Do i have to intall both sonarr and aira2 into the docker?

i use openwrt aria2 is not in the docker, sonarr is in the docker, aria2 works well. but sonnar unable to connect with aria2.

anyone know the reason?

Not with the information you have provided. how are you trying to make sonarr connect with aria2?

side note, we support the container, not the application. Sonarr has its own support.