Install `promtail`.

cookbooks/promtail/install.rb

@@ -0,0 +1,55 @@
+promtail_url = ''
+promtail_bin = ''
+
+tag               = ''
+vtag              = ''
+
+# Calculate the Download URL:
+begin
+  require 'net/http'
+
+  uri = URI.parse('https://github.com/grafana/loki/releases/latest')
+
+  Timeout.timeout(3) do
+    response = Net::HTTP.get_response(uri)
+
+    vtag = $1 if response.body =~ %r{tag\/(v\d+\.\d+\.\d+)}
+    tag = vtag.sub(/^v/, '')
+
+    promtail_url = "#{node['promtail']['url']}/#{vtag}/#{node['promtail']['bin']}"
+  end
+rescue
+  # Abort the chef client process:
+  raise 'Cannot connect to http://github.com.'
+end
+
+# バージョン確認して、アップデート必要かどうか確認
+result = run_command("promtail --version 2>&1 | grep #{tag}", error: false)
+if result.exit_status != 0
+  # Download:
+  TMP = "/tmp/#{node['promtail']['bin']}"
+
+  execute "wget #{promtail_url} -O #{TMP}"
+
+  # Install:
+  directory node['promtail']['storage'] do
+    owner 'root'
+    group 'root'
+    mode '755'
+  end
+
+  execute "unzip #{TMP} -d #{node['promtail']['storage']}"
+  execute "mv #{node['promtail']['storage']}promtail-linux-amd64 #{node['promtail']['storage']}promtail"
+
+  # Change Owner and Permissions:
+  file "#{node['promtail']['storage']}promtail" do
+    owner 'root'
+    group 'root'
+    mode  '755'
+  end
+
+  # Create Link
+  link "#{node['promtail']['location']}promtail" do
+    to "#{node['promtail']['storage']}promtail"
+  end
+end