LightDB-A Database Ports and Protocols
Lists network ports and protocols used within the LightDB-A cluster.
LightDB-A Database clients connect with TCP to the LightDB-A coordinator instance at the client connection port, 5432 by default. The listen port can be reconfigured in the postgresql.conf configuration file. Client connections use the PostgreSQL libpq API. The psql command-line interface, several LightDB-A utilities, and language-specific programming APIs all either use the libpq library directly or implement the libpq protocol internally.
Each segment instance also has a client connection port, used solely by the coordinator instance to coordinate database operations with the segments. The gpstate -p command, run on the LightDB-A coordinator, lists the port assignments for the LightDB-A coordinator and the primary segments and mirrors. For example:
[gpadmin@cdw ~]$ gpstate -p
20190403:02:57:04:011030 gpstate:cdw:gpadmin-[INFO]:-Starting gpstate with args: -p
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:-local LightDB-A Version: 'postgres (LightDB-A Database) 5.17.0 build commit:fc9a9d4cad8dd4037b9bc07bf837c0b958726103'
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:-coordinator LightDB-A Version: 'PostgreSQL 8.3.23 (LightDB-A Database 5.17.0 build commit:fc9a9d4cad8dd4037b9bc07bf837c0b958726103) on x86_64-pc-linux-gnu, compiled by GCC gcc (GCC) 6.2.0, 64-bit compiled on Feb 13 2019 15:26:34'
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:-Obtaining Segment details from coordinator...
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:--Coordinator segment instance /data/coordinator/gpseg-1 port = 5432
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:--Segment instance port assignments
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:-----------------------------------
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- Host Datadir Port
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw1 /data/primary/gpseg0 20000
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw2 /data/mirror/gpseg0 21000
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw1 /data/primary/gpseg1 20001
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw2 /data/mirror/gpseg1 21001
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw1 /data/primary/gpseg2 20002
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw2 /data/mirror/gpseg2 21002
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw2 /data/primary/gpseg3 20000
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw3 /data/mirror/gpseg3 21000
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw2 /data/primary/gpseg4 20001
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw3 /data/mirror/gpseg4 21001
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw2 /data/primary/gpseg5 20002
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw3 /data/mirror/gpseg5 21002
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw3 /data/primary/gpseg6 20000
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw1 /data/mirror/gpseg6 21000
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw3 /data/primary/gpseg7 20001
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw1 /data/mirror/gpseg7 21001
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw3 /data/primary/gpseg8 20002
20190403:02:57:05:011030 gpstate:cdw:gpadmin-[INFO]:- sdw1 /data/mirror/gpseg8 21002
Additional LightDB-A Database network connections are created for features such as standby replication, segment mirroring, statistics collection, and data exchange between segments. Some persistent connections are established when the database starts up and other transient connections are created during operations such as query execution. Transient connections for query execution processes, data movement, and statistics collection use available ports in the range 1025 to 65535 with both TCP and UDP protocols.
Note To avoid port conflicts between LightDB-A Database and other applications when initializing LightDB-A Database, do not specify LightDB-A Database ports in the range specified by the operating system parameter
net.ipv4.ip_local_port_range. For example, ifnet.ipv4.ip_local_port_range = 10000 65535, you could set the LightDB-A Database base port numbers to values outside of that range:
PORT_BASE = 6000
MIRROR_PORT_BASE = 7000
Some add-on products and services that work with LightDB-A Database have additional networking requirements. The following table lists ports and protocols used within the LightDB-A cluster, and includes services and applications that integrate with LightDB-A Database.
| Service | Protocol/Port | Description |
|---|---|---|
| Coordinator SQL client connection | TCP 5432, libpq | SQL client connection port on the LightDB-A coordinator host. Supports clients using the PostgreSQL libpq API. Configurable. |
| Segment SQL client connection | varies, libpq | The SQL client connection port for a segment instance. Each primary and mirror segment on a host must have a unique port. Ports are assigned when the LightDB-A system is initialized or expanded. The gp_segment_configuration system catalog records port numbers for each primary (p) or mirror (m) segment in the port column. Run gpstate -p to view the ports in use. |
| Segment mirroring port | varies, libpq | The port where a segment receives mirrored blocks from its primary. The port is assigned when the mirror is set up. The gp_segment_configuration system catalog records port numbers for each primary (p) or mirror (m) segment in the port column. Run gpstate -p to view the ports in use. |
| LightDB-A Database Interconnect | UDP 1025-65535, dynamically allocated | The Interconnect transports database tuples between LightDB-A segments during query execution. |
| Standby coordinator client listener | TCP 5432, libpq | SQL client connection port on the standby coordinator host. Usually the same as the coordinator client connection port. Configure with the gpinitstandby utility -P option. |
| Standby coordinator replicator | TCP 1025-65535, gpsyncmaster | The gpsyncmaster process on the coordinator host establishes a connection to the secondary coordinator host to replicate the coordinator’s log to the standby coordinator. |
| LightDB-A Database file load and transfer utilities: gpfdist, gpload. | TCP 8080, HTTP TCP 9000, HTTPS |
The gpfdist file serving utility can run on LightDB-A hosts or external hosts. Specify the connection port with the -p option when starting the server.The gpload utility runs one or more instances of gpfdist with ports or port ranges specified in a configuration file. |
| Backup completion notification | TCP 25, TCP 587, SMTP | The gpbackup backup utility can optionally send email to a list of email addresses at completion of a backup. The SMTP service must be enabled on the LightDB-A coordinator host. |
| LightDB-A Database secure shell (SSH): gpssh, gpsync, gpssh-exkeys, gppkg | TCP 22, SSH | Many LightDB-A utilities use rsync and ssh to transfer files between hosts and manage the LightDB-A system within the cluster. |
| LightDB-A Platform Extension Framework (PXF) | TCP 5888 | The PXF Java service runs on port number 5888 on each LightDB-A Database segment host. |
| LightDB-A Command Center (GPCC) | TCP 28080, HTTP/HTTPS, WebSocket (WS), Secure WebSocket (WSS) | The GPCC web server (gpccws process) runs on the LightDB-A Database coordinator host or standby coordinator host. The port number is configured at installation time. |
| LightDB-A Command Center (GPCC) | TCP 8899, rcp port | A GPCC agent (ccagent process) on each LightDB-A Database segment host connects to the GPCC rpc backend at port number 8899 on the GPCC web server host. |
| LightDB-A Command Center (GPCC) | UNIX domain socket, agent | LightDB-A Database processes transmit datagrams to the GPCC agent (ccagent process) on each segment host using a UNIX domain socket. |
| GPText | TCP 2188 (base port) | ZooKeeper client ports. ZooKeeper uses a range of ports beginning at the base port number. The base port number and maximum port number are set in the GPText installation configuration file at installation time. The default base port number is 2188. |
| GPText | TCP 18983 (base port) | GPText (Apache Solr) nodes. GPText nodes use a range of ports beginning at the base port number. The base port number and maximum port number are set in the GPText installation configuration file at installation time. The default base port number is 18983. |
| EMC Data Domain and DD Boost | TCP/UDP 111, NFS portmapper | Used to assign a random port for the mountd service used by NFS and DD Boost. The mountd service port can be statically assigned on the Data Domain server. |
| EMC Data Domain and DD Boost | TCP 2052 | Main port used by NFS mountd. This port can be set on the Data Domain system using the nfs set mountd-port command . |
| EMC Data Domain and DD Boost | TCP 2049, NFS | Main port used by NFS. This port can be configured using the nfs set server-port command on the Data Domain server. |
| EMC Data Domain and DD Boost | TCP 2051, replication | Used when replication is configured on the Data Domain system. This port can be configured using the replication modify command on the Data Domain server. |
Parent topic: LightDB-A Database Security Configuration Guide