vi /lib/systemd/system/docker.service
[Service]
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --data-root=/docker --exec-opt native.cgroupdriver=systemd
...중략...
# 아래 부분을 추가한다.
Environment="BUILDKIT_STEP_LOG_MAX_SIZE=1073741824"
Environment="BUILDKIT_STEP_LOG_MAX_SPEED=10240000"