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Provisioning Infrastructure

Directory Structure

.
|-- README.md
|-- deploy-swarm.yaml
|-- files
|   |-- docker-daemon.json
|   `-- packages-docker-install.sh
|-- example-inventory.yaml
|-- leave-swarm.yaml
`-- tasks
    `-- docker-labels-per-node.yaml

Pre-Requisites

  1. Provisioning of VMs

  2. Preparation of inventory.yaml file from example-inventory.yaml.

  3. Firewall rules to setup docker swarm

  • Ssh port 22 needs to open in all VMs.
  • Outbound traffic to download packages etc.
  • Every physical node needs to expose the following ports for Docker swarm:
    • TCP port 2377 for cluster management communications
    • TCP and UDP port 7946 for communication among nodes
    • UDP port 4789 for overlay network traffic

Provisioning Docker Swarm, overlay network with required node labels

# install swarm, overlay network, node labels
ansible-playbook -v  deploy-swarm.yaml -i inventory.yaml 

# install swarm, overlay, node labels in localhost machine
ansible-playbook -v  deploy-swarm.yaml -i inventory.yaml --ask-become-pass --connection=local


# remove overlay and swarm
ansible-playbook -v leave-swarm.yaml -i inventory.yaml

# remove overlay and swarm in localhost machine
ansible-playbook -v  leave-swarm.yaml -i inventory.yaml --ask-become-pass --connection=local

Description

The playbook deploy-swarm.yaml does following things:

  • Installation of docker, other packages: vim, dnsutils, net-tools iputils-ping
  • Docker swarm creation
  • Overlay-net creation
  • Assign hostnames (for labels in grafana)
  • Assign docker node labels for placement of databroker, database, nginx, mon-stack components appropriately to the desginated nodes.

Provisioning Node-exporter and docker daemon metrics

# installs & starts node-exporter. Also updates targets for node-exporter and docker daemon metrics in the prometheus-node.
ansible-playbook -v deploy-node-exporter-docker-metrics.yaml -i inventory.yaml

# installs & starts node-exporter in localhost machine
ansible-playbook -v deploy-node-exporter-docker-metrics.yaml  -i inventory.yaml --ask-become-pass --connection=local

Some miscellaneous commands to manage node exporter

# Start node exporter
ansible nodes-with-exporter -i inventory.yaml --become -m script -a  "files/node-exporter-manager.sh -a start" 

# Stop node exporter
ansible nodes-with-exporter -i inventory.yaml --become -m script -a  "files/node-exporter-manager.sh -a stop"

# Check status
ansible nodes-with-exporter -i inventory.yaml --become -m script -a  "files/node-exporter-manager.sh -a status"

# uninstall node-exporter 
ansible  nodes-with-exporter -i inventory.yaml --become  -m script -a  "files/node-exporter-manager.sh -a uninstall"