update FAQ
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faq.html
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faq.html
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@ -218,11 +218,11 @@ that Func didn’t have.</p>
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<h3>vs Puppet?<a class="headerlink" href="#vs-puppet" title="Permalink to this headline">¶</a></h3>
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<p>First off, Ansible wouldn’t have happened without Puppet. Puppet took configuration
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management ideas from cfengine and made them sane. However, I still think they can
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be simpler.</p>
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be much simpler.</p>
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<p>Ansible playbooks ARE a complete configuration management system. Unlike Puppet, playbooks
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are implicitly ordered (more like Chef), but still retain the ability to signal
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notification events (like Puppet). This is kind of a ‘best of both worlds’ thing.</p>
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<p>There is no central server to promote scaling, and Ansible is
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<p>There is no central server subject to thundering herd problems, and Ansible is
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also designed with multi-node deployment in mind from day-one – something that is difficult
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for Puppet because of the pull architecture. Ansible is push based,
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so you can do things in an ordered fashion, addressing batches of servers
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@ -238,11 +238,9 @@ other systems that depend on that system.</p>
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<p>Ansible also has a VERY short learning curve – but it also has less language constructs and
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does not create its own programming language. What constructs Ansible does have should be enough to cover 80% or so of the cases of most Puppet users, and it should scale equally well (not having a server is
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almost like cheating).</p>
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<p>I also suspect some Ansible users will actually use Ansible to trigger Puppet – using the git
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module to checkout a Puppet module hierachy from source, and the command module to run
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‘puppet apply’. That’s ok too, but you may find playbooks do all you need.</p>
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<p>Ansible does support gathering variables from ‘facter’, if installed, and Ansible templates
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in jinja2 in a way just like Puppet does with erb.</p>
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in jinja2 in a way just like Puppet does with erb. Ansible in version 0.3 will have it’s own facts,
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however, so it will not need to rely on facter, but can use it if available.</p>
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</div>
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<div class="section" id="vs-chef">
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<h3>vs Chef?<a class="headerlink" href="#vs-chef" title="Permalink to this headline">¶</a></h3>
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@ -262,10 +260,9 @@ Chef and Puppet are around 60k+ lines of code, while Ansible is a much simpler
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program. I believe this strongly leads to more reliable software and a richer
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open source community – the code is kept simple so it is easy for anyone to
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submit a patch or module.</p>
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<p>Just like with puppet, some users may wish to use Ansible to trigger chef-solo to
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avoid using the server, after checking out some chef content using Ansible’s git
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support.</p>
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<p>Ansible does support gathering variables from ‘ohai’, if installed.</p>
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<p>Ansible does support gathering variables from ‘ohai’, if installed. As of release
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0.3, Ansible will also have it’s own facts system so you will not need to use ohai
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or facter (or have a dependency on Ruby).</p>
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</div>
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<div class="section" id="vs-capistrano-fabric">
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<h3>vs Capistrano/Fabric?<a class="headerlink" href="#vs-capistrano-fabric" title="Permalink to this headline">¶</a></h3>
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@ -273,7 +270,8 @@ support.</p>
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typically about pushing software out for web deployment and automating steps.</p>
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<p>Meanwhile Ansible is designed for other types of configuration management, and contains some
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advanced scaling features.</p>
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<p>The ansible playbook syntax is documented within a page of text and also has a MUCH lower learning curve. And because Ansible is designed for more than pushing webapps, it’s more generally
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<p>The ansible playbook syntax is documented within one HTML page and also has a MUCH lower learning curve.
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And because Ansible is designed for more than pushing webapps, it’s more generally
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useful for sysadmins (not just web developers), and can also be used for firing off ad-hoc tasks.</p>
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</div>
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</div>
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@ -281,7 +279,7 @@ useful for sysadmins (not just web developers), and can also be used for firing
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<h2>Other Questions<a class="headerlink" href="#other-questions" title="Permalink to this headline">¶</a></h2>
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<div class="section" id="what-is-ansible-s-approach-to-security">
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<h3>What is Ansible’s approach to security?<a class="headerlink" href="#what-is-ansible-s-approach-to-security" title="Permalink to this headline">¶</a></h3>
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<p>Ansible aims to not develop custom daemon code but rely heavily on OpenSSH, which is extremely well
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<p>Ansible aims to not develop custom daemon or PKI code but rely heavily on OpenSSH, which is extremely well
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peer reviewed and the most widely used security subsystem in the industry. As a result, Ansible
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has a lower attack surface than any configuration management tool featuring daemons that run
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as root, and you do not have to worry about network security vulnerabilities in the tool itself.</p>
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@ -307,14 +305,17 @@ is about handling those kinds of use cases.</p>
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Ansible, it is not consuming any resources.</p>
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<p>If you have 10,000 systems, running a single ansible playbook against all of
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them probably isn’t always appropriate, but most users shouldn’t have any problems.
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If you want to kick off an async task/module, it’s probably fine.</p>
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If you want to kick off an async task/module, it’s probably fine. We also
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support a local connection mode (–connection=local) that will enable pull
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based usage for those that want that. Look for future features in this area.</p>
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<p>If you’d like to discuss scaling, please hop on the mailing list.</p>
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</div>
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<div class="section" id="are-transports-other-than-ssh-supported">
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<h3>Are transports other than SSH supported?<a class="headerlink" href="#are-transports-other-than-ssh-supported" title="Permalink to this headline">¶</a></h3>
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<p>Currently SSH is the only transport, though the interface is pluggable so a
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<p>Currently SSH is the only remote transport, though the interface is pluggable so a
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small patch could bring transport over message bus or XMPP as an option.
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Stop by the mailing list if you have ideas.</p>
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Stop by the mailing list if you have ideas. The connection-specific parts of Ansible
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are all abstracted away from the core implementation so it is very easy to extend.</p>
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</div>
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<div class="section" id="what-are-some-ideal-uses-for-ansible">
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<h3>What are some ideal uses for Ansible?<a class="headerlink" href="#what-are-some-ideal-uses-for-ansible" title="Permalink to this headline">¶</a></h3>
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33
rst/faq.rst
33
rst/faq.rst
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@ -60,13 +60,13 @@ vs Puppet?
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First off, Ansible wouldn't have happened without Puppet. Puppet took configuration
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management ideas from cfengine and made them sane. However, I still think they can
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be simpler.
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be much simpler.
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Ansible playbooks ARE a complete configuration management system. Unlike Puppet, playbooks
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are implicitly ordered (more like Chef), but still retain the ability to signal
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notification events (like Puppet). This is kind of a 'best of both worlds' thing.
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There is no central server to promote scaling, and Ansible is
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There is no central server subject to thundering herd problems, and Ansible is
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also designed with multi-node deployment in mind from day-one -- something that is difficult
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for Puppet because of the pull architecture. Ansible is push based,
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so you can do things in an ordered fashion, addressing batches of servers
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@ -86,12 +86,9 @@ Ansible also has a VERY short learning curve -- but it also has less language co
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does not create its own programming language. What constructs Ansible does have should be enough to cover 80% or so of the cases of most Puppet users, and it should scale equally well (not having a server is
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almost like cheating).
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I also suspect some Ansible users will actually use Ansible to trigger Puppet -- using the git
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module to checkout a Puppet module hierachy from source, and the command module to run
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'puppet apply'. That's ok too, but you may find playbooks do all you need.
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Ansible does support gathering variables from 'facter', if installed, and Ansible templates
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in jinja2 in a way just like Puppet does with erb.
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in jinja2 in a way just like Puppet does with erb. Ansible in version 0.3 will have it's own facts,
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however, so it will not need to rely on facter, but can use it if available.
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vs Chef?
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++++++++
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@ -116,11 +113,9 @@ program. I believe this strongly leads to more reliable software and a richer
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open source community -- the code is kept simple so it is easy for anyone to
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submit a patch or module.
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Just like with puppet, some users may wish to use Ansible to trigger chef-solo to
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avoid using the server, after checking out some chef content using Ansible's git
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support.
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Ansible does support gathering variables from 'ohai', if installed.
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Ansible does support gathering variables from 'ohai', if installed. As of release
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0.3, Ansible will also have it's own facts system so you will not need to use ohai
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or facter (or have a dependency on Ruby).
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vs Capistrano/Fabric?
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+++++++++++++++++++++
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@ -131,7 +126,8 @@ typically about pushing software out for web deployment and automating steps.
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Meanwhile Ansible is designed for other types of configuration management, and contains some
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advanced scaling features.
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The ansible playbook syntax is documented within a page of text and also has a MUCH lower learning curve. And because Ansible is designed for more than pushing webapps, it's more generally
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The ansible playbook syntax is documented within one HTML page and also has a MUCH lower learning curve.
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And because Ansible is designed for more than pushing webapps, it's more generally
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useful for sysadmins (not just web developers), and can also be used for firing off ad-hoc tasks.
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Other Questions
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@ -140,7 +136,7 @@ Other Questions
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What is Ansible's approach to security?
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+++++++++++++++++++++++++++++++++++++++
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Ansible aims to not develop custom daemon code but rely heavily on OpenSSH, which is extremely well
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Ansible aims to not develop custom daemon or PKI code but rely heavily on OpenSSH, which is extremely well
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peer reviewed and the most widely used security subsystem in the industry. As a result, Ansible
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has a lower attack surface than any configuration management tool featuring daemons that run
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as root, and you do not have to worry about network security vulnerabilities in the tool itself.
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@ -172,16 +168,19 @@ Ansible, it is not consuming any resources.
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If you have 10,000 systems, running a single ansible playbook against all of
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them probably isn't always appropriate, but most users shouldn't have any problems.
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If you want to kick off an async task/module, it's probably fine.
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If you want to kick off an async task/module, it's probably fine. We also
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support a local connection mode (--connection=local) that will enable pull
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based usage for those that want that. Look for future features in this area.
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If you'd like to discuss scaling, please hop on the mailing list.
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Are transports other than SSH supported?
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++++++++++++++++++++++++++++++++++++++++
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Currently SSH is the only transport, though the interface is pluggable so a
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Currently SSH is the only remote transport, though the interface is pluggable so a
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small patch could bring transport over message bus or XMPP as an option.
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Stop by the mailing list if you have ideas.
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Stop by the mailing list if you have ideas. The connection-specific parts of Ansible
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are all abstracted away from the core implementation so it is very easy to extend.
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What are some ideal uses for Ansible?
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+++++++++++++++++++++++++++++++++++++
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|
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