Initial implementation

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diff --git a/README.md b/README.md
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-docker
-======
+Simple docker puppet module
+===========================
+
+It basically installs docker-ce package.

diff --git a/files/docker.gpg b/files/docker.gpg
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diff --git a/manifests/init.pp b/manifests/init.pp
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+# See https://linuxconfig.org/how-to-install-docker-on-debian-9-stretch-linux
+class docker {
+  $distro = downcase($::lsbdistid)
+
+  file { '/etc/apt/trusted.gpg.d/docker.gpg':
+    ensure => present,
+    mode   => '0644',
+    owner  => 'root',
+    group  => 'root',
+    source => 'puppet:///modules/docker/docker.gpg',
+  }
+
+  file { '/etc/apt/sources.list.d/docker.list' :
+    ensure  => present,
+    owner   => "root",
+    group   => "root",
+    mode    => "0644",
+    content => "deb [arch=amd64] https://download.docker.com/linux/${distro} ${::lsbdistcodename} stable\n",
+    require => File['/etc/apt/trusted.gpg.d/docker.gpg'],
+    notify  => Exec['docker-apt-auto-update'],
+  }
+
+  exec { 'docker-apt-auto-update':
+    command     => "/usr/bin/apt-get update",
+    user        => "root",
+    refreshonly => true,
+  }
+
+  package { 'docker-ce':
+    ensure  => present,
+    require => File['/etc/apt/sources.list.d/docker.list'],
+  }
+
+  service { 'docker' :
+    ensure    => running,
+    enable    => true,
+    require   => Package['docker-ce'],
+  }
+}