Tutorial: Design an Azure Database for PostgreSQL - Single Server using Azure CLI

APPLIES TO: Azure Database for PostgreSQL - Single Server

In this tutorial, you use Azure CLI (command-line interface) and other utilities to learn how to:

If you don't have an Azure trail subscription, create a trial subscription before you begin.

Prerequisites

If you prefer to run CLI reference commands locally, install the Azure CLI. If you're running on Windows or macOS, consider running Azure CLI in a Docker container. For more information, see How to run the Azure CLI in a Docker container.

• If you're using a local installation, sign in to the Azure CLI by using the az login command. To finish the authentication process, follow the steps displayed in your terminal. For other sign-in options, see Sign in with the Azure CLI.

• When you're prompted, install the Azure CLI extension on first use. For more information about extensions, see Use extensions with the Azure CLI.

• Run az version to find the version and dependent libraries that are installed. To upgrade to the latest version, run az upgrade.

Sign in to Azure

Use the following script to sign in using a different subscription, replacing <Subscription ID> with your Azure Subscription ID. If you don't have an Azure trail subscription, create a trial subscription before you begin.

az cloud set -n AzureChinaCloud
az login

subscription="<subscriptionId>" # add subscription here

az account set -s $subscription # ...or use 'az login'

For more information, see set active subscription or log in.

Set parameter values

The following values are used in subsequent commands to create the database and required resources. Server names need to be globally unique across all of Azure so the $RANDOM function is used to create the server name.

Change the location as appropriate for your environment. Replace 0.0.0.0 with the IP address range to match your specific environment. Use the public IP address of the computer you're using to restrict access to the server to only your IP address.

# Variable block
let "randomIdentifier=$RANDOM*$RANDOM"
location="China East 2"
resourceGroup="msdocs-postgresql-rg-$randomIdentifier"
tags="create-postgresql-server-and-firewall-rule"
server="msdocs-postgresql-server-$randomIdentifier"
sku="GP_Gen5_2"
login="azureuser"
password="Pa$$w0rD-$randomIdentifier"
# Specify appropriate IP address values for your environment
# to limit / allow access to the PostgreSQL server
startIp=0.0.0.0
endIp=0.0.0.0
echo "Using resource group $resourceGroup with login: $login, password: $password..."

Create a resource group

Create a resource group with the az group create command. An Azure resource group is a logical container into which Azure resources are deployed and managed. The following example creates a resource group named myResourceGroup in the chinaeast2 location:

# Create a resource group
echo "Creating $resourceGroup in $location..."
az group create --name $resourceGroup --location "$location" --tag $tag

Create a server

Create a server with the az postgres server create command.

# Create a PostgreSQL server in the resource group
# Name of a server maps to DNS name and is thus required to be globally unique in Azure.
echo "Creating $server in $location..."
az postgres server create --name $server --resource-group $resourceGroup --location "$location" --admin-user $login --admin-password $password --sku-name $sku

Configure a server-based firewall rule

Create a firewall rule with the az postgres server firewall-rule create command to give your local environment access to connect to the server.

# Configure a firewall rule for the server 
echo "Configuring a firewall rule for $server for the IP address range of $startIp to $endIp"
az postgres server firewall-rule create --resource-group $resourceGroup --server $server --name AllowIps --start-ip-address $startIp --end-ip-address $endIp

List server-based firewall rules

To list the existing server firewall rules, run the az postgres server firewall-rule list command.

# List firewall rules for the server
echo "List of server-based firewall rules for $server"
az postgres server firewall-rule list --resource-group $resourceGroup --server-name $server
# You may use the switch `--output table` for a more readable table format as the output.

The output lists the firewall rules, if any, by default in JSON format. You may use the switch --output table for a more readable table format as the output.

Get the connection information

To connect to your server, provide host information and access credentials.

az postgres server show --resource-group $resourceGroup --name $server

Make a note of the administratorLogin and fullyQualifiedDomainName values.

Connect to the Azure Database for PostgreSQL server by using psql

The psql client is a popular choice for connecting to PostgreSQL servers. You can use psql on your local environment if you have it available. An empty database, postgres, is automatically created with a new PostgreSQL server. You can use that database to connect with psql, as shown in the following code.

psql --host=<server_name>.postgres.database.chinacloudapi.cn --port=5432 --username=<admin_user>@<server_name> --dbname=postgres

psql postgresql://<admin_user>%40<server_name>@<server_name>.postgres.database.chinacloudapi.cn:5432/postgres

Create a blank database

1. Once you are connected to the server, create a blank database at the prompt:

   CREATE DATABASE mypgsqldb;
   

2. At the prompt, execute the following command to switch connection to the newly created database mypgsqldb:

   \c mypgsqldb
   

Create tables in the database

Now that you know how to connect to the Azure Database for PostgreSQL, you can complete some basic tasks:

First, create a table and load it with some data. For example, create a table that tracks inventory information:

CREATE TABLE inventory (
  id serial PRIMARY KEY, 
  name VARCHAR(50), 
  quantity INTEGER
);

You can see the newly created table in the list of tables now by typing:

\dt

Load data into the table

Now that there is a table created, insert some data into it. At the open command prompt window, run the following query to insert some rows of data:

INSERT INTO inventory (id, name, quantity) VALUES (1, 'banana', 150); 
INSERT INTO inventory (id, name, quantity) VALUES (2, 'orange', 154);

You have now added two rows of sample data into the table you created earlier.

Query and update the data in the tables

Execute the following query to retrieve information from the inventory table:

SELECT * FROM inventory;

You can also update the data in the inventory table:

UPDATE inventory SET quantity = 200 WHERE name = 'banana';

You can see the updated values when you retrieve the data:

SELECT * FROM inventory;

Restore a database to a previous point in time

Imagine you have accidentally deleted a table. This is something you cannot easily recover from. Azure Database for PostgreSQL allows you to go back to any point-in-time for which your server has backups (determined by the backup retention period you configured) and restore this point-in-time to a new server. You can use this new server to recover your deleted data.

The following command restores the sample server to a point before the table was added:

az postgres server restore --resource-group myresourcegroup --name mydemoserver-restored --restore-point-in-time 2017-04-13T13:59:00Z --source-server mydemoserver

The az postgres server restore command needs the following parameters:

Restoring a server to a point-in-time creates a new server, copied as the original server as of the point in time you specify. The location and pricing tier values for the restored server are the same as the source server.

The command is synchronous, and will return after the server is restored. Once the restore finishes, locate the new server that was created. Verify the data was restored as expected.

Clean up resources

Use the following command to remove the resource group and all resources associated with it using the az group delete command - unless you have an ongoing need for these resources. Some of these resources may take a while to create, as well as to delete.

az group delete --name $resourceGroup

Next steps

In this tutorial, you learned how to use Azure CLI (command-line interface) and other utilities to: