Everyday I get an error email from my python flask app with the following error:

WriteError: error 5 from memcached_set: (54648992) SERVER HAS FAILED

Memcached is running and the address is set up to on both the client and the server. When I manually check connection it seems just fine. It only happens periodically.

~ cat /etc/memcached.conf:

# memcached default config file
# 2003 - Jay Bonci <jaybonci@debian.org>
# This configuration file is read by the start-memcached script provided as
# part of the Debian GNU/Linux distribution. 

# Run memcached as a daemon. This command is implied, and is not needed for the
# daemon to run. See the README.Debian that comes with this package for more
# information.

# Log memcached's output to /var/log/memcached
logfile /var/log/memcached.log

# Be verbose
# -v

# Be even more verbose (print client commands as well)
# -vv

# Start with a cap of 64 megs of memory. It's reasonable, and the daemon default
# Note that the daemon will grow to this size, but does not start out holding this much
# memory
-m 64

# Default connection port is 11211
-p 11211 

# Run the daemon as root. The start-memcached will default to running as root if no
# -u command is present in this config file
-u memcache

# Specify which IP address to listen on. The default is to listen on all IP addresses
# This parameter is one of the only security measures that memcached has, so make sure
# it's listening on a firewalled interface.

# Limit the number of simultaneous incoming connections. The daemon default is 1024
# -c 1024

# Lock down all paged memory. Consult with the README and homepage before you do this
# -k

# Return error when memory is exhausted (rather than removing items)
# -M

# Maximize core file limit
# -r

/var/log/memcached.log is empty.

  • May be you've just ran out of the connections on the memcached, the default limit is 1024. Monitor the connection amount and increase it if necessary. – drookie Apr 8 '17 at 10:21
  • @drookie, how would I be able to monitor that? – TheOne Apr 10 '17 at 15:35

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