Simon bfgits

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。

解析JSON

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

	fields @timestamp, @message
	\| sort @timestamp desc
	\|filter @message like /bbb4e265-08b5-44be-9296-bb5ece1cxxxx/
	\| limit 20

	SELECT
	table_schema 'Database Name',
	SUM(data_length + index_length) 'Size in Bytes',
	ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) 'Size in MiB'
	FROM information_schema.tables
	GROUP BY table_schema;

	#调整分区大小
	$ sudo resize2fs /dev/xvda1

	service sshd start
	yum -y install setuptool
	yum -y install ntsysv system-config-firewall-tui system-config-network-tui
	yum -y install openssh-clients
	yum -y install telnet vim ntpdate wget
	yum install ntp ntpdate ntp-doc
	yum install mkfontscale （字体工具）

	#https://istio.io/docs/ops/diagnostic-tools/istioctl/
	#https://github.com/istio/istio/issues/12607

	curl -sL https://istio.io/downloadIstioctl \| sh -

	export PATH=$PATH:$HOME/.istioctl/bin

	#generate the bash completion file
	istioctl collateral --bash
	source istioctl.bash

	Open an elevated command prompt window ： cmd with admin
	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.


	https://www.tdsheridanlab.com/disable-automatic-updates-on-server-2016/

	#https://stackoverflow.com/questions/54994641/openssh-private-key-to-rsa-private-key
	#You have an OpenSSH format key and want a PEM format key. It is not intuitive to me, but the suggested way to convert is by changing the password for the key and writing it in a different format at the same time. The command looks like this:

	ssh-keygen -p -N "" -m pem -f /path/to/key

	#It will change the file in place, so make a backup of your current key just in case. -N "" will set the passphrase as none. I haven't tested this with a passphrase.
	#The public key should be fine as is.
	#For the full explanation of the above command, see the -m option here: https://man.openbsd.org/ssh-keygen

	解密aws windows ec2密码的时候会报以下错误。