[glux] ancora chrony

[gigi-eliotisc]

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dopo le prove fatte giovedi al glux ho installato sulla mia macchina chronyd
ho avuto un piccolo problema con il firewall, dove ho dovuto modificare le impostazioni
per abilitare  il protocollo udp sulla porta 323 che era bloccato
dove non riesco a cavare il ragno dal buco e' sulla impostazione
per le connessioni intermittenti
nelle istruzioni(punto 3.2.2)
dicono di modificare i file /etc/ip-up(e ip-down)
aggiungendo:
     /usr/local/bin/chronyc <<EOF
     password xyzzy
     online
     EOF
io ho una connessione adsl e gli script di connessione sono adsl-start (stop)
e quindi ho aggiunto le righe li.
solo che la cosa non sembra funzionare non capisco perche'
specifico che manualmente da chronyc
la pw viene accettata
i comandi online e offline vengono eseguiti.
allego
chrony.txt = istruzioni
chrony.conf
in chrony.keys c'e' solo la password:
1 xyxxyxy
datemi una dritta!!!!!
ciao
gigi



da istruzioni chrony:


3.2 Infrequent connection to true NTP servers
=============================================

   In this section we discuss how to configure chrony for computers that
have occasional connections to the internet.

3.2.1 Setting up the configuration file for infrequent connections
------------------------------------------------------------------

   As in the previous section, you will need access to NTP servers on
the internet.  The same remarks apply for how to find them.

   In this case, you will need some additional configuration to tell
`chronyd' when the connection to the internet goes up and down.  This
saves the program from continuously trying to poll the servers when
they are inaccessible.

   Again, assuming that your ntp servers are called `a.b.c' and
`d.e.f', your `chrony.conf' file would need to contain something like

     server a.b.c
     server d.e.f
     server g.h.i

   However, the following issues need to be addressed:

  1. Your computer probably doesn't have DNS access whilst offline to
     turn the machine names into IP addresses.

  2. Your computer will keep trying to contact the servers to obtain
     timestamps, even whilst offline.  If you operate a dial-on-demand
     system, things are even worse, because the link to the internet
     will keep getting established.

   For this reason, it would be better to specify this part of your
configuration file in the following way:

     server 1.2.3.4 offline
     server 5.6.7.8 offline
     server 9.10.11.12 offline

   Because numeric IP addresses have been used, the first problem is
overcome.  The `offline' keyword indicates that the servers start in an
offline state, and that they should not be contacted until `chronyd'
receives notification that the link to the internet is present.

   In order to notify `chronyd' of the presence of the link, you will
need to be able to log in to it with the program chronyc.  To do this,
`chronyd' needs to be configured with an administrator password.  To
set up an administrator password, you can create a file
`/etc/chrony.keys' containing a single line

     1 xyzzy

   and add the following line to `/etc/chrony.conf' (the order of the
lines does not matter)

     commandkey 1

   The smallest useful configuration file would look something like

     server 1.2.3.4 offline
     server 5.6.7.8 offline
     server 9.10.11.12 offline
     keyfile /etc/chrony.keys
     commandkey 1
     driftfile /etc/chrony.drift

   The next section describes how to tell `chronyd' when the internet
link goes up and down.

3.2.2 How to tell chronyd when the internet link is available.
--------------------------------------------------------------

   To use this option, you will need to configure a command key in
`chronyd's' configuration file `/etc/chrony.conf', as described in the
previous section.

   To tell `chronyd' when to start and finish sampling the servers, the
`online' and `offline' commands of chronyc need to be used.  To give an
example of their use, we assume that `pppd' is the program being used
to connect to the internet, and that chronyc has been installed at its
default location `/usr/local/bin/chronyc'.  We also assume that the
command key has been set up as described in the previous section.

   In the file `/etc/ppp/ip-up' we add the command sequence

     /usr/local/bin/chronyc <<EOF
     password xyzzy
     online
     EOF

   and in the file `/etc/ppp/ip-down' we add the sequence

     /usr/local/bin/chronyc <<EOF
     password xyzzy
     offline
     EOF

   `chronyd's' polling of the servers will now only occur whilst the
machine is actually connected to the Internet.


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