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lab docs
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doc index
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<title>Docs on SwarmLab.io !</title>
lab docs
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</head>
<body class="article toc2 toc-right">
<div id="header">
doc index
4 years ago
<h1>Docs on SwarmLab.io !</h1>
lab docs
4 years ago
<div class="details">
<span id="author" class="author">Apostolos rootApostolos@swarmlab.io</span><br>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Πίνακας περιεχομένων</div>
<ul class="sectlevel1">
doc index
4 years ago
<li><a href="#_prepare_your_development_and_test_environment">1. Prepare your development and test environment</a>
lab docs
4 years ago
<ul class="sectlevel2">
git
4 years ago
<li><a href="#_docker">1.1. Docker</a>
faq
4 years ago
<ul class="sectlevel3">
git
4 years ago
<li><a href="#_install_docker">1.1.1. Install docker</a></li>
<li><a href="#_get_swarmlab_io_certificates">1.1.2. Get swarmlab.io certificates</a></li>
faq
4 years ago
</ul>
</li>
github
4 years ago
<li><a href="#_swarmlab_hybrid">1.2. Swarmlab-hybrid</a>
git
4 years ago
<ul class="sectlevel3">
github
4 years ago
<li><a href="#_install_swarmlab_hybrid">1.2.1. Install swarmlab-hybrid</a></li>
</ul>
</li>
<li><a href="#_linux">1.3. LINUX</a>
<ul class="sectlevel3">
<li><a href="#_install_dual">1.3.1. Install dual</a></li>
git
4 years ago
</ul>
</li>
lab docs
4 years ago
</ul>
</li>
git
4 years ago
<li><a href="#_linux_2">2. LINUX</a>
sec docs
4 years ago
<ul class="sectlevel2">
ls doc
4 years ago
<li><a href="#_an_introduction_to_linux">2.1. An Introduction to Linux</a></li>
vim procfs index
4 years ago
<li><a href="#_the_proc_filesystem">2.2. The proc filesystem</a></li>
<li><a href="#_vim_a_simple_workflow_example_with_the_vim_editor">2.3. VIM - A simple workflow example with the vim editor</a></li>
array
4 years ago
<li><a href="#_bash_associative_array_examples">2.4. Bash - Associative array examples</a></li>
arr
4 years ago
<li><a href="#_bash_heredocs_positional_parameters">2.5. Bash - Heredocs, Positional Parameters</a></li>
doc index
4 years ago
</ul>
</li>
ls doc
4 years ago
<li><a href="#_internet_of_things_iot">3. Internet of things (IoT)</a>
doc index
4 years ago
<ul class="sectlevel2">
ls doc
4 years ago
<li><a href="#_intro_iot">3.1. Intro IoT</a></li>
iot swarm
4 years ago
<li><a href="#_iot_swarm_implementation">3.2. IoT swarm implementation</a></li>
html
4 years ago
<li><a href="#_create_a_mote_with_raspberry_piarduino">3.3. Create a mote with Raspberry Pi/Arduino</a></li>
<li><a href="#_sensor_nodemote">3.4. Sensor node/mote</a></li>
ls doc
4 years ago
</ul>
</li>
<li><a href="#_security">4. Security</a>
<ul class="sectlevel2">
create swarmlab cluster
4 years ago
<li><a href="#_create_swarmlab_cluster">4.1. Create Swarmlab cluster</a></li>
create cluster
4 years ago
<li><a href="#_scan_and_network_statistics">4.2. Scan and network statistics</a></li>
<li><a href="#_network_analysis">4.3. Network analysis</a></li>
<li><a href="#_network_filter">4.4. Network Filter</a>
doc index
4 years ago
<ul class="sectlevel3">
create cluster
4 years ago
<li><a href="#_traversing_of_tables_and_chains">4.4.1. Traversing of tables and chains</a></li>
doc index
4 years ago
</ul>
</li>
create cluster
4 years ago
<li><a href="#_iptables_with_shorewall_three_interface_firewall">4.5. Iptables with shorewall! - Three-Interface Firewall</a></li>
<li><a href="#_virtual_private_network_vpn">4.6. virtual private network (VPN)</a></li>
<li><a href="#_ssh_tunneling">4.7. SSH Tunneling</a></li>
sec docs
4 years ago
</ul>
</li>
add cloud
4 years ago
<li><a href="#_cloud">5. Cloud</a>
<ul class="sectlevel2">
<li><a href="#_cloud_computing">5.1. Cloud computing</a></li>
<li><a href="#_swarm_architecture">5.2. Swarm architecture</a></li>
add architecture
4 years ago
<li><a href="#_swarm_architecture_example">5.3. Swarm architecture example</a></li>
<li><a href="#_swarm_storage_intro">5.4. Swarm Storage - INTRO</a></li>
<li><a href="#_swarm_storage_config">5.5. Swarm Storage - CONFIG</a></li>
<li><a href="#_swarm_storage_install">5.6. Swarm Storage - INSTALL</a></li>
add cloud
4 years ago
</ul>
</li>
git
4 years ago
<li><a href="#_git">6. Git</a>
<ul class="sectlevel2">
<li><a href="#_intro">6.1. Intro</a></li>
<li><a href="#_basics">6.2. Basics</a></li>
<li><a href="#_history">6.3. History</a></li>
github
4 years ago
<li><a href="#_account_setup">6.4. Account setup</a></li>
git
4 years ago
</ul>
</li>
<li><a href="#_frequently_asked_questions">7. Frequently Asked Questions</a></li>
<li><a href="#_how_do_i_ask_a_good_question">8. How do I ask a good question?</a></li>
lab docs
4 years ago
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
lab docs 1
4 years ago
<div class="paragraph">
lab docs
4 years ago
<p><br></p>
</div>
doc index
4 years ago
<div class="sidebarblock">
<div class="content">
<div class="title">Lab docs</div>
lab docs
4 years ago
<div class="paragraph">
doc index
4 years ago
<p><strong>Internet of Things</strong>. Is as a networked interconnection of devices in everyday use that are often equippedwith ubiquitous mechanism.</p>
doc index
4 years ago
</div>
<div class="paragraph">
doc index
4 years ago
<p><strong>Security</strong>. Is a set of mechanisms to protect sensitive data from vulnerable attacks and to guaranteeconfidentiality, integrity and authenticity of data.</p>
doc index
4 years ago
</div>
</div>
lab docs
4 years ago
</div>
doc index
4 years ago
<div class="paragraph">
<p><br>
</p>
</div>
lab docs
4 years ago
</div>
</div>
<div class="sect1">
doc index
4 years ago
<h2 id="_prepare_your_development_and_test_environment">1. Prepare your development and test environment</h2>
lab docs
4 years ago
<div class="sectionbody">
<div class="sect2">
git
4 years ago
<h3 id="_docker">1.1. Docker</h3>
<div class="sect3">
<h4 id="_install_docker">1.1.1. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/Howtos/docker/install.adoc.html" target="_blank" rel="noopener">Install docker</a></h4>
doc index
4 years ago
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
doc index
4 years ago
<div class="paragraph">
<p><strong>Docker</strong> is a set of platform as a service (PaaS) products that use OS-level virtualization to deliver software in packages called containers.</p>
</div>
<div class="paragraph">
<p>Containers are isolated from one another and bundle their own software, libraries and configuration files; they can communicate with each other through well-defined channels</p>
</div>
doc index
4 years ago
</td>
</tr>
</table>
</div>
vim procfs index 1
4 years ago
</div>
git
4 years ago
<div class="sect3">
git
4 years ago
<h4 id="_get_swarmlab_io_certificates">1.1.2. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/Howtos/docker/install.adoc.html#_get_https_registry_vlabs_uniwa_gr5080v2_x509_certificate" target="_blank" rel="noopener">Get swarmlab.io certificates</a></h4>
git
4 years ago
</div>
</div>
git
4 years ago
<div class="sect2">
github
4 years ago
<h3 id="_swarmlab_hybrid">1.2. Swarmlab-hybrid</h3>
<div class="sect3">
<h4 id="_install_swarmlab_hybrid">1.2.1. <a href="https://git.swarmlab.io:3000/zeus/swarmlab-hybrid" target="_blank" rel="noopener">Install swarmlab-hybrid</a></h4>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p><strong>Swarmlab-hybrid</strong> provides On demand Labrooms</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_linux">1.3. LINUX</h3>
git
4 years ago
<div class="sect3">
github
4 years ago
<h4 id="_install_dual">1.3.1. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/Howtos/installdual/install.adoc.html" target="_blank" rel="noopener">Install dual</a></h4>
doc index
4 years ago
<div class="paragraph">
<p><br>
<br>
</p>
</div>
doc index
4 years ago
</div>
</div>
</div>
git
4 years ago
</div>
doc index
4 years ago
<div class="sect1">
git
4 years ago
<h2 id="_linux_2">2. LINUX</h2>
ls doc
4 years ago
<div class="sectionbody">
<div class="sect2">
<h3 id="_an_introduction_to_linux">2.1. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/ls/ex-1_ls.adoc.html" target="_blank" rel="noopener">An Introduction to Linux</a></h3>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
Absolute basics
</td>
</tr>
</table>
</div>
vim procfs index
4 years ago
</div>
<div class="sect2">
<h3 id="_the_proc_filesystem">2.2. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/ls/procfs.adoc.html" target="_blank" rel="noopener">The proc filesystem</a></h3>
</div>
<div class="sect2">
<h3 id="_vim_a_simple_workflow_example_with_the_vim_editor">2.3. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/ls/vim.adoc.html" target="_blank" rel="noopener">VIM - A simple workflow example with the vim editor</a></h3>
array
4 years ago
</div>
<div class="sect2">
<h3 id="_bash_associative_array_examples">2.4. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/ls/array-1_ls.adoc.html" target="_blank" rel="noopener">Bash - Associative array examples</a></h3>
</div>
<div class="sect2">
arr
4 years ago
<h3 id="_bash_heredocs_positional_parameters">2.5. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/ls/heredocs_ls.adoc.html" target="_blank" rel="noopener">Bash - Heredocs, Positional Parameters</a></h3>
ls doc
4 years ago
<div class="paragraph">
<p><br>
<br>
</p>
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<div class="sect1">
<h2 id="_internet_of_things_iot">3. Internet of things (IoT)</h2>
doc index
4 years ago
<div class="sectionbody">
<div class="sect2">
ls doc
4 years ago
<h3 id="_intro_iot">3.1. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/IoT/Intro-IoT.adoc.html" target="_blank" rel="noopener">Intro IoT</a></h3>
lab docs 1
4 years ago
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How It Works, Apps, Swarm: The Five Principles of Swarm Intelligence
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</table>
</div>
iot swarm
4 years ago
</div>
<div class="sect2">
<h3 id="_iot_swarm_implementation">3.2. IoT swarm implementation</h3>
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<p>A swarm implementation that will allow communication between all of the members/nodes.</p>
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<ul>
<li>
<p><a href="https://git.swarmlab.io:3000/zeus/iot-swarm-example/src/branch/master" target="_blank" rel="noopener">source code</a></p>
</li>
<li>
<p><a href="https://git.swarmlab.io:3000/zeus/iot-swarm-example/raw/branch/master/docs/README.adoc" target="_blank" rel="noopener">info in adoc</a></p>
</li>
<li>
<p><a href="https://git.swarmlab.io:3000/zeus/iot-swarm-example/raw/branch/master/docs/README.adoc.pdf" target="_blank" rel="noopener">info in pdf</a></p>
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html
4 years ago
</div>
<div class="sect2">
<h3 id="_create_a_mote_with_raspberry_piarduino">3.3. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/IoT/SensorNode2Server.adoc.html" target="_blank" rel="noopener">Create a mote with Raspberry Pi/Arduino</a></h3>
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<p>The Raspberry Pi is a low-cost credit-card sized single-board computer. The Raspberry Pi was created in the UK by the Raspberry Pi Foundation. The Raspberry Pi Foundation’s goal is to "advance the education of adults and children, particularly in the field of computers, computer science and related subjects."</p>
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<div class="sect2">
<h3 id="_sensor_nodemote">3.4. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/IoT/SensorNode.adoc.html" target="_blank" rel="noopener">Sensor node/mote</a></h3>
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<p>A sensor node, also known as a mote, is a node in a sensor network that is capable of performing some processing, gathering sensory information and communicating with other connected nodes in the network.</p>
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doc index
4 years ago
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<p><br>
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</p>
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lab docs
4 years ago
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sec docs
4 years ago
<div class="sect1">
ls doc
4 years ago
<h2 id="_security">4. Security</h2>
sec docs
4 years ago
<div class="sectionbody">
doc index
4 years ago
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<p><strong>Security</strong> is defined as a set of mechanisms to protect sensitive data from vulnerable attacks and to guaranteeconfidentiality, integrity and authenticity of data.</p>
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<p><strong>Network security,</strong> in a cloud environment <strong>(IaaS, PaaS, and SaaS) OR Cloud of Things</strong> consists of the security of the underlying <strong>physical environment</strong> and the <strong>logical security</strong> controls that are inherent in the service or available to be consumed as a service.</p>
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<li>
<p>Physical environment security ensures access to the cloud service is adequately distributed, monitored, and protected by underlying physical resources.</p>
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<p>Logical network security controls consists of link, protocol, and application layer services.</p>
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<p>In a <strong>cloud environment</strong>, a major part of network security is likely to be provided by virtual security devices and services, alongside traditional physical network devices.</p>
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<p>Typically, the inspection and control of network traffic do not pass through physical interfaces where classical control devices can analyze or block them.</p>
</div>
<div class="paragraph">
<p>This is the reason why effective controls require the integration with the software layer - <em>network security architecture, security gateways (firewalls, WAF, SOA/API), Security Products (IDS/IPS, Sub Tier Firewall, Security Monitoring and Reporting, Denial of Service (DoS) protection/mitigation, and secure “base services” like DNSSEC and NTP</em>.</p>
</div>
</div>
</div>
sec docs
4 years ago
<div class="sect2">
create swarmlab cluster
4 years ago
<h3 id="_create_swarmlab_cluster">4.1. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/sec.adoc.html" target="_blank" rel="noopener">Create Swarmlab cluster</a></h3>
create cluster
4 years ago
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create swarmlab cluster
4 years ago
This tutorial describes how to create and set up swarmlab clusters
create cluster
4 years ago
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<div class="sect2">
<h3 id="_scan_and_network_statistics">4.2. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-1_iptables.adoc.html" target="_blank" rel="noopener">Scan and network statistics</a></h3>
sec docs
4 years ago
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doc index
4 years ago
This tutorial demonstrates some common <strong>nmap</strong> port scanning scenarios and explains the output.
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<div class="sect2">
create cluster
4 years ago
<h3 id="_network_analysis">4.3. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-2_iptables.adoc.html" target="_blank" rel="noopener">Network analysis</a></h3>
doc index
4 years ago
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<strong>tcpdump</strong> is a common packet analyzer that runs under the command line. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Distributed under the BSD license, tcpdump is free software.
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create cluster
4 years ago
<h3 id="_network_filter">4.4. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-3_iptables.adoc.html" target="_blank" rel="noopener">Network Filter</a></h3>
doc index
4 years ago
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<p>Netfilter offers various functions and operations for <strong>packet filtering</strong>, <strong>network address</strong> translation, and <strong>port translation</strong>, which provide the functionality required for <strong>directing packets</strong> through a network and <strong>prohibiting packets</strong> from reaching sensitive locations within a network.</p>
</div>
<div class="paragraph">
<p><strong>iptables</strong> is a command line utility for configuring Linux kernel firewall implemented within the Netfilter project. The term ''iptables'' is also commonly used to refer to this kernel-level firewall. It can be configured directly with iptables, or by using one of the many</p>
</div>
</td>
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</div>
<div class="sect3">
create cluster
4 years ago
<h4 id="_traversing_of_tables_and_chains">4.4.1. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-3a_iptables-flow-chart.adoc.html" target="_blank" rel="noopener">Traversing of tables and chains</a></h4>
doc index
4 years ago
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<p>When a packet first enters the firewall, it hits the hardware and then gets passed on to the proper device driver in the kernel.</p>
</div>
<div class="paragraph">
<p>Then the packet starts to <strong>go through a series of steps in the kernel</strong>, before it is either <strong>sent to the correct application</strong> (locally), or <strong>forwarded to another host</strong> - or whatever happens to i</p>
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<div class="sect2">
create cluster
4 years ago
<h3 id="_iptables_with_shorewall_three_interface_firewall">4.5. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-4_iptables.adoc.html" target="_blank" rel="noopener">Iptables with shorewall! - Three-Interface Firewall</a></h3>
doc index
4 years ago
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<p><strong>Shorewall</strong> is an open source firewall tool for Linux that builds <strong>upon the Netfilter (iptables/ipchains)</strong> system built into the Linux kernel, making it easier to manage more <strong>complex configuration schemes</strong> by providing a higher level of abstraction for describing rules using text files.</p>
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<div class="sect2">
create cluster
4 years ago
<h3 id="_virtual_private_network_vpn">4.6. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-5_iptables.adoc.html" target="_blank" rel="noopener">virtual private network (VPN)</a></h3>
doc index
4 years ago
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<p>A <strong>virtual private network (VPN)</strong> extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were <strong>directly connected to the private network</strong>.</p>
</div>
</td>
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<div class="sect2">
create cluster
4 years ago
<h3 id="_ssh_tunneling">4.7. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-6_iptables.adoc.html" target="_blank" rel="noopener">SSH Tunneling</a></h3>
doc index
4 years ago
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<p><strong>SSH Tunneling,</strong> is the ability to use ssh to <strong>create a bi-directional encrypted network connection</strong> between machines over which data can be exchanged, typically TCP/IP.</p>
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sec docs
4 years ago
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faq
4 years ago
</div>
</div>
<div class="sect1">
add cloud
4 years ago
<h2 id="_cloud">5. Cloud</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_cloud_computing">5.1. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/cloud/Intro-Cloud.adoc.html" target="_blank" rel="noopener">Cloud computing</a></h3>
</div>
<div class="sect2">
<h3 id="_swarm_architecture">5.2. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/cloud/Creaate-Swarm.adoc.html" target="_blank" rel="noopener">Swarm architecture</a></h3>
</div>
<div class="sect2">
add architecture
4 years ago
<h3 id="_swarm_architecture_example">5.3. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/course/architecture-microservice-swarmlab.adoc.html" target="_blank" rel="noopener">Swarm architecture example</a></h3>
add cloud
4 years ago
</div>
<div class="sect2">
add architecture
4 years ago
<h3 id="_swarm_storage_intro">5.4. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/cloud/swarm-volumes-storage.adoc.html" target="_blank" rel="noopener">Swarm Storage - INTRO</a></h3>
add cloud
4 years ago
</div>
<div class="sect2">
add architecture
4 years ago
<h3 id="_swarm_storage_config">5.5. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/cloud/swarm-volumes-minio-howto.adoc.html" target="_blank" rel="noopener">Swarm Storage - CONFIG</a></h3>
</div>
<div class="sect2">
<h3 id="_swarm_storage_install">5.6. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/cloud/swarm-volumes-storage-howto.adoc.html" target="_blank" rel="noopener">Swarm Storage - INSTALL</a></h3>
add cloud
4 years ago
</div>
</div>
</div>
<div class="sect1">
git
4 years ago
<h2 id="_git">6. Git</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_intro">6.1. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/git/intro.adoc.html" target="_blank" rel="noopener">Intro</a></h3>
</div>
<div class="sect2">
<h3 id="_basics">6.2. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/git/basics.adoc.html" target="_blank" rel="noopener">Basics</a></h3>
</div>
<div class="sect2">
<h3 id="_history">6.3. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/git/history.adoc.html" target="_blank" rel="noopener">History</a></h3>
github
4 years ago
</div>
<div class="sect2">
<h3 id="_account_setup">6.4. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/git/github.adoc.html" target="_blank" rel="noopener">Account setup</a></h3>
git
4 years ago
</div>
</div>
</div>
<div class="sect1">
<h2 id="_frequently_asked_questions">7. <a href="http://docs.swarmlab.io/SwarmLab-HowTos/labs/faqs/faq.adoc.html" target="_blank" rel="noopener">Frequently Asked Questions</a></h2>
faq
4 years ago
<div class="sectionbody">
faq
4 years ago
</div>
</div>
<div class="sect1">
git
4 years ago
<h2 id="_how_do_i_ask_a_good_question">8. How do I ask a good question?</h2>
faq
4 years ago
<div class="sectionbody">
faq
4 years ago
<div class="admonitionblock note">
faq
4 years ago
<table>
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faq
4 years ago
<i class="fa icon-note" title="Note"></i>
faq
4 years ago
</td>
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<ul>
<li>
<p>Introduce the problem before you post any code</p>
faq
4 years ago
</li>
<li>
<p>Help others reproduce the problem</p>
faq
4 years ago
<div class="literalblock">
<div class="content">
<pre>In the body of your question, start by expanding on the summary you put in the title.</pre>
</div>
</div>
<div class="literalblock">
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<pre>Explain how you encountered the problem you're trying to solve, and any difficulties that have prevented you from solving it yourself.</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
faq
4 years ago
<pre>The first paragraph in your question is the second thing most readers will see, so make it as engaging and informative as possible.</pre>
faq
4 years ago
</div>
</div>
</li>
</ul>
</div>
<div class="paragraph">
<p>Not all questions benefit from including code. But if your problem is with code you&#8217;ve written, you should include some. But don&#8217;t just copy in your entire program! Not only is this likely to get you in trouble if you&#8217;re posting your employer&#8217;s code, it likely includes a lot of irrelevant details that readers will need to ignore when trying to reproduce the problem. Here are some guidelines:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Include just enough code to allow others to reproduce the problem. For help with this, read How to create a Minimal, Complete, and Verifiable example.</p>
</li>
<li>
<p>If it is possible to create a live example of the problem that you can link to (for example, on <a href="http://sqlfiddle.com/" class="bare">http://sqlfiddle.com/</a> or <a href="http://jsbin.com/" class="bare">http://jsbin.com/</a>) then do so - but also copy the code into the question itself. Not everyone can access external sites, and the links may break over time. Use Stack Snippets to make a live demo of inline JavaScript / HTML / CSS.</p>
</li>
<li>
<p><strong>DO NOT post images of code</strong>, data, error messages, etc. - copy or type the text into the question. Please reserve the use of images for diagrams or demonstrating rendering bugs, things that are impossible to describe accurately via text. For more information please see the Meta FAQ entry Why not upload images of code/errors when asking a question?</p>
</li>
</ul>
</div>
</td>
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</table>
</div>
sec docs
4 years ago
</div>
</div>
lab docs
4 years ago
</div>
<div id="footer">
<div id="footer-text">
github
4 years ago
Last updated 2021-04-21 22:04:10 UTC
lab docs
4 years ago
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