CUBRID Environment Variables¶

• CUBRID: The default environment variable that designates the location where the CUBRID is installed. This variable must be set accurately since all programs included in the CUBRID system uses this environment variable as reference.
• CUBRID_DATABASES: The environment variable that designates the location of the databases.txt file. The CUBRID system stores the absolute path of database volumes in the $CUBRID_DATABASES/databases.txt file. See databases.txt File.
• CUBRID_MSG_LANG: The environment variable that specifies usage messages and error messages in CUBRID. The initial value upon start is not defined. If it is not defined, it follows the configured locale when Creating Database. For more information, see Language & Charset Setting.

• CUBRID_TMP: The environment variable that specifies the location where the cub_master process and the cub_broker process store the UNIX domain socket file in CUBRID for Linux. If it is not specified, the cub_master process stores the UNIX domain socket file under the /tmp directory and the cub_broker process stores the UNIX domain socket file under the $CUBRID/var/CUBRID_SOCK directory (not used in CUBRID for Windows).

CUBRID_TMP value has some constraints, which are as follows:

• Since the maximum length of the UNIX socket path is 108, when a path longer than 108 is entered in $CUBRID_TMP, an error is displayed.

  $ export CUBRID_TMP=/home1/testusr/cubrid=/tmp/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
  $ cubrid server start apricot
  
  The $CUBRID_TMP is too long. (/home1/testusr/cubrid=/tmp/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789)
  

• When the relative path is entered, an error is displayed.

  $ export CUBRID_TMP=./var
  $ cubrid server start testdb
  
  The $CUBRID_TMP should be an absolute path. (./var)
  

CUBRID_TMP can be used to avoid the following problems that can occur at the default path of the UNIX domain socket that CUBRID uses.

• /tmp is used to store the temporary files in Linux. If the system administrator periodically and voluntarily cleans the space, the UNIX domain socket may be removed. In this case, configure $CUBRID_TMP to another path, not /tmp.
• The maximum length of the UNIX socket path is 108. When the installation path of CUBRID is too long and the $CUBRID/var/CUBRID_SOCK path that store the UNIX socket path for cub_broker exceeds 108 characters, the broker cannot be executed. Therefore, the path of $CUBRID_TMP must not exceed 1008 characters.

The above mentioned environment variables are set when the CUBRID is installed. However, the following commands can be used to verify the setting.

• Linux

  % printenv CUBRID
  % printenv CUBRID_DATABASES
  % printenv CUBRID_MSG_LANG
  % printenv CUBRID TMP
  

• Windows

  C:\> set CUBRID
  

OS Environment and Java Environment Variables¶

• PATH: In the Linux environment, the directory $CUBRID/bin, which includes a CUBRID system executable file, must be included in the PATH environment variable.
• LD_LIBRARY_PATH: In the Linux environment, $CUBRID/lib, which is the CUBRID system's dynamic library file (libjvm.so), must be included in the LD_LIBRARY_PATH (or SHLIB_PATH or LIBPATH) environment variable.
• Path: In the Windows environment, the %CUBRID%\bin, which is a directory that contains CUBRID system's execution file, must be included in the Path environment variable.
• JAVA_HOME: To use the Java stored procedure in the CUBRID system, the Java Virtual Machine (JVM) version 1.6 or later must be installed, and the JAVA_HOME environment variable must designate the concerned directory. See the Environment Configuration for Java Stored Function/Procedure.

Configuring the Environment Variable¶

For Windows

If the CUBRID system has been installed on Windows, then the installation program automatically sets the necessary environment variable. Select [Systems Properties] in [My Computer] and select the [Advanced] tab. Click the [Environment Variable] button and check the setting in the [System Variable]. The settings can be changed by clicking on the [Edit] button. See the Windows help for more information on how to change the environment variable on Windows.

For Linux

If the CUBRID system has been installed on Linux, the installation program automatically creates the .cubrid.sh or .cubrid.csh file and makes configurations so that the files are automatically called from the installation account's shell log-in script. The following is the contents of . cubrid.sh environment variable configuration that was created in an environment that uses sh, bash, etc.

CUBRID=/home1/cub_user/CUBRID
CUBRID_DATABASES=/home1/cub_user/CUBRID/databases
ld_lib_path=`printenv LD_LIBRARY_PATH`

if [ "$ld_lib_path" = "" ]
then
    LD_LIBRARY_PATH=$CUBRID/lib
else
    LD_LIBRARY_PATH=$CUBRID/lib:$LD_LIBRARY_PATH
fi

SHLIB_PATH=$LD_LIBRARY_PATH
LIBPATH=$LD_LIBRARY_PATH
PATH=$CUBRID/bin:$CUBRID/cubridmanager:$PATH

export CUBRID
export CUBRID_DATABASES
export LD_LIBRARY_PATH
export SHLIB_PATH
export LIBPATH
export PATH

Language & Charset Setting¶

The language and the charset that will be used in the CUBRID DBMS is specified after the database name when DB is created(e.g. cubrid createdb testdb ko_KR.utf8). The following are examples of values that can currently be set as a language and a charset.

• en_US.iso88591: English ISO-88591 encoding(.iso88591 can be omitted)
• ko_KR.euckr: Korean EUC-KR encoding
• ko_KR.utf8: Korean UTF-8 encoding(.utf8 can be omitted)
• de_DE.utf8: German UTF-8 encoding
• es_ES.utf8: Spanish UTF-8 encoding
• fr_FR.utf8: French UTF-8 encoding
• it_IT.utf8: Italian UTF-8 encoding
• ja_JP.utf8: Japanese UTF-8 encoding
• km_KH.utf8: Cambodian UTF-8 encoding
• tr_TR.utf8: Turkish UTF-8 encoding(.utf8 can be omitted)
• vi_VN.utf8: Vietnamese UTF-8 encoding
• zh_CN.utf8: Chinese UTF-8 encoding
• ro_RO.utf8: Romanian UTF-8 encoding

Language and charset setting of CUBRID affects read and write data. The language is used for messages displayed by the program.

For more details related to charset, locale and collation settings, see Globalization.

Default Ports for CUBRID¶

The following table summarizes the ports required for each OS, based on the listening processes. Each port on the listener should be opened.

(*): The machine which has the CAS or CSQL process

(**): The machine which has the cub_server

As the server process (cub_server) and the client processes (CAS, CSQL) cross-check if the opposite node is normally running or not by using the ECHO(7) port, you should open the ECHO(7) port if there is a firewall. If the ECHO port cannot be opened for both the server and the client, set the check_peer_alive parameter value of the cubrid.conf to none.

The relation of connection between processes is as follows:

application - cub_broker
            -> CAS  -  cub_master
                    -> cub_server

• application: The application process
• cub_broker: The broker server process. It selects CAS to connect with the application.
• CAS: The broker application server process. It relays the application and the cub_server.
• cub_master: The master process. It selects the cub_server to connect with the CAS.
• cub_server: The database server process

The symbols of relation between processes and the meaning are as follows:

• - : Indicates that the connection is made only once for the initial.
• ->, <- : Indicates that the connection is maintained. The right side of -> or the left side of <- is the party that the arrow symbol indicates. The party that the arrow symbol indicates is the listener which listens to the opposite process.
• (master): Indicates the master node in the HA configuration.
• (slave): Indicates the slave node in the HA configuration.

The connection process between the application and the DB is as follows:

1. The application tries to connect to the cub_broker through the broker port (BROKER_PORT) set in the cubrid_broker.conf.

2. The cub_broker selects a connectable CAS.

3. The application and CAS are connected.

   In Linux, BROKER_PORT, which is used as an application, is connected to CAS through the Unix domain socket. In Windows, since the Unix domain socket cannot be used, an application and CAS are connected through a port of which the number is the sum of the corresponding CAS ID and the APPL_SERVER_PORT value set in the cubrid_broker.conf. If the APPL_SERVER_PORT value has not been set, the port value connected to the first CAS is BROKER_PORT + 1.

   For example, if the BROKER_PORT is 33000 and the APPL_SERVER_PORT value has not been set in Windows, the ports used between the application and CAS are as follows:

   • The port used to connect the application to the CAS(1): 33001
   • The port used to connect the application to the CAS(2): 33002
   • The port used to connect the application to the CAS(3): 33003

4. CAS sends a request of connecting with the cub_server to the cub_master through the cubrid_port_id port set in the cubrid.conf.

5. CAS and the cub_server are connected.

   In Linux, you should use the cubrid_port_id port as CAS is connected to the cub_server through the Unix domain socket. In Windows, CAS is connected to the cub_server through a random available port as the Unix domain socket cannot be used. If the DB server is running in Windows, a random available port is used between the broker machine and the DB server machine. In this case, note that the operation may not be successful if a firewall blocks the port for the process between the two machines.

6. After that, CAS keeps connection with the cub_server even if the application is terminated until the CAS restarts.

Ports for CUBRID HA¶

The CUBRID HA is supported in Linux only.

The following table summarizes the ports required for each OS, based on the listening processes. Each port on the listener should be opened.

(*): The machine which has the CAS, CSQL, copylogdb, or applylogdb process

(**): The machine which has the cub_server

As the server process (cub_server) and the client processes (CAS, CSQL, copylogdb, applylogdb, etc.) cross-check if the opposite node is normally running or not by using the ECHO(7) port, you should open the ECHO(7) port if there is a firewall. If the ECHO port cannot be opened for both the server and the client, set the ref:check_peer_alive <check_peer_alive> parameter value of the cubrid.conf to none.

The relation of connection between processes is as follows:

application - cub_broker
            -> CAS  -  cub_master(master) <-> cub_master(slave)
                    -> cub_server(master)     cub_server(slave) <- applylogdb(slave)
                                          <----------------------- copylogdb(slave)

• cub_master(master): the master process on the master node in the CUBRID HA configuration. It checks if the peer node is alive.
• cub_master(slave): the master process on the slave node in the CUBRID HA configuration. It checks if the peer node is alive.
• copylogdb(slave): the process which copies the replication log on the slave node in the CUBRID HA configuration
• applylogdb(slave): the process which applies the replication log on the slave node in the CUBRID HA configuration

For easy understanding for the replication process from the master node to the slave node, the applylogdb and copylogdb on the master node and CAS on the slave node have been omitted.

The symbols of relation between processes and the meaning are as follows:

• - : Indicates that the connection is made only once for the initial.
• ->, <- : Indicates that the connection is maintained. The right side of -> or the left side of <- is the party that the arrow symbol indicates. The party that the arrow symbol indicates is the listener which listens to the opposite process.
• (master): Indicates the master node in the HA configuration.
• (slave): Indicates the slave node in the HA configuration.

The connection process between the application and the DB is identical with Default Ports for CUBRID. This section describes the connection process between the master node and the slave node when the master DB and the slave DB are configured 1:1 by the CUBRID HA.

1. The ha_port_id set in the cubrid_ha.conf is used between the cub_master(master) and the cub_master(slave).
2. The copylogdb(slave) sends a request for connecting with the master DB to the cub_master(master) through the port set in the cubrid_port_id of the cubrid.conf on the slave node. Finally, the copylogdb(slave) is connected with the cub_server(master).
3. The applylogdb(slave) sends a request for connecting with the slave DB to the cub_master(slave) through the port set in the cubrid_port_id of the cubrid.conf on the slave node. Finally, the applylogdb(slave) is connected with the cub_server(slave).

On the master node, the applylogdb and the copylogdb run for the case that the master node is switched to the slave node.

Ports for CUBRID SHARD¶

CUBRID SHARD is supported only on Linux.

The following table summarizes the ports required for each OS, based on the listening processes. Each port on the listener should be opened.

The connection process between the application and the server for the CUBRID SHARD configuration is as follows. The CAS and the cub_proxy have already been connected when starting the CUBRID SHARD (cubrid broker start).

1. The application tries to connect with the cub_broker through the BROKER_PORT set in the cubrid_broker.conf.

2. The cub_broker selects the connectable cub_proxy.

3. The application and the cub_proxy are connected. The number of the cub_proxy are determined by SHARD_NUM_PROXY of the cubrid_broker.conf.

   In Linux, the application is connected to the cub_proxy through the Unix domain socket. In Windows, the application is connected to the cub_proxy through the port calculated based on BROKER_PORT and SHARD_NUM_PROXY set in the cubrid_broker.conf of each cub_proxy as the Unix domain socket cannot be used.

   For example, in Linux, if BROKER_PORT is 45000 and SHARD_NUM_PROXY is 3, only one port is used: 45000.

   • The port used to connect the application to the cub_proxy(1): 45000, the port used to connect the CAS to the cub_proxy(1): None
   • The port used to connect the application to the cub_proxy(2): 45000, the port used to connect the CAS to the cub_proxy(2): None
   • The port used to connect the application to the cub_proxy(3): 45000, the port used to connect the CAS to the cub_proxy(3): None

4. The CAS and the cub_proxy have already been connected when starting the CUBRID SHARD (cubrid broker start). In addition, the processes are always in one machine, requiring no remote access.

   When the CAS is connected to the cub_proxy, the Unix domain socket is used in Linux. Multiple CASes can be connected to one cub_proxy. The minimum number and the maximum number of the CAS are determined by MIN_NUM_APPL_SERVER and MAX_NUM_APPL_SERVER of the cubrid_broker.conf. The maximum number of CASes which can be connected to one cub_proxy simultaneously is determined based on SHARD_MAX_CLIENTS of the cubrid_broker.conf.

Ports for CUBRID Web Manager and CUBRID Manager Server¶

The following table summarizes the ports, based on the listening processes, used for the CUBRID Web Manager and the CUBRID Manager server. The ports are identical regardless of the OS type.

• The port used when the CUBRID Manager client accesses the CUBRID Manager server process is cm_port of the cm.conf. The default value is 8001.
• The port used when the CUBRID Web Manager client accesses the CUBRID Web Manager server process is also cm_port of the cm.conf.