Decrease one node which involved in some docker swarm service without request fail.

 

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When a node is shut down in a Docker Swarm, you can reduce the number of nodes while maintaining the availability of services by following these steps:

1. Move the running services from the stopped node to another node. Use the command docker service update --move <service-name> to move the services to another node.

2. After the services have been moved, remove the stopped node from the Docker Swarm with the command docker node rm <node-name>.

3. Start the services again to maintain service availability. Use the command docker service update --force <service-name> to start the services again.

By following these steps, you can reduce the number of nodes while maintaining the availability of services. However, depending on the state of the services, availability may be temporarily reduced, so be careful. Also, it is recommended to back up before performing the above steps.

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docker swarm simple command

*install virtualbox

-+-

#install virtualbox on terminal

#osx

brew install virtualbox

#linux

sudo apt install virtualbox

-+-

 

* install docker-machine

...

#osx

curl -L https://github.com/docker/machine/releases/download/v0.16.2/docker-machine-`uname -s`-`uname -m` >/usr/local/bin/docker-machine && chmod +x /usr/local/bin/docker-machine

#linux

curl -L https://github.com/docker/machine/releases/download/v0.16.2/docker-machine-`uname -s`-`uname -m` >/tmp/docker-machine && chmod +x /tmp/docker-machine && sudo cp /tmp/docker-machine /usr/local/bin/docker-machine

...

*docker-machine

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#docker-machine basic cmd

docker-machine ls

docker-machine rm name

docker-machine kill name

docker-machine create name

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