Le 13/02/2015 16:19, Casey Stone a écrit :
> On Feb 5, 2015, at 10:39 PM, Casey Stone <tcst...@caseystone.com> wrote:
>
>> Hello:
>>
>> I've been looking forward to getting my mail server up to Dovecot 2.2+ to be
>> able to use the sync mechanism. I run my own mail server just for myself,
>> with a few different accounts, and want to keep a master and backup server
>> in sync.
>>
>> I'm running the Ubuntu server 14.04.1 mail stack which features Dovecot
>> 2.2.9 (and Postfix). My setup is to use system users (userdb passwd / passdb
>> pam) with ~/Maildir. I'll post full sanitized output of dovecot -n if it
>> seems necessary. I have not enabled any plugins (do I need the replicator
>> plugin active?) I have in my conf a doveadm_password defined.
>>
>> Anyway, after setting up an ssl listener on the main machine and after
>> considerable struggles with SSL, I was able to run doveadm sync from the
>> backup server successfully for a small mailbox (around 78 MB) with this
>> command:
>>
>> doveadm sync -R tcps:mainserver.example.com:12345
>>
>> Since I run this command as the system user on the backup server (same
>> system users as main server) it 'just works' for the correct single user
>> with no further options required. My plan is to run a daily cron job to sync
>> once daily for each user.
>>
>> The problem is when I try to sync a larger mailbox, say 1 GB, dsync-server
>> on the remote (master) machine throws fatal error 83 Out of Memory. I
>> already raised vsz_limit to 512 MB. Problems probably arise with mailboxes
>> around 200 MB though I haven't tested specifically. So my question is, is
>> this expected and I will need to give my VM much more memory to be able to
>> use dovecot sync, or do I have something set wrong, or is it a bug?
>>
>> Thanks for your help.
> No repsonses :-(
>
> Here is what it looks like when it crashes with an out of memory error:
>
> (start of the run)
> Feb 13 14:02:38 thepost dovecot: doveadm(10.0.1.22,tcstone): Debug: Effective
> uid=1002, gid=1002, home=/home/tcstone
> Feb 13 14:02:38 thepost dovecot: doveadm(10.0.1.22,tcstone): Debug: Namespace
> inbox: type=private, prefix=, sep=, inbox=yes, hidden=no, list$
> Feb 13 14:02:38 thepost dovecot: doveadm(10.0.1.22,tcstone): Debug:
> maildir++: root=/data/tcstone/Maildir, index=, indexpvt=, control=, inbo$
> Feb 13 14:02:39 thepost dovecot: dsync-server(tcstone): Debug: Namespace :
> Using permissions from /data/tcstone/Maildir: mode=0700 gid=defau$
> Feb 13 14:02:39 thepost dovecot: dsync-server(tcstone): Debug: brain S: out
> state=send_mailbox_tree changed=1
>
> <<<many, many more brain messages>>>
>
> (end of the run)
> Feb 13 14:02:52 thepost dovecot: dsync-server(tcstone): Fatal:
> pool_system_realloc(536870912): Out of memory
> Feb 13 14:02:52 thepost dovecot: dsync-server(tcstone): Error: Raw backtrace:
> /usr/lib/dovecot/libdovecot.so.0(+0x5e271) [0x7f9d2056b271] ->
> /usr/lib/dovecot/libdovecot.so.0(+0x5e34e) [0x7f9d2056b34e] ->
> /usr/lib/dovecot/libdovecot.so.0(i_error+0) [0x7f9d20526bf8] ->
> /usr/lib/dovecot/libdovecot.so.0(+0x72d53) [0x7f9d2057fd53] ->
> /usr/lib/dovecot/libdovecot.so.0(+0x7792a) [0x7f9d2058492a] ->
> /usr/lib/dovecot/libdovecot.so.0(+0x77be6) [0x7f9d20584be6] ->
> /usr/lib/dovecot/libdovecot.so.0(+0x78748) [0x7f9d20585748] ->
> /usr/lib/dovecot/libdovecot.so.0(o_stream_sendv+0x8d) [0x7f9d20583d7d] ->
> /usr/lib/dovecot/libdovecot.so.0(o_stream_send+0x1a) [0x7f9d20583e1a] ->
> /usr/lib/dovecot/modules/libssl_iostream_openssl.so(+0x4c05) [0x7f9d1f6a0c05]
> ->
> /usr/lib/dovecot/modules/libssl_iostream_openssl.so(openssl_iostream_bio_sync+0x21)
> [0x7f9d1f6a1881] ->
> /usr/lib/dovecot/modules/libssl_iostream_openssl.so(+0x7a4d) [0x7f9d1f6a3a4d]
> -> /usr/lib/dovecot/modules/libssl_iostream_openssl.so(+0x7d69)
> [0x7f9d1f6a3d69] -> /usr/lib/dovecot/libdovecot.so.0(o_stream_sendv+0x8d)
> [0x7f9d20583d7d] -> /usr/lib/dovecot/libdovecot.so.0(o_stream_nsendv+0xf)
> [0x7f9d20583e5f] -> /usr/lib/dovecot/libdovecot.so.0(o_stream_nsend+0x1a)
> [0x7f9d20583e8a] -> dovecot/doveadm-server(+0x2b03f) [0x7f9d20d3003f] ->
> dovecot/doveadm-server(+0x2c768) [0x7f9d20d31768] ->
> dovecot/doveadm-server(dsync_ibc_send_mail+0x29) [0x7f9d20d2f309] ->
> dovecot/doveadm-server(dsync_brain_sync_mails+0x5fc) [0x7f9d20d24a1c] ->
> dovecot/doveadm-server(dsync_brain_run+0x523) [0x7f9d20d20f93] ->
> dovecot/doveadm-server(+0x1c270) [0x7f9d20d21270] ->
> dovecot/doveadm-server(+0x2de60) [0x7f9d20d32e60] ->
> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x27) [0x7f9d2057b247] ->
> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0xd7) [0x7f9d2057bfd7]
> -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f9d2057ade8] ->
> dovecot/doveadm-server(+0x1a189) [0x7f9d20d1f189] ->
> dovecot/doveadm-server(+0xebeb) [0x7f9d20d13beb]
> Feb 13 14:02:52 thepost dovecot: dsync-server(tcstone): Fatal: master:
> service(doveadm): child 13232 returned error 83 (Out of memory (service
> doveadm { vsz_limit=512 MB }, you may need to increase it) - set
> DEBUG_OUTOFMEM=1 environment to get core dump)
>
> I haven't tested whether it is simply the effect of having DEBUG active that
> kills it... A run requiring moving just over 100 MB of mail is enough to
> cause the error. I have tested manually copying the Maildir to the backup
> server, then running the sync or backup command -- this works. Thus is seems
> related not to the size of the mailbox but the size of the data that needs to
> be copied.
To use dsync, use Dovecot 2.2.15 to avoid any trouble.
Use apt.dovecot.fi repository.
Emmanuel.
