return 1
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fi
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lxc_container_configure $name
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}
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function lxc_apt_install() {
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@ -263,7 +366,7 @@ function lxc_apt_install() {
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}
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function lxc_apt_install_inside() {
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DEBIAN_FRONTEND=noninteractive apt-get install -y -qq "$@"
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apt-get install -y -qq "$@"
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}
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function lxc_install_lxc() {
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@ -283,11 +386,11 @@ function lxc_install_lxc_inside() {
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lxc_apt_install_inside $packages
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if ! systemctl is-active --quiet lxc-net; then
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if ! grep --quiet LXC_ADDR=.$prefix.1. /etc/default/lxc-net ; then
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systemctl disable --now dnsmasq
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apt-get install -y -qq lxc
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systemctl stop lxc-net
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sed -i -e '/ConditionVirtualization/d' $root/usr/lib/systemd/system/lxc-net.service
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sed -i -e '/ConditionVirtualization/d' /usr/lib/systemd/system/lxc-net.service
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systemctl daemon-reload
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cat >> /etc/default/lxc-net <<EOF
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LXC_ADDR="$prefix.1"
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@ -21,6 +21,11 @@ SYNOPSIS
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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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@ -65,6 +70,22 @@ CREATE AND DESTROY
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`existing_container` is equal to $(lxc-helpers.sh lxc_template_release) it
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will be created on demand.
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CONFIGURATION
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The `--config` option provides preset configurations appended to the `/var/lib/lxc/name/config`
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file when the container is created with the `lxc_container_create` command. They are required
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to run the corresponding subsystem:
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* `docker` https://www.docker.com/
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* `lxc` https://linuxcontainers.org/lxc/
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* `libvirt` https://libvirt.org/
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* `k8s` https://kubernetes.io/
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* `unprivileged` none of the above
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Example: lxc-helpers.sh --config "docker libvirt" lxc_container_create mycontainer
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The `unprivileged` configuration does not add anything.
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ACTIONS IN THE CONTAINER
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For some command lxc_something `name` that can be called from outside the container
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@ -102,7 +123,7 @@ EOF
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}
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function main() {
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local options=$(getopt -o hvo --long help,verbose,os: -- "$@")
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local options=$(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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@ -120,6 +141,10 @@ function main() {
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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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