diff --git a/src/faaso.cr b/src/faaso.cr
index 053f833..6fa2b89 100644
--- a/src/faaso.cr
+++ b/src/faaso.cr
@@ -24,7 +24,7 @@ module Faaso
           # TODO: decide template based on file extensions or other metadata
           template = "templates/crystal"
           tmp_dir = "tmp/#{UUID.random}"
-          slug = arg.gsub("/","_").strip("_")
+          slug = arg.gsub("/", "_").strip("_")
           repo = "localhost:5000"
           tag = "#{repo}/#{slug}:latest"
           puts "Building function... #{arg} in #{tmp_dir}"
@@ -37,6 +37,8 @@ module Faaso
           docker_api.images.build(context: tmp_dir, tags: [tag, "#{slug}:latest"]) { }
           puts "Pushing to repo as #{tag}"
           docker_api.images.tag(repo: repo, name: slug, tag: "latest")
+          # FIXME: pushing is broken because my test registry has no auth
+          # docker_api.images.push(name: slug, tag: "latest", auth: "")
         end
       end
     end
@@ -52,9 +54,42 @@ module Faaso
 
       def run
         @arguments.each do |arg|
-          puts "Starting function... #{arg}"
-          # TODO: Check that we have an image for the function
+          slug = arg.gsub("/", "_").strip("_")
+          repo = "localhost:5000"
+          tag = "#{repo}/#{slug}:latest"
+          docker_api = Docr::API.new(Docr::Client.new)
+          # Pull image from registry
+          docker_api.images.create(image: tag)
           # TODO: Start a container with the image
+          containers = docker_api.containers.list(all: true)
+          pp! containers
+          # If it's running, do nothing
+          if (containers.any? { |c|
+               c.@image == tag && c.@state == "running"
+             })
+            puts "#{arg} is already running"
+            return 0
+          end
+
+          # If it is exited, start it
+          existing = containers.select { |c|
+            c.@image == tag && c.@state == "exited"
+          }
+
+          puts "Starting function #{arg}"
+          if (existing.size > 0)
+            puts "Restarting existing exited container"
+            docker_api.containers.start(existing[0].@id)
+          else
+            conf = Docr::Types::CreateContainerConfig.new(
+              image: tag,
+              hostname: "foo",
+              host_config: Docr::Types::HostConfig.new
+            )
+            # FIXME: name should be unique
+            response = docker_api.containers.create(name: "fungus", config: conf)
+            docker_api.containers.start(response.@id)
+          end
           # TODO: Run test for healthcheck
           # TODO: Map route in reverse proxy to function
           # TODO: Return function URL for testing