sudo -i

# update package index
apt update

#install tools
apt install lsb-release curl gpg -y

# add postgresql 17 repository
sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'

# import repo signin key
curl -fsSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/postgresql.gpg

# update package index
apt update

# install postgresql 17
apt install postgresql-17 -y

# check status
systemctl status postgresql
# start postgresql service
systemctl start postgresql
# enable postgresql service
systemctl enable postgresql


# confirm checking status
systemctl status postgresql


# INITIALIZE POSTGRESQL

# switch to postgres user
su - postgres

# access postgres SQL shell
psql

# check version of postgres
SELECT VERSION();

# list databases
\l 
# or list databases with more infos 
\l+

# switch to specific database
\c db_name

# check tables
\dt




# INITIALIZE POSTGRESQL INTO THE INCUS CONTAINER TO ACCEPT LOCAL HOST REQUESTS #

# edit postgresql.conf file
vim /etc/postgresql/17/main/postgresql.conf

# uncomment and edit as follow
listen_addresses = '*'

# edit pg_hba.conf
vim /etc/postgresql/17/main/pg_hba.conf

# add following new line (see beginning of the file for explanations on options). note that 0.0.0.0/0 allow any adresse ip as requester
host    all             all             0.0.0.0/0          scram-sha-256

# restart postgresql
systemctl restart postgresql


# try to ping the container ip adrress from yout local host and then the opposite
ping 10.78.13.30

# if the ping is working, connect to postgresql using a client as psql
psql -h 10.184.116.91 -U testuser -d testdb
# check tables
\dt
# show content 
SELECT * FROM employees;




# simple test DB in SQL
CREATE DATABASE testdb;

CREATE TABLE employees (
    id SERIAL PRIMARY KEY,
    name VARCHAR(100),
    position VARCHAR(50),
    salary NUMERIC(10, 2)
);




# create postgresql user
CREATE USER okinrev WITH PASSWORD 'supermotdepassse';

# give permission on that database for the newly created user
GRANT ALL PRIVILEGES ON DATABASE testdb TO okinrev;

# grant access on specific public table
GRANT SELECT ON public.employees TO testuser;
host    replication     replicator      10.184.116.221/0        scram-sha-256
# remove permission from user
REVOKE ALL PRIVILEGES ON DATABASE testdb FROM okinrev;

# remove user
DROP USER okinrev;

sudo -i -u postgres
ssh-keygen -t rsa -b 2048 -f ~/.ssh/id_rsa -N ""
copie ssh key to pitr server

wal_level = replica

archive_mode = on

archive_command = 'rsync -a %p root@10.184.116.233:/srv/wal/%f'
restore_command = 'rsync -a root@10.184.116.233:/srv/wal/%f %p'

recovery_target_time = '2024-12-30 15:05:00' 




touch /var/lib/postgresql/17/main/recovery.signal



rsync -a  root@10.184.116.233:/srv/wal/%f



INSERT INTO employees (name, position, salary)
VALUES 
    ('Intru', 'Malicieux', 99999.00);
    
   14:10:50 execution
   
   
host    replication     replicator      10.184.116.221/0        scram-sha-256



 DO $$
DECLARE
    i INT;
BEGIN
    FOR i IN 1..2000000 LOOP
        INSERT INTO employees (name, position, salary)
        VALUES (
            'Ouioui ' || i,                -- Chaîne avec l'indice pour éviter les doublons
            'Mechant ' || i,            -- Position avec l'indice
            77777.00                      -- Salaire constant
        );
    END LOOP;
END $$;

execution 15:59:45