Playbook: INFRA

Install pigsty & Add new optional to meta node with INFRA series playbooks.

infra

The infra.yml playbook will install Pigsty on the meta nodes.

When using Pigsty as a battery-included Postgres, infra.yml is sufficient for the installation.

What

The following tasks will be executed:

• Configure dir and environment variables of meta nodes.
• Download and create a LocalYum repo. (If offline packages /tmp/pkg.tgz exists, skip the download phase)
• Init the current meta node as a common node in Pigsty management.
• Deploy infra, including Prometheus, Grafana, Loki, Alertmanager, Consul Server, etc…
• Init a common PostgreSQL singleton on the current node as CMDB.

Where

This playbook works on meta nodes.

• Pigsty will use the node currently executing this playbook as Pigsty’s meta node by default.
• Pigsty will mark the current node as the meta node by default during configure and replace the placeholder IP 10.10.10.10 in the config template with the current node’s primary IP.
• Meta node can initiate management and deploy infra. It is not different from a regularly managed pgsql node.
• Pigsty uses meta nodes by default to deploy DCS Servers for PostgreSQL HA. But you can use external DCS Servers, too.
• Using multiple meta nodes is possible. Refer to the pigsty-dcs3 template: 3 meta x 3 nodes, allowing one failure.

How

Some special notes:

• This playbook is idempotent. Play again will erase Consul Server and CMDB (when protection is disabled)
• The complete execution of this playbook takes about 5-8 minutes with offline pkgs, depending on your machine spec.
• Depending on your network conditions, downloading packages directly from the Internet may take 10-20 minutes.
• This playbook treats the meta node as a common node to manage and deploy the PGSQL database. If it can be executed successfully, you could be confident that nodes.yml and pgsql.yml will work on nodes with the same state.
• The default pg-meta on the meta node will be used as the Pigsty CMDB and supporting advanced features.

Tasks

The playbook.

./infra.yml --tags=environ                       # Reconfigure envs on the meta node
./infra.yml --tags=repo -e repo_rebuild=true     # Forced re-creation of local repo
./infra.yml --tags=repo_upstream                 # Add upstream yum repos
./infra.yml --tags=prometheus                    # Recreate Prometheus
./infra.yml --tags=nginx_config,nginx_restart    # Regenerate Nginx conf and restart
……

Nodes within the meta group will be marked with the meta_node flag in Pigsty inventory.

infra-demo

The infra-demo.yml is a special playbook for the demo env, which can be used to initialize a 4-node sandbox in one go by interweaving meta node & other nodes initialization. It’s useful when trying to deploy multiple meta nodes.

It’s equivalent to following commands in the standard 4-node demo.

./infra.yml              # Install Pigsty on meta node
./nodes.yml -l pg-test   # Init 3 nodes of cluster pg-test
./pgsql.yml -l pg-test   # Init pgsql database cluster pg-test

infra-remove

The infra-remove.yml playbook will uninstall pigsty from the meta node.

Following services will be stopped & removed from meta nodes.

• grafana-server
• prometheus
• alertmanager
• node_exporter
• consul
• loki
• promtail

infra-jupyter

Playbook infra-jupyter.yml will install JupyterLab on the meta node.

Check Tutorial: Jupyter Lab for more details.