Add the following:
If you’re using WireGuard on Ubuntu and notice that your wg0 interface
does not start automatically after reboot, you’re not alone. This is a common issue—and fortunately, an easy one to fix.
🚨 Problem
After rebooting your Ubuntu system, the WireGuard interface wg0 is down,
even though it worked perfectly before restarting.
🤔 Why This Happens
When you manually start WireGuard using:
sudo wg-quick up wg0
it only activates the VPN for the current session. It does not persist across reboots
because the service has not been enabled in systemd.
✅ Solution: Enable WireGuard Auto-Start
To ensure WireGuard starts automatically when your system boots, run:
sudo systemctl enable wg-quick@wg0
sudo systemctl start wg-quick@wg0
This registers WireGuard as a system service and ensures wg0 starts at boot.
🔍 Verify It’s Working
sudo systemctl status wg-quick@wg0
ip a show wg0
If everything is configured correctly, you should see the interface active.
⚠️ Common Issues & Fixes
1. Incorrect Config File Location
Ensure your configuration file exists at:
/etc/wireguard/wg0.conf
2. File Permissions
sudo chmod 600 /etc/wireguard/wg0.conf
3. Network Not Ready at Boot
Sometimes WireGuard starts before the network is fully initialized.
Fix this by delaying startup:
sudo systemctl edit wg-quick@wg0
[Unit]
After=network-online.target
Wants=network-online.target
sudo systemctl daemon-reexec
4. DNS Issues
If you’re using the DNS= option in your config, ensure your system supports it
(e.g., systemd-resolved or resolvconf).
📊 Diagram: How WireGuard Startup Works
┌───────────────┐
│ System Boot │
└──────┬────────┘
│
▼
┌──────────────────────┐
│ systemd initializes │
└──────┬───────────────┘
│
▼
┌──────────────────────────────┐
│ wg-quick@wg0.service enabled?│
└──────┬───────────────┬───────┘
│ YES │ NO
▼ ▼
┌───────────────┐ ┌──────────────┐
│ Start wg0 VPN │ │ wg0 stays OFF│
└───────────────┘ └──────────────┘
📌 Summary
systemctl enable wg-quick@wg0
💡 Final Thoughts
Enabling WireGuard at boot ensures your VPN connection is always active without manual intervention.
This is especially important for servers, remote access setups, and privacy-focused configurations.
Author: Gerard Chen
-
WireGuard wg0 Not Starting After Reboot on Ubuntu
- Problem: wg0 not starting after reboot
- Cause: Service not enabled
- Fix:
-
Cyber Zootopia log 首席管理員的「數碼寶貝飼養日記」
這是一份來自 Cyber Zootopia 首席管理員的「數碼寶貝飼養日記」。
記錄如何由 0 到 1，召喚並培育數碼寶貝。同時，為了使牠們未來能華麗變身為超級神獸，我同步開闢了專屬的訓練場（Playground）。寄望這些神獸能覺醒「隱藏特性」，代為處理日常生活及工作中的瑣事。究竟這場賽博實驗能進化到什麼程度？就讓我們從這一刻開始，持續觀察記錄下去。
-
mairadb command, basic 101
# create database CREATE DATABASE `databaseName`; # create user CREATE USER 'my_user'@'localhost' IDENTIFIED BY 'your_strong_password'; # grant privileges GRANT ALL PRIVILEGES ON my_new_database.* TO 'my_user'@'localhost'; FLUSH PRIVILEGES;# in docker docker exec -it container_name mariadb -u root -p # Create the Database CREATE DATABASE `dbName`;# Create the User (Using '%' so you can connect from outside the container) CREATE USER 'userName'@'%' IDENTIFIED BY 'userPassword'; # Grant Permissions GRANT ALL PRIVILEGES ON `dbName`.* TO 'dbUser'@'%';# Apply changes FLUSH PRIVILEGES; # Exit the prompt EXIT; -
erpNEXT, “Multi-Bench, Multi-Tenant” architecture setting
Bench Name (Domain) Internal Port Project alpha.com alpha.com 8000 alpha beta.com beta.com 8001 beta gamma.com gamma.com 8002 gamma Initialize the Bench
# Replace 'alpha.com' with your actual domain bench init alpha.com --frappe-branch version-15 cd alpha.com -
GitLab deploy by using docker yml
結論
GitLab真的超吃資源，沒有優化的情況下，要佔用10.9G的RAM。只有自己用，現在RAM的價格，又跟黃金差不多。可能GitLab功能很強，現階段不適用。ChatGPT建議改用Gitea，就來試試看。
-
enlarge docker space
問題：Your Docker build environment ran out of disk space.
# 檢查 docker 狀態
df -h docker system df# 清理docker 空間
# Remove all unused data docker system prune -a --volumes # Remove build cache docker builder prune -a # Check again df -h問題：變更docker 位置
# Stop Docker sudo systemctl stop docker # Edit Docker config sudo nano /etc/docker/daemon.json# add the following code in daemon.json { "data-root": "/new/docker/path" }# Create new directory sudo mkdir -p /new/docker/path # Move existing data (optional) sudo rsync -aP /var/lib/docker/ /new/docker/path/ # Start Docker sudo systemctl start docker -
Open-Source Workflow/Automation Tools
Ranked by Popularity
- n8n — Very Popular
- Widely used for general workflow automation with a visual builder.
- Large community and many integrations.
- Often ranked #1 in workflow tool lists.
- Node-RED — Highly Popular
- Strong open-source user base, especially for IoT and integration workflows.
- Long history and strong community.
- Apache Airflow — Very Popular (in data/engineering)
- Dominant in data engineering and complex scheduled pipelines; huge adoption in enterprise data teams.
- Activepieces — Fast-Growing
- Newer but rapidly rising in many “top open-source automation” lists.
- Growing ecosystem and community interest.
- Huginn — Popular Niche Tool
- Known in self-hosted automation communities for event-based agents.
- Windmill — Emerging
- Increasingly included in open-source automation tool lists; still smaller compared to older players.
- Kestra — Growing
- Gaining attention for scalable orchestration, less mainstream than Airflow but rising.
Ranked with Brief Comments
Rank Tool Why it’s popular 1 n8n General workflow automation; strong community; visual UI. 2 Node-RED Mature, widely used in IoT and integrations; broad ecosystem. 3 Apache Airflow Very popular in data engineering and ETL use cases. 4 Activepieces Newer but rapidly adopted; mentioned in many 2025 tool lists. 5 Huginn Known in privacy-focused and scriptable automation circles. 6 Windmill Emerging workflow tool, gaining traction. 7 Kestra Growing in developer orchestration space. - n8n — Very Popular
-
GPT 比較：chatGPT、Gemini、Claude
Claude
# Pron
在APP佈署上，真的比較強。應該是系統內部，內建系統prompts羅輯就比較精細。
# Cron
“You’ve used 75% of your weekly limit”
“You’ve used 75% of your monthly limit”
一堆的token使用量限制，只要超過資費的token使用上限 (日限制 / 週限制 / 月限制)，要嘛就等到限制被解除，要嘛就升級方案，就是要多付錢)Gemini
# Pron
# Cron
chatGPT
# Pron
# Cron