1. 23 Mar, 2004 3 commits
  2. 20 Mar, 2004 1 commit
    • Mike Hibler's avatar
      Two fubars: · 54046b58
      Mike Hibler authored
      1. make sure we send an immediate isalive on startup rather than waiting
         for the first interval to pass
      2. don't fall back on a tcp call on plab nodes, this just eventually hangs
         all our tmcds on flaky plab machines
      54046b58
  3. 18 Mar, 2004 1 commit
    • Mike Hibler's avatar
      The new watchdog: · 4d037e7c
      Mike Hibler authored
      	- check intervals driven by sitevars delivered by TMCD command
      	- handles rusage stats return on plab nodes
      It is now a single process and executes any auxilliary scripts synchronously.
      This may prove to be unwieldy in the face of long running scripts like
      update.  If so, we'll have to add all that fork/exec/waitpid mucky-muck.
      4d037e7c
  4. 15 Mar, 2004 1 commit
  5. 17 Feb, 2004 1 commit
    • Leigh B. Stoller's avatar
      Medium size cleanup of the client side code. The main impetus behind · 069dc7d3
      Leigh B. Stoller authored
      this was to add soft reconfig support so that nodes could be
      reconfigured without having to reboot them. This appears to work, and
      has been tested with jails getting moved around. I've also tested the
      new code on the MFS, but still no testing has been done on PLAB nodes.
      
      The main change is that most of the code moved out of libsetup.pm, and
      was split into constituent rc scripts, each of which does its own
      thing, including cleaning up and preparing for making an image. Most
      of that central knowledge has been moved out into the scripts. Still more
      to do but this was a good start.
      069dc7d3
  6. 10 Jan, 2004 1 commit
  7. 26 Dec, 2003 1 commit
  8. 09 Oct, 2003 1 commit
    • Leigh B. Stoller's avatar
      Reorg of two aspects of node update. · 2641af4d
      Leigh B. Stoller authored
      * install-rpm, install-tarfile, spewrpmtar.php3, spewrpmtar.in: Pumped
        up even more! The db file we store in /var/db now records both the
        timestamp (of the file, or if remote the install time) and the MD5
        of the file that was installed. Locally, we can get this info when
        accessing the file via NFS (copymode on or off). Remote, we use wget
        to get the file, and so pass the timestamp along in the URL request,
        and let spewrpmtar.in determine if the file has changed. If the
        timestamp it gets is >= to the timestamp of the file, an error code
        of 304 (Not Modifed) is returned. Otherwise the file is returned.
      
        If the timestamps are different (remote, server sends back an actual
        file), the MD5 of the file is compared against the value stored. If
        they are equal, update the timestamp in the db file to avoid
        repeated MD5s (or server downloads) in the future. If the MD5 is
        different, then reinstall the tarball or rpm, and update the db file
        with the new t...
      2641af4d
  9. 06 Oct, 2003 1 commit
    • Leigh B. Stoller's avatar
      * New libtmcc.pm module that encapsulates the tmcc interface. Most of the · 434a472a
      Leigh B. Stoller authored
        code that was in libsetup has moved into this library, and underwent a
        giant cleaning and pumping up. The interface from your typical perl
        script now looks like this:
      
        use libtmcc;
      
        if (tmcc(TMCCCMD_STATUS, "optional arguments", \@tmccresults) < 0) {
            warn("*** WARNING: Could not get status from server!\n");
            return -1;
        }
        foreach my $me (@tmccresults) {
      	print "bite $me";
        }
      
        The arguments and results are optional values. There is a fourth optional
        value that is a hash of config options (basically converted to command
        line switches passed to tmcc). For example, to set the timeout on an
        individual call, pass a fourth argument like:
      
      	("timeout" => 5)
      
        There is also a way to set global options so that all subsequent tmcc
        calls are affected:
      
      	configtmcc("timeout", 5);
      
        I'll probably clean this up a bit to avoid the direct strings.
      
        The result list is a list of strings. Since we are trending away from
        using tmcc to transfer large amounts of data, I think this is okay.
      
      * A new tmcc.pl which does little more than load libtmcc and use it.
        This will become the new tmcc, with the existing C version becoming a
        backend binary for it.
      
      * All of the perl scripts in tmcd have been changed to use the new
        library. I left the few uses of tmcc in shell scripts alone since they
        were of the simple variety (mostly "state" command).
      
      * And again, if you have read this far, you will learn why I bothered with
        all this. Well, the existing code was really bad and it was getting out
        of control. Sort of like a squid that was getting harder to control as
        its rotting tenticles slithered into more and more scripts. Anyway ...
      
        More important, my goal is to use the libtmcc library to add caching.  I
        have not worked out the details yet, but I am envisioning a configuration
        file, perhaps generated initially by tmcd, of all of the config
        values. If the library finds that file, it sucks the info out of the file
        instead of going to tmcd. Eventually, this config file would be generated
        as part of experiment swapping and stored in the DB, but thats a longer
        term project, and perhaps orthogonal (how we fill the cache is not as
        important as adding the ability to use a cache, right?).
      
        Note that certain operations (like "state" and "ready") are flagged by
        the library to always bypass the "cache".
      434a472a
  10. 03 Sep, 2003 1 commit
  11. 18 Aug, 2003 1 commit
  12. 05 Aug, 2003 1 commit
    • Leigh B. Stoller's avatar
      The rest of the sync server additions: · 212cc781
      Leigh B. Stoller authored
      * Parser: Added new tb command to set the name of the sync server:
      
      	tb-set-sync-server <node>
      
        This initializes the sync_server slot of the experiment entry to the
        *vname* of the node that should run the sync server for that
        experiment. In other words, the sync server is per-experiment, runs
        on a node in the experiment, and the user gets to chose which node
        it runs on.
      
      * tmcd and client side setup. Added new syncserver command which
        returns the name of the syncserver and whether the requesting node
        is the lucky one to run the daemon:
      
          SYNCSERVER SERVER='nodeG.syncserver.testbed.emulab.net' ISSERVER=1
      
        The name of the syncserver is written to /var/emulab/boot/syncserver
        on the nodes so that clients can easily figure out where the server
        is.
      
        Aside: The ready bits are now ignored (no DB accesses are made) for
        virtual nodes; they are forced to use the new sync server.
      
      * New os/syncd directory containing the daemon and the client. The
        daemon is pretty simple. It waits for TCP (and UDP, although that
        path is not complete yet) connections, and reads in a little
        structure that gives the name of the "barrier" to wait for, and an
        optional count of clients in the group (this would be used by the
        "master" who initializes barriers for clients). The socket is saved
        (no reply is made, so the client is blocked) until the count reaches
        zero. Then all clients are released by writting back to the
        sockets, and the sockets are closed. Obviously, the number of
        clients is limited by the numbed of FDs (open sockets), hence the
        need for a UDP variant, but that will take more work.
      
        The client has a simple command line interface:
      
          usage: emulab-sync [options]
          -n <name>         Optional barrier name; must be less than 64 bytes long
          -d                Turn on debugging
          -s server         Specify a sync server to connect to
          -p portnum        Specify a port number to connect to
          -i count          Initialize named barrier to count waiters
          -u                Use UDP instead of TCP
      
          The client figures out the server by looking for the file created
          above by libsetup (/var/emulab/boot/syncserver). If you do not
          specify a barrier "name", it uses an internal default. Yes, the
          server can handle multiple barriers (differently named of course)
          at once (non-overlapping clients obviously).
      
          Clients can wait before a barrier in "initialized." The count on
          the barrier just goes negative until someone initializes the
          barrier using the -i option, which increments the count by the
          count. Therefore, the master does not have to arrange to get there
          "first." As an example, consider a master and one client:
      
      	nodeA> /usr/local/etc/emulab/emulab-sync -n mybarrier
      	nodeB> /usr/local/etc/emulab/emulab-sync -n mybarrier -i 1
      
          Node A waits until Node B initializes the barrier (gives it a
          count).  The count is the number of *waiters*, not including the
          master. The master is also blocked until all of the waiters have
          checked in.
      
          I have not made an provision for timeouts or crashed clients. Lets
          see how it goes.
      212cc781
  13. 05 Jun, 2003 1 commit
  14. 30 Jan, 2003 1 commit
  15. 06 Jan, 2003 1 commit
  16. 18 Dec, 2002 2 commits
    • Leigh B. Stoller's avatar
      Add new watchdog script, derived from the ron version (and will · 482fb815
      Leigh B. Stoller authored
      replace it eventually). Like the ron nodes, local nodes will now
      periodically (once every 5 minutes) send a udp packet to boss to
      indicate the node is alive and to see if it needs to check for account
      updates. This will replace the once every 5 minute fping we do from
      db/node_status (once I whack that script), and will simplify the
      existing problem of propogating accounts to nodes (nodes down, nodes
      in the swapping phase, etc).
      482fb815
    • Leigh B. Stoller's avatar
      group,master.password: Add sshd, smmsp, mailnull, and sfs. · 77661f58
      Leigh B. Stoller authored
      rc.conf: Remove fixed -p argument. Now set by mkjail.
      rc.local,jailctl: Update for client side path reorg and cleanup.
      jaildog.pl,mkjail.pl: Numerous fixes for jailed nodes.
      77661f58
  17. 26 Sep, 2002 1 commit
  18. 27 Aug, 2002 1 commit
  19. 15 Aug, 2002 1 commit
  20. 29 Jul, 2002 1 commit
    • Leigh B. Stoller's avatar
      A wide array of little changes to improve the distribution of the · f066d2d9
      Leigh B. Stoller authored
      client software to widearea nodes. Most of these changes were to
      reduce the embarrassment factor. At some point we need a proper
      autoconf and such, but for now there is a makefile in the src dir for
      creating the distribution.
      
      I've tested it on a local linux node and mostly on a freebsd node, but
      I've moved things around and so updating the RON nodes will require
      some hand intervention by me at some point.
      f066d2d9
  21. 10 Jul, 2002 1 commit
  22. 07 Jul, 2002 1 commit
  23. 02 Jul, 2002 2 commits
  24. 19 Jun, 2002 1 commit
    • Leigh B. Stoller's avatar
      Add a 60 second timer to tell Emulab that the node is alive and · 6b75cf38
      Leigh B. Stoller authored
      well. We use a UDP packet to keep it lightweight. If it does not get
      through, thats okay, obviously. The return value is just a yes/no flag
      that says an update needs to run. Right now, thats just accounts.
      This allows us to churn a little less on accounts.
      Other cleanups.
      6b75cf38
  25. 06 Jun, 2002 1 commit
  26. 31 May, 2002 1 commit
    • Leigh B. Stoller's avatar
      New watchdog daemon for remote (RON) nodes. Okay, not much of a · 6c44b4a4
      Leigh B. Stoller authored
      watchdog at the moment, but it will be. Right now it does boot time
      stuff; issues tmcc state event so the testbed knows (REBOOTED), does
      an account update to get any accounts missed while dead, then sets up
      and vnodes (tunnels and such) that where supposed to be running on
      the node, then issues a tmcc ISUP event.
      
      After that, goes into a loop doing periodic account update. At some
      point it would be good to look for stale vnodes (that could not be
      torn down because of network connectivity problems), but there are
      some race conditions that I need to work out first.
      6c44b4a4