Memcached not working

[urbaman]

Hi,

Installed the operator and a 3-replica dragonfly instance.

apiVersion: dragonflydb.io/v1alpha1
kind: Dragonfly
metadata:
  labels:
    app.kubernetes.io/name: dragonfly
  name: dragonfly-db
  namespace: dragonfly-db
spec:
  replicas: 3
  memcachedPort: 11211
  nodeSelector:
    workload: database
  resources:
    requests:
      cpu: 500m
      memory: 500Mi
    limits:
      cpu: 600m
      memory: 750Mi

Redis seems to work:

kubectl run -it --rm --restart=Never redis-cli --image=redis -- bash
All commands and output from this session will be recorded in container logs, including credentials and sensitive information passed through the command prompt.
If you don't see a command prompt, try pressing enter.
root@redis-cli:/data# redis-cli -h dragonfly-db.dragonfly-db                  
dragonfly-db.dragonfly-db:6379> ping
PONG
dragonfly-db.dragonfly-db:6379>

Memcached does not, only stats seems to work:

kubectl port-forward -n dragonfly-db svc/dragonfly-db 11211:11211
Forwarding from 127.0.0.1:11211 -> 11211
Forwarding from [::1]:11211 -> 11211
Handling connection for 11211

telnet localhost 11211
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
SET my_key_db_ZERO 1000
ERROR
^[[A^[[B
ERROR
set foo 1000
ERROR
stats   
STAT pid 7
STAT uptime 1883
STAT time 1769296203
STAT version v1.35.0
STAT libevent epoll
STAT pointer_size 8
STAT rusage_user 14.0218
STAT rusage_system 11.3836
STAT max_connections -1
STAT curr_connections 5
STAT total_connections -1
STAT rejected_connections -1
STAT bytes_read 61846
STAT bytes_written 11026
STAT limit_maxbytes -1
END
SET foo bar
ERROR
select 1
ERROR
select 0
ERROR
R
ERROR
^R
keys *
ERROR
mg foo f v\r\n
EN
VA 2 f30\r\n
ERROR
hi\r\n
ERROR
mg foo f c v N30\r\n
ERROR
ms foo 3 C999
 new\r\nERROR

ERROR

ERROR
ms foo 3 C999
ERROR
ms foo 3
ERROR
mg foo f c v
ERROR

Master replica logs:

kubectl logs -n dragonfly-db dragonfly-db-0
                   .--::--.                   
   :+*=:          =@@@@@@@@=          :+*+:   
  %@@@@@@%*=.     =@@@@@@@@-     .=*%@@@@@@#  
  @@@@@@@@@@@@#+-. .%@@@@#. .-+#@@@@@@@@@@@%  
  -@@@@@@@@@@@@@@@@*:#@@#:*@@@@@@@@@@@@@@@@-  
    :+*********####-%@%%@%-####********++.    
   .%@@@@@@@@@@@@@%:@@@@@@:@@@@@@@@@@@@@@%    
   .@@@@@@@@%*+-:   =@@@@=  .:-+*%@@@@@@@%.   
     =*+-:           ###*          .:-+*=     
                     %@@%                     
I20260124 22:38:40.582020     7 init.cc:127] dragonfly running in opt mode.
I20260124 22:38:40.582193     7 dfly_main.cc:902] Starting dragonfly df-v1.35.0-67c51eb70c5aa16e38ddaa906689e7aa31037590
                     *@@*                     
                     +@@=                     
                     :##:                     
                     :@@:                     
                      @@                      
                      ..                      
* Logs will be written to the first available of the following paths:
/tmp/dragonfly.*
./dragonfly.*
* For the available flags type dragonfly [--help | --helpfull]
* Documentation can be found at: https://www.dragonflydb.io/docs
I20260124 22:38:40.582530     7 dfly_main.cc:944] maxmemory has not been specified. Deciding myself....
I20260124 22:38:40.582551     7 dfly_main.cc:953] Found 750.00MiB available memory. Setting maxmemory to 600.00MiB
W20260124 22:38:40.582613     7 dfly_main.cc:398] Weird error 1 switching to epoll
I20260124 22:38:40.583245     7 proactor_pool.cc:149] Running 1 io threads
I20260124 22:38:40.588227     7 dragonfly_listener.cc:150] SSL version: OpenSSL 3.0.17 1 Jul 2025
I20260124 22:38:40.588810     7 dfly_main.cc:298] Listening on admin socket any:9999
I20260124 22:38:40.590649     7 server_family.cc:1092] Host OS: Linux 6.18.2-talos x86_64 with 1 threads
I20260124 22:38:40.592049     7 snapshot_storage.cc:186] Load snapshot: Searching for snapshot in directory: "/data"
W20260124 22:38:40.592132     7 server_family.cc:1192] Load snapshot: No snapshot found
I20260124 22:38:40.671689    12 listener_interface.cc:102] sock[5] AcceptServer - listening on 0.0.0.0:9999
I20260124 22:38:40.671731    12 listener_interface.cc:102] sock[6] AcceptServer - listening on 0.0.0.0:6379
I20260124 22:38:40.671753    12 listener_interface.cc:102] sock[7] AcceptServer - listening on 0.0.0.0:11211
I20260124 22:38:40.958863    12 version_monitor.cc:174] Your current version '1.35.0' is not the latest version. A newer version '1.36.0' is now available. Please consider an update.
I20260124 22:38:53.063741    12 server_family.cc:3647] Initiate replication with: NO ONE
I20260124 22:39:07.753708    12 dflycmd.cc:749] Registered replica 10.244.8.93:6379
I20260124 22:39:07.761173    12 dflycmd.cc:366] Started sync with replica 10.244.8.93:6379
I20260124 22:39:07.763728    12 dflycmd.cc:423] Transitioned into stable sync with replica 10.244.8.93:6379
I20260124 22:39:22.604485    12 dflycmd.cc:749] Registered replica 10.244.9.153:6379
I20260124 22:39:22.613476    12 dflycmd.cc:366] Started sync with replica 10.244.9.153:6379
I20260124 22:39:22.615561    12 dflycmd.cc:423] Transitioned into stable sync with replica 10.244.9.153:6379
W20260124 23:19:23.796795    12 memcache_parser.cc:281] unknown meta flag: N30\r\n
W20260124 23:20:01.067701    12 memcache_parser.cc:281] unknown meta flag: C999

Am I forgetting something important?