Switch to host naming

Servers concept will encompass custom cmd and labels. Host is just the IP address.

lib/mrsk/configuration.rb

@@ -17,8 +17,9 @@ class Mrsk::Configuration
     ensure_required_keys_present
   end
 
-  def servers
+  def hosts
-    ENV["SERVERS"] || config.servers
+    ENV["HOSTS"] || config.servers
+  end
   end
 
   def version

lib/tasks/mrsk/app.rake

@@ -14,12 +14,12 @@ namespace :mrsk do
 
     desc "Pull app image from the registry onto servers"
     task :pull do
-      on(MRSK_CONFIG.servers) { execute *app.pull }
+      on(MRSK_CONFIG.hosts) { execute *app.pull }
     end
 
     desc "Run app on servers (or start them if they've already been run)"
     task :run do
-      on(MRSK_CONFIG.servers) do |host|
+      on(MRSK_CONFIG.hosts) do |host|
         begin
           execute *app.run
         rescue SSHKit::Command::Failed => e
@@ -33,32 +33,14 @@ namespace :mrsk do
       end
     end
 
-    desc "Run app on servers (or start them if they've already been run)"
-    task :run do
-      MRSK_CONFIG.roles.each do |role|
-        on(MRSK_CONFIG.servers(role: role)) do |host|
-          begin
-            execute *app.run(role: role)
-          rescue SSHKit::Command::Failed => e
-            if e.message =~ /already in use/
-              puts "Container with same version already deployed on #{host}, starting that instead"
-              execute *app.start, host: host
-            else
-              raise
-            end
-          end
-        end
-      end
-    end
-
     desc "Start existing app on servers"
     task :start do
-      on(MRSK_CONFIG.servers) { execute *app.start, raise_on_non_zero_exit: false }
+      on(MRSK_CONFIG.hosts) { execute *app.start, raise_on_non_zero_exit: false }
     end
 
     desc "Stop app on servers"
     task :stop do
-      on(MRSK_CONFIG.servers) { execute *app.stop, raise_on_non_zero_exit: false }
+      on(MRSK_CONFIG.hosts) { execute *app.stop, raise_on_non_zero_exit: false }
     end
 
     desc "Start app on servers (use VERSION=<git-hash> to designate which version)"
@@ -66,46 +48,46 @@ namespace :mrsk do
 
     desc "Display information about app containers"
     task :info do
-      on(MRSK_CONFIG.servers) { |host| puts "App Host: #{host}\n" + capture(*app.info) + "\n\n" }
+      on(MRSK_CONFIG.hosts) { |host| puts "App Host: #{host}\n" + capture(*app.info) + "\n\n" }
     end
 
     desc "Execute a custom task on servers passed in as CMD='bin/rake some:task'"
     task :exec do
-      on(MRSK_CONFIG.servers) { |host| puts "App Host: #{host}\n" + capture(*app.exec(ENV["CMD"])) + "\n\n" }
+      on(MRSK_CONFIG.hosts) { |host| puts "App Host: #{host}\n" + capture(*app.exec(ENV["CMD"])) + "\n\n" }
     end
 
     namespace :exec do
       desc "Execute Rails command on servers, like CMD='runner \"puts %(Hello World)\""
       task :rails do
-        on(MRSK_CONFIG.servers) { |host| puts "App Host: #{host}\n" + capture(*app.exec("bin/rails", ENV["CMD"])) + "\n\n" }
+        on(MRSK_CONFIG.hosts) { |host| puts "App Host: #{host}\n" + capture(*app.exec("bin/rails", ENV["CMD"])) + "\n\n" }
       end
 
       desc "Execute a custom task on the first defined server"
       task :once do
-        on(MRSK_CONFIG.servers.first) { |host| puts capture(*app.exec(ENV["CMD"])) }
+        on(MRSK_CONFIG.hosts.first) { |host| puts capture(*app.exec(ENV["CMD"])) }
       end
 
       namespace :once do
         desc "Execute Rails command on the first defined server, like CMD='runner \"puts %(Hello World)\""
         task :rails do
-          on(MRSK_CONFIG.servers.first) { puts capture(*app.exec("bin/rails", ENV["CMD"])) }
+          on(MRSK_CONFIG.hosts.first) { puts capture(*app.exec("bin/rails", ENV["CMD"])) }
         end
       end
     end
 
     desc "List all the app containers currently on servers"
     task :containers do
-      on(MRSK_CONFIG.servers) { |host| puts "App Host: #{host}\n" + capture(*app.list_containers) + "\n\n" }
+      on(MRSK_CONFIG.hosts) { |host| puts "App Host: #{host}\n" + capture(*app.list_containers) + "\n\n" }
     end
 
     desc "Tail logs from app containers"
     task :logs do
-      on(MRSK_CONFIG.servers) { execute *app.logs }
+      on(MRSK_CONFIG.hosts) { execute *app.logs }
     end
 
     desc "Remove app containers and images from servers"
     task remove: %i[ stop ] do
-      on(MRSK_CONFIG.servers) do
+      on(MRSK_CONFIG.hosts) do
         execute *app.remove_containers
         execute *app.remove_images
       end

lib/tasks/mrsk/prune.rake

@@ -7,12 +7,12 @@ namespace :mrsk do
   namespace :prune do
     desc "Prune unused images older than 30 days"
     task :images do
-      on(MRSK_CONFIG.servers) { execute "docker image prune -f --filter 'until=720h'" }
+      on(MRSK_CONFIG.hosts) { execute "docker image prune -f --filter 'until=720h'" }
     end
 
     desc "Prune stopped containers for the service older than 3 days"
     task :containers do
-      on(MRSK_CONFIG.servers) { execute "docker container prune -f --filter label=service=#{MRSK_CONFIG.service} --filter 'until=72h'" }
+      on(MRSK_CONFIG.hosts) { execute "docker container prune -f --filter label=service=#{MRSK_CONFIG.service} --filter 'until=72h'" }
     end
   end
 end

lib/tasks/mrsk/registry.rake

@@ -7,12 +7,12 @@ namespace :mrsk do
     desc "Login to the registry locally and remotely"
     task :login do
       run_locally             { execute *registry.login }
-      on(MRSK_CONFIG.servers) { execute *registry.login }
+      on(MRSK_CONFIG.hosts) { execute *registry.login }
     end
 
     desc "Logout of the registry remotely"
     task :logout do
-      on(MRSK_CONFIG.servers) { execute *registry.logout }
+      on(MRSK_CONFIG.hosts) { execute *registry.logout }
     end
   end
 end

lib/tasks/mrsk/server.rake

@@ -5,7 +5,7 @@ namespace :mrsk do
     desc "Setup Docker on the remote servers"
     task :bootstrap do
       # FIXME: Detect when apt-get is not available and use the appropriate alternative
-      on(MRSK_CONFIG.servers) { execute "apt-get install docker.io -y" }
+      on(MRSK_CONFIG.hosts) { execute "apt-get install docker.io -y" }
     end
   end
 end

lib/tasks/mrsk/traefik.rake

@@ -6,17 +6,17 @@ namespace :mrsk do
   namespace :traefik do
     desc "Run Traefik on servers"
     task :run do
-      on(MRSK_CONFIG.servers) { execute *traefik.run, raise_on_non_zero_exit: false }
+      on(MRSK_CONFIG.hosts) { execute *traefik.run, raise_on_non_zero_exit: false }
     end
 
     desc "Start existing Traefik on servers"
     task :start do
-      on(MRSK_CONFIG.servers) { execute *traefik.start, raise_on_non_zero_exit: false }
+      on(MRSK_CONFIG.hosts) { execute *traefik.start, raise_on_non_zero_exit: false }
     end
 
     desc "Stop Traefik on servers"
     task :stop do
-      on(MRSK_CONFIG.servers) { execute *traefik.stop, raise_on_non_zero_exit: false }
+      on(MRSK_CONFIG.hosts) { execute *traefik.stop, raise_on_non_zero_exit: false }
     end
 
     desc "Restart Traefik on servers"
@@ -24,12 +24,12 @@ namespace :mrsk do
 
     desc "Display information about Traefik containers from servers"
     task :info do
-      on(MRSK_CONFIG.servers) { |host| puts "Traefik Host: #{host}\n" + capture(*traefik.info) + "\n\n" }
+      on(MRSK_CONFIG.hosts) { |host| puts "Traefik Host: #{host}\n" + capture(*traefik.info) + "\n\n" }
     end
 
     desc "Remove Traefik container and image from servers"
     task remove: %i[ stop ] do
-      on(MRSK_CONFIG.servers) do
+      on(MRSK_CONFIG.hosts) do
         execute *traefik.remove_container
         execute *traefik.remove_image
       end