The nginx ingress controller does not start

The nginx ingress controller failed to start.

Symptoms

The following error message is displayed in the Docker logs:

epoll_create() failed (24: Too many open files)

Causes

The number of open files exceeded the system limit. By default, no more than 1024 files can be open. You can check the open file limit by running the ulimit -n command.

Resolving the problem

1. Open the docker.service file and add the following code:

   LimitNOFILE=infinity
   LimitNPROC=infinity
   LimitCORE=infinity
   

2. Restart Docker.

   docker restart