启动报错：
]# systemctl start docker Job for docker.service Failed because start of the service was attempted too often. See "systemctl status docker.service" and "journalctl -xe" for details. To force a start use "systemctl reset-Failed docker.service" followed by "systemctl start docker.service" again. ]# journalctl -xe 2月 25 17:48:31 host-flb systemd[1]: docker.service holdoff time over, scheduling restart. 2月 25 17:48:31 host-flb systemd[1]: Stopped Docker Application Container Engine. -- Subject: Unit docker.service has finished shutting down -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.service has finished shutting down. 2月 25 17:48:31 host-flb systemd[1]: Closed Docker Socket for the API. -- Subject: Unit docker.socket has finished shutting down -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.socket has finished shutting down. 2月 25 17:48:31 host-flb systemd[1]: Stopping Docker Socket for the API. -- Subject: Unit docker.socket has begun shutting down -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.socket has begun shutting down. 2月 25 17:48:31 host-flb systemd[1]: Starting Docker Socket for the API. -- Subject: Unit docker.socket has begun start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.socket has begun starting up. 2月 25 17:48:31 host-flb systemd[1]: Listening on Docker Socket for the API. -- Subject: Unit docker.socket has finished start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.socket has finished starting up. -- -- The start-up result is done. 2月 25 17:48:31 host-flb systemd[1]: Starting Docker Application Container Engine... -- Subject: Unit docker.service has begun start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.service has begun starting up. 2月 25 17:48:31 host-flb dockerd[29067]: unable to configure the Docker daemon with file /etc/docker/daemon.json: EOF 2月 25 17:48:31 host-flb systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE 2月 25 17:48:31 host-flb systemd[1]: Failed to start Docker Application Container Engine. -- Subject: Unit docker.service has Failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.service has Failed. -- -- The result is Failed. 2月 25 17:48:31 host-flb systemd[1]: Unit docker.service entered Failed state. 2月 25 17:48:31 host-flb systemd[1]: docker.service Failed.
问题原因：
创建了配置文件/etc/docker/daemon.json，但此文件为空
解决方案：
1、删除/etc/docker/daemon.json文件，执行systemctl reset-Failed docker.service；systemctl start docker
2、向/etc/docker/daemon.json文件中写入如下内容
然后执行ystemctl reset-Failed docker.service；systemctl start docker
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