Class: StackBuilder::Chef::ContainerNodeManager

Inherits:
NodeManager show all
Defined in:
lib/stackbuilder/chef/stack_container_node.rb

Constant Summary

Constants inherited from NodeManager

NodeManager::SSH_CREDENTIAL_KEYS

Instance Attribute Summary

Attributes inherited from NodeManager

#name, #node_id, #run_list, #run_on_event

Instance Method Summary collapse

Methods inherited from NodeManager

#config_knife, #create, #create_vm, #delete_vm, #get_name, #get_scale, #get_ssh_credentials, #node_attributes, #process_vm

Methods inherited from Stack::NodeManager

#create, #get_name, #get_scale, #node_attributes, #set_scale

Constructor Details

#initialize(id, node_config, repo_path, environment) ⇒ ContainerNodeManager

Returns a new instance of ContainerNodeManager.



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# File 'lib/stackbuilder/chef/stack_container_node.rb', line 9

def initialize(id, node_config, repo_path, environment)

    super(id, node_config, repo_path, environment)

    @env_file_path = repo_path + '/environments/' + environment + '.rb'

    @dockerfiles_build_dir = repo_path + '/.build/docker/build'
    FileUtils.mkdir_p(@dockerfiles_build_dir)

    docker_image_dir = repo_path + '/.build/docker/' + environment
    FileUtils.mkdir_p(docker_image_dir)

    docker_image_filename = docker_image_dir + '/' + @name
    @docker_image_path = docker_image_filename + '.gz'
    @docker_image_target = docker_image_filename + '.target'
end

Instance Method Details

#delete(index) ⇒ Object 



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# File 'lib/stackbuilder/chef/stack_container_node.rb', line 174

def delete(index)

    super(index)
end

#process(index, events, attributes, target = nil) ⇒ Object 



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# File 'lib/stackbuilder/chef/stack_container_node.rb', line 26

def process(index, events, attributes, target = nil)

    return unless events.include?('create') || events.include?('install') || 
        events.include?('configure') || events.include?('update')

    target_node_instance = "#{target.node_id}-#{index}"
    node = Chef::Node.load(target_node_instance)

    if @knife_config.has_key?('ip_attribute')

        v = lambda { |h,k| k.size>1 ? v.call(h[k.shift],k) : h[k.shift] }
        ipaddress = v.call(node.attributes, @knife_config['ip_attribute'].split('.'))
    else
        ipaddress = node.attributes['ipaddress']
    end

    ssh_user, ssh_password, ssh_identity_file = target.get_ssh_credentials(target_node_instance)
    ssh = ssh_create(ipaddress, ssh_user, ssh_password || ssh_identity_file)

    image_exists = @name==ssh_exec!(ssh, "docker images | awk '$1==\"@name\" { print $1 }'")[:out].strip

    # Copy image file to target if it has changed or does not exist on target
    if build_container(attributes) && !target.nil? &&
        ( !File.exist?(@docker_image_target) ||
        (File.mtime(@docker_image_path) > File.mtime(@docker_image_target)) ||
        !image_exists )

        puts "Uploading docker image to target '#{target_node_instance}'."
        ssh.open_channel do |channel|

            channel.exec('gunzip | sudo docker load') do |ch, success|
                channel.on_data do |ch, data|
                    res << data
                end

                channel.send_data IO.binread(@docker_image_path)
                channel.eof!
            end
        end
        ssh.loop

        FileUtils.touch(@docker_image_target)
    end

    # Start container instances
    if @knife_config.has_key?('container_start')

        result = ssh_exec!(ssh, "sudo docker ps -a | awk '/#{@node_id}/ { print $0 }'")
        raise StackBuilder::Common::StackBuilderError, "Error determining running containers for #{@name}: #{result[:err]}" \
            if result[:exit_code]>0

        running_instances = result[:out].lines
        if running_instances.size > @scale

            (running_instances.size - 1).downto(@scale) do |i|

                container_node_id = "#{@node_id}-#{i}"
                running_instance = running_instances.select{ |ri| ri[/#{@node_id}-\d+/,0]==container_node_id }
                container_id = running_instance.first[/^[0-9a-z]+/,0]

                result = ssh_exec!(ssh, "sudo docker rm -f #{container_id}")

                if result[:exit_code]==0

                    remove_container_node_from_chef(container_node_id)

                    container_port_map = Hash.new
                    container_port_map.merge!(node.normal['container_port_map']) \
                        unless node.normal['container_port_map'].nil?

                    container_port_map.each do |k,v|
                        container_port_map[k].delete(container_node_id)
                    end

                    node.normal['container_port_map'] = container_port_map
                    node.save
                else
                    @logger.error("Unable to stop container instance #{running_instances[i]}: #{result[:err]}")
                end
            end

        elsif running_instances.size < @scale

            container_start = @knife_config['container_start']
            container_ports = container_start['ports']
            container_options = container_start['options']

            start_cmd = "sudo docker run -d "

            start_cmd += container_options + ' ' \
                unless container_options.nil?

            start_cmd += container_ports.collect \
                { |k,p| "-p :#{p=~/\d+\:\d+/ ? p.to_s : ':' + p.to_s}" }.join(' ') \
                unless container_ports.nil?

            running_instances.size.upto(@scale - 1) do |i|

                container_node_id = "#{@node_id}-#{i}"
                remove_container_node_from_chef(container_node_id)

                result = ssh_exec!( ssh,
                    "#{start_cmd} --name #{container_node_id} " +
                    "-h #{container_node_id} -e \"CHEF_NODE_NAME=#{container_node_id}\" #{@name}")

                if result[:exit_code]==0

                    container_id = container_node_id

                    container_port_map = Hash.new
                    container_port_map.merge!(node.normal['container_port_map']) \
                        unless node.normal['container_port_map'].nil?

                    container_ports.each do |k,p|

                        port_map = container_port_map[k]
                        if port_map.nil?

                            port_map = { }
                            container_port_map[k] = port_map
                        end

                        if p=~/\d+\:\d+/
                            port_map[container_id] = p[/(\d+)\:\d+/, 1]
                        else
                            result = ssh_exec!(ssh, "sudo docker port #{container_node_id} #{p}")

                            @logger.error( "Unable to get host port for " +
                                "'#{@node_id}-#{i}:#{p}': #{result[:err]}") \
                                if result[:exit_code]>0

                            port_map[container_id] = result[:out][/:(\d+)$/, 1]
                        end
                    end

                    node.normal['container_port_map'] = container_port_map
                    node.save
                else
                    @logger.error("Unable to start container instance '#{@node_id}-#{i}': #{result[:err]}")
                end
            end
        end

    end

    super(index, events, attributes, target)
end