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今日突发奇想，想查看一下服务器各硬件的负载情况，但是使用free、top等这些linux命令，智能看到一堆数据，不能可视化展现网络、内存、内存使用情况
于是，经过查资料，发现了一个比较好用的工具：pydash
pydash是一个基于python和django的性能监测工具。可以运行在centos、ubuntu等主流的linux发行版本上，能够统计服务器资源，监控服务器性能
效果展示
话不多说，先来几张图片看看效果：
讲真，效果还是可以的
安装过程
建议初次安装，请尽量在测试机上实现
1. 使用git克隆pydash到本地
此处认为你已经安装好了git和python（无论是python2.x，还是python3.x）
克隆pydash到本地
git clone https://gitlab.com/k3oni/pydash.git
cd pydash
复制代码显示结果：
正克隆到 'pydash'...
remote: Enumerating objects: 1230, done.
remote: Counting objects: 100% (1230/1230), done.
remote: Compressing objects: 100% (588/588), done.
remote: Total 1230 (delta 625), reused 1230 (delta 625)
接收对象中: 100% (1230/1230), 1.25 MiB | 683.00 KiB/s, done.
处理 delta 中: 100% (625/625), done.
复制代码2. 创建虚拟环境
为了不与服务器上现有环境冲突，此处创建虚拟环境，所有操作在虚拟环境中进行
pip install virtualenv
virtualenv pydashtest
复制代码如果创建python2.7版本的虚拟环境，创建命令如下：
virtualenv pydashtest --python=python2.7
复制代码此时就创建好了虚拟环境pydashtest
Using base prefix '/usr/local'
New python executable in /home/jh/pydash/pydashtest/bin/python3.6
Also creating executable in /home/jh/pydash/pydashtest/bin/python
Installing setuptools, pip, wheel...
done.
复制代码3. 激活虚拟环境
source pydashtest/bin/activate
复制代码此时会发现shell界面发生了变化：
(pydashtest) [jh@localhost pydash]$
说明已经进入虚拟环境，如果需要退出当前虚拟环境，使用命令
deactivate
复制代码即可退出
4. 安装django
由于pydash是基于python和django的，所以需要安装django
有两种方式，一种直接使用pydash下的requirements.txt文件进行安装
pip install -r requirements.txt
复制代码此时，实际上安装了django的1.6.8版本，如果python的版本高于3.5的话，在后续使用django命令创建项目的时候，会报如下错误：
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
utility.execute()
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/core/management/__init__.py", line 392, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/core/management/__init__.py", line 261, in fetch_command
commands = get_commands()
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/core/management/__init__.py", line 107, in get_commands
apps = settings.INSTALLED_APPS
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/conf/__init__.py", line 54, in __getattr__
self._setup(name)
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/conf/__init__.py", line 50, in _setup
self._configure_logging()
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/conf/__init__.py", line 72, in _configure_logging
from django.utils.log import DEFAULT_LOGGING
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/utils/log.py", line 7, in <module>
from django.views.debug import ExceptionReporter, get_exception_reporter_filter
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/views/debug.py", line 12, in <module>
from django.template import Template, Context, TemplateDoesNotExist
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/template/__init__.py", line 53, in <module>
from django.template.base import (ALLOWED_VARIABLE_CHARS, BLOCK_TAG_END,
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/template/base.py", line 19, in <module>
from django.utils.html import escape
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/utils/html.py", line 14, in <module>
from .html_parser import HTMLParser, HTMLParseError
File "/home/jh/pydash/pydashtest/lib/python3.6/site-packages/django/utils/html_parser.py", line 12, in <module>
HTMLParseError = _html_parser.HTMLParseError
AttributeError: module 'html.parser' has no attribute 'HTMLParseError'
复制代码原因：
HTMLParseError is deprecated from Python 3.3 onwards and removed in Python 3.5.
解决办法：
- 降低python的版本
- 升级django的版本
此处采用第二种方法，直接安装django较高版本为最方便最快捷的办法
pip install django==1.8
复制代码5. 创建项目数据库，安装Django身份验证系统
python manage.py syncdb
复制代码输入用户信息：
Operations to perform:
Synchronize unmigrated apps: staticfiles, messages
Apply all migrations: contenttypes, sessions, auth
Synchronizing apps without migrations:
Creating tables...
Running deferred SQL...
Installing custom SQL...
Running migrations:
Rendering model states... DONE
Applying contenttypes.0001_initial... OK
Applying contenttypes.0002_remove_content_type_name... OK
Applying auth.0001_initial... OK
Applying auth.0002_alter_permission_name_max_length... OK
Applying auth.0003_alter_user_email_max_length... OK
Applying auth.0004_alter_user_username_opts... OK
Applying auth.0005_alter_user_last_login_null... OK
Applying auth.0006_require_contenttypes_0002... OK
Applying sessions.0001_initial... OK
You have installed Django's auth system, and don't have any superusers defined.
Would you like to create one now? (yes/no): yes
Username (leave blank to use 'jh'):
Email address: linupy@163.com
Password:
Password (again):
Superuser created successfully.
复制代码此处的Username和Password，就是监控系统登录的用户名和密码，邮箱可写可不写
6. 启动服务（后台）
以上步骤无误后，就可以启动服务了，此处采用后台运行的方式
nohup python ./manage.py runserver 192.168.0.3:8000 &
复制代码结果：
Performing system checks...
System check identified no issues (0 silenced).
April 03, 2019 - 00:58:37
Django version 1.8, using settings 'pydash.settings'
Starting development server at http://192.168.0.3:8000/
Quit the server with CONTROL-C.
复制代码浏览器输入192.168.0.3:8000，即可进入用户登录界面
输入第5步设置的用户名和密码就能登录系统了
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