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https://github.com/hanzoai/visor.git
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Ryan El KochtaandgVisor bot
2d7fdd3e23
Until [#14011](https://gvisor.dev/issues/14011) is addressed, this hopefully will reduce image_test's flakiness in asia-southeast. Also pins dind to Docker 29 to avoid any surprises in the future. PiperOrigin-RevId: 966634277
74 lines
2.5 KiB
Bash
Executable File
74 lines
2.5 KiB
Bash
Executable File
#!/bin/bash
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# Copyright 2024 The gVisor Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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set -xe -o pipefail
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USE_OVERLAY_DRIVER=true
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while [[ $# -gt 0 ]]; do
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case $1 in
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--no-overlay)
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USE_OVERLAY_DRIVER=false
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shift
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;;
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*)
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shift
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;;
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esac
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done
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# When dockerd uses the overlay storage driver, it will try to mount an overlay
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# filesystem under /var/lib/docker. gVisor only supports tmpfs as an upper
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# layer, so we mount a tmpfs if it isn't already present.
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if [[ "${USE_OVERLAY_DRIVER}" == "true" ]]; then
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current_fs=$(stat -f -c %T /var/lib/docker 2>/dev/null || echo "none")
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if [[ "${current_fs}" != "tmpfs" ]]; then
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mkdir -p /var/lib/docker
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mount -t tmpfs -o size="${DOCKER_TMPFS_SIZE:-2G}" tmpfs /var/lib/docker
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else
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echo "/var/lib/docker is already tmpfs, skipping mount."
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fi
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fi
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EXTRA_DOCKERD_FLAGS=()
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docker_version=$(dockerd --version)
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# Docker 29+ does not automatically fall back to the vfs driver when it cannot
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# mount an overlayfs, so we explicitly disable it when --no-overlay is passed.
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if [[ ${docker_version} =~ version\ ([0-9]+) ]] && [[ ${BASH_REMATCH[1]} -ge 29 ]]; then
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if [[ "${USE_OVERLAY_DRIVER}" != "true" ]]; then
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EXTRA_DOCKERD_FLAGS+=(--feature containerd-snapshotter=false)
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fi
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fi
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dev=$(ip route show default | sed 's/.*\sdev\s\(\S*\)\s.*$/\1/')
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addr=$(ip addr show dev "$dev" | grep -w inet | sed 's/^\s*inet\s\(\S*\)\/.*$/\1/')
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# TODO(gvisor.dev/issues/14011): until we investigate/fix gVisor's handling of
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# forwarding fragmented packets, match the host MTU in nested dockerd to make
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# it more reliable.
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mtu=$(ip -o link show dev "$dev" | sed -n 's/.*mtu \([0-9]*\).*/\1/p')
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IPTABLES="iptables"
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if command -v iptables-legacy >/dev/null 2>&1; then
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IPTABLES="iptables-legacy"
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fi
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echo 1 > /proc/sys/net/ipv4/ip_forward
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$IPTABLES -t nat -A POSTROUTING -o "$dev" -j SNAT --to-source "$addr" -p tcp
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$IPTABLES -t nat -A POSTROUTING -o "$dev" -j SNAT --to-source "$addr" -p udp
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exec dockerd-entrypoint.sh --iptables=false --ip6tables=false ${mtu:+--mtu="$mtu"} -D "${EXTRA_DOCKERD_FLAGS[@]}"
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