Centos on Margrop Blog

Auto-Add N2N Route Table on CentOS 7 Boot

Sun, 06 Feb 2022 19:50:38 +0800

1. Edit the `systemctl` Auto-Start File

vim /etc/systemd/system/n2route.service

Issue where pip becomes unusable after pip install --upgrade pip on CentOS 7: ImportError: No module named typing

Wed, 16 Jun 2021 11:13:46 +0800

Problem Description

pip安装某第三方 SDK，提示升级 pip，按提示升级 pip 后报错

pip Upgrade Command that Causes the Error

pip install --upgrade pip

pip Error Message

Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    load_entry_point('pip==21.1.2', 'console_scripts', 'pip')()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/site-packages/pip/__init__.py", line 1, in <module>
    from typing import List, Optional
ImportError: No module named typing

CentOS 7.4 NFS Auto-Mount

Wed, 17 Feb 2021 21:15:19 +0800

On-Demand Auto-Mount

Automatically mount NFS shared directory /home/share to local path /mnt/share upon user login

yum install -y autofs
vi /etc/auto.master
/mnt /etc/auto.conf（这个配置文件本身就没有要自己创建）
vi /etc/auto.conf
share  192.168.1.22:/etc/letsencrypt/live/margrop.net-0001/（nfs服务器上共享文件）
service autofs restart

How to Install Node-RED with NPM

Mon, 01 Feb 2021 09:57:07 +0800

What Is `Node-RED`

Node-RED is a low-code/no-code programming tool for connecting hardware devices, APIs, and online services in a novel and interesting way. It is especially suitable for smart home scenarios.

Node-RED provides a browser-based flow editor, making it easy to connect various nodes in the panel. You can then deploy the flow to runtime with a single click.

How to Build an Open Source Web Flowchart Tool Diagrams.net (formerly draw.io)

Sat, 30 Jan 2021 17:59:08 +0800

ProcessOn are now well-known web 流程图, UML drawing tools. However, ProcessOn is a paid service with too many free-tier restrictions. So, is there a free option available?

Yes, it’s Diagrams.net. Completely free with powerful features~

Upgrading or Fresh Installing MariaDB 10.5 on CentOS 7 Using Aliyun Mirror

Fri, 29 Jan 2021 15:42:20 +0800

Update the System First

yum update -y

Edit the yum Configuration File Using Aliyun Mirror

Here MariaDB 10.5 is used as an example

vim /etc/yum.repos.d/MariaDB10.repo

#http://downloads.mariadb.org/mariadb/repositories/
[mariadb]
name = MariaDB
baseurl = https://mirrors.aliyun.com/mariadb/yum/10.5/centos7-amd64
gpgkey = https://mirrors.aliyun.com/mariadb/yum/RPM-GPG-KEY-MariaDB
gpgcheck = 1

Installing Docker on CentOS 7 and Configuring Aliyun Mirror Source

Fri, 29 Jan 2021 11:40:18 +0800

Docker Version

Since Docker version 1.13, Docker has adopted a timeline-based versioning approach, dividing releases into Community Edition (CE) and Enterprise Edition (EE). Docker CE is the free community edition, while Docker EE is the paid enterprise version.

Installing the Latest Version of Node and NPM on CentOS 7

Wed, 27 Jan 2021 11:28:59 +0800

Downloading Node:

The download uses the Aliyun mirror

mkdir ~/nodejs
cd ~/nodejs
wget https://npm.taobao.org/mirrors/node/latest-v15.x/node-v15.7.0-linux-x64.tar.gz
tar -xvzf node-v15.7.0-linux-x64.tar.gz

Installing Frp Client on CentOS with SSH Access

Sat, 23 Jan 2021 17:22:58 +0800

Download and Extract Frp

Latest Frp download address: https://github.com/fatedier/frp/releases/

mkdir ~/frp
cd ~/frp
wget https://github.com/fatedier/frp/releases/download/v0.35.0/frp_0.35.0_linux_amd64.tar.gz
tar -xvzf frp_0.35.0_linux_amd64.tar.gz

How to Run N2N on CentOS 7 — Edge Edition

Sat, 16 Jan 2021 14:00:18 +0800

边缘节点（node）：The node that will become part of the virtual network.

How to use CentOS 7 to run N2N—supernode

Fri, 15 Jan 2021 09:15:03 +0800

超级节点（supernode）: It allows edge nodes to announce and discover other nodes. It must have a port that is publicly accessible on the Internet. First review the basic elements of n2n n2n is a lightweight VPN software that makes it easy to create virtual networks that bypass intervening firewalls. In order to start using n2n, two elements are required: 一个超级节点（supernode）: It allows edge nodes to announce and discover other nodes. It must have a port that is publicly accessible on the Internet.