Service Status
This status page shows whether my servers and services (Ken's Study Journey, Planner and Newsletter) are running normally.
I pay my maximum effort to keep my services running and reduce outages and interruptions. However, I cannot guarantee that my services run 100% correctly.
For bugs and other issues, please see update logs.
If you are experiencing bugs and issues, you can report them by contacting me.
HTTP Servers Sometimes are Running Slowly
Update: Ken's Study Journey has urgently replaced the HTTP Server software module in all Core (C) Servers.
2 May 2024 22:10 (GMT+8)
Update: Based on observations for several hours, the CPU usage fluctuates, moving to low (near 0%) and high (near 100%) levels very often.
2 May 2024 19:40 (GMT+8)
Update: Based on my further investigation, this is caused by the high CPU usage waiting for I/O (not in "used" state, but in "wait" state).
2 May 2024 13:50 (GMT+8)
Identified: I now discovered the cause of this issue.
The server memory is not being used properly (HTTP servers run slowly despite a very small memory usage). This is probably due to an incorrect server setting.
2 May 2024 08:20 (GMT+8)
Discovered: In recent days, I discovered that the Guangzhou (CN-CAN) HTTP web servers are running slowly (including Edge and Core Servers) when there are many visitors/users.
I am going to investigate and fix this issue in my free time.
2 May 2024 08:15 (GMT+8)
In the Last 365 Days
Uptime: 99.99%
Total Downtime: 30 minutes
The "Uptime" displayed below are the status for the last 365 days.
Server Nodes
So far, I have 4 servers in total around the world, improving my website performance and stability for users in different locations.
| CN-CAN-E-01 | Normal | Uptime: 100% |
| CN-CAN-E-02 | Normal | Uptime: 100% |
| CN-HKG-E-01 | Normal | Uptime: 100% |
| CN-HKG-E-02 | Normal | Uptime: 100% |
| CN-CAN-C-01 | Normal | Uptime: 99.5% |
| CN-CAN-C-02 | Degraded Performance | Uptime: 100% |
Core Modules
| HTTPS and HSTS | Normal | Uptime: 100% |
| Cookies banner | Normal | Uptime: 100% |
| Dark Mode | Normal | Uptime: 100% |
| DNS and Load-balancer | Normal | Uptime: 100% |
| Database | Normal | Uptime: 100% |
| IPv6 | Normal | Uptime: 92% |
| HTTP Web Server | Degraded Performance | Uptime: 100% |
| Email System | Normal | Uptime: 99% |
| Web-Application Firewall (WAF) | Normal | Uptime: 100% |
| Statistics and Logging | Normal | Uptime: 99.9% |
Ken’s Study Journey
| Ken's Study Journey Website | Normal | Uptime: 100% |
| Comment Form | Under Maintenance (temporarily turned off) | Uptime: 0% |
| Like/Dislike | Normal | Uptime: 100% |
| Audio Articles | Normal | Uptime: 100% |
| Articles | Normal | Uptime: 97.5% |
| RSS Subscription | Normal | Uptime: 100% |
Ken’s Study Planner
| Ken's Study Planner Website | Degraded Performance | Uptime: 99% |
| Sign up Form (New Users) | Normal | Uptime: 98% |
| Login Form | Normal | Uptime: 99.95% |
| Daily Goals Checklist | Normal | Uptime: 100% |
| Projects/Events Manager | Normal | Uptime: 97.8% |
| Days Left Counter | Normal | Uptime: 100% |
| Schedule and Lessons | Normal | Uptime: 97% |
| Checklists | Normal | Uptime: 100% |
| iCalendar Subscription API | Normal | Uptime: 99% |
| HTTP JSON API | Normal | Uptime: 100% |
Ken’s Study IoT (Coming Soon)
| Ken's Study IoT Website | Under Maintenance (Coming Soon) | Uptime: 0% |
| Management Interface | Under Maintenance (Coming Soon) | Uptime: 0% |
| Management API | Under Maintenance (Coming Soon) | Uptime: 0% |
| Device Linking API | Under Maintenance (Coming Soon) | Uptime: 0% |
Email and Newsletter
| Email System | Degraded Performance | Uptime: 99% |
| Newsletter Subscription System | Normal | Uptime: 98.5% |
| Subscription Form (New Users) | Normal | Uptime: 99.8% |
| Email Unique Code System | Normal | Uptime: 99% |
Scheduled Maintances
I have been using a new invented technology which does not majorly interrupt the services during maintenances. The services are only interrupted for less than 30 seconds.
There are no scheduled maintenances.
Past Incidents
The following shows the errors and outages in the past 14 days on my services.
Please wait patiently while I am addressing some technical issues.
All times listed below are in GMT+8 (China Standard Time) time zone.
3 May 2024
No incidents reported today.
2 May 2024
HTTP Servers Sometimes are Running Slowly
Update: Ken's Study Journey has urgently replaced the HTTP Server software module in all Core (C) Servers.
2 May 2024 22:10 (GMT+8)
Update: Based on observations for several hours, the CPU usage fluctuates, moving to low (near 0%) and high (near 100%) levels very often.
2 May 2024 19:40 (GMT+8)
Update: Based on my further investigation, this is caused by the high CPU usage waiting for I/O (not in "used" state, but in "wait" state).
2 May 2024 13:50 (GMT+8)
Identified: I now discovered the cause of this issue.
The server memory is not being used properly (HTTP servers run slowly despite a very small memory usage). This is probably due to an incorrect server setting.
2 May 2024 08:20 (GMT+8)
Discovered: In recent days, I discovered that the Guangzhou (CN-CAN) HTTP web servers are running slowly (including Edge and Core Servers) when there are many visitors/users.
I am going to investigate and fix this issue in my free time.
2 May 2024 08:15 (GMT+8)
1 May 2024
No incidents reported.
30 Apr. 2024
No incidents reported.
29 Apr. 2024
No incidents reported.
28 Apr. 2024
No incidents reported.
27 Apr. 2024
No incidents reported.
26 Apr. 2024
No incidents reported.
25 Apr. 2024
No incidents reported.
24 Apr. 2024
No incidents reported.
23 Apr. 2024
No incidents reported.
22 Apr. 2024
No incidents reported.
21 Apr. 2024
No incidents reported.
20 Apr. 2024
No incidents reported.
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