docker swarm instruction

README.md

Commands

References

• https://semaphoreci.com/community/tutorials/updating-services-in-a-docker-swarm-mode-cluster

Setup server

curl https://raw.githubusercontent.com/wklken/vim-for-server/master/vimrc > ~/.vimrc
apt-get install nfs-common
# install netshare
wget https://github.com/ContainX/docker-volume-netshare/releases/download/v0.36/docker-volume-netshare_0.36_amd64.deb
dpkg -i docker-volume-netshare_0.36_amd64.deb
service docker-volume-netshare start

Manager nodes

# Manager nodes
docker swarm init --advertise-addr=10.130.8.86
# show join-token
docker swarm join-token manager
docker swarm join-token worker
docker node ls

# deloy service 
docker service create --replicas 1 --name helloworld alpine ping docker.com
docker service remove helloworld
# Update services with latest image
docker service update --image registry.gitlab.com/nginx $SERVICE_NAME
docker service update --image kong:latest $SERVICE_NAME
# Update service when config change

# Restart kong
docker service update dev_kong-gw --args "kong restart"

Worker nodes

docker swarm join --token SWMTKN-1-4brkd51qcudi543dpgb0rhc7bhfogkkacw2n5374fc0wxhuaf2-68a79g11qbrtgztkvj58fep4w 10.130.8.86:2377
docker swarm leave

Working with docker stack

cd $WORKING_DIR
export STACK_NAME=dev
docker stack deploy $STACK_NAME -c stack.yml --with-registry-auth

Troubleshoting

docker service ps --no-trunc $SERVICE_NAME
docker service logs $SERVICE_NAME

install_docker_ubuntu.sh

#!/bin/bash
apt update
apt install -y apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
apt update
apt-cache policy docker-ce
apt install -y docker-ce

kong.yml

_format_version: "1.1"

services:
  - name: todo-service
    url: https://jsonplaceholder.typicode.com/todos
    routes:
      - name: todo-route
        paths:
          - /todos

landscape-sysinfo.sh

#!/bin/sh
cores=$(grep -c ^processor /proc/cpuinfo 2>/dev/null)
[ "$cores" -eq "0" ] && cores=1
threshold="${cores:-1}.0"
if [ $(echo "`cut -f1 -d ' ' /proc/loadavg` < $threshold" | bc) -eq 1 ]; then
    echo
    echo -n "  System information as of "
    /bin/date
    echo
    /usr/bin/landscape-sysinfo
else
    echo
    echo " System information disabled due to load higher than $threshold"
fi

rotate-config.sh

#!/bin/bash

STACK=dev
SERVICE=kong-gw
CONFIG=kong.yml
CONFIG_UUID=$(uuidgen)
CONFIG_PATH=./kong.yml
NEW_CONFIG=$STACK_$CONFIG_$CONFIG_UUID $CONFIG_PATH

docker config create $NEW_CONFIG

docker service update --config-rm kong.yml --config-add source=$NEW_CONFIG,target=/kong.yml,mode=0440 $STACK_$SERVICE

stack.yml

version: "3.3"
services:
  kong-gw:
    image: kong:latest
    environment:
      # - KONG_DECLARATIVE_CONFIG=/opt/kong.yml
      # - KONG_DATABASE=off
      - KONG_DATABASE=postgres
      - KONG_PG_HOST=kong-db
      - KONG_PROXY_ACCESS_LOG=/dev/stdout
      - KONG_ADMIN_ACCESS_LOG=/dev/stdout
      - KONG_PROXY_ERROR_LOG=/dev/stderr
      - KONG_ADMIN_ERROR_LOG=/dev/stderr
      - KONG_ADMIN_LISTEN=0.0.0.0:8001, 0.0.0.0:8444 ssl
        #configs:
        #- kong.yml
    ports:
      - 8000:8000
      - 8443:8443
      - 8001:8001
      - 8444:8444
    volumes:
      #- kong_config/kong.yml:/usr/local/kong/declarative/kong.yml
      - kong_config:/opt
    depends_on:
      - kong-db
      - kong-migration
  kong-migration:
    image: kong:latest
    command: kong migrations bootstrap
    environment:
      - KONG_DATABASE=postgres
      - KONG_PG_HOST=kong-db
    depends_on:
      - kong-db
  kong-db:
    image: postgres:9.6
    environment:
      - POSTGRES_USER=kong
      - POSTGRES_DB=kong
    volumes:
      - kong_db_vol:/var/lib/postgresql/data
    deploy:
      placement:
        constraints: [node.role == manager]
  visualizer:
    image: dockersamples/visualizer:stable
    ports:
      - "8080:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      placement:
        constraints: [node.role == manager]

configs:
  kong.yml:
    file: ./kong.yml
volumes:
  kong_config:
    driver: nfs
    driver_opts:
      share: 10.130.225.61:/kong
  kong_db_vol:
    driver: nfs
    driver_opts:
      share: 10.130.225.61/kong_db