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Allow running MPI applications as non-root
Adds the spec field sshAuthMountPath for MPIJob. The init script sets the permissions an ownership based on the securityContext of the launcherPod Adds a pure-MPI example to show how to create and use an image as non-root
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| FROM debian:buster | ||
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| RUN apt update && apt install -y --no-install-recommends \ | ||
| build-essential \ | ||
| libopenmpi-dev \ | ||
| openmpi-bin \ | ||
| openssh-server \ | ||
| openssh-client \ | ||
| && rm -rf /var/lib/apt/lists/* | ||
| # Add priviledge separation directoy to run sshd as root. | ||
| RUN mkdir -p /var/run/sshd | ||
| # Add capability to run sshd as non-root. | ||
| RUN setcap CAP_NET_BIND_SERVICE=+eip /usr/sbin/sshd | ||
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| RUN useradd -m mpiuser | ||
| WORKDIR /home/mpiuser | ||
| COPY --chown=mpiuser sshd_config .sshd_config | ||
| RUN cat /etc/ssh/ssh_config | grep -Ev 'StrictHostKeyChecking' > /etc/ssh/ssh_config.new && \ | ||
| echo " StrictHostKeyChecking no" >> /etc/ssh/ssh_config.new && \ | ||
| mv /etc/ssh/ssh_config.new /etc/ssh/ssh_config | ||
| COPY pi.cc /src/pi.cc | ||
| RUN mpic++ /src/pi.cc -o /home/mpiuser/pi |
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| # Pure MPI example | ||
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| This example shows to run a pure MPI application. | ||
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| The program prints some basic information about the workers. | ||
| Then, it calculates an approximate value for pi. | ||
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| ## How to build Image | ||
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| ```bash | ||
| docker build -t mpi-pi . | ||
| ``` | ||
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| ## Create MPIJob | ||
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| Modify `pi.yaml` to set up the image name from your own registry. | ||
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| Then, run: | ||
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| ``` | ||
| kubectl create -f pi.yaml | ||
| ``` | ||
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| The YAML shows how to run the binaries as a non-root user. |
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| // Copyright 2021 The Kubeflow Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #include "mpi.h" | ||
| #include <random> | ||
| #include <cstdio> | ||
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| int main(int argc, char *argv[]) { | ||
| int rank, workers, proc_name_size; | ||
| MPI_Init(&argc, &argv); | ||
| MPI_Comm_rank(MPI_COMM_WORLD, &rank); | ||
| MPI_Comm_size(MPI_COMM_WORLD, &workers); | ||
| if (rank == 0) { | ||
| printf("Workers: %d\n", workers); | ||
| } | ||
| char hostname[MPI_MAX_PROCESSOR_NAME]; | ||
| MPI_Get_processor_name(hostname, &proc_name_size); | ||
| printf("Rank %d on host %s\n", rank, hostname); | ||
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| std::minstd_rand generator(rank); | ||
| std::uniform_real_distribution<double> distribution(-1.0, 1.0); | ||
| double x, y; | ||
| long long worker_count = 0; | ||
| int worker_tests = 100000000; | ||
| for (int i = 0; i < worker_tests; i++) { | ||
| x = distribution(generator); | ||
| y = distribution(generator); | ||
| if (x * x + y * y <= 1.0) { | ||
| worker_count++; | ||
| } | ||
| } | ||
| long long total_count = 0; | ||
| MPI_Reduce(&worker_count, &total_count, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD); | ||
| if (rank == 0) { | ||
| double pi = 4 * (double)total_count / (double)(worker_tests) / (double)(workers); | ||
| printf("pi is approximately %.16lf\n", pi); | ||
| } | ||
| MPI_Finalize(); | ||
| return 0; | ||
| } |
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| apiVersion: kubeflow.org/v2 | ||
| kind: MPIJob | ||
| metadata: | ||
| name: pi | ||
| spec: | ||
| slotsPerWorker: 1 | ||
| cleanPodPolicy: Running | ||
| sshAuthMountPath: /home/mpiuser/.ssh | ||
| mpiReplicaSpecs: | ||
| Launcher: | ||
| replicas: 1 | ||
| template: | ||
| spec: | ||
| containers: | ||
| - image: docker.io/kubeflow/mpi-pi | ||
| name: mpi-launcher | ||
| securityContext: | ||
| runAsUser: 1000 | ||
| command: | ||
| - mpirun | ||
| args: | ||
| - -np | ||
| - "2" | ||
| - /home/mpiuser/pi | ||
| resources: | ||
| limits: | ||
| cpu: 1 | ||
| memory: 2Gi | ||
| Worker: | ||
| replicas: 2 | ||
| template: | ||
| spec: | ||
| containers: | ||
| - image: docker.io/kubeflow/mpi-pi | ||
| name: mpi-worker | ||
| securityContext: | ||
| runAsUser: 1000 | ||
| capabilities: | ||
| add: | ||
| - NET_BIND_SERVICE | ||
| command: | ||
| - /usr/sbin/sshd | ||
| args: | ||
| - -De | ||
| - -f | ||
| - /home/mpiuser/.sshd_config | ||
| resources: | ||
| limits: | ||
| cpu: 2 | ||
| memory: 4Gi |
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| PidFile /home/mpiuser/sshd.pid | ||
| HostKey /home/mpiuser/.ssh/id_rsa |
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