报错：Error response from daemon: context deadline exceeded
解决步骤：
systemctl stop docker.service
cd /var/lib/docker
mv swarm/ swarmXX
systemctl start docker.service
docker swarm join --token SWMTKN-1-xxxxx-yyyyy x.x.x.x:2377
报错：Error response from daemon: context deadline exceeded
解决步骤：
systemctl stop docker.service
cd /var/lib/docker
mv swarm/ swarmXX
systemctl start docker.service
docker swarm join --token SWMTKN-1-xxxxx-yyyyy x.x.x.x:2377