doveadm backup only working once?

4 Jan 2021


      All,
For the past 2 weeks I have been trying to get dovecot mail backup
working between 2 debian 10 machines.
Both machines are running the same OS (Debian 10) and configuration wise
they are similar (except of course ip addresses, hostnames etc).
My "main" machine is called "server" and the 2nd machine is "server2".
See below for the dovecot -n output on server2.
I created a testuser called synctest on both server1 and server2 and
have sent a couple (2) email messages to synctest@server.
Those testmessages are now present in /var/mail/synctest mbox file on
server1.
When trying to create a backup from server->server2 for user synctest I
use this command:
#doveadm -D -v backup -R -f -u synctest tcp:192.168.3.1:12345
(using something similar from server1 -> server2 like this: #doveadm -D
-v backup -f -u synctest tcp:192.168.3.2:12345 has the same results btw)
The first attempte appears to be working OK but the the 2nd attempt
(nothing was changed on server1 before the 2nd attempt) fails with
soemthing like: Error: Couldn't delete mailbox INBOX: Permission denied
Before I can get a succesfull backup again I need to do this (on server2):
#rm /var/mail/synctest
#rm -r ~syncuser/mail/index/INBOX
#doveadm mailbox delete -u synctest INBOX
(if I don't do the rm /var/mail/synctest before the doveadm mailbox
delete command I will also get a:
Error: Can't delete mailbox INBOX: Permission denied
Anybody any idea what is happening here? Should I enable replicator
and/or aggregator?
Output of 1st and 2nd dovadm backup attempt is below:
root@server2:/home/synctest/mail# doveadm -D -v backup -R -f -u synctest
tcp:192.168.3.1:12345
Debug: Loading modules from directory: /usr/lib/dovecot/modules/doveadm
Debug: Skipping module doveadm_acl_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_acl_plugin.so: undefined
symbol: acl_user_module (this is usually intentional, so just ignore
this message)
Debug: Skipping module doveadm_expire_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_expire_plugin.so:
undefined symbol: expire_set_deinit (this is usually intentional, so
just ignore this message)
Debug: Skipping module doveadm_quota_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_quota_plugin.so:
undefined symbol: quota_user_module (this is usually intentional, so
just ignore this message)
Debug: Module loaded:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_sieve_plugin.so
Debug: Skipping module doveadm_fts_lucene_plugin, because dlopen()
failed:
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_lucene_plugin.so:
undefined symbol: lucene_index_iter_deinit (this is usually intentional,
so just ignore this message)
Debug: Skipping module doveadm_fts_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_plugin.so: undefined
symbol: fts_user_get_language_list (this is usually intentional, so just
ignore this message)
Debug: Skipping module doveadm_mail_crypt_plugin, because dlopen()
failed:
/usr/lib/dovecot/modules/doveadm/libdoveadm_mail_crypt_plugin.so:
undefined symbol: mail_crypt_box_get_pvt_digests (this is usually
intentional, so just ignore this message)
doveadm(synctest)<13039><>: Debug: auth USER input: synctest
system_groups_user=synctest uid=1006 gid=100 home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): auth USER input:
synctest system_groups_user=synctest uid=1006 gid=100 home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): Effective uid=1006,
gid=100, home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): Namespace inbox:
type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes,
subscriptions=yes
location=mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: remote(192.168.3.1:12345): fs:
root=/home/synctest/mail/mailboxes, index=/home/synctest/mail/index,
indexpvt=, control=/home/synctest/mail/control,
inbox=/var/mail/synctest, alt=
doveadm(synctest): Debug: Effective uid=1006, gid=100, home=/home/synctest
doveadm(synctest): Debug: Namespace inbox: type=private, prefix=, sep=,
inbox=yes, hidden=no, list=yes, subscriptions=yes
location=mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: fs: root=/home/synctest/mail/mailboxes,
index=/home/synctest/mail/index, indexpvt=,
control=/home/synctest/mail/control, inbox=/var/mail/synctest, alt=
doveadm(synctest): Debug: brain M: Namespace  has location
mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: Namespace : Using permissions from
/home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest): Debug: brain M: Remote
mailbox tree: INBOX guid=f8ecea204a65f05fea460000b4581695
uid_validity=1609590090 uid_next=9 subs=no last_change=0 last_subs=0
dsync-local(synctest): Debug: brain M: Mailbox
INBOX: local=00000000000000000000000000000000/0/0,
remote=f8ecea204a65f05fea460000b4581695/0/1: mailbox not selectable yet
dsync-local(synctest): Debug: Namespace :
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default
permissions
dsync-local(synctest): Debug: Namespace : Using
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest): Debug: Namespace :
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default
permissions
dsync-local(synctest): Debug: Namespace : Using
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest): Debug: Namespace :
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default
permissions
dsync-local(synctest): Debug: Namespace : Using
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest): Debug: Namespace :
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default
permissions
dsync-local(synctest): Debug: Namespace : Using
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest): Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=1 hdr_hash=
result=Expunged mail not found locally
dsync-local(synctest): Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=2 hdr_hash=
result=Expunged mail not found locally
dsync-local(synctest): Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=3 hdr_hash=
result=Expunged mail not found locally
dsync-local(synctest): Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=4 hdr_hash=
result=Expunged mail not found locally
dsync-local(synctest): Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=5 hdr_hash=
result=Expunged mail not found locally
dsync-local(synctest): Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=6 hdr_hash=
result=Expunged mail not found locally
dsync-local(synctest): Debug: brain M: Import
INBOX: Last common UID=0. Delayed expunges=
dsync-local(synctest): Debug: brain M: Import
INBOX: Import change type=save GUID=8bce3bc615e7f2a1dfad970a3cd36bdb
UID=7 hdr_hash= result=Mail's UID is above local UIDNEXT - No more local
mails found
dsync-local(synctest): Debug: brain M: Import
INBOX: Import change type=save GUID=c9cdf5f725d4195db78b20bbacad189b
UID=8 hdr_hash= result=New mail
dsync-local(synctest): Debug: brain M: import
mail uid 0 guid 8bce3bc615e7f2a1dfad970a3cd36bdb
dsync-local(synctest): Debug: brain M: Import
INBOX: Import mail body for GUID=8bce3bc615e7f2a1dfad970a3cd36bdb UID=0
dsync-local(synctest): Debug:
/home/synctest/mail/index/INBOX/dovecot.index.cache: Compressed,
file_seq changed 0 -> 1609779677, size=32, max_uid=0
dsync-local(synctest): Debug: brain M: import
mail uid 0 guid c9cdf5f725d4195db78b20bbacad189b
dsync-local(synctest): Debug: brain M: Import
INBOX: Import mail body for GUID=c9cdf5f725d4195db78b20bbacad189b UID=0
dsync-local(synctest): Debug: brain M: Import
INBOX: Saved UIDs: 7:8
dsync-local(synctest): Debug: brain M: Import
INBOX: Finish update: min_next_uid=9 min_first_recent_uid=1
min_highest_modseq=10 min_highest_pvt_modseq=0
dsync-local(synctest): Debug: brain M: Import
INBOX: Reassign UIDs: 1:
This appears to work perfectly well the first time (maybe I am
overlooking some issue already at this stage?) At least after the backup
has been completed /var/mail/syncuser on server2 contains all the
messages that are also present on server1. And the
~syncuser/mail/index/INBOX folder also exists (don't know why this is
created btw?)
But then when running the same command for the 2nd time (and no changes
on the /var/mail/synctest file on server1) the command failes like this
(permission denied to delete INBOX at the end):
root@server2:/home/synctest/mail# doveadm -D -v backup -R -f -u synctest
tcp:192.168.3.1:12345
Debug: Loading modules from directory: /usr/lib/dovecot/modules/doveadm
Debug: Skipping module doveadm_acl_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_acl_plugin.so: undefined
symbol: acl_user_module (this is usually intentional, so just ignore
this message)
Debug: Skipping module doveadm_expire_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_expire_plugin.so:
undefined symbol: expire_set_deinit (this is usually intentional, so
just ignore this message)
Debug: Skipping module doveadm_quota_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_quota_plugin.so:
undefined symbol: quota_user_module (this is usually intentional, so
just ignore this message)
Debug: Module loaded:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_sieve_plugin.so
Debug: Skipping module doveadm_fts_lucene_plugin, because dlopen()
failed:
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_lucene_plugin.so:
undefined symbol: lucene_index_iter_deinit (this is usually intentional,
so just ignore this message)
Debug: Skipping module doveadm_fts_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_plugin.so: undefined
symbol: fts_user_get_language_list (this is usually intentional, so just
ignore this message)
Debug: Skipping module doveadm_mail_crypt_plugin, because dlopen()
failed:
/usr/lib/dovecot/modules/doveadm/libdoveadm_mail_crypt_plugin.so:
undefined symbol: mail_crypt_box_get_pvt_digests (this is usually
intentional, so just ignore this message)
doveadm(synctest)<13056><>: Debug: auth USER input: synctest
system_groups_user=synctest uid=1006 gid=100 home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): auth USER input:
synctest system_groups_user=synctest uid=1006 gid=100 home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): Effective uid=1006,
gid=100, home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): Namespace inbox:
type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes,
subscriptions=yes
location=mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: remote(192.168.3.1:12345): fs:
root=/home/synctest/mail/mailboxes, index=/home/synctest/mail/index,
indexpvt=, control=/home/synctest/mail/control,
inbox=/var/mail/synctest, alt=
doveadm(synctest): Debug: Effective uid=1006, gid=100, home=/home/synctest
doveadm(synctest): Debug: Namespace inbox: type=private, prefix=, sep=,
inbox=yes, hidden=no, list=yes, subscriptions=yes
location=mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: fs: root=/home/synctest/mail/mailboxes,
index=/home/synctest/mail/index, indexpvt=,
control=/home/synctest/mail/control, inbox=/var/mail/synctest, alt=
doveadm(synctest): Debug: brain M: Namespace  has location
mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: Namespace :
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default
permissions
doveadm(synctest): Debug: Namespace : Using permissions from
/home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Local
mailbox tree: INBOX guid=f8ecea204a65f05fea460000b4581695
uid_validity=1609590090 uid_next=9 subs=no last_change=0 last_subs=0
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Remote
mailbox tree: INBOX guid=f8ecea204a65f05fea460000b4581695
uid_validity=1609590090 uid_next=9 subs=no last_change=0 last_subs=0
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Mailbox
INBOX: local=f8ecea204a65f05fea460000b4581695/0/1,
remote=f8ecea204a65f05fea460000b4581695/0/1: Mailboxes are equal
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: Namespace :
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default
permissions
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: Namespace : Using
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=1 hdr_hash=
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=2 hdr_hash=
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=3 hdr_hash=
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=4 hdr_hash=
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=5 hdr_hash=
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import
INBOX: Import change type=expunge GUID=<unknown> UID=6 hdr_hash=
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Warning: Deleting mailbox
'INBOX': UID=7 already exists locally for a different mail: Headers
hashes don't match (9fc2f2229a1a2a8d5f12304cb5287f97 vs
b62e0281b4f375a45040c552b55ab31a)
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import
INBOX: Import change type=save GUID=8bce3bc615e7f2a1dfad970a3cd36bdb
UID=7 hdr_hash=9fc2f2229a1a2a8d5f12304cb5287f97 result=Headers hashes
don't match (9fc2f2229a1a2a8d5f12304cb5287f97 vs
b62e0281b4f375a45040c552b55ab31a)
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import
INBOX: Saved UIDs:
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: doveadm-sieve:
Iterating Sieve mailbox attributes
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: Pigeonhole
version 0.5.4 () initializing
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: include:
sieve_global is not set; it is currently not possible to include
`:global' scripts.
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file
storage: Using active Sieve script path: /home/synctest/.dovecot.sieve
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file
storage: Using script storage path: /home/synctest/sieve
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file
storage: Using permissions from /home/synctest/sieve: mode=0700 gid=-1
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file
storage: Relative path to sieve storage in active link: sieve/
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file
storage: sync: Synchronization active
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Error: Couldn't delete
mailbox INBOX: Permission denied
root@server2:/home/synctest/mail# dovecot -n
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 ()
# OS: Linux 4.19.0-12-amd64 x86_64 Debian 10.6
# Hostname: server2.fritz.box
auth_username_format = %Ln
doveadm_password = # hidden, use -P to show it
lda_mailbox_autocreate = yes
login_trusted_networks = 192.168.3.0/24
mail_location =
mbox:~/mail/mailboxes:INBOX=/var/mail/%u:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
mail_privileged_group = mail
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope
encoded-character vacation subaddress comparator-i;ascii-numeric
relational regex imap4flags copy include variables body enotify
environment mailbox date index ihave duplicate mime foreverypart extracttext
namespace inbox {
inbox = yes
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix =
}
passdb {
driver = pam
}
plugin {
sieve = ~/.dovecot.sieve
sieve_default = /var/lib/dovecot/sieve/default.sieve
sieve_dir = ~/sieve
}
postmaster_address = postmaster@"domain"
protocols = imap pop3 lmtp
service doveadm {
inet_listener {
port = 12345
}
}
service managesieve-login {
inet_listener sieve {
port = 4190
}
}
ssl_cert =

Engelbert Torremans

Engelbert Torremans

Christian Kivalo

Aki Tuomi

Engelbert Torremans

Odhiambo Washington

Aki Tuomi

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