Install & Setup `Loki`.

cookbooks/loki/attributes.rb

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+# -------------------------------------------
+# Specifying the default settings:
+# -------------------------------------------
+node.reverse_merge!({
+  'loki' => {
+    'url' => 'https://github.com/grafana/loki/releases/download/',
+    'zip' => 'loki-linux-amd64.zip',
+    'storage' => '/opt/loki/',
+    'location' => '/usr/local/bin/'
+  },
+})

cookbooks/loki/default.rb

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+# Loading the attributes:
+include_recipe './attributes.rb'
+
+# Install loki here:
+include_recipe './install.rb'
+include_recipe './setup.rb'
+

cookbooks/loki/install.rb

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+loki_url = ''
+loki_bin = ''
+
+vtag     = ''
+tag      = ''
+
+# 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/, '')
+
+    loki_bin = "#{node['loki']['zip']}"
+    loki_url = "#{node['loki']['url']}/#{vtag}/#{loki_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("loki --version 2>&1 | grep #{tag}", error: false)
+if result.exit_status != 0
+  # Download:
+  TMP = "/tmp/#{loki_bin}"
+
+  execute "wget #{loki_url} -O #{TMP}"
+
+  # Install:
+  directory node['loki']['storage'] do
+    owner 'root'
+    group 'root'
+    mode '755'
+  end
+
+  execute "unzip -d #{node['loki']['storage']} #{TMP}"
+
+  # Change Owner and Permissions:
+  file "#{node['loki']['storage']}loki-linux-amd64" do
+    owner 'root'
+    group 'root'
+    mode  '755'
+  end
+
+  # Create Link
+  link "#{node['loki']['location']}loki" do
+    to "#{node['loki']['storage']}loki-linux-amd64"
+  end
+end

cookbooks/loki/setup.rb

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+# Create `/etc/loki/`:
+%w(/etc/loki).each do |d|
+  directory d do
+    owner  'root'
+    group  'root'
+    mode   '0755'
+  end
+end
+
+# Deploy `prometheus` files:
+remote_file '/etc/loki/loki-config.yml' do
+  owner  'root'
+  group  'root'
+  mode   '644'
+end
+
+# Deploy `systemd` configuration for `prometheus`:
+remote_file '/etc/systemd/system/loki.service' do
+  owner  'root'
+  group  'root'
+  mode   '644'
+end
+
+# Service setting:
+service 'loki' do
+  action [ :enable, :restart ]
+end
+
+# Depoy `consul` service configuration for `loki`:
+remote_file '/etc/consul.d/service-loki.json' do
+  owner  'root'
+  group  'root'
+  mode   '644'
+
+  notifies :restart, 'service[supervisor]'
+end
+
+# Depoy `promtail` configuration for `loki`:
+HOSTNAME = run_command('uname -n').stdout.chomp
+
+template '/etc/promtail/loki.yaml' do
+  owner  'root'
+  group  'root'
+  mode   '644'
+
+  variables(HOSTNAME: HOSTNAME, LOKIENDPOINT: node['promtail']['lokiendpoint'])
+
+  notifies :restart, 'service[promtail-loki]'
+end
+
+# Deploy `systemd` configuration for `promtail-loki`:
+remote_file '/etc/systemd/system/promtail-loki.service' do
+  owner  'root'
+  group  'root'
+  mode   '644'
+end
+
+# Service setting:
+service 'promtail-loki' do
+  action [ :enable, :restart ]
+end
+
+remote_file '/etc/rsyslog.d/30-loki.conf' do
+  owner 'root'
+  group 'root'
+  mode '644'
+
+  notifies :restart, 'service[rsyslog]'
+end
+
+service 'rsyslog' do
+  action [ :nothing ]
+end
+
+# Deploy the `logrotated` configuration:
+remote_file '/etc/logrotate.d/loki' do
+  owner 'root'
+  group 'root'
+  mode '644'
+end
+
+# Restart the `supervisor`:
+service 'supervisor' do
+  action :nothing
+end
+
+# Firewall settings here:
+%w( 3100/tcp ).each do |p|
+  execute "ufw allow #{p}" do
+    user 'root'
+
+    not_if "LANG=c ufw status | grep #{p}"
+
+    notifies :run, 'execute[ufw reload-or-enable]'
+  end
+end
+
+execute 'ufw reload-or-enable' do
+  user 'root'
+  command 'LANG=C ufw reload | grep skipping && ufw --force enable || exit 0'
+
+  action :nothing
+end