ctdb.sysconfig man page

ctdb.sysconfig — CTDB daemon configuration file

Description

This file contains configuration that affects the operation of CTDB. This is a distribution-specific service configuration file such as /etc/sysconfig/ctdb (Red Hat) or /etc/default/ctdb (Debian) and is a shell script (see sh(1)).

Global Configuration

CTDB_INIT_STYLE=debian|redhat|suse

This is the init style used by the Linux distribution (or other operating system) being used. This is usually determined dynamically by checking the system. This variable is used by the initscript to determine which init system primitives to use. It is also used by some eventscripts to choose the name of initscripts for certain services, since these can vary between distributions.

If using CTDB's event scripts are unable to determine an appropriate default then this option can also be placed in a relevant ctdb-script.options(5) file.

Default: NONE. Guessed, based on features of distribution.

CTDB_STARTUP_TIMEOUT=NUM

NUM is the number of seconds to wait for ctdbd(1) complete early initialisation up to a point where it is unlikely to abort. If ctdbd doesn't complete the "setup" event before this timeout then it is killed.

Defaults: 10

Resource Limits

Maximum number of open files

CTDB can use a lot of file descriptors, especially when used with Samba. If there are thousands of smbd processes connected to CTDB when this can mean that thousands of file descriptors are used. For CTDB, it is often necessary to increase limit on the maximum number of open files.

The maximum number of open files should be configured using an operating system mechanism.

systemd

The LimitNOFILE=LIMIT option can be used in a unit/service file increase the maximum number of open files. See systemd.exec(5) for details.

SYSV init

Use a command like ulimit -n LIMIT to increase the maximum number of open files. This command can be put in the relevant distribution-specific service configuration file.

Allowing core dumps

Many distributions do not allow core dump files to be generated by default. To assist with debugging, core files can be enabled. This should be configured using an operating system mechanism.

systemd

The LimitCORE=0|unlimited option can be used in a unit/service file. 0 disallows core files, unlimited allows them. maximum number of open files. See systemd.exec(5) for details.

SYSV init

Use a command like ulimit -c 0|unlimited to disable or enable core files as required. This command can be put in the relevant distribution-specific service configuration file.

Files

/etc/sysconfig/ctdb
/etc/default/ctdb
/etc/ctdb/script.options

See Also

ctdbd(1), ctdb-script.options(5), ctdb(7), http://ctdb.samba.org/

Author

This documentation was written by Martin Schwenke

Referenced By

ctdb(7), ctdb.conf(5), ctdbd_wrapper(1).

11/28/2018 ctdb CTDB - clustered TDB database