On Tue, 2010-07-20 at 14:30 -0400, James Antill wrote: > On Tue, 2010-07-20 at 14:01 -0400, JohnS wrote: > > The exact problem is yum can't get a lock on the meta data db in an nfs > > root. I have browsed the yum list and seen the same problems and no fix > > for it yet or really mention of even if it could be fixed. > > Define "locking". > > Atm. yum does: > > 1. When generating the repodata sqlite DBs sqlite will automatically > lock those. This is _per_ DB though, so does not really do anything > useful for yum. This also requires the repodata only ships .xml data, > which isn't best practice. > > 2. When reading the repodata sqlite DBs I _think_ sqlite takes read-only > locks on the DB ... against this doesn't really help us, and if we > haven't turned it off already it's very plausible that we will.
Should only need row locking? Instead of the whole DB. > 3. When reading/writing the history DB we have sqlite locking there. > This should protect the sqlite DB, but doesn't do much for yum itself > (esp. downloading/updating repodata and packages). Sounds right to me for the that db. I come from an environment where we lock the whole History/Logging Db with the inserting table unlocked and there are no updates on the db only new inserts > 4. When we are running _as root_, we create /var/run/yum.pid as a "lock > file". This is an old style "dot locking" mechanism though (but using > the actual filename). This serializes all root yum instances on a single > machine. > > ...we have plans to change #4 so that it'll work with normal users as > well as root (ie. use a file based on cachedir). That's what I need to have a common NFS builder root for multi machine access on need. > This will _help_ your situation of running as root from multiple > machines, assuming we move the lock file for root too, as each machine > will be able to see the lock file if you just share /var/cache/yum. I > doubt we'll be guaranteeing it works though, just as we don't now (lots > of work from other people may persuade us :). To be exact I want to NFS /var/Plague and that is not possible atm where I have the rest of it NFSed. > In general for people who want this, I always recommend you read: > > http://yum.baseurl.org/wiki/YumMultipleMachineCaching Read the above link and thanks for it. Is there any kind a pre release code for whats in working progress that will build under RHEL 5/CentOS 5 or patches to the current yum version in them? John _______________________________________________ Yum-devel mailing list Yum-devel@lists.baseurl.org http://lists.baseurl.org/mailman/listinfo/yum-devel
