手把手教你安装Linux性能监控工具——pydash

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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
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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.
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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
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如果创建python2.7版本的虚拟环境，创建命令如下：

virtualenv pydashtest --python=python2.7
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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.
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3. 激活虚拟环境

source pydashtest/bin/activate
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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
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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
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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'
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原因：

HTMLParseError is deprecated from Python 3.3 onwards and removed in Python 3.5.

解决办法：

1. 降低python的版本
2. 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
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5. 创建项目数据库，安装Django身份验证系统

python manage.py syncdb
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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.
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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 &
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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.
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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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