Docker - simple FIX for Error response from daemon: toomanyrequests: You have reached your pull rate limit.

Problem:

[root@localhost ~]# docker pull openjdk:8-jdk-alpine
Error response from daemon: toomanyrequests: 
You have reached your pull rate limit. You may increase the limit by 
authenticating and upgrading: https://www.docker.com/increase-rate-limit

Solution:

Docker introducted limits for accounts. To solve this problem we need to login to docker hub before making docker pull.

Steps:

1. Create account on https://hub.docker.com/
2. Before docker pull, login to docker hub with your username and password.

Practical example how to login to docker hub

[root@localhost ~]# docker login --username=my_docker_username
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
[root@localhost ~]# docker pull openjdk:8-jdk-alpine
8-jdk-alpine: Pulling from library/openjdk
e7c96db7181b: Pull complete
f910a506b6cb: Pull complete
c2274a1a0e27: Pull complete
Digest: sha256:94792824df2df33402f201713f932b58cb9de94a0cd524164a0f2283343547b3
Status: Downloaded newer image for openjdk:8-jdk-alpine
docker.io/library/openjdk:8-jdk-alpine