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EnvironmentVariables.md

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Environment variables

The memcached project use environment variables to tune the behaviour of the system (both for test programs and in production).

This document tries to list all the environment variables in use, and what they're used for.

BADMALLOC_FAILURE_RATIO

This is a floating point and may be used to configure how often malloc() / realloc() should return NULL.

This setting is only used if the BadMalloc allocator hook is enabled.

BADMALLOC_GRACE_PERIOD

This is an unsigned integer used to allow the first N calls to malloc() / realloc() to succeed.

This setting is only used if the BadMalloc allocator hook is enabled.

BADMALLOC_SEED

This is an unsigned integer used to specify a fixed seed for the random number generator which controls when to fail.

This setting is only used if the BadMalloc allocator hook is enabled.

CBSASL_PWFILE

CBSASL_PWFILE is used to tell cbsasl the location of the password database in JSON format.

CONFIG_TEST_MOCK_MALLOC_FAILURE

This variable is used by a unit test to have the config library simulate a memory allocation failure.

CONFIG_TEST_MOCK_SPOOL_FAILURE

This variable is used by a unit test to have the config library simulate a failure reading stuff from disk.

COUCHBASE_PACKET_DUMP

Some of the command line tools will generate a packet dump if this variable is set.

COUCHBASE_SSL_CIPHER_LIST

Specify the list of ciphers allowed.

MEMCACHED_CRASH_TEST

Variable set to identify that we're running the crash test (and allows) loading of the crash engine.

MEMCACHED_NUM_CPUS

The number of CPU's to use for frontend threads.

MEMCACHED_NUMA_MEM_POLICY

The NUMA memory to use.

MEMCACHED_UNIT_TESTS

Set to indicate that we're running unit tests

MEMCACHED_DEBUG_STOP

Set to request memcached to stop (via SIGSTOP) at startup.

RUN_UNDER_VALGRIND

Set to indicate that we're running under valgrind

T_MEMD_INITIAL_MALLOC

Used to fake a memory allocation in "default_bucket" (should not be used)

T_MEMD_SLABS_ALLOC

Used to tell "default_bucket" to preallocate memory (should not be used)

TESTAPP_ATTEMPTS

May be used to tell engine_testapp to retry failed tests.

TESTAPP_ENABLE_COLOR

May be set to let engine_testapp use colors in its output.

CB_MAXIMIZE_LOGGER_CYCLE_SIZE

If set the logger will use 1GB file sizes

TESTAPP_PACKET_DUMP

By setting this variable testapp dumps data sent/received in the old-style tests in the following format:

PLAIN> 0x80, 0xfd, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00, ...
PLAIN< 0x81, 0xfd, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, ...

MEMCACHED_ENABLE_COMMAND_LOGGING

If set memcached logs execution of each command