[GitHub] [apisix] tzssangglass commented on issue #3917: request help: question about Prometheus memory consumption

[GitBox <gi...@apache.org>]

tzssangglass commented on issue #3917:
URL: https://github.com/apache/apisix/issues/3917#issuecomment-920947657


   > When I set prometheus-metrics as 100m in configmap apisix, apisix throw an error about key conflicted.
   > 
   > Apisix version is 2.7
   > 
   > ```
   >      http:
   >         lua_shared_dicts:              # add custom shared cache to nginx.conf
   >           prometheus-metrics: 100m 
   > ```
   > 
   > ```shell
   > /usr/local/openresty/luajit/bin/luajit ./apisix/cli/apisix.lua init
   > WARNING: using fixed Admin API token has security risk.
   > Please modify "admin_key" in conf/config.yaml .
   > /usr/local/openresty/luajit/bin/luajit ./apisix/cli/apisix.lua init_etcd
   > 2021/09/16 08:28:56 [emerg] 1#1: the size 104857600 of shared memory zone "prometheus-metrics" conflicts with already declared size 10485760 in /usr/local/apisix/conf/nginx.conf:64
   > nginx: [emerg] the size 104857600 of shared memory zone "prometheus-metrics" conflicts with already declared size 10485760 in /usr/local/apisix/conf/nginx.conf:64
   > ```
   
   This has nothing to do with 100m, the error logs have clearly indicated this to you.
   
   the shared dict `prometheus-metrics` has been already defined, see: https://github.com/apache/apisix/blob/d6c09fba6543c9fc28520ef7172596a01417222f/apisix/cli/ngx_tpl.lua#L171
   
   so you can not define shared dict with the same name(`prometheus-metrics`) in a custom configuration.
   


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