By default, the manager node generates a new root Certificate Authority (CA) along with a key pair, which are used to secure communications with other nodes that join the swarm. The docker-stack.yml in the current folder will be used to deploy the voting app as a stack.Ensure you are in the first terminal and do the below:Note: being able to create a stack from a docker compose file is a great feature added in Docker 1.13.The output should be the following one.
Having multiple replicas means an instant takeover to the remaining replicas without any restart.When Docker publishes a port for a service, it does so by You can also create a service first and scale up later — lets deploy nginxYou can now simply check if Redis is responding on all nodes, despite the fact its only running on swarm1 and swarm2.This setup consists of multiple components: secrets, network, MariaDB Database service and WordPress service.Lets create the passwords for the root database and the wordpress database first and store them as a secret available on every Swarm node.Now we need a network connectivity across the cluster.If you visit any Docker Swarm node on Port 80 you should see the WordPress installer.sudo apt install apt-transport-https ca-certificates curl software-properties-commoncurl -fsSL # sudo vi /etc/hosts 192.168.0.12 swarm1 manager1 192.168.0.14 swarm2 worker1 192.168.0.15 swarm3 worker2docker swarm join --token SWMTKN-1-54hsijoskp3urbgeni9fqzz35yjzg527lvxxkg5qdg4ce7dqyz-bf1sladxf3t5v5wtl9droybdc 192.168.0.12:2377docker service create --name redis --replicas 2 --publish 6379:6379 redis# start with one service docker service create --name nginx-web --publish 8080:80 nginx# scale out to 3 replicas docker service scale nginx-web=3docker service ls ID NAME MODE REPLICAS IMAGE PORTS 8a0wumpvlm7u nginx-web replicated 3/3 nginx:latest *:8080->80/tcp hya01a0hl6k0 redis replicated 2/2 redis:latest *:6379->6379/tcpredis-cli -h 192.168.0.12 -p 6379 redis-cli -h 192.168.0.14 -p 6379 redis-cli -h 192.168.0.15 -p 6379openssl rand -base64 20 | docker secret create root_db_password - openssl rand -base64 20 | docker secret create wp_db_password -docker service create --name mariadb --replicas 1 --constraint=node.role==manager --network wordpress-net --secret source=root_db_password,target=root_db_password --secret source=wp_db_password,target=wp_db_password -e MYSQL_ROOT_PASSWORD_FILE=/run/secrets/root_db_password -e MYSQL_PASSWORD_FILE=/run/secrets/wp_db_password -e MYSQL_USER=wp -e MYSQL_DATABASE=wp mariadb:10.1docker service create --name wp --constraint=node.role==worker --replicas 1 --network wordpress-net --publish 80:80 --secret source=wp_db_password,target=wp_db_password,mode=0400 -e WORDPRESS_DB_USER=wp -e WORDPRESS_DB_PASSWORD_FILE=/run/secrets/wp_db_password -e WORDPRESS_DB_HOST=mariadb -e WORDPRESS_DB_NAME=wp wordpress:4.7
This is great feature as it allows a lot of flexibility. Use "docker swarm init" or "docker swarm join" to connect this node to swarm and try again. The first accesses the swarm Let’s create a Docker Swarm first. Let’s reflect that within the hosts file (of course dns is preferable, but doesn’t matter so much in a test environment).You might notice that we named 192.168.0.12 manager1 — please run the following command only on the manager nodeRun the following command on the 2 worker nodes, based on the output of the docker swarm init command.You can always check your Docker Swarm cluster and how many nodes are available using Use docker service ls to check the running services: As Docker is now managing a host cluster for container services and not a single host engine, you need to deploy container (services) in a different way.
E.g.
If Swarm isn’t running, simply type docker swarm init in a shell prompt to set it up. With a single host with a swarm that has been created with init, the host gets networks created etc. Now that we’ve demonstrated that the individual components of our application run as stand-alone containers and shown how to deploy it using Kubernetes, let’s look at how to arrange for them to be managed by Docker Swarm. On a host running Docker Engine 1.12 or later, run the following command: # docker swarm init --advertise-addr IP Address:PORT Substitute IP Address with the IP address or device name of the network interface that manager nodes should use to communicate between each other and to facilitate overlay networking. And it returns a nonzero exit code $ echo $? Lets deploy a redis database as a service with 2 replicas.A replica is a kind of an instance. Once a swarm has been initialized from a manager node, other hosts can be added to the swarm as workers with another simple command: C:\> docker swarm join --token
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