docker是yum安装版本是19.03.5
yum安装的此版本/etc/docker/并没有daemon.json文件
然后修改vim /usr/lib/systemd/system/docker.service
#在ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock 后加--insecure-registry 10.200.10.10:5000
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --insecure-registry 10.200.10.10:5000
systemctl daemon-reload
systemctl restart docker
docker login 10.200.10.10:5000 还是报错5000: connect: connection refused
然后在/etc/docker/添加daemon.json文件
{ "insecure-registries":["10.200.10.10:5000"] }
systemctl daemon-reload
systemctl restart docker
docker 启动不了
查找报错后发现此版本/etc/docker的文件名得写成daemon.json.rpmsave
/etc/docker/daemon.json.rpmsave
systemctl daemon-reload
systemctl restart docker
测试ok
docker dial tcp 10.200.10.10:5000: connect: connection refused
原文：https://www.cnblogs.com/rutor/p/12014727.html