linux

查本机公网ip

curl ifconfig.me

[service@yfb-105-13-tx log]$ curl ifconfig.me
***.***.***.***

curl cip.cc

[service@yfb-105-13-tx log]$ curl cip.cc
IP      : ***.***.***.***
地址    : 中国  中国

数据二  : 北京市海淀区 | ***(北京)科技有限公司

数据三  : 中国北京北京 | 电信

URL     : http://www.cip.cc/106.52.177.102

ps aux名COMMAND列带中括号([ ])

>>> ps aux
USE   PID %CPU %MEM    VSZ   RSS TTY STAT START TIME COMMAND
root    1  0.0  0.1 194960  9412 ?   Ss    2019 9:12 /opt/gitlab/embedded/sbin/nginx -p /var/opt/gitlab/nginx
root    2  0.0  0.0      0     0 ?   S     2019 0:00 [kthreadd]

>>> man ps
args COMMAND command with all its arguments as a string. Modifications to the 
             arguments may be shown.  The output in this column may contain 
             spaces.  A process marked <defunct> is partly dead, waiting to be 
             fully destroyed by its parent.  Sometimes the process args will be 
             unavailable; when this happens, ps will instead print the executable 
             name in brackets.  (alias cmd, command).  See also the comm format 
             keyword, the -f option, and the c option. When specified last, this 
             column will extend to the edge of the display.  If ps can not 
             determine display width, as when output is redirected (piped) into 
             a file or another command, the output width is undefined (it may be 
             80, unlimited, determined by the TERM variable, and so on).  The 
             COLUMNS environment variable or --cols option may be used to exactly 
             determine the width in this case.  The w or -w option may be also 
             be used to adjust width.

当ps命令获取不到指令的参数时，ps把命令放到中括号里面。

crontab配置文件

crontab常用命令
打印crontab配置crontab -l
修改crontab配置crontab -e
crontab配置文件目录，每个用户的crontab配置独立，目录如下，配置文件以用户名命名(不同操作系统位置稍有差异)

cd /var/spool/cron/crontabs

查看网页最后修改时间

document.lastModified

document.lastModified
"05/14/2020 16:37:00"

打开浏览器开发者工具，在console下输入document.lastModified
返回格式是：dd/mm/yyyy hh:mm:ss

http返回头里的last-modified

import requests

url = '***'
header = requests.head(url)
print(header.headers.get('Last-Modified'))

>>> Wed, 06 May 2020 12:38:16 GMT

GMT表示返回的是格林尼治时间，转换成北京时间要往后推8小时

CER证书转PEM证书

CER证书有两种，DER（二进制），Base64（base64）

openssl x509 -inform DER -in ***.cer -out ***.pem

PEM证书

nginx配置https证书

在server下配置ssl_certificate和ssl_certificate_key，其中ssl_certificate是公钥文件，ssl_certificate_key是私钥文件，缺省目录为./conf。配置好重启nginxnginx -s reload

server {
    
    
	listen 443;
	server_name sexyman.com;
	ssl on;
	ssl_certificate sexyman.com.crt;
	ssl_certificate_key sexyman.com.key;
	....
}

校验https证书公私钥配对

openssl提取信息进行精准对比，输出信息一致则表示配对成功

# 对私钥操作
>>> openssl rsa -pubout -in sexyman.com.key
writing RSA key
-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjGUZ/qbA85Y+oEYZdJeY
ItIB+8RQtX/MGvpPEVejQuB5fGFNgamH0Z1lwb524b5cVvinF9b3yQ0Hf4o1HkT6
MKki1UzZHqFoR7ZZ4eqs97qiryHHw6W4LUa3nONo6W3T2UxcENRqh3FU/hB/Tktu
ewIDAQAB
-----END PUBLIC KEY-----
# 对公钥操作
>>> openssl x509 -pubkey -noout -in sexyman.com.crt
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjGUZ/qbA85Y+oEYZdJeY
ItIB+8RQtX/MGvpPEVejQuB5fGFNgamH0Z1lwb524b5cVvinF9b3yQ0Hf4o1HkT6
MKki1UzZHqFoR7ZZ4eqs97qiryHHw6W4LUa3nONo6W3T2UxcENRqh3FU/hB/Tktu
ewIDAQAB

postman post文件

form-data栏下key类型选择File，不要忘记输入key的值，否则服务器获取不到文件内容

linux域名解析

绑定域名-ip

配置文件/etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

10.0.1.31	ews.500.com
10.0.0.228	ets.500.com

设置dns服务器

配置文件/etc/resolv.conf

; generated by /sbin/dhclient-script
search openstacklocal
nameserver	114.114.114.114	# 移动、联通、电信通用dns
nameserver	8.8.8.8			# google dns
nameserver	180.76.76.76	# 百度dns
nameserver	223.5.5.5		# 阿里dns
nameserver	223.6.6.6.		# 阿里dns

IT记事本

目录