<pgAdmin 4 - DB:postgres>]>:idleLOG: could not receive data from client: Connection reset by peer
Trying to take backup and getting error after 100 or 200 GB backup .Idle backup size is 400 GB and I'm taking backup on same server.I'm using posttgres 12. I'm taking backup of 700GB database.
I am trying to backup using barman command: barman backup pg but it shown error like
ERROR: Impossible to start the backup. Check the log for more details, or run 'barman check pg'
Later I checked using barman command: barman check pg I found another error
systemid coherence: FAILED . Next I check systemid of postgres at barman, I found systemdid is different.
What need to do in this case?
I removed identity.json file form barman. Though somehow it solved my issue. But I am not sure whether it is right way or not, to solve this issue?
What is the actual use of identity.json? i am looking for expert opinion.
Server pg:
PostgreSQL: OK
superuser or standard user with backup privileges: OK
PostgreSQL streaming: OK
wal_level: OK
replication slot: OK
directories: OK
retention policy settings: OK
backup maximum age: OK (interval provided: 1 day, latest backup age: 2 hours, 57 minutes, 55 seconds)
backup minimum size: OK (876.1 MiB)
wal maximum age: OK (no last_wal_maximum_age provided)
wal size: OK (31.5 KiB)
compression settings: OK
failed backups: OK (there are 0 failed backups)
minimum redundancy requirements: OK (have 3 backups, expected at least 1)
ssh: OK (PostgreSQL server)
systemid coherence: FAILED (the system Id of the connected PostgreSQL server changed, stored in "/var/lib/barman/pg/identity.json")
pg_receivexlog: OK
pg_receivexlog compatible: OK
receive-wal running: OK
archive_mode: OK
archive_command: OK
continuous archiving: OK
archiver errors: FAILED (duplicates: 50)
Trying to setup wal-e for postgres.
Following various tutorials and I'm at a point to finally do a first backup of a clean 9.6 postgres install.
Followed some tutorials and finally read to do an initial wal-e backup-push, as follows:
sudo -u postgres -i
envdir /etc/wal-e.d/env wal-e backup-push /var/lib/postgresql/9.6/main
I'd expect the command to terminate rather quickly, since it's an empty database.
However it seems to wait indefinitely. Showing waiting for required WAL segments to be archived
postgres#postgres:~$ envdir /etc/wal-e.d/env wal-e backup-push /var/lib/postgresql/9.6/main
wal_e.main INFO MSG: starting WAL-E
DETAIL: The subcommand is "backup-push".
STRUCTURED: time=2017-05-26T11:45:52.138889-00 pid=10426
wal_e.operator.backup INFO MSG: start upload postgres version metadata
DETAIL: Uploading to s3://xxxxxx/basebackups_005/base_000000010000000000000060_00000040/extended_version.txt.
STRUCTURED: time=2017-05-26T11:45:52.719220-00 pid=10426
wal_e.operator.backup INFO MSG: postgres version metadata upload complete
STRUCTURED: time=2017-05-26T11:45:52.929696-00 pid=10426
wal_e.worker.upload INFO MSG: beginning volume compression
DETAIL: Building volume 0.
STRUCTURED: time=2017-05-26T11:45:53.075771-00 pid=10426
wal_e.worker.upload INFO MSG: begin uploading a base backup volume
DETAIL: Uploading to "s3://xxxxxx/basebackups_005/base_000000010000000000000060_00000040/tar_partitions/part_00000000.tar.lzo".
STRUCTURED: time=2017-05-26T11:45:53.752390-00 pid=10426
wal_e.worker.upload INFO MSG: finish uploading a base backup volume
DETAIL: Uploading to "s3://xxxxxx/basebackups_005/base_000000010000000000000060_00000040/tar_partitions/part_00000000.tar.lzo" complete at 9106.47KiB/s.
STRUCTURED: time=2017-05-26T11:45:54.327037-00 pid=10426
NOTICE: pg_stop_backup cleanup done, waiting for required WAL segments to be archived
WARNING: pg_stop_backup still waiting for all required WAL segments to be archived (60 seconds elapsed)
HINT: Check that your archive_command is executing properly. pg_stop_backup can be canceled safely, but the database backup will not be usable without all the WAL segments.
WARNING: pg_stop_backup still waiting for all required WAL segments to be archived (120 seconds elapsed)
HINT: Check that your archive_command is executing properly. pg_stop_backup can be canceled safely, but the database backup will not be usable without all the WAL segments.
To be honest I'm a bit out of my depth here. Afaik, the above should do an initial backup, but not wait for WAL-files which are obviously continuously updated. (I've got archive_mode=on in my postgres config and set archive_command = 'envdir /etc/wal-e.d/env wal-e wal-push %p' which should do the incremental pushes. Again afaik.).
How can I get this initial backup command to finish?
I am trying to configure Barman to backup. When I do a barman check replica I keep getting:
Server replica:
WAL archive: FAILED (please make sure WAL shipping is setup)
PostgreSQL: OK
superuser: OK
wal_level: OK
directories: OK
retention policy settings: OK
backup maximum age: FAILED (interval provided: 1 day, latest backup age: No available backups)
compression settings: OK
failed backups: OK (there are 0 failed backups)
minimum redundancy requirements: FAILED (have 0 backups, expected at least 2)
ssh: OK (PostgreSQL server)
not in recovery: FAILED (cannot perform exclusive backup on a standby)
archive_mode: OK
archive_command: OK
continuous archiving: OK
archiver errors: OK
I am using Postgresql 9.6 and barman 2.1; I am not sure as to what the issue is could someone help?
Here is my Barman server configuration:
description = "Database backup"
conninfo = host=<db-ip> user=postgres dbname=db
backup_method = rsync
ssh_command = ssh postgres#<db-ip>
archiver = on
barman check tries to confirm that archiving is set up correctly by asserting that there's actually something in the archive. However, WAL segments are generally only archived once they're filled up, and if your server is idle, this is never going to happen.
To work around this, Barman provides a command to force a segment switch, wait for the completed WAL to show up, and then archive it immediately:
barman switch-xlog --force --archive replica
in brief
Barman's incoming_wals_directory and Postgresql.conf's archive_command not matched as described in details here
details
Another cause is that the not matched between
Barman's incoming_wals_directory
Postgresql.conf's archive_command
Bash util to check
barman#backup $ barman show-server pg | grep incoming_wals_directory
# output1
# > incoming_wals_directory: /var/lib/barman/pg/incoming
postgres#pg $ cat /etc/postgresql/10/main/postgresql.conf | grep archive_command
# output2
# > archive_command = 'rsync -a %p barman#staging:/var/lib/barman/pg/incoming/%f'
We must have same path in :output1 and :output2
Make them matched if they don't and don't forget to restart postgres afterward.
I have a PostgreSQL 9.1.3 streaming replication setup on Ubuntu 10.04.2 LTS (primary and standby). Replication is initialized with a streamed base backup (pg_basebackup). The restore_command script tries to fetch the required WAL archives from a remote archive location with rsync.
Everything works like described in the documentation when the restore_command script fails with an exit code <> 255:
At startup, the standby begins by restoring all WAL available in the archive location, calling restore_command. Once it reaches the end of WAL available there and restore_command fails, it tries to restore any WAL available in the pg_xlog directory. If that fails, and streaming replication has been configured, the standby tries to connect to the primary server and start streaming WAL from the last valid record found in archive or pg_xlog. If that fails or streaming replication is not configured, or if the connection is later disconnected, the standby goes back to step 1 and tries to restore the file from the archive again. This loop of retries from the archive, pg_xlog, and via streaming replication goes on until the server is stopped or failover is triggered by a trigger file.
But when the restore_command script fails with exit code 255 (because the exit code from a failed rsync call is returned by the script) the server process dies with the following error:
2012-05-09 23:21:30 CEST - # LOG: database system was interrupted; last known up at 2012-05-09 23:21:25 CEST
2012-05-09 23:21:30 CEST - # LOG: entering standby mode
rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]
rsync error: unexplained error (code 255) at io.c(601) [Receiver=3.0.7]
2012-05-09 23:21:30 CEST - # FATAL: could not restore file "00000001000000000000003D" from archive: return code 65280
2012-05-09 23:21:30 CEST - # LOG: startup process (PID 8184) exited with exit code 1
2012-05-09 23:21:30 CEST - # LOG: aborting startup due to startup process failure
So my question is now: Is this a bug or is there a special meaning of exit code 255 which is missing in the otherwise excellent documentation or am I missing something else here?
On the primary server, you have WAL files sitting in the pg_xlog/ directory. While WAL files are there, PostgreSQL is able to deliver them to the standby should they be requested.
Typically, you also have local archived WAL location, when files are moved there by PostgreSQL, they no longer can be delivered to the standby on-line and standby is expecting them to come from the archived WAL location via restore_command.
If you have different locations for archived WALs setup on primary and on standby servers, then there's no way for a while to reach standby and you have a gap.
In your case this might mean, that:
00000001000000000000003D had been archived by the primary PostgreSQL;
standby's restore_command doesn't see it from the configured source location.
You might consider manually copying missing WAL files from primary to the standby using scp or rsync. It is also might be necessary to review your WAL locations and make sure both servers look in the same direction.
EDIT:
grep-ing for restore_command in sources, only access/transam/xlog.c references it. In function RestoreArchivedFile almost at the end (round line 3115 for 9.1.3 sources), there's a check whether restore_command had exited normally or had it received a signal.
In first case, message is classified as DEBUG2. In case restore_command received a signal other then SIGTERM (and wasn't able to handle it properly I guess), a FATAL error will be reported. This is true for all codes greater then 125.
I will not be able to tell you why though.
I recommend asking on the hackers list.
This looks like an rsync problem I encountered temporarily using NFS (with rpcbind/rstatd on port 837):
$ rsync -avz /var/backup/* backup#storage:/data/backups
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(600) [sender=3.0.6]
This fixed it for me:
service rpcbind stop
I had the same issue creating a hot standby (postgres 9.5). Streaming was working (I seeded the standby via pg_basebackup using the same credentials as would later be used in the standby's recovery.conf).
After taking the basebackup, I setup the following recovery.conf:
standby_mode = 'on'
primary_conninfo = 'host=ip.of.master port=5432 user=pgstandby password=password'
recovery_target_timeline = 'latest'
restore_command = 'sftp -q user#ip.of.wal.archive.host:data/master_wal_archive/%f "%p"'
trigger_file = '/srv/pgsql/9.5/data/trigger'
Starting the server would yield:
2016-03-08 12:34:58.981 UTC (/)LOG: database system was interrupted; last known up at 2016-03-08 12:26:10 UTC
Couldn't read packet: Connection reset by peer
2016-03-08 12:34:59.525 UTC (/)FATAL: could not restore file "00000002.history" from archive: child process exited with exit code 255
2016-03-08 12:34:59.526 UTC (/)LOG: startup process (PID 26636) exited with exit code 1
2016-03-08 12:34:59.526 UTC (/)LOG: aborting startup due to startup process failure
If I removed the restore_command line from recovey.conf, the standby started up fine and began streaming WALs from the master.
I eventually traced the problem down to not having added the standby postgres user's public key to the authorized_hosts file of the WAL archive host. I'd also forgotten to add the WAL archive host's server fingerprint to the known_hosts file of the standby postgres user.
These two mistakes were (I assume) causing the sftp restore_command to exit with code 255. As tscho says, the Postgres docs suggest that if the restore_command exits with ANY non-zero value, Postgres will simply move on to trying to stream from the master rather than refusing to start. In reality this doesn't seem to be the case if the exit code is higher than a certain number (maybe 125, as vyegorov's source code grepping suggests?).
Once I fixed the two SSH issues, the standby started fine with the restore_command present in recovery.conf.
Here is the comment describing why this behavior for high exit status from the command process was chosen, and the current code to implement it.
/*
* Remember, we rollforward UNTIL the restore fails so failure here is
* just part of the process... that makes it difficult to determine
* whether the restore failed because there isn't an archive to restore,
* or because the administrator has specified the restore program
* incorrectly. We have to assume the former.
*
* However, if the failure was due to any sort of signal, it's best to
* punt and abort recovery. (If we "return false" here, upper levels will
* assume that recovery is complete and start up the database!) It's
* essential to abort on child SIGINT and SIGQUIT, because per spec
* system() ignores SIGINT and SIGQUIT while waiting; if we see one of
* those it's a good bet we should have gotten it too.
*
* On SIGTERM, assume we have received a fast shutdown request, and exit
* cleanly. It's pure chance whether we receive the SIGTERM first, or the
* child process. If we receive it first, the signal handler will call
* proc_exit, otherwise we do it here. If we or the child process received
* SIGTERM for any other reason than a fast shutdown request, postmaster
* will perform an immediate shutdown when it sees us exiting
* unexpectedly.
*
* Per the Single Unix Spec, shells report exit status > 128 when a called
* command died on a signal. Also, 126 and 127 are used to report
* problems such as an unfindable command; treat those as fatal errors
* too.
*/
if (WIFSIGNALED(rc) && WTERMSIG(rc) == SIGTERM)
proc_exit(1);
signaled = WIFSIGNALED(rc) || WEXITSTATUS(rc) > 125;
ereport(signaled ? FATAL : DEBUG2,
(errmsg("could not restore file \"%s\" from archive: %s",
xlogfname, wait_result_to_str(rc))));