Kebernetes - Error Case 1. failed to dial gRPC: cannot connect to the Docker daemon. Is 'docker daemon' running on this host?

발생 시점 : Dockerfile을 작성한 이후 docker build -t kuard-adm64:1 . 수행 후 아래와 같은 Error 발생 

Error Case : ERRO[0000] failed to dial gRPC: cannot connect to the Docker daemon. Is 'docker daemon' running on this host?: dial unix /var/run/docker.sock: connect: no such file or directory context canceled

문제 원인 : 위와 같은 Error 발생 시 Docker Daemon이 기동되어 있는지 여부를 확인합니다.

==> dockerd process 기동 여부
[root@kmkang kuber]# ps -ef | grep dockerd
root      7301  6565  0 14:05 pts/2    00:00:00 grep --color=auto dockerd
[root@kmkang kuber]#

해결 방법 : dockerd process 기동

==> dockerd process 기동 방법
[root@kmkang kuber]# service docker start
Redirecting to /bin/systemctl start  docker.service
[root@kmkang kuber]# ps -ef | grep dockerd
root      7327     1  1 14:05 ?        00:00:00 /usr/bin/dockerd
root      7439  6565  0 14:05 pts/2    00:00:00 grep --color=auto dockerd
[root@kmkang kuber]#
이후 다시 docker build를 수행하면 정상적으로 수행됩니다.