Simon bfgits

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

Installing node_exporter

Steps to install node_exporter

Add user for node_exporter

sudo useradd --no-create-home --shell /bin/false node_exporter

To install tcptraceroute on Debian/Ubuntu:

$ sudo apt-get install tcptraceroute

To install tcptraceroute on CentOS/REHL, first set up RepoForge on your system, and then:

$ sudo yum install tcptraceroute

7.2 JSON处理

JSON（Javascript Object Notation）是一种轻量级的数据交换语言，以文字为基础，具有自我描述性且易于让人阅读。尽管JSON是Javascript的一个子集，但JSON是独立于语言的文本格式，并且采用了类似于C语言家族的一些习惯。JSON与XML最大的不同在于XML是一个完整的标记语言，而JSON不是。JSON由于比XML更小、更快，更易解析,以及浏览器的内建快速解析支持,使得其更适用于网络数据传输领域。目前我们看到很多的开放平台，基本上都是采用了JSON作为他们的数据交互的接口。既然JSON在Web开发中如此重要，那么Go语言对JSON支持的怎么样呢？Go语言的标准库已经非常好的支持了JSON，可以很容易的对JSON数据进行编、解码的工作。

前一小节的运维的例子用json来表示，结果描述如下：

{"servers":[{"serverName":"Shanghai_VPN","serverIP":"127.0.0.1"},{"serverName":"Beijing_VPN","serverIP":"127.0.0.2"}]}

本小节余下的内容将以此JSON数据为基础，来介绍go语言的json包对JSON数据的编、解码。

	# Use this script to test that your Telegram bot works.
	#
	# Install the dependency
	#
	# $ gem install telegram_bot
	#
	# Run the bot
	#
	# $ ruby bot.rb
	#

	git clone https://github.com/certbot/certbot.git
	acme.sh --issue --dns --yes-I-know-dns-manual-mode-enough-go-ahead-please -d *.abcd.com
	添加完dns txt记录再运行以下命令

	acme.sh --renew --yes-I-know-dns-manual-mode-enough-go-ahead-please -d *.abcd.com

	参考https://github.com/acmesh-official/acme.sh/wiki/dns-manual-mode

	# certbot

	Short Description
	The default behavior of an Amazon EC2 instance associated with an Amazon Virtual Private Cloud (Amazon VPC) is to request a DNS server address at startup using the Dynamic Host Configuration Protocol (DHCP). The DNS server addresses returned in the DHCP response are written to the local /etc/resolv.conf file. Manual modifications to the resolv.conf file with custom DNS server addresses are lost when the instance is restarted. The method that you use to solve this issue depends on your Linux distribution. For more information on VPCs and DNS servers, see Amazon DNS Server.
	Resolution
	Important: Before you change your Amazon EC2 instance, create a backup using an Amazon Machine Image (AMI) or an Amazon Elastic Block Store (Amazon EBS) snapshot. Changing networking configuration for an instance might render the instance unreachable.

	Amazon Linux, Amazon Linux 2

	Use one of the following options to configure your Amazon EC2 instance. If you apply both options, then the DNS servers specified in

	#!/usr/bin/env python
	# -- coding: UTF-8 --
	'''
	@File : analyze_aliyun_fee
	@Date : 16/10/2020 2:53 PM
	@Desc :
	'''

	import pandas as pd

	# available limit
	user@ubuntu:~$ ulimit -n
	1024

	# To increase the available limit to say 65535
	user@ubuntu:~$ sudo vim /etc/sysctl.conf

	# add the following line to it
	fs.file-max = 65535

	How to disable automatic updates on Server 2016.

	Open an elevated command prompt window or PowerShell session
	Type sconfig and press enter.
	Select option 5
	Now select “A” for automatically download and install updates, “D” for download only or “M” for Manual updates.

Simon bfgits

Common Options

Installing node_exporter

7.2 JSON处理

解析JSON