真正的服务器派生出线程 和子进程处理多个连接
当允许客户端加入聊天室,他发送的任何一条文本都将广播给聊天室中的每个用户,除非文本是服务器CLI
当广播一条消息，消息前面将加上发送者的昵称 以尖括号括住昵称<Ruiy>Hello,all;
清楚地知道谁发送了什么消息区分系统消息和,并且从视觉上

命令的执行改变了聊天室的状态
用户改变了昵称 或是退出
用户将收到一条聊天室的状态更改

tlent 23
ftp 21
80listen default
mstsc 3389 ->10061
26 10051

netstat -na | findstr LISTEN

人类在预测一个系统中将要发生瓶颈的位置方面表现的非常糟糕
all managed through a dashboard that gives administrators control while empowering their users to provision resources through a web interface
abstract
contents search in this guide
the openstack system consists of several key projects that you install sepqrately

determine and implement necessary core and optional services to meet performance and reduncy requirements
increase security using methods such firewalls,encryption,and service policies
implement a deployment tool such as Ansible,Chef,Puppet
or Salt to automate deployment and management of the production environment;
Networking agents reside on controller node instead of one or more dedicated network nodes;
for information on production architectures,See the architecture design guide operations guide networking guide
hardware dedimecode;
requirements;
core component
optional components;
identity image management portions of compute/Networking
various networking agents and the dashboard;
it also includes supports services such as SQL database message queue and NTP;
optionally
requires a minimum of two network interfaces;

the compute node runs the hypervisor portion of compute
compute node also runs a networking service agent that connects instances to virtual networks and provides firewalling services to instances via security groups;

for simplicity service traffic between compute nodes and this node uses the management network
production environments should implement a sepqrate storage network to increase performance and security;

can deploy more than one block storage node
increase performance and security

networking option 1: provider networks

The provider networks option deploys the openstack networking service in the simplest way possible with primarily layer-2
(bridgeing/switching)

essentialy,it bridges virtual networks to physical networks and relies on phycical network infrastructure for layer-3(routing)service,additionally aDHCP service provides ip address information to instance;
relies on physical network infrastructure for layer-3(routing) services
additionally

this option lacks supports for self-service private networks,layer-3(routing)services,and advanced services such as LBaas and FWaas

consider the self-service  networks option if you desire these feature

provider netwoorks

controller node compute nodes block storage nodes;
service layer
sql mq network queue identity image service compute anagement
networking management
networking ml2 plug-in
linux network utilities
networking linux bridge agent
networking dhcp agent

networking linux bridge agent
linux network utilities;

networking ml2 plug-in;
kvm hypervisor
compute
linux network utilities
networking linux bridge agent
telemetry agent;

service layout  compute nodes
kvm hypervisor
compute
linux network utilities networking

linux bridge agent;
iscsi target
block stoage volume service

object storage nodes;
object storage account service
object storage container service
object storage object service;

augments
augments
增加

ml2 l3
Although most environments include identity
can operate independently
independently
dashboard requires at least the image service compute and networking;

proof-of-concept
concept
概念验证
concept
proof
core services;
processor

to minimize clutter minimize
clutter;
provide more resources for
distribution
single disk partiition on each node wotks for most basic installations
should consider logical volume manager
one physcial server can support multiple nodes eachh with almost any number of ability to take periodic periodic periodic snap shots
throughout the installation process and roll back;
to a
reduce performance particularly hypervisor and/or processor lacks support for hardware acceleration of nested VMs;

make sure your hypervisor provides a way to disable MAC address filtering on the public network interface;

support various security methods
additionally
supporting services including the database and message broker support at least password security
to easethe installation process
guide only covers password security where abb
create secure passwords manually
generate them using a tool such as pwgen
pwgen
openssl rand -hex 10
to highlight the importance of network separ
the public interface uses a special configuration whithout an ip address assigned to it
configure the second interface as the public interface
replace with the actual interface name do not change the hwaddr and uuid keys;
device = interface_name
type = ethernet
onboot = yes
bootproto = none;
start the NTP service and configure

created symlink from
/etc/systemd/system/mylti-user.target.wants/chronyd.service to
/usr/lib/systemd/system/chrony.service
disable or remove any automatic update services they can impact your openstack environments

breaking backwards compatibility
preferably pin packages versions using the yum-versionlock plugin

enable additional repositories using the subscription manager;
enable additional repositories using the subscriptions manager

subscription-manager repos --enable=rhel-7-server-optional-rpms
rhel-7-server-extras-rpms;
does not require these repositories
base extras updates
finalize the installation
upgrade the packages on your host;
most openstack services use an SQL database to store information
the database typically runs on the controller node
The procedures in this guide use depending on the distribution
create and edit and complete the following actions
enable access by other nodes via the management network;
set the following keys to enable useful options and the utf-8 character set;
finalize installation
start the database service and configure it to start when system boots;
install and configure components;
协调coordinate coordinate
coordinate operations and status
information among service