Uploaded image for project: 'Couchbase Kubernetes'
  1. Couchbase Kubernetes
  2. K8S-389

Ability to Set Ulimits

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Details

    • Improvement
    • Status: Open
    • Minor
    • Resolution: Unresolved
    • 0.8.0, 1.0.0
    • not-targeted
    • kubernetes

    Description

      For Production we recommend setting ulmits

      docker run -d --ulimit nofile=40960:40960 --ulimit core=100000000:100000000 --ulimit memlock=100000000:100000000 --name db -p 8091-8094:8091-8094 -p 11210:11210 couchbase

       

      However there doesn't appear to be a way to pass these Args into the container from Pod. It appears support for this is still pending in kubernetes core.  https://github.com/kubernetes/kubernetes/issues/3595#issuecomment-378120067

       

      Here are the default ulimits set (minkube deployment)

      ulimit -a
      		 
       
      		 
      core file size          (blocks, -c) unlimited
      		 
       
      		 
      data seg size           (kbytes, -d) unlimited
      		 
       
      		 
      scheduling priority             (-e) 0
      		 
       
      		 
      file size               (blocks, -f) unlimited
      		 
       
      		 
      pending signals                 (-i) 23096
      		 
       
      		 
      max locked memory       (kbytes, -l) 64
      		 
       
      		 
      max memory size         (kbytes, -m) unlimited
      		 
       
      		 
      open files                      (-n) 1048576
      		 
       
      		 
      pipe size            (512 bytes, -p) 8
      		 
       
      		 
      POSIX message queues     (bytes, -q) 819200
      		 
       
      		 
      real-time priority              (-r) 0
      		 
       
      		 
      stack size              (kbytes, -s) 8192
      		 
       
      		 
      cpu time               (seconds, -t) unlimited
      		 
       
      		 
      max user processes              (-u) unlimited
      		 
       
      		 
      virtual memory          (kbytes, -v) unlimited
      		 
       
      		 
      file locks                      (-x) unlimited

       

      Maxfiles should be unlimited, but is 64!

      As this can cause issues under heavy load we'll need to figure out the way to set limits.

       

      Attachments

        Issue Links

          relates to

          Task - A task that needs to be done. K8S-454 Document ulimit settings for Kubernetes node

          • Major - Major loss of function.
          • Resolved
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            tommie Tommie McAfee created issue -
            simon.murray Simon Murray made changes -
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            mikew Mike Wiederhold [X] (Inactive) made changes -
            Link This issue relates to K8S-454 [ K8S-454 ]
            mikew Mike Wiederhold [X] (Inactive) made changes -
            Fix Version/s 1.1.0 [ 15163 ]
            Fix Version/s 1.0.0 [ 15036 ]
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            Fix Version/s 1.2.0 [ 15308 ]
            Fix Version/s 1.1.0 [ 15163 ]
            mikew Mike Wiederhold [X] (Inactive) made changes -
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            simon.murray Simon Murray made changes -
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            mikew Mike Wiederhold [X] (Inactive) made changes -
            Fix Version/s bug-backlog [ 14924 ]
            Fix Version/s 1.2.0 [ 15308 ]
            mikew Mike Wiederhold [X] (Inactive) made changes -
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            simon.murray Simon Murray made changes -
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            simon.murray Simon Murray made changes -
            Fix Version/s not-targeted [ 16613 ]
            Fix Version/s not-targeted [ 16613 ]
            Fix Version/s bug-backlog [ 14924 ]
            simon.murray Simon Murray made changes -
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            simon.murray Simon Murray made changes -
            Issue Type Bug [ 1 ] Improvement [ 4 ]
            Summary Unable to set Pod Ulimits Ability to Set Ulimits
            simon.murray Simon Murray made changes -
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            simon.murray Simon Murray made changes -
            Priority Major [ 3 ] Minor [ 4 ]
            simon.murray Simon Murray made changes -
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              tommie Tommie McAfee
              tommie Tommie McAfee
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