FAQ
Hi All,

I have few queries related to ZeroMQ and Salt communication.


    - How does the bi-directional communication happens between Master and
    minions?
    - Does Linux system (on minions ) allows bi-directional communication
    with master without opening any port with the help of ZeroMQ? so now I'm
    wondering how it works?

As it requires to open ports 4505 and 4506 on Master, but not on minions.

Does the minions continuously sends some kind on flag to master and when
master wants to communicate with minions that flag changes to something
'Yes' and minions execute "salt-call state.highstate"?

When I run "*salt mysql1.dev.example.net' highstate -l debug"* from master
then sometimes it returns following. It shows no output.

[DEBUG ] get_returns for jid 20140814072556876709 sent to
set(['mysql1.dev.example.net']) will timeout at 07:25:58
[INFO ] jid 20140814072556876709 minions set(['mysql1.dev.example.net'])
did not return in time


How does the salt achieve high-speed with ZeroMQ and as ZeroMQ is used for
high speed. it must have few drawbacks as well?

--Thanks
Pankaj.



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  • Vitold S at Aug 19, 2014 at 9:12 am
    hi,

    it very important question how to interact between salt node.
    we resolve that issue via using event.
    but i really want to make possible maky python handler

    also in debug you may listen bus of salt master and minuon

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  • Sebastien Wains at Aug 19, 2014 at 9:13 am
    I've had the same no output issue. I now run salt with "-t 300", which
    changes the timeout to 300 seconds from 5 by default.

    You can change the default under /etc/salt/master.


    On Monday, August 18, 2014 11:16:01 AM UTC+2, pankaj ghadge wrote:

    Hi All,

    I have few queries related to ZeroMQ and Salt communication.


    - How does the bi-directional communication happens between Master and
    minions?
    - Does Linux system (on minions ) allows bi-directional communication
    with master without opening any port with the help of ZeroMQ? so now I'm
    wondering how it works?

    As it requires to open ports 4505 and 4506 on Master, but not on minions.

    Does the minions continuously sends some kind on flag to master and when
    master wants to communicate with minions that flag changes to something
    'Yes' and minions execute "salt-call state.highstate"?

    When I run "*salt mysql1.dev.example.net
    <http://mysql1.dev.example.net>' highstate -l debug"* from master then
    sometimes it returns following. It shows no output.

    [DEBUG ] get_returns for jid 20140814072556876709 sent to set(['
    mysql1.dev.example.net']) will timeout at 07:25:58
    [INFO ] jid 20140814072556876709 minions set(['mysql1.dev.example.net'])
    did not return in time


    How does the salt achieve high-speed with ZeroMQ and as ZeroMQ is used for
    high speed. it must have few drawbacks as well?

    --Thanks
    Pankaj.


    --
    You received this message because you are subscribed to the Google Groups "Salt-users" group.
    To unsubscribe from this group and stop receiving emails from it, send an email to salt-users+unsubscribe@googlegroups.com.
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  • Pankaj ghadge at Aug 19, 2014 at 12:59 pm
    Thanks for the reply,
    I would change the default value under /etc/salt/master.

    I have also seen that in /etc/salt/minion file one option like
    "tcp_keepalive_idle: 300". 5 min is it's default value. When I checked with
    TCPdump, all minions sending keep alive request after every 5 min. So I
    think when master runs this command "*salt mysql1.dev.example.net
    <http://mysql1.dev.example.net/>' highstate*", then it is responding back
    to request (keep-alive) made by specific/all minions.

    *About ZeroMQ:*

    I have heard that ZeroMQ has higher throughput than TCP even though it's
    built on top of TCP. It may be because of technique known as message
    batching. If I'm correct then how this technique is used in SALT? OR how
    does salt works with zeroMQ?

    Master receives all request (keep-alive) on port 4505 and responds back to
    minions using port 4506,

    I think on port 4505 it en-queue all request came from minions and responds
    back to same request using port 4506.

    They might be checking file checksum on master as well as minions to check
    check any changes occurred, if not then execute the same on minions.

    These are all my assumptions. Please let us know these are correct or
    wrong.

    Best,
    --Pankaj
    On Tuesday, 19 August 2014 14:43:48 UTC+5:30, Sebastien Wains wrote:

    I've had the same no output issue. I now run salt with "-t 300", which
    changes the timeout to 300 seconds from 5 by default.

    You can change the default under /etc/salt/master.


    On Monday, August 18, 2014 11:16:01 AM UTC+2, pankaj ghadge wrote:

    Hi All,

    I have few queries related to ZeroMQ and Salt communication.


    - How does the bi-directional communication happens between Master
    and minions?
    - Does Linux system (on minions ) allows bi-directional communication
    with master without opening any port with the help of ZeroMQ? so now I'm
    wondering how it works?

    As it requires to open ports 4505 and 4506 on Master, but not on minions.

    Does the minions continuously sends some kind on flag to master and when
    master wants to communicate with minions that flag changes to something
    'Yes' and minions execute "salt-call state.highstate"?

    When I run "*salt mysql1.dev.example.net
    <http://mysql1.dev.example.net>' highstate -l debug"* from master then
    sometimes it returns following. It shows no output.

    [DEBUG ] get_returns for jid 20140814072556876709 sent to set(['
    mysql1.dev.example.net']) will timeout at 07:25:58
    [INFO ] jid 20140814072556876709 minions set(['mysql1.dev.example.net'])
    did not return in time


    How does the salt achieve high-speed with ZeroMQ and as ZeroMQ is used
    for high speed. it must have few drawbacks as well?

    --Thanks
    Pankaj.


    --
    You received this message because you are subscribed to the Google Groups "Salt-users" group.
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  • Pankaj ghadge at Aug 25, 2014 at 12:23 pm
    Hi All,

    Does the below diagram is correct for salt topology?

    I'm bit confuse about salt with Zero-MQ, How does the Zero-MQ improves the
    speed?


    <https://lh3.googleusercontent.com/-Nup6xx3eHmI/U_spChEJvzI/AAAAAAAAA40/VvyEAA2Bgh8/s1600/Salt-topology.jpeg>

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