docker_swarm.txt

#To start docker swarm and listen on all the interfaces of the machine
docker daemon -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock &
# To initialise a swarm 
docker swarm init --advertise-addr 192.168.99.121
# To Join the swarm as manager 

# Join swarm as node
 docker swarm join \
    --token SWMTKN-1-3tv9ndtw9l9m5zhtrm2vp50b9597i3z6huhkam5cie4es0y353-6ir6bb0ht985c1dqoa1bvfggz \
    192.168.1.102:2377
# List nodes in the swarm
docker node list
# To drain manager so that tasks are not assigned to it
docker node update --availability drain manager0

root@Manager0:~# docker node list
ID                           HOSTNAME  STATUS  AVAILABILITY  MANAGER STATUS
2of7g9psv8u2jls6jjwpa3dqo *  Manager0  Ready   Active        Leader
5fv4xd7zk191rp8mciwshym0l    Node1     Ready   Active        
6iwa81l5ss5gaupxwrz9i6f3c    Node0     Ready   Active        
root@Manager0:~# docker node update --availability drain Manager0
Manager0
root@Manager0:~# docker node list
ID                           HOSTNAME  STATUS  AVAILABILITY  MANAGER STATUS
2of7g9psv8u2jls6jjwpa3dqo *  Manager0  Ready   Drain         Leader
5fv4xd7zk191rp8mciwshym0l    Node1     Ready   Active        
6iwa81l5ss5gaupxwrz9i6f3c    Node0     Ready   Active        

# Listing services in docker swarm
docker service ls
# Create service in docker swarm
Error: image library/service:latest not found
root@Manager0:~# docker service create --name du centos du 
f2xwvptlqhabodnjn4j4t0fj4
root@Manager0:~# 
root@Manager0:~# 
root@Manager0:~# docker service ls
ID            NAME  REPLICAS  IMAGE   COMMAND
f2xwvptlqhab  du    0/1       centos  du

# Scale up services
docker service scale helloworld=5
# Running a webservice in docker swarm 
docker service create --replicas 2 --name www-service --publish 80:80/tcp www_server

#Autoscaling test
  270  docker build -t hello-service . 
  271  docker images
  272  docker run hello-service:latest
  274  docker images
  280  docker build -t hello-service . 
  281  docker service
  282  docker service scale
  283  docker service scale hello-service=10
  288  docker service update
  289  docker ps 
  290  docker service update
  291  docker service update --help
  292  docker service update --image hello-service:latest hello-service
  293  docker ps
  297  docker build -t hello-service:v1.2 . 
  298  docker service update --image hello-service:v1.2 hello-service
  299  docker service ps
  300  docker service ps hello-service
  301  docker service scale hello-service=2
  302  docker service ps hello-service
  303  docker service ps 
  308  docker service ps hello-service 
  311  docker build -t hello-service:v1.3 . 
  313  docker service update --image hello-service:v1.3 hello-service