This section provides several encryption configuration examples for CentOS 8.2 and PostgreSQL 13.
Connection between Zabbix frontend and PostgreSQL cannot be encrypted (parameters in GUI are disabled), if the value of Database host field begins with a slash or the field is empty.
Install the PostgreSQL database using the official repository.
PostgreSQL is not configured to accept TLS connections out-of-the-box. Please follow instructions from PostgreSQL documentation for certificate preparation with postgresql.conf and also for user access control through ph_hba.conf.
By default, the PostgreSQL socket is binded to the localhost, for the network remote connections allow to listen on the real network interface.
PostgreSQL settings for all modes can look like this:
/var/lib/pgsql/13/data/postgresql.conf:
...
ssl = on
ssl_ca_file = 'root.crt'
ssl_cert_file = 'server.crt'
ssl_key_file = 'server.key'
ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL'
ssl_prefer_server_ciphers = on
ssl_min_protocol_version = 'TLSv1.3'
...
For access control adjust /var/lib/pgsql/13/data/pg_hba.conf:
...
### require
hostssl all all 0.0.0.0/0 md5
### verify CA
hostssl all all 0.0.0.0/0 md5 clientcert=verify-ca
### verify full
hostssl all all 0.0.0.0/0 md5 clientcert=verify-full
...
To enable transport-only encryption for connections between Zabbix frontend and the database:
To enable transport-only encryption for connections between server and the database, configure /etc/zabbix/zabbix_server.conf:
...
DBHost=10.211.55.9
DBName=zabbix
DBUser=zbx_srv
DBPassword=<strong_password>
DBTLSConnect=required
...
Para habilitar a criptografia com verificação de autoridade certificadora para conexões entre o frontend do Zabbix e o banco de dados:
Alternativamente, isso pode ser configurado em /etc/zabbix/web/zabbix.conf.php:
...
$DB['ENCRYPTION'] = true;
$DB['KEY_FILE'] = '';
$DB['CERT_FILE'] = '';
$DB['CA_FILE'] = '/etc/ssl/pgsql/root.crt';
$DB['VERIFY_HOST'] = false;
$DB['CIPHER_LIST'] = '';
...
Para habilitar a criptografia com verificação de certificado para conexões entre o servidor Zabbix e o banco de dados, configure o arquivo /etc/zabbix/zabbix_server.conf:
...
DBHost=10.211.55.9
DBName=zabbix
DBUser=zbx_srv
DBPassword=<strong_password>
DBTLSConnect=verify_ca
DBTLSCAFile=/etc/ssl/pgsql/root.crt
...
Para habilitar a criptografia com verificação de certificado e identidade do host do banco de dados para conexões entre o frontend do Zabbix e o banco de dados:
Alternativamente, isso pode ser configurado em /etc/zabbix/web/zabbix.conf.php:
$DB['ENCRYPTION'] = true;
$DB['KEY_FILE'] = '';
$DB['CERT_FILE'] = '';
$DB['CA_FILE'] = '/etc/ssl/pgsql/root.crt';
$DB['VERIFY_HOST'] = true;
$DB['CIPHER_LIST'] = '';
...
To enable encryption with certificate and database host identity verification for connections between Zabbix server and the database, configure /etc/zabbix/zabbix_server.conf: