66 lines
1.8 KiB
Plaintext
66 lines
1.8 KiB
Plaintext
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#!/bin/bash
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install() {
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# Install needed software once
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sudo apt -y install docker.io
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sudo groupadd docker
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sudo usermod -aG docker $USER
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# Logout and login if you were not in group 'docker' before
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docker run hello-world
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}
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setup() {
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# Configure the virtual servers
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mkdir -p my-ubuntu/ ssh/
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cp ~/.ssh/id_rsa.pub ssh/
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cat ssh/*.pub > my-ubuntu/authorized_keys
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cat >my-ubuntu/Dockerfile <<EOF
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FROM ubuntu:bionic
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RUN apt update && \
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apt install -y openssh-server
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RUN mkdir /root/.ssh
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COPY authorized_keys /root/.ssh/authorized_keys
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# run blocking command which prevents container to exit immediately after start.
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CMD service ssh start && tail -f /dev/null
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EOF
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docker build my-ubuntu -t my-ubuntu
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}
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start() {
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testssh() {
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ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null root@"$1" echo "'$1'" '`uptime`'
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}
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export -f testssh
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# Start the virtual servers
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seq 100 |
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parallel -j0 'docker run -d --rm --name my-ubuntu-{} my-ubuntu; docker inspect my-ubuntu-{}' |
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# After this it is possible to do:
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# ssh 10.0.0.99
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# from another physical server
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perl -nE '/"IPAddress": "(\S+)"/ and not $seen{$1}++ and say $1' |
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parallel testssh
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docker ps
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}
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stop() {
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# Stop the virtual servers
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# After there is no running processes on the host server
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# and after this it is no longer possible to do:
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# ssh 10.0.0.99
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# from another physical server
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# The host server returns to the state before running `start`
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seq 100 | parallel -j0 docker stop my-ubuntu-{}
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docker ps
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}
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destroy() {
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# Remove the setup
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# After this the host server returns to the state before running `setup`
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rm -rf my-ubuntu/
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docker rmi my-ubuntu
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}
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full() {
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install
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setup
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start
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stop
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destroy
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}
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