208 lines
9.9 KiB
Docker
208 lines
9.9 KiB
Docker
# Copyright 2018 The Kubernetes 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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# kind node base image
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#
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# For systemd + docker configuration used below, see the following references:
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# https://systemd.io/CONTAINER_INTERFACE/
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# multi-tage docker build so we can build auto-pause for arm64
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FROM golang:1.16
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WORKDIR /src
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# becaue auto-pause binary depends on minikube's code we need to pass the whole source code as the context
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ADD . .
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RUN cd ./cmd/auto-pause/ && go build
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# start from ubuntu 20.04, this image is reasonably small as a starting point
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# for a kubernetes node image, it doesn't contain much we don't need
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FROM ubuntu:focal-20210401
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ARG BUILDKIT_VERSION="v0.9.0"
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# copy in static files (configs, scripts)
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COPY deploy/kicbase/10-network-security.conf /etc/sysctl.d/10-network-security.conf
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COPY deploy/kicbase/11-tcp-mtu-probing.conf /etc/sysctl.d/11-tcp-mtu-probing.conf
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COPY deploy/kicbase/clean-install /usr/local/bin/clean-install
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COPY deploy/kicbase/entrypoint /usr/local/bin/entrypoint
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COPY --from=0 /src/cmd/auto-pause/auto-pause /bin/auto-pause
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# Install dependencies, first from apt, then from release tarballs.
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# NOTE: we use one RUN to minimize layers.
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#
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# First we must ensure that our util scripts are executable.
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#
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# The base image already has: ssh, apt, snapd, but we need to install more packages.
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# Packages installed are broken down into (each on a line):
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# - packages needed to run services (systemd)
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# - packages needed for kubernetes components
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# - packages needed by the container runtime
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# - misc packages kind uses itself
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# - packages that provide semi-core kubernetes functionality
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# After installing packages we cleanup by:
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# - removing unwanted systemd services
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# - disabling kmsg in journald (these log entries would be confusing)
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#
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# Next we ensure the /etc/kubernetes/manifests directory exists. Normally
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# a kubeadm debian / rpm package would ensure that this exists but we install
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# freshly built binaries directly when we build the node image.
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#
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# Finally we adjust tempfiles cleanup to be 1 minute after "boot" instead of 15m
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# This is plenty after we've done initial setup for a node, but before we are
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# likely to try to export logs etc.
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RUN echo "Ensuring scripts are executable ..." \
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&& chmod +x /usr/local/bin/clean-install /usr/local/bin/entrypoint \
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&& echo "Installing Packages ..." \
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&& DEBIAN_FRONTEND=noninteractive clean-install \
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systemd \
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conntrack iptables iproute2 ethtool socat util-linux mount ebtables udev kmod \
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libseccomp2 pigz \
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bash ca-certificates curl rsync \
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nfs-common \
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iputils-ping netcat-openbsd vim-tiny \
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&& find /lib/systemd/system/sysinit.target.wants/ -name "systemd-tmpfiles-setup.service" -delete \
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&& rm -f /lib/systemd/system/multi-user.target.wants/* \
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&& rm -f /etc/systemd/system/*.wants/* \
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&& rm -f /lib/systemd/system/local-fs.target.wants/* \
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&& rm -f /lib/systemd/system/sockets.target.wants/*udev* \
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&& rm -f /lib/systemd/system/sockets.target.wants/*initctl* \
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&& rm -f /lib/systemd/system/basic.target.wants/* \
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&& echo "ReadKMsg=no" >> /etc/systemd/journald.conf \
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&& ln -s "$(which systemd)" /sbin/init \
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&& echo "Ensuring /etc/kubernetes/manifests" \
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&& mkdir -p /etc/kubernetes/manifests \
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&& echo "Adjusting systemd-tmpfiles timer" \
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&& sed -i /usr/lib/systemd/system/systemd-tmpfiles-clean.timer -e 's#OnBootSec=.*#OnBootSec=1min#' \
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&& echo "Disabling udev" \
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&& systemctl disable udev.service \
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&& echo "Modifying /etc/nsswitch.conf to prefer hosts" \
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&& sed -i /etc/nsswitch.conf -re 's#^(hosts:\s*).*#\1dns files#'
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# tell systemd that it is in docker (it will check for the container env)
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# https://systemd.io/CONTAINER_INTERFACE/
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ENV container docker
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# systemd exits on SIGRTMIN+3, not SIGTERM (which re-executes it)
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# https://bugzilla.redhat.com/show_bug.cgi?id=1201657
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STOPSIGNAL SIGRTMIN+3
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# NOTE: this is *only* for documentation, the entrypoint is overridden later
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ENTRYPOINT [ "/usr/local/bin/entrypoint", "/sbin/init" ]
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ARG COMMIT_SHA
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# using base image created by kind https://github.com/kubernetes-sigs/kind/blob/b6bc1125/images/base/Dockerfile
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# available as a docker image: docker.io/kindest/base:v20210402-3d9112b0
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# which is an ubuntu 20.10 with an entry-point that helps running systemd
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# could be changed to any debian that can run systemd
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USER root
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# install system requirements from the regular distro repositories
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RUN clean-install \
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lz4 \
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gnupg \
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sudo \
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openssh-server \
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dnsutils \
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# libglib2.0-0 is required for conmon, which is required for podman
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libglib2.0-0
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# install docker
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RUN sh -c "echo 'deb https://download.docker.com/linux/ubuntu focal stable' > /etc/apt/sources.list.d/docker.list" && \
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curl -L https://download.docker.com/linux/ubuntu/gpg -o docker.key && \
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apt-key add - < docker.key && \
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clean-install docker-ce docker-ce-cli containerd.io
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# install buildkit
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RUN export ARCH=$(dpkg --print-architecture | sed 's/ppc64el/ppc64le/' | sed 's/armhf/arm-v7/') \
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&& echo "Installing buildkit ..." \
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&& export BUILDKIT_BASE_URL="https://github.com/moby/buildkit/releases/download/${BUILDKIT_VERSION}" \
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&& curl -sSL --retry 5 --output /tmp/buildkit.tgz "${BUILDKIT_BASE_URL}/buildkit-${BUILDKIT_VERSION}.linux-${ARCH}.tar.gz" \
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&& tar -C /usr/local -xzvf /tmp/buildkit.tgz \
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&& rm -rf /tmp/buildkit.tgz \
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&& chmod 755 /usr/local/bin/buildctl \
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&& chmod 755 /usr/local/bin/buildkit-runc \
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&& chmod 755 /usr/local/bin/buildkit-qemu-* \
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&& chmod 755 /usr/local/bin/buildkitd
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# Install cri-o/podman dependencies:
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RUN sh -c "echo 'deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_20.04/ /' > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list" && \
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curl -LO https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable/xUbuntu_20.04/Release.key && \
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apt-key add - < Release.key && \
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clean-install containers-common catatonit conmon containernetworking-plugins cri-tools podman-plugins crun
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# install cri-o based on https://github.com/cri-o/cri-o/blob/release-1.20/README.md#installing-cri-o
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RUN sh -c "echo 'deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/1.20/xUbuntu_20.04/ /' > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:1.20.list" && \
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curl -LO https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/1.20/xUbuntu_20.04/Release.key && \
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apt-key add - < Release.key && \
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clean-install cri-o cri-o-runc
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# install podman
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RUN sh -c "echo 'deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_20.04/ /' > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list" && \
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curl -LO https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable/xUbuntu_20.04/Release.key && \
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apt-key add - < Release.key && \
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clean-install podman && \
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addgroup --system podman && \
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mkdir -p /etc/systemd/system/podman.socket.d && \
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printf "[Socket]\nSocketMode=0660\nSocketUser=root\nSocketGroup=podman\n" \
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> /etc/systemd/system/podman.socket.d/override.conf && \
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mkdir -p /etc/tmpfiles.d && \
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echo "d /run/podman 0770 root podman" > /etc/tmpfiles.d/podman.conf && \
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systemd-tmpfiles --create
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# automount service
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COPY deploy/kicbase/automount/minikube-automount /usr/sbin/minikube-automount
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COPY deploy/kicbase/automount/minikube-automount.service /usr/lib/systemd/system/minikube-automount.service
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RUN ln -fs /usr/lib/systemd/system/minikube-automount.service \
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/etc/systemd/system/multi-user.target.wants/minikube-automount.service
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# scheduled stop service
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COPY deploy/kicbase/scheduled-stop/minikube-scheduled-stop /var/lib/minikube/scheduled-stop/minikube-scheduled-stop
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COPY deploy/kicbase/scheduled-stop/minikube-scheduled-stop.service /usr/lib/systemd/system/minikube-scheduled-stop.service
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RUN chmod +x /var/lib/minikube/scheduled-stop/minikube-scheduled-stop
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# disable non-docker runtimes by default
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RUN systemctl disable containerd && systemctl disable crio && rm /etc/crictl.yaml
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# enable docker which is default
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RUN systemctl enable docker.service && systemctl enable podman.socket
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# making SSH work for docker container
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# based on https://github.com/rastasheep/ubuntu-sshd/blob/master/18.04/Dockerfile
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RUN mkdir /var/run/sshd
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RUN echo 'root:root' |chpasswd
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RUN sed -ri 's/^#?PermitRootLogin\s+.*/PermitRootLogin yes/' /etc/ssh/sshd_config
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RUN sed -ri 's/UsePAM yes/#UsePAM yes/g' /etc/ssh/sshd_config
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# minikube relies on /etc/hosts for control-plane discovery. This prevents nefarious DNS servers from breaking it.
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RUN sed -ri 's/dns files/files dns/g' /etc/nsswitch.conf
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# metacopy breaks crio on certain OS and isn't necessary for minikube
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# https://github.com/kubernetes/minikube/issues/10520
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RUN sed -ri 's/mountopt = "nodev,metacopy=on"/mountopt = "nodev"/g' /etc/containers/storage.conf
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EXPOSE 22
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# create docker user for minikube ssh. to match VM using "docker" as username
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RUN adduser --ingroup docker --disabled-password --gecos '' docker
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RUN adduser docker sudo
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RUN adduser docker podman
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RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
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USER docker
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RUN mkdir /home/docker/.ssh
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USER root
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# kind base-image entry-point expects a "kind" folder for product_name,product_uuid
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# https://github.com/kubernetes-sigs/kind/blob/master/images/base/files/usr/local/bin/entrypoint
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RUN mkdir -p /kind
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# Deleting leftovers
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RUN rm -rf \
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/usr/share/doc/* \
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/usr/share/man/* \
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/usr/share/local/*
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RUN echo "kic! Build: ${COMMIT_SHA} Time :$(date)" > "/kic.txt"
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