Querying the blockchain

To start an instance of cardano-db-sync we are going to use Docker as manager and deployment of this instance. Before continuing make sure you have Docker installed. 
First we uninstall possible old versions of Docker:
sudo apt-get remove docker docker-engine docker.io containerd runc
Update the package repository:
sudo apt-get update
Install the necessary packages for the repositories over https:
sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common
Add the official Docker GPG key:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
Verify the key:
sudo apt-key fingerprint 0EBFCD88
Set up the stable Docker repository.
sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
Finally we update the repo (to get the most recent version) and install it.
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose
Install cardano-db-sync
Download the source code of cardano-db-sync project:
git clone https://github.com/input-output-hk/cardano-db-sync.git
cd cardano-db-sync
Lets check the configuration with which the new environment will be launch:
docker-compose config
My personal configuration is as follows:
version: "3.5"
​
services:
  postgres:
    image: postgres:11.5-alpine
    shm_size: 1g
    environment:
      - POSTGRES_LOGGING=true
      - POSTGRES_DB_FILE=/run/secrets/postgres_db
      - POSTGRES_PASSWORD_FILE=/run/secrets/postgres_password
      - POSTGRES_USER_FILE=/run/secrets/postgres_user
    secrets:
      - postgres_password
      - postgres_user
      - postgres_db
    volumes:
      - postgres:/var/lib/postgresql/data
    ports:
      - 5432:5432
    restart: on-failure
    logging:
      driver: "json-file"
      options:
        max-size: "200k"
        max-file: "10"
​
  cardano-node:
    image: inputoutput/cardano-node:1.19.0
    environment:
      - NETWORK=${NETWORK:-mainnet}
    volumes:
      - node-db:/data/db
      - node-ipc:/ipc
    restart: on-failure
    logging:
      driver: "json-file"
      options:
        max-size: "200k"
        max-file: "10"
​
  cardano-db-sync:
    image: inputoutput/cardano-db-sync:4.0.0
    environment:
      - NETWORK=${NETWORK:-mainnet}
      - POSTGRES_HOST=postgres
      - POSTGRES_PORT=5432
    depends_on:
      - cardano-node
      - postgres
    secrets:
      - postgres_password
      - postgres_user
      - postgres_db
    volumes:
      - node-ipc:/node-ipc
    restart: on-failure
    logging:
      driver: "json-file"
      options:
        max-size: "200k"
        max-file: "10"
​
secrets:
  postgres_db:
    file: ./config/secrets/postgres_db
  postgres_password:
    file: ./config/secrets/postgres_password
  postgres_user:
    file: ./config/secrets/postgres_user
​
volumes:
  postgres:
  node-db:
  node-ipc:
If we look at the configuration we see that Docker is going to use the postgres_db, postgres_password and postgres_user credentials. It will look for them in the /home/cardano/cardano-db-sync/config/secrets folder. The default repository brings these files under the suffix * _example, we just have to replace or duplicate the examples.
cp ~/home/cardano/cardano-db-sync/config/secrets/postgres_db_example \
    ~/home/cardano/cardano-db-sync/config/secrets/postgres_db
cp ~/home/cardano/cardano-db-sync/config/secrets/postgres_password_example \
    ~/home/cardano/cardano-db-sync/config/secrets/postgres_password
Remember change the password.
cp ~/home/cardano/cardano-db-sync/config/secrets/postgres_user_example \
    ~/home/cardano/cardano-db-sync/config/secrets/postgres_user
Before running Docker we need to add our user to the docker group:
sudo usermod -aG docker $USER
Start the instance with the log messages activated:
docker-compose up -d && docker-compose logs -f
With this we have started a cardano-node services, the postgresql database, and the cardano-db-sync tool. We can access these services through the default port: 5432.
A more optimal execution
We are going to use tmux to run docker in the background and show the machine status live.
start.sh
init-cardano-db.sh
stop.sh
start.sh
Create the script that starts the service in the background:
cd /home/cardano/cardano-db-sync
vim start.sh
#!/bin/bash
session="cardano-db-sync"
# Check if the session exists, discarding output
# We can check $? for the exit status (zero for success, non-zero for failure)
tmux has-session -t $session 2>/dev/null
if [ $? != 0 ]; then
 tmux attach-session -t $session
 tmux new -s "cardano-db-sync" -n "node" -d
 tmux split-window -v
 tmux select-pane -t 'cardano-db-sync:node.0'
 tmux split-window -h
 tmux send-keys -t 'cardano-db-sync:node.0' './init-cardano-db.sh' Enter
 tmux send-keys -t 'cardano-db-sync:node.1' 'htop' Enter
 tmux send-keys -t 'cardano-db-sync.2' 'nload' Enter
fi
​
tmux attach-session -t $session
init-cardano-db.sh
Create the script that executes docker:
cd /home/cardano/cardano-db-sync
vim init-cardano-db.sh
#!/bin/bash
docker-compose up -d && docker-compose logs -f
stop.sh
Create the script that ends the service associated with the "cardano-db-sync" session.
cardano-db-sync
vim stop.sh
#!/bin/bash
# Check if the session exists, discarding output
# We can check $? for the exit status (zero for success, non-zero for failure)
session="cardano-db-sync"
# Check if the session exists, discarding output
# We can check $? for the exit status (zero for success, non-zero for failure)
​
tmux has-session -t $session 2>/dev/null
if [ $? != 0 ]; then
        echo "Session not found."
else
        echo "Killing session"
        tmux kill-session -t cardano-db-sync
fi
Add execution permissions to the scripts:
chmod +x start.sh stop.sh init-cardano-db.sh
Finally, start the service:
./start.sh
Once started we can launch queries to the address localhost: 5432.
List all the containers:
docker container ls -a
Delete a specific container by its ID:
docker container rm 661525b875a1
Terminate all instances:
docker-compose down -v
Relaunch the instances:
docker-compose up --remove-orphans --force-recreate
​
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