Nginx cache api delete
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The document describes how to implement an API in Nginx to delete a specific cached file by URI. It explains that Nginx caches files based on an MD5 hash of the request URI. A Lua script is used to take the URI as input, calculate the hashed file path, and delete it using the OS remove command. The script returns a JSON response indicating if the file was successfully deleted. While this approach works, the author later found a simpler existing solution for purging cached items in Nginx using Lua.
Nginx cache api delete
- 1. Nginx Cache Delete API I want to use Nginx cache delete api. Yuki Iwamoto 02/12/2019
- 2. Who am I? Yuki Iwamoto Freelance Engineer Quitting smoking (40days)
- 3. Im searching for a Nginx function Delete cache function Only one uri (Not all cache)
- 4. Example I want to delete only this uri cache. http://localhost/entry/11/112233 Sending request like this, then delete /entry/11/112233 cache http://localhost:8080/cache_clear_uri/entry/11/112233
- 5. About nginx cache File name is md5 hashed from proxy_cache_key The 鍖rst folder would be the last (n) character from levels in proxy_cache_path 鍖nd and delete the 鍖le
- 6. proxy_cache_path /data/nginx/cache/yi levels=1:1:2 keys_zone=yi:256m max_size=100g inactive=7d; proxy_cache_key $uri"; server { listen 8080 default_server; server_name localhost; location ~ /cache_clear_uri/(.*) { set $cache_uri $1; content_by_lua ' local cjson = require cjson" local cache_base_path = "/data/nginx/cache/yi" local cache_uri = "/" .. ngx.var.cache_uri local uri_md5 = ngx.md5( cache_uri ) local 鍖rst_path = string.sub( uri_md5, -1, -1 ) local second_path = string.sub( uri_md5, -2,-2 ) local third_path = string.sub( uri_md5, -4, -3 ) local cache_鍖le = cache_base_path .. "/" .. 鍖rst_path .. "/" .. second_path .. "/" .. third_path .. "/" .. uri_md5 local code = os.execute( "/bin/rm " .. cache_鍖le ) ngx.say(cjson.encode({ code = code , cache_鍖le = cache_鍖le })) ngx.header.content_type = "application/json; charset=utf-8" '; } }
- 7. (.*) = ($1) setting to cache_uri set $cache_uri $1;
- 8. When proxy_cache_key is uri, this case is only uri proxy_cache_key $uri";
- 9. Convert uri to md5 local uri_md5 = ngx.md5( cache_uri )
- 10. The 鍖rst folder would be the last (1) character (from -1 to -1) from levels in proxy_cache_path local 鍖rst_path = string.sub( uri_md5, -1, -1 ) The second folder would be the last (2) character(from -2 to -2) from levels in proxy_cache_path local second_path = string.sub( uri_md5, -2,-2 ) The third folder would be the last (3) character (from -3 to -4) from levels in proxy_cache_path local third_path = string.sub( uri_md5, -4, -3 )
- 11. Delete by os.execute ( rm command ) local code = os.execute( "/bin/rm " .. cache_鍖le )
- 12. Return json (delete or not , and which 鍖le) ngx.say(cjson.encode({ code = code , cache_鍖le = cache_鍖le })) ngx.header.content_type = "application/json; charset=utf-8" { code:0, cache_鍖le: /data/nginx/cache/yi/ab/0/1/123ab456cd789ef } Json result example
- 13. I found a better solution https://scene-si.org/2016/11/02/purging-cached- items-from-nginx-with-lua/
- 14. Conclusion We can do something by Lua Sometimes, dif鍖cult to 鍖nd a good solution