[NGINX Webinar Forum] Tune health check parameter to reduce app down time slide
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The document discusses tuning NGINX health check parameters to reduce application downtime. It covers passive health checks, active health checks, and how to configure parameters like fail_timeout and max_fails. It also provides examples of defining custom health check conditions, mandatory checks, and persistent checks. Additional methods discussed for reducing downtime include using maintenance pages, custom error pages, and dynamically reloading configurations via API. The presentation aims to help optimize NGINX health checks and add robustness to applications.
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![https://www.digitalocean.com/community/tutorials/how-to-configure-nginx-to-use-custom-error-pages-on-ubuntu-14-04
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Tuning for reduce users experiences.
- NGINX Custom Error Pages.
server {
listen 80 default_server;
listen [::]:80 default_server ipv6only=on;
. . .
error_page 404 /custom_404.html;
location = /custom_404.html {
root /usr/share/nginx/html;
internal;
}
error_page 500 502 503 504 /custom_50x.html;
location = /custom_50x.html {
root /usr/share/nginx/html;
internal;
}](https://image.slidesharecdn.com/tunehealth-checkparametertoreduceappdowntimeslide-211008040928/85/NGINX-Webinar-Forum-Tune-health-check-parameter-to-reduce-app-down-time-slide-19-320.jpg)
[NGINX Webinar Forum] Tune health check parameter to reduce app down time slide
- 1. Tune Health-check Parameter to Reduce App Down Time Mr.Supachai Jaturaprom (Tum) Pre-sales Engineer CCIE#65006 (EI, DC written) Email: supachai@vstecs.co.th VSTECS (Thailand) Co.,Ltd. 1 NGINX Community Thailand.
- 2. Agenda: 2 • Application Health Checks Overview. • Health Checks of NGINX. • Tuning parameters of NGINX. • Demo Live. • Summary & Q&A.
- 5. What is Application Services. 5 Application Service Architectures Model of Code to Customer.
- 7. NGINX Load balancer work ? 7 https://www.nginx.com/blog/cloud-architectures/
- 8. Health Check in NGINX 8 • Passive Health-check • Active Health-check • Disable Health-check
- 9. Passive Health Checks. 9 Clients / Web Browser Internet / WAN Reverse Proxy, Load Balancer & Web Server Healthy Healthy Unhealthy - Error 5xx. - Error Connection refused. - Timeout
- 10. Active Health Checks. 10 Clients / Web Browser Internet / WAN Reverse Proxy, Load Balancer & Web Server Healthy Healthy Unhealthy Health check Health check Health check
- 11. Disable Health Checks. 11 Clients / Web Browser Internet / WAN Reverse Proxy, Load Balancer & Web Server Healthy always Healthy always Healthy always
- 12. https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#passive-health-checks 12 Passive Health Checks – Tuning • fail_timeout – Sets the time during which a number of failed attempts must happen for the server to be marked unavailable, and also the time for which the server is marked unavailable (default is 10 seconds). • max_fails – Sets the number of failed attempts that must occur during the fail_timeout period for the server to be marked unavailable (default is 1 attempt).
- 13. https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#passive-health-checks 13 Passive Health Checks – Tuning Server Slow Start - Slow start allows an upstream server to gradually recover its weight from zero to its nominal value after it has been recovered or became available backup - marks the server as a backup server. It will be passed requests when the primary servers are unavailable.
- 14. https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#active-health-checks 14 Active Health Checks – Tuning 1. Adding health_check directive in the location. Optionally you can specify another port for health checks.
- 15. https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#active-health-checks 15 Active Health Checks – Tuning 2. In the upstream server group, define a shared memory zone. Default for active health check parameter: - Interval = 5 seconds - Fails = 1 - Passes = 1 You can be overridden with parameters Specifying the Requested URI
- 16. https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#defining-custom-conditions 16 Active Health Checks – Tuning Defining Custom Conditions Example for Custom Conditions : - Status code - Header - Body
- 17. https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#defining-custom-conditions 17 Active Health Checks – Tuning Defining Mandatory Health Checks mandatory parameter requires every newly added server to pass all configured health checks before NGINX sends traffic to it. persistent parameter for health checks can be marked as persistent, so that the previous state is remembered when reloading configuration.
- 18. 18 Tuning for reduce users experiences. - Maintenance Web Page. server { listen 8099; ….. location / { return 200 “Temporary Maintenance, Please try this page again. } …..
- 19. https://www.digitalocean.com/community/tutorials/how-to-configure-nginx-to-use-custom-error-pages-on-ubuntu-14-04 19 Tuning for reduce users experiences. - NGINX Custom Error Pages. server { listen 80 default_server; listen [::]:80 default_server ipv6only=on; . . . error_page 404 /custom_404.html; location = /custom_404.html { root /usr/share/nginx/html; internal; } error_page 500 502 503 504 /custom_50x.html; location = /custom_50x.html { root /usr/share/nginx/html; internal; }
- 20. Live Demo. 20
- 21. 21 Summary NGINX Application Health Checks • Passive Health Checks. - NGINX OSS and NGINX Plus Support • Active Health Checks. - NGINX OSS add 3party module and NGINX Plus Support • Addon reduce apps method - NGINX health checks. - Backup parameter. - Customize error pages. - Dynamic reload configuration via API.
- 22. Resources Getting Started with NGINX Health Checks • http://nginx.org/en/docs/ • https://docs.nginx.com/nginx/admin-guide/load-balancer 22 NGINX Community Thailand. NGINX Plus Trial License • https://www.nginx.com/free-trial-request