Example of how to restart a service, wait for it to come up, and then do more things

jenkins_recipe.rb

  # drop in a template and immediately restart jenkins
  template "#{node['jenkins']['master']['home']}/config.xml" do
    source 'config.xml.erb'
    variables({
                'github_client_id' => <REDACTED>,
                'github_client_secret' => <REDACTED>
              })
    owner node['jenkins']['master']['user']
    group node['jenkins']['master']['group']
    mode '0600'
    notifies :restart, 'service[jenkins-service]', :immediately
  end
end

# Make sure jenkins is entirely up & functioning normally
cc_jenkins_verify_url_reachability 'verify_jenkins_is_running' do
  url "#{<REDACTED>}://<REDACTED>:#{<REDACTED>}/"
  retry_count 10
  retry_delay_secs 10
  username <REDACTED>
  password lazy { <REDACTED> }
  secure <REDACTED>
end

# do more things

verify_url_reachability.rb

use_inline_resources
# Will attempt to do a GET request to the specified url retry_count times with a delay of
# retry_delay_secs in between attempts.  A successful connection means an HTTP response was
# returned with a code matching expected_http_status
# TODO: add https support and methods other than GET
action :verify do
  attempt_num = 1
  uri = URI.parse(@new_resource.url)
  if uri.scheme != 'http'
    raise "Unsupported scheme: #{uri.scheme}.  Currently only http scheme is supported"
  end
  http = Net::HTTP.new(uri.host, uri.port)
  request = Net::HTTP::Get.new(uri.path)
  if @new_resource.secure
    request.basic_auth(@new_resource.username, @new_resource.password)
  end
  begin
    Chef::Log.info("trying to connect to #{@new_resource.url} (attempt #{attempt_num}/#{@new_resource.retry_count})")
    response = http.request(request)
    if response.code != @new_resource.expected_http_status.to_s
      raise "Unexpected status: #{response.code}"
    end
    Chef::Log.info("Connection to #{@new_resource.url} successfully established")
  rescue StandardError => e
    Chef::Log.warn("attempt #{attempt_num}/#{@new_resource.retry_count} to connect to #{@new_resource.url} failed")
    if attempt_num == @new_resource.retry_count
      raise e, "Failed to connect to #{@new_resource.url}"
    end
    attempt_num += 1
    sleep(@new_resource.retry_delay_secs)
    retry
  end
end