使用Linux命令工具生成qrcode二维码

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4月 212021
 

命令行二维码工具qrencode包信息

[root@centos-s-1vcpu-1gb-nyc3-01 ~]# dnf info qrencode
Last metadata expiration check: 0:00:11 ago on Wed 21 Apr 2021 01:24:40 AM UTC.
Installed Packages
Name         : qrencode
Version      : 3.4.4
Release      : 5.el8
Architecture : x86_64
Size         : 35 k
Source       : qrencode-3.4.4-5.el8.src.rpm
Repository   : @System
From repo    : appstream
Summary      : Generate QR 2D barcodes
URL          : http://fukuchi.org/works/qrencode/
License      : LGPLv2+
Description  : Qrencode is a utility software using libqrencode to encode string data in
             : a QR Code and save as a PNG image.

[root@centos-s-1vcpu-1gb-nyc3-01 ~]#

准备内容文件

[root@centos-s-1vcpu-1gb-nyc3-01 ~]# echo "https://www.baidu.com/" > url.txt
[root@centos-s-1vcpu-1gb-nyc3-01 ~]# cat url.txt 
https://www.baidu.com/
[root@centos-s-1vcpu-1gb-nyc3-01 ~]#

生成文本二维码

 

防火墙iptables与firewalld端口转发规则

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1月 262021
 

iptables示例

sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8443

firewalld示例

# allow incoming connections on port 80.
# You can also use --add-service=http instead of adding a port number
sudo firewall-cmd --add-port=80/tcp --permanent
sudo firewall-cmd --permanent \
--add-forward-port=port=80:proto=tcp:toaddr=127.0.0.1:toport=8080

# allow incoming connections on port 443.
# You can also use --add-service=https instead of adding a port number
sudo firewall-cmd --add-port=443/tcp --permanent
sudo firewall-cmd --permanent \
--add-forward-port=port=443:proto=tcp:toaddr=127.0.0.1:toport=8443
sudo firewall-cmd --reload

内容引用：

https://www.jenkins.io/doc/book/system-administration/reverse-proxy-configuration-iptables/

Jenkins update center加速镜像配置

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1月 262021
 

安装阶段修改配置

[root@jenkins ~]# cd /var/lib/jenkins/
[root@jenkins jenkins]# cat hudson.model.UpdateCenter.xml 
<?xml version='1.1' encoding='UTF-8'?>
<sites>
<site>
<id>default</id>
<url>https://updates.jenkins.io/update-center.json</url>
</site>
</sites>[root@jenkins jenkins]#

[root@jenkins jenkins]# cat hudson.model.UpdateCenter.xml 
<?xml version='1.1' encoding='UTF-8'?>
<sites>
<site>
<id>default</id>
<url>https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json</url>
</site>
</sites>
[root@jenkins jenkins]#

使用阶段修改配置

PyCharm PyPI Mainland China 镜像源

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1月 052021
  
File -> Settings -> Project -> Python Interpreter -> Install -> Available Packages -> Manage Repositories

https://mirrors.163.com/pypi/simple/
https://mirrors.ustc.edu.cn/pypi/web/simple
https://pypi.tuna.tsinghua.edu.cn/simple
https://mirrors.aliyun.com/pypi/simple/

使用命令行查看当前网络出口公网IP信息

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12月 242020
  
https://ipinfo.io/developers
C:\Users\harveymei>curl ipinfo.io
{
"ip": "119.137.55.106",
"city": "Shenzhen",
"region": "Guangdong",
"country": "CN",
"loc": "22.5455,114.0683",
"org": "AS4134 CHINANET-BACKBONE",
"timezone": "Asia/Shanghai",
"readme": "https://ipinfo.io/missingauth"
}
C:\Users\harveymei>
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