docker学习的问题3--Error response from daemon: This node is not a swarm manager.
问题：[root@docker ~]# docker network create -d overlay --subnet 172.16.1.0/24 --gateway 172.16.1.254 ol1Error response from daemon: This node is not a swarm manager. Use "docker swarm init" or "docker s
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问题：
[root@docker ~]# docker network create -d overlay --subnet 172.16.1.0/24 --gateway 172.16.1.254 ol1
Error response from daemon: This node is not a swarm manager. Use "docker swarm init" or "docker swarm join" to connect this node to swarm and try again.
解决办法：
[root@docker ~]# vim /usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd --containerd=/run/containerd/containerd.sock #修改这一行内容
[root@docker ~]# systemctl daemon-reload
[root@docker ~]# systemctl restart docker
验证：
[root@docker ~]# docker network create -d overlay --subnet 172.16.0.0/24 --gateway 172.16.0.254 ol1
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