unable to connect via unix socket

[zafarella]

snip of 'app/etc/local.xml'

<cache>
  <backend>Cm_Cache_Backend_Redis</backend>
  <backend_options>
    <server><![CDATA[/tmp/redis6380.sock]]></server> <!-- or absolute path to unix socket -->
    <!-- <port>6380</port> -->
    <persistent></persistent> <!-- Specify unique string to enable persistent connections. E.g.: sess-db0; bugs with phpredis and php-fpm are known: https://github.com/nicolasff/phpredis/issues/70 -->
    <database>2</database> <!-- Redis database number; protection against accidental data loss is improved by not sharing databases -->
    <password></password> <!-- Specify if your Redis server requires authentication -->
    <force_standalone>1</force_standalone>  <!-- 0 for phpredis, 1 for standalone PHP -->
    <connect_retries>1</connect_retries>    <!-- Reduces errors due to random connection failures; a value of 1 will not retry after the first failure -->
    <read_timeout>10</read_timeout>         <!-- Set read timeout duration; phpredis does not currently support setting read timeouts -->
    <automatic_cleaning_factor>0</automatic_cleaning_factor> <!-- Disabled by default -->
    <compress_data>1</compress_data>  <!-- 0-9 for compression level, recommended: 0 or 1 -->
    <compress_tags>1</compress_tags>  <!-- 0-9 for compression level, recommended: 0 or 1 -->
    <compress_threshold>20480</compress_threshold>  <!-- Strings below this size will not be compressed -->
    <compression_lib>gzip</compression_lib> <!-- Supports gzip, lzf, lz4 (as l4z) and snappy -->
    <use_lua>0</use_lua> <!-- Set to 1 if Lua scripts should be used for some operations -->
  </backend_options>
</cache>

Redis is running and listening on unix socket:

port 0
 unixsocket /tmp/redis6380.sock

However, socket connection works fine with redis itself:

redis-benchmark -q -n 10000 -s /tmp/redis6380.sock
PING_INLINE: 54945.05 requests per second
PING_BULK: 70422.53 requests per second
SET: 81300.81 requests per second
GET: 72463.77 requests per second
INCR: 66666.66 requests per second
LPUSH: 60606.06 requests per second
LPOP: 59171.60 requests per second
SADD: 63694.27 requests per second
SPOP: 81300.81 requests per second
LPUSH (needed to benchmark LRANGE): 88495.58 requests per second
LRANGE_100 (first 100 elements): 38461.54 requests per second
LRANGE_300 (first 300 elements): 12091.90 requests per second
LRANGE_500 (first 450 elements): 5592.84 requests per second
LRANGE_600 (first 600 elements): 9737.10 requests per second
MSET (10 keys): 54945.05 requests per second

Magento log contains following:

ERR (3): Notice: Undefined index: port  in /home/username/public_html/lib/Cm/Cache/Backend/Redis.php on line 96

and

a:4:{i:0;s:44:"Connection to Redis failed after 2 failures.";i:1;s:1473:"#0 /home/username/public_html/lib/Credis/Client.php(362): Credis_Client->connect() 

If I missed something or misunderstood, please correct me. loca.xml setting - specifying the socket with no CDATA results same.

Thanks in advance for help and btw great thing :+1:

[colinmollenhour]

The PHP notice was addressed in 19155619 so please update to the latest and close the ticket if it resolves your issue.

[zafarella]

Patched mentioned file - same issue.