To ensure the correct operation of the system, PostgreSQL version 10–15 is required. The article describes the installation of PostgreSQL 13 for Ubuntu Linux 20.04 and 22.04. You can also refer to the official PostgreSQL documentation.
The installation consists of 10 steps:
- Prepare nodes (servers).
- Prepare the etcd cluster.
- Install PostgreSQL.
- Configure PostgreSQL.
- Install Patroni.
- Configure Patroni.
- Prepare the PostgreSQL+Patroni cluster.
- Prepare PGBouncer (optional).
- Configure HAProxy (postgres block).
- Connect to PostgreSQL.
Step 1: Prepare nodes (servers)
Create three nodes (servers) with sequentially numbered host names.
начало внимание
The minimum number of servers for organizing a cluster is three.
конец внимание
In this example, three nodes with the following hostnames and IP addresses are used:
- postgres-server1.your_domain, 192.168.1.1;
- postgres-server2.your_domain, 192.168.1.2;
- postgres-server3.your_domain, 192.168.1.3.
Create the necessary host name mappings in DNS. If not possible, add the required entries in /etc/hosts.
Step 2: Prepare the etcd cluster
- Install
etcd on all nodes:
sudo apt-get install etcd -y
- Stop
etcd on all nodes:
sudo systemctl stop etcd
- Remove the data directory:
sudo rm -rf /var/lib/etcd/*
- Move the default configuration file:
sudo mv /etc/default/etcd{,.original}
- Create and open a new configuration file for editing:
sudo nano /etc/default/etcd
- Add the example configurations for the postgres-server1.your_domain node:
ETCD_NAME="postgres-server1"
ETCD_DATA_DIR="/var/lib/etcd/default"
ETCD_HEARTBEAT_INTERVAL="1000"
ETCD_ELECTION_TIMEOUT="5000"
ETCD_LISTEN_PEER_URLS="http://192.168.1.1:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.1.1:2379,http://localhost:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.1.1:2380"
ETCD_INITIAL_CLUSTER="postgres-server1=http://192.168.1.1:2380,postgres-server2=http://192.168.1.2:2380,postgres-server3=http://192.168.1.3:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-postgres-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.1.1:2379"
ETCD_ENABLE_V2="true"
ETCD_INITIAL_ELECTION_TICK_ADVANCE="false"
Example configurations with enabling TLS/SSL for the postgres-server1.your_domain node:
ETCD_NAME="postgres-server1"
ETCD_DATA_DIR="/var/lib/etcd/default"
ETCD_HEARTBEAT_INTERVAL="1000"
ETCD_ELECTION_TIMEOUT="5000"
ETCD_LISTEN_PEER_URLS="https://192.168.1.1:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.1:2379,https://localhost:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://postgres-server1.your_domain:2380"
ETCD_INITIAL_CLUSTER="postgres-server1=https://postgres-server1.your_domain:2380,postgres-server2=https://postgres-server2.your_domain:2380,postgres-server3=https://postgres-server3.your_domain:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-postgres-cluster"
ETCD_ADVERTISE_CLIENT_URLS="https://postgres-server1.your_domain:2379"
ETCD_ENABLE_V2="true"
ETCD_CERT_FILE="/path/to/public.crt"
ETCD_KEY_FILE="/path/to/private.key"
ETCD_CLIENT_CERT_AUTH="true"
ETCD_TRUSTED_CA_FILE="/path/to/certCA.pem"
ETCD_PEER_CERT_FILE="/path/to/public.crt"
ETCD_PEER_KEY_FILE="/path/to/private.key"
ETCD_PEER_CLIENT_CERT_AUTH="true"
ETCD_PEER_TRUSTED_CA_FILE="/path/to/certCA.pem"
ETCD_INITIAL_ELECTION_TICK_ADVANCE="false"
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- Add the example configurations to the file for the postgres-server2.your_domain node:
ETCD_NAME="postgres-server2"
ETCD_DATA_DIR="/var/lib/etcd/default"
ETCD_HEARTBEAT_INTERVAL="1000"
ETCD_ELECTION_TIMEOUT="5000"
ETCD_LISTEN_PEER_URLS="http://192.168.1.2:12380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.1.2:2379,http://127.0.0.1:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.1.2:12380"
ETCD_INITIAL_CLUSTER="postgres-server1=http://192.168.1.1:12380,postgres-server2=http://192.168.1.2:12380,postgres-server3=http://192.168.1.3:12380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-postgres-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.1.2:2379"
ETCD_ENABLE_V2="true"
ETCD_INITIAL_ELECTION_TICK_ADVANCE="false"
Example configurations with enabling TLS/SSL for the postgres-server2.your_domain:
ETCD_NAME="postgres-server2"
ETCD_DATA_DIR="/var/lib/etcd/default"
ETCD_HEARTBEAT_INTERVAL="1000"
ETCD_ELECTION_TIMEOUT="5000"
ETCD_LISTEN_PEER_URLS="https://192.168.1.2:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.2:2379,https://localhost:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://postgres-server2.your_domain:2380"
ETCD_INITIAL_CLUSTER="postgres-server1=https://postgres-server1.your_domain:2380,postgres-server2=https://postgres-server2.your_domain:2380,postgres-server3=https://postgres-server3.your_domain:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-postgres-cluster"
ETCD_ADVERTISE_CLIENT_URLS="https://postgres-server2.your_domain:2379"
ETCD_ENABLE_V2="true"
ETCD_CERT_FILE="/path/to/public.crt"
ETCD_KEY_FILE="/path/to/private.key"
ETCD_CLIENT_CERT_AUTH="true"
ETCD_TRUSTED_CA_FILE="/path/to/certCA.pem"
ETCD_PEER_CERT_FILE="/path/to/public.crt"
ETCD_PEER_KEY_FILE="/path/to/private.key"
ETCD_PEER_CLIENT_CERT_AUTH="true"
ETCD_PEER_TRUSTED_CA_FILE="/path/to/certCA.pem"
ETCD_INITIAL_ELECTION_TICK_ADVANCE="false"
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- Add the example configurations to the file for the postgres-server3.your_domain node:
ETCD_NAME="postgres-server3"
ETCD_DATA_DIR="/var/lib/etcd/default"
ETCD_HEARTBEAT_INTERVAL="1000"
ETCD_ELECTION_TIMEOUT="5000"
ETCD_LISTEN_PEER_URLS="http://192.168.1.3:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.1.3:2379,http://localhost:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.1.3:2380"
ETCD_INITIAL_CLUSTER="postgres-server1=http://192.168.1.1:2380,postgres-server2=http://192.168.1.2:2380,postgres-server3=http://192.168.1.3:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-postgres-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.1.3:2379"
ETCD_ENABLE_V2="true"
ETCD_INITIAL_ELECTION_TICK_ADVANCE="false"
Example configurations with enabling TLS/SSL for the postgres-server3.your_domain:
ETCD_NAME="postgres-server3"
ETCD_DATA_DIR="/var/lib/etcd/default"
ETCD_HEARTBEAT_INTERVAL="1000"
ETCD_ELECTION_TIMEOUT="5000"
ETCD_LISTEN_PEER_URLS="https://192.168.1.3:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.3:2379,https://localhost:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://postgres-server3.your_domain:2380"
ETCD_INITIAL_CLUSTER="postgres-server1=https://postgres-server1.your_domain:2380,postgres-server2=https://postgres-server2.your_domain:2380,postgres-server3=https://postgres-server3.your_domain:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-postgres-cluster"
ETCD_ADVERTISE_CLIENT_URLS="https://postgres-server3.your_domain:2379"
ETCD_ENABLE_V2="true"
ETCD_CERT_FILE="/path/to/public.crt"
ETCD_KEY_FILE="/path/to/private.key"
ETCD_CLIENT_CERT_AUTH="true"
ETCD_TRUSTED_CA_FILE="/path/to/certCA.pem"
ETCD_PEER_CERT_FILE="/path/to/public.crt"
ETCD_PEER_KEY_FILE="/path/to/private.key"
ETCD_PEER_CLIENT_CERT_AUTH="true"
ETCD_PEER_TRUSTED_CA_FILE="/path/to/certCA.pem"
ETCD_INITIAL_ELECTION_TICK_ADVANCE="false"
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Let's review the provided parameters:
ETCD_NAME: Unique name within the cluster;ETCD_LISTEN_CLIENT_URLS: Connection point for clients in the cluster;ETCD_ADVERTISE_CLIENT_URLS: URLs through which other cluster nodes can be found.;ETCD_LISTEN_PEER_URLS: Connection point for other nodes in the cluster;ETCD_INITIAL_ADVERTISE_PEER_URLS: Initial URLs through which other nodes can find it;ETCD_INITIAL_CLUSTER_TOKEN: Token for the cluster, must be the same on all nodes.;ETCD_INITIAL_CLUSTER: List of nodes in the cluster at startup;ETCD_INITIAL_CLUSTER_STATE: Can take two values: new and existing;ETCD_DATA_DIR: Location of the cluster's data directory;ETCD_ELECTION_TIMEOUT: Time in milliseconds between the last received notification from the cluster leader and attempting to take over the leader role on the follower node;ETCD_HEARTBEAT_INTERVAL: Time in milliseconds between leader notifications sent by the leader node to inform others that it is still the leader;ETCD_CERT_FILE: Path to the server certificate file;ETCD_KEY_FILE: Path to the private key file;ETCD_TRUSTED_CA_FILE: Path to the root CA file;ETCD_CLIENT_CERT_AUTH: Can take two values: true and false;ETCD_PEER_CERT_FILE: Path to the server certificate file;ETCD_PEER_KEY_FILE: Path to the private key file;ETCD_PEER_TRUSTED_CA_FILE: Path to the root CA file;ETCD_PEER_CLIENT_CERT_AUTH: Can take two values: true and false;
- Restart
etcd on all nodes:
sudo systemctl restart etcd
- Check the cluster status.
For a cluster without TLS:
sudo etcdctl cluster-health
For a cluster with TLS:
sudo etcdctl -C https://postgres-server1.your_domain:2379 --key-file /path/to/private.key --cert-file /path/to/public.crt --ca-file /path/to/certCA.pem cluster-health
Step 3: Install PostgreSQL
начало внимание
Hardware requirements for ELMA365 on PostgreSQL can be found in System requirements for ELMA365 On-Premises Enterprise.
конец внимание
- To install PostgreSQL, add the official repository
postgresql:
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
- Update package cache:
sudo apt update
- Install PostgreSQL on all nodes:
sudo apt install postgresql-13 -y
Step 4: Configure PostgreSQL
начало внимание
For the password, the following characters are allowed:
- Uppercase Latin letters: A to Z
- Lowercase Latin letters: a to z
- Digits: 0 to 9
- Symbols: -_
Reserved (invalid) symbols:
! * ' ( ) ; : @ & = + $ , / ? % # [ ]
конец внимание
Actions for the node postgres-server1.your_domain:
- Create a new role
elma365 with the password SecretPassword:
sudo -u postgres psql -c \
"CREATE ROLE elma365 WITH login password 'SecretPassword';"
- Create a database
elma365 with owner elma365:
sudo -u postgres psql -c \
"CREATE DATABASE elma365 WITH OWNER elma365;"
- Add necessary extensions for the database
elma365:
sudo -u postgres psql -d elma365 -c \
"CREATE EXTENSION \"uuid-ossp\"; CREATE EXTENSION pg_trgm;"
- Create a new role
replicator with the password ReplicatorPassword for working with replicas. It must match the Patroni settings in the block postgresql - authentication - replication and the list of allowed PostgreSQL hosts in the file pg_hba.conf:
sudo -u postgres psql -c \
"CREATE USER replicator WITH REPLICATION ENCRYPTED PASSWORD 'ReplicatorPassword';"
- Set a password for the postgres user:
sudo -u postgres psql -c "ALTER USER postgres PASSWORD 'PostgresPassword';"
- Stop PostgreSQL:
systemctl stop postgresql
Actions for the nodes postgres-server2.your_domain and postgres-server3.your_domain:
- Stop PostgreSQL:
systemctl stop postgresql
- Remove the data directory on the nodes postgres-server2.your_domain and postgres-server3.your_domain:
rm -rf /var/lib/postgresql/13/main
Step 5: Install Patroni
- Install Patroni and PIP on all nodes:
sudo apt-get install python3-pip python3-dev libpq-dev -y
sudo apt-get install patroni -y
- Install dependencies for Patroni to work on all nodes:
pip3 install psycopg2-binary
pip3 install wheel
pip3 install python-etcd
Step 6: Configure Patroni
- Create a configuration file:
sudo nano /etc/patroni/config.yml
- Place an example initial configuration in the created
/etc/patroni/config.yml file, changing the IP addresses for each node in the cluster. Pay attention to the comments in this file.
Example initial configuration
scope: postgres-cluster # the same value on all nodes
name: postgresql-server1 # different values on all nodes
namespace: /service/ # the same value on all nodes
restapi:
listen: postgres-server1.your_domain:8008 # address of the node where the file is
connect_address: postgres-server1.your_domain:8008 # address of the node where the file is
etcd:
hosts: postgres-server1.your_domain:2379,postgres-server2.your_domain:2379,postgres-server3.your_domain:2379 # list of all the nodes with installed etcd
bootstrap:
method: initdb
dcs:
ttl: 30
loop_wait: 10
retry_timeout: 10
maximum_lag_on_failover: 1048576
master_start_timeout: 300
synchronous_mode: false
synchronous_mode_strict: false
synchronous_node_count: 1
postgresql:
use_pg_rewind: true
use_slots: true
parameters:
max_connections: 2000
superuser_reserved_connections: 5
max_locks_per_transaction: 64
max_prepared_transactions: 0
huge_pages: try
shared_buffers: 512MB
work_mem: 128MB
maintenance_work_mem: 256MB
effective_cache_size: 4GB
checkpoint_timeout: 15min
checkpoint_completion_target: 0.9
wal_compression: on
min_wal_size: 2GB
max_wal_size: 4GB
wal_buffers: 32MB
default_statistics_target: 1000
seq_page_cost: 1
random_page_cost: 4
effective_io_concurrency: 2
synchronous_commit: on
autovacuum: on
autovacuum_max_workers: 5
autovacuum_vacuum_scale_factor: 0.01
autovacuum_analyze_scale_factor: 0.02
autovacuum_vacuum_cost_limit: 200
autovacuum_vacuum_cost_delay: 20
autovacuum_naptime: 1s
max_files_per_process: 4096
archive_mode: on
archive_timeout: 1800s
archive_command: cd .
wal_level: replica
wal_keep_segments: 130
max_wal_senders: 10
max_replication_slots: 10
hot_standby: on
hot_standby_feedback: True
wal_log_hints: on
shared_preload_libraries: pg_stat_statements,auto_explain
pg_stat_statements.max: 10000
pg_stat_statements.track: all
pg_stat_statements.save: off
auto_explain.log_min_duration: 10s
auto_explain.log_analyze: true
auto_explain.log_buffers: true
auto_explain.log_timing: false
auto_explain.log_triggers: true
auto_explain.log_verbose: true
auto_explain.log_nested_statements: true
track_io_timing: on
log_lock_waits: on
log_temp_files: 3
track_activities: on
track_counts: on
track_functions: all
log_checkpoints: on
logging_collector: on
log_truncate_on_rotation: on
log_rotation_age: 1d
log_rotation_size: 0
log_line_prefix: '%t [%p-%l] %r %q%u@%d '
log_filename: 'postgresql-%a.log'
log_directory: /var/log/postgresql
initdb: # List options to be passed on to initdb
- encoding: UTF8
- locale: en_US.UTF-8
- data-checksums
pg_hba: # must contain addresses of ALL the machines used in the cluster
- local all postgres peer
- local all all peer
- host all all 0.0.0.0/0 md5
- host replication replicator localhost trust
- host replication replicator 192.168.1.1/32 md5
- host replication replicator 192.168.1.2/32 md5
- host replication replicator 192.168.1.3/32 md5
postgresql:
listen: 192.168.1.1,127.0.0.1:5432 # address of the node where the file is
connect_address: 192.168.1.1:5432 # address of the node where the file is
use_unix_socket: true
data_dir: /var/lib/postgresql/13/main # data directory
bin_dir: /usr/lib/postgresql/13/bin
config_dir: /etc/postgresql/13/main
pgpass: /var/lib/postgresql/.pgpass_patroni
authentication:
replication:
username: replicator
password: ReplicatorPassword
superuser:
username: postgres
password: PostgresPassword
parameters:
unix_socket_directories: /var/run/postgresql
pg_hba: # must contain addresses of ALL the machines used in the cluster
- local all postgres peer
- local all all peer
- host all all 0.0.0.0/0 md5
- host replication replicator localhost trust
- host replication replicator 192.168.1.1/32 md5
- host replication replicator 192.168.1.2/32 md5
- host replication replicator 192.168.1.3/32 md5
remove_data_directory_on_rewind_failure: false
remove_data_directory_on_diverged_timelines: false
create_replica_methods:
- basebackup
basebackup:
max-rate: '100M'
checkpoint: 'fast'
watchdog:
mode: off # Allowed values: off, automatic, required
device: /dev/watchdog
safety_margin: 5
tags:
nofailover: false
noloadbalance: false
clonefrom: false
nosync: false
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Example initial configuration to enable TLS/SSL support in Patroni
Place the example initial configuration with TLS/SSL in the file /etc/patroni/config.yml. Pay attention to the comments in this file:
scope: postgres-cluster # the same value on all nodes
name: postgresql-server1 # different values on all nodes
namespace: /service/ # the same value on all nodes
restapi:
listen: postgres-server1.your_domain:8008 # address of the node where the file is
connect_address: postgres-server1.your_domain:8008 # address of the node where the file is
cafile: /path/to/pgCA.pem
certfile: /path/to/pg.crt # path to the server certificate file
keyfile: /path/to/pg.key # path to the private key file
verify_client: required # path to the root CA file
etcd:
protocol: https
cert: /path/to/public.crt # path to the server certificate file
key: /path/to/private.key # path to the private key file
cacert: /path/to/certCA.pem # path to the root CA file
hosts: postgres-server1.your_domain:2379,postgres-server2.your_domain:2379,postgres-server3.your_domain:2379 # list of all the nodes with installed etcd
ctl:
insecure: false # Allow connections to SSL sites without certs
certfile: /path/to/pg.crt # path to the server certificate file
keyfile: /path/to/pg.key # path to the private key file
cacert: /path/to/pgCA.pem # path to the root CA file
bootstrap:
method: initdb
dcs:
ttl: 30
loop_wait: 10
retry_timeout: 10
maximum_lag_on_failover: 1048576
master_start_timeout: 300
synchronous_mode: false
synchronous_mode_strict: false
synchronous_node_count: 1
postgresql:
use_pg_rewind: true
use_slots: true
parameters:
max_connections: 2000
superuser_reserved_connections: 5
max_locks_per_transaction: 64
max_prepared_transactions: 0
huge_pages: try
shared_buffers: 512MB
work_mem: 128MB
maintenance_work_mem: 256MB
effective_cache_size: 4GB
checkpoint_timeout: 15min
checkpoint_completion_target: 0.9
wal_compression: on
min_wal_size: 2GB
max_wal_size: 4GB
wal_buffers: 32MB
default_statistics_target: 1000
seq_page_cost: 1
random_page_cost: 4
effective_io_concurrency: 2
synchronous_commit: on
autovacuum: on
autovacuum_max_workers: 5
autovacuum_vacuum_scale_factor: 0.01
autovacuum_analyze_scale_factor: 0.02
autovacuum_vacuum_cost_limit: 200
autovacuum_vacuum_cost_delay: 20
autovacuum_naptime: 1s
max_files_per_process: 4096
archive_mode: on
archive_timeout: 1800s
archive_command: cd .
wal_level: replica
wal_keep_segments: 130
max_wal_senders: 10
max_replication_slots: 10
hot_standby: on
hot_standby_feedback: True
wal_log_hints: on
shared_preload_libraries: pg_stat_statements,auto_explain
pg_stat_statements.max: 10000
pg_stat_statements.track: all
pg_stat_statements.save: off
auto_explain.log_min_duration: 10s
auto_explain.log_analyze: true
auto_explain.log_buffers: true
auto_explain.log_timing: false
auto_explain.log_triggers: true
auto_explain.log_verbose: true
auto_explain.log_nested_statements: true
track_io_timing: on
log_lock_waits: on
log_temp_files: 3
track_activities: on
track_counts: on
track_functions: all
log_checkpoints: on
logging_collector: on
log_truncate_on_rotation: on
log_rotation_age: 1d
log_rotation_size: 0
log_line_prefix: '%t [%p-%l] %r %q%u@%d '
log_filename: 'postgresql-%a.log'
log_directory: /var/log/postgresql
ssl: on
ssl_ca_file: '/path/to/pgCA.pem'
ssl_cert_file: '/path/to/pg.crt'
ssl_key_file: '/path/to/pg.key'
initdb: # List options to be passed on to initdb
- encoding: UTF8
- locale: en_US.UTF-8
- data-checksums
pg_hba: # must contain addresses of ALL the machines used in the cluster
- local all postgres peer
- local all all peer
- hostssl all all 0.0.0.0/0 md5
- hostssl replication replicator localhost trust
- hostssl replication replicator 192.168.1.1/32 md5
- hostssl replication replicator 192.168.1.2/32 md5
- hostssl replication replicator 192.168.1.3/32 md5
postgresql:
listen: 192.168.1.1,127.0.0.1:5432 # address of the node where the file is
connect_address: 192.168.1.1:5432 # address of the node where the file is
use_unix_socket: true
data_dir: /var/lib/postgresql/13/main # data directory
bin_dir: /usr/lib/postgresql/13/bin
config_dir: /etc/postgresql/13/main
pgpass: /var/lib/postgresql/.pgpass_patroni
authentication:
replication:
username: replicator
password: ReplicatorPassword
sslcert: /path/to/pg.crt # path to the server certificate file
sslkey: /path/to/pg.key # path to the private key file
sslrootcert: /path/to/pgCA.pem # path to the root CA file
superuser:
username: postgres
password: PostgresPassword
sslcert: /path/to/pg.crt # path to the server certificate file
sslkey: /path/to/pg.key # path to the private key file
sslrootcert: /path/to/pgCA.pem # path to the root CA file
parameters:
unix_socket_directories: /var/run/postgresql
pg_hba: # must contain addresses of ALL the machines used in the cluster
- local all postgres peer
- local all all peer
- hostssl all all 0.0.0.0/0 md5
- hostssl replication replicator localhost trust
- hostssl replication replicator 192.168.1.1/32 md5
- hostssl replication replicator 192.168.1.2/32 md5
- hostssl replication replicator 192.168.1.3/32 md5
remove_data_directory_on_rewind_failure: false
remove_data_directory_on_diverged_timelines: false
create_replica_methods:
- basebackup
basebackup:
max-rate: '100M'
checkpoint: 'fast'
watchdog:
mode: off # Allowed values: off, automatic, required
device: /dev/watchdog
safety_margin: 5
tags:
nofailover: false
noloadbalance: false
clonefrom: false
nosync: false
Make the postgres user the owner of the private key file pg.key:
Начало внимание
The private key file pg.key specified in the section postgresql must have permissions of u=rw (0600) or less if it belongs to the PostgreSQL database user, or permissions of u=rw, g=r (0640) or less if it belongs to the root .
Конец внимание
sudo chown postgres:postgres -R /path/to/pg.key
sudo chmod 600 /path/to/pg.key
For more details on TLS/SSL configuration in Patroni, refer to the official Patroni documentation.
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- Make the postgres user the owner of the configuration directory:
sudo chown postgres:postgres -R /etc/patroni
sudo chmod 700 /etc/patroni
Step 7: Prepare PostgreSQL+Patroni cluster
- Start the Patroni service on the postgres-server1.your_domain node, and then on the nodes postgres-server2.your_domain and postgres-server3.your_domain:
sudo systemctl enable --now patroni.service
- Check the cluster status:
patronictl -c /etc/patroni/config.yml list
Step 8: Prepare PGBouncer (optional)
PGBouncer is designed to manage a connection pool to PostgreSQL, minimizing the overhead associated with establishing new connections to PostgreSQL. For information on installing and configuring PGBouncer, refer to Install PGBouncer.
Step 9: Configure HAProxy (postgres block)
Configure a high availablility HAProxy to handle requests to PostgreSQL and load balance between the nodes of the PostgreSQL cluster. For more details, refer to Configure HAProxy for PostgreSQL.
Step 10: Connecto to PostgreSQL
Connection string to connect to the PostgreSQL cluster:
psqlUrl: postgresql://elma365:SecretPassword@haproxy-server.your_domain:5000/elma365?sslmode=disable
Connection string to connect to the PostgreSQL cluster for read-only access:
psqlUrl: postgresql://elma365:SecretPassword@haproxy-server.your_domain:5001/elma365?sslmode=disable
Connecting to the PostgreSQL cluster with TLS/SSL
Connection string to connect to the PostgreSQL cluster with TLS/SS:
psqlUrl: postgresql://elma365:SecretPassword@haproxy-server.your_domain:5000/elma365?sslmode=require
Connection string to connect to the PostgreSQL cluster with TLS/SSL for read-only access:
psqlUrl: postgresql://elma365:SecretPassword@haproxy-server.your_domain:5001/elma365?sslmode=require
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