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https://github.com/pgbackrest/pgbackrest.git
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18fd25233b
* The repo-path option now always refers to the repository where backups and archive are stored, whether local or remote, so the repo-remote-path option has been removed. The new spool-path option can be used to define a location for queueing WAL segments when archiving asynchronously. Otherwise, a local repository is no longer required. * Implemented a new config format which should be far simpler to use. See the User Guide and Configuration Reference for details but for a simple configuration all options can now be placed in the stanza section. Options that are shared between stanzas can be placed in the [global] section. More complex configurations can still make use of command sections though this should be a rare use case. * The default configuration filename is now pgbackrest.conf instead of pg_backrest.conf. This was done for consistency with other naming changes but also to prevent old config files from being loaded accidentally. * The default repository name was changed from /var/lib/backup to /var/lib/pgbackrest. * Lock files are now stored in /tmp/pgbackrest by default. These days /run/pgbackrest would be the preferred location but that would require init scripts which are not part of this release. The lock-path option can be used to configure the lock directory. * Log files are now stored in /var/log/pgbackrest by default and no longer have the date appended so they can be managed with logrotate. The log-path option can be used to configure the lock directory. * Executable filename changed from pg_backrest to pgbackrest.
439 lines
17 KiB
Perl
439 lines
17 KiB
Perl
####################################################################################################################################
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# EXPIRE MODULE
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####################################################################################################################################
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package pgBackRest::Expire;
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use threads;
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use strict;
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use warnings FATAL => qw(all);
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use Carp qw(confess);
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use Exporter qw(import);
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use File::Basename qw(dirname);
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use File::Path qw(remove_tree);
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use Scalar::Util qw(looks_like_number);
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use lib dirname($0);
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use pgBackRest::Common::Exception;
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use pgBackRest::Common::Log;
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use pgBackRest::BackupCommon;
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use pgBackRest::BackupInfo;
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use pgBackRest::Config::Config;
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use pgBackRest::File;
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use pgBackRest::FileCommon;
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use pgBackRest::Manifest;
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####################################################################################################################################
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# Operation constants
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####################################################################################################################################
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use constant OP_EXPIRE => 'Expire';
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use constant OP_EXPIRE_DESTROY => OP_EXPIRE . '->DESTROY';
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use constant OP_EXPIRE_NEW => OP_EXPIRE . '->new';
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use constant OP_EXPIRE_PROCESS => OP_EXPIRE . '->process';
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####################################################################################################################################
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# new
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####################################################################################################################################
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sub new
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{
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my $class = shift;
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# Create the class hash
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my $self = {};
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bless $self, $class;
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# Assign function parameters, defaults, and log debug info
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my ($strOperation) = logDebugParam(OP_EXPIRE_NEW);
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# Initialize file object
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$self->{oFile} = new pgBackRest::File
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(
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optionGet(OPTION_STANZA),
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optionGet(OPTION_REPO_PATH),
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optionRemoteType(),
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protocolGet()
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);
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# Initialize total archive expired
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$self->{iArchiveExpireTotal} = 0;
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# Return from function and log return values if any
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return logDebugReturn
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(
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$strOperation,
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{name => 'self', value => $self}
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);
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}
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####################################################################################################################################
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# DESTROY
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####################################################################################################################################
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sub DESTROY
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{
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my $self = shift;
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# Assign function parameters, defaults, and log debug info
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my
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(
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$strOperation
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) =
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logDebugParam
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(
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OP_EXPIRE_DESTROY
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);
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undef($self->{oFile});
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# Return from function and log return values if any
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return logDebugReturn
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(
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$strOperation
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);
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}
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####################################################################################################################################
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# logExpire
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#
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# Tracks which archive logs have been removed and provides log messages when needed.
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####################################################################################################################################
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sub logExpire
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{
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my $self = shift;
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my $strArchiveFile = shift;
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if (defined($strArchiveFile))
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{
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if (!defined($self->{strArchiveExpireStart}))
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{
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$self->{strArchiveExpireStart} = $strArchiveFile;
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$self->{strArchiveExpireStop} = $strArchiveFile;
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}
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else
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{
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$self->{strArchiveExpireStop} = $strArchiveFile;
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}
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$self->{iArchiveExpireTotal}++;
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}
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else
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{
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if (defined($self->{strArchiveExpireStart}))
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{
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&log(INFO, 'remove archive: start = ' . substr($self->{strArchiveExpireStart}, 0, 24) .
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', stop = ' . substr($self->{strArchiveExpireStop}, 0, 24));
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}
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undef($self->{strArchiveExpireStart});
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}
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}
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####################################################################################################################################
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# process
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#
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# Removes expired backups and archive logs from the backup directory. Partial backups are not counted for expiration, so if full
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# or differential retention is set to 2, there must be three complete backups before the oldest one can be deleted.
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####################################################################################################################################
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sub process
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{
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my $self = shift;
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# Assign function parameters, defaults, and log debug info
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my
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(
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$strOperation
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) =
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logDebugParam
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(
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OP_EXPIRE_PROCESS
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);
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my @stryPath;
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my $oFile = $self->{oFile};
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my $strBackupClusterPath = $oFile->pathGet(PATH_BACKUP_CLUSTER);
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my $iFullRetention = optionGet(OPTION_RETENTION_FULL, false);
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my $iDifferentialRetention = optionGet(OPTION_RETENTION_DIFF, false);
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my $strArchiveRetentionType = optionGet(OPTION_RETENTION_ARCHIVE_TYPE, false);
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my $iArchiveRetention = optionGet(OPTION_RETENTION_ARCHIVE, false);
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# Load or build backup.info
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my $oBackupInfo = new pgBackRest::BackupInfo($oFile->pathGet(PATH_BACKUP_CLUSTER));
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# Find all the expired full backups
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if (defined($iFullRetention))
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{
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# Make sure iFullRetention is valid
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if (!looks_like_number($iFullRetention) || $iFullRetention < 1)
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{
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confess &log(ERROR, 'retention-full must be a number >= 1');
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}
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@stryPath = $oBackupInfo->list(backupRegExpGet(true));
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if (@stryPath > $iFullRetention)
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{
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# Expire all backups that depend on the full backup
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for (my $iFullIdx = 0; $iFullIdx < @stryPath - $iFullRetention; $iFullIdx++)
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{
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my @stryRemoveList;
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foreach my $strPath ($oBackupInfo->list('^' . $stryPath[$iFullIdx] . '.*'))
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{
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$oBackupInfo->delete($strPath);
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if ($strPath ne $stryPath[$iFullIdx])
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{
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push(@stryRemoveList, $strPath);
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}
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}
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&log(INFO, 'expire full backup ' . (@stryRemoveList > 0 ? 'set: ' : '') . $stryPath[$iFullIdx] .
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(@stryRemoveList > 0 ? ', ' . join(', ', @stryRemoveList) : ''));
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}
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}
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}
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# Find all the expired differential backups
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if (defined($iDifferentialRetention))
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{
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# Make sure iDifferentialRetention is valid
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if (!looks_like_number($iDifferentialRetention) || $iDifferentialRetention < 1)
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{
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confess &log(ERROR, 'retention-diff must be a number >= 1');
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}
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@stryPath = $oBackupInfo->list(backupRegExpGet(false, true));
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if (@stryPath > $iDifferentialRetention)
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{
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for (my $iDiffIdx = 0; $iDiffIdx < @stryPath - $iDifferentialRetention; $iDiffIdx++)
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{
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# Get a list of all differential and incremental backups
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my @stryRemoveList;
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foreach my $strPath ($oBackupInfo->list(backupRegExpGet(false, true, true)))
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{
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logDebugMisc($strOperation, "checking ${strPath} for differential expiration");
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# Remove all differential and incremental backups before the oldest valid differential
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if ($strPath lt $stryPath[$iDiffIdx + 1])
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{
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$oBackupInfo->delete($strPath);
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if ($strPath ne $stryPath[$iDiffIdx])
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{
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push(@stryRemoveList, $strPath);
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}
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}
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}
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&log(INFO, 'expire diff backup ' . (@stryRemoveList > 0 ? 'set: ' : '') . $stryPath[$iDiffIdx] .
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(@stryRemoveList > 0 ? ', ' . join(', ', @stryRemoveList) : ''));
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}
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}
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}
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$oBackupInfo->save();
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# Remove backups from disk
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foreach my $strBackup ($oFile->list(PATH_BACKUP_CLUSTER, undef, backupRegExpGet(true, true, true), 'reverse'))
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{
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if (!$oBackupInfo->current($strBackup))
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{
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&log(INFO, "remove expired backup ${strBackup}");
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remove_tree("${strBackupClusterPath}/${strBackup}") > 0
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or confess &log(ERROR, "unable to remove backup ${strBackup}", ERROR_PATH_REMOVE);
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}
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}
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# Default archive retention if not explicily set
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if (defined($iFullRetention))
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{
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if (!defined($iArchiveRetention))
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{
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$iArchiveRetention = $iFullRetention;
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}
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if (!defined($strArchiveRetentionType))
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{
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$strArchiveRetentionType = BACKUP_TYPE_FULL;
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}
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}
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# If no archive retention type is set then exit
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if (!defined($strArchiveRetentionType))
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{
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&log(INFO, 'archive retention type not set - archive logs will not be expired');
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}
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else
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{
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# Determine which backup type to use for archive retention (full, differential, incremental)
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if ($strArchiveRetentionType eq BACKUP_TYPE_FULL)
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{
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@stryPath = $oBackupInfo->list(backupRegExpGet(true), 'reverse');
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}
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elsif ($strArchiveRetentionType eq BACKUP_TYPE_DIFF)
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{
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@stryPath = $oBackupInfo->list(backupRegExpGet(true, true), 'reverse');
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}
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elsif ($strArchiveRetentionType eq BACKUP_TYPE_INCR)
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{
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@stryPath = $oBackupInfo->list(backupRegExpGet(true, true, true), 'reverse');
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}
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# if no backups were found then preserve current archive logs - too soon to expire them
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my $iBackupTotal = scalar @stryPath;
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if ($iBackupTotal > 0)
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{
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# See if enough backups exist for expiration to start
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my $strArchiveRetentionBackup = $stryPath[$iArchiveRetention - 1];
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if (!defined($strArchiveRetentionBackup))
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{
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if ($strArchiveRetentionType eq BACKUP_TYPE_FULL && scalar @stryPath > 0)
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{
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&log(INFO, "full backup total < ${iArchiveRetention} - using oldest full backup for archive retention");
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$strArchiveRetentionBackup = $stryPath[scalar @stryPath - 1];
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}
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}
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# If a backup has been selected for retention then continue
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if (defined($strArchiveRetentionBackup))
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{
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my $bRemove;
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# Only expire if the selected backup has archive info - backups performed with --no-online will
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# not have archive info and cannot be used for expiration.
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if ($oBackupInfo->test(INFO_BACKUP_SECTION_BACKUP_CURRENT,
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$strArchiveRetentionBackup, INFO_BACKUP_KEY_ARCHIVE_START))
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{
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# Get archive info
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my $oArchive = new pgBackRest::Archive();
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my $strArchiveId = $oArchive->getCheck($oFile);
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my $strArchiveExpireMax;
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# Get archive ranges to preserve. Because archive retention can be less than total retention it is
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# important to preserve older archive that is required to make the older backups consistent even though
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# they cannot be played any further forward with PITR.
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my @oyArchiveRange;
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foreach my $strBackup ($oBackupInfo->list())
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{
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if ($strBackup le $strArchiveRetentionBackup &&
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$oBackupInfo->test(INFO_BACKUP_SECTION_BACKUP_CURRENT, $strBackup, INFO_BACKUP_KEY_ARCHIVE_START))
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{
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my $oArchiveRange = {};
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$$oArchiveRange{start} = $oBackupInfo->get(INFO_BACKUP_SECTION_BACKUP_CURRENT,
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$strBackup, INFO_BACKUP_KEY_ARCHIVE_START);
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if ($strBackup ne $strArchiveRetentionBackup)
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{
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$$oArchiveRange{stop} = $oBackupInfo->get(INFO_BACKUP_SECTION_BACKUP_CURRENT,
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$strBackup, INFO_BACKUP_KEY_ARCHIVE_STOP);
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}
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else
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{
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$strArchiveExpireMax = $$oArchiveRange{start};
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}
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&log(INFO, "archive retention on backup ${strBackup}, start = $$oArchiveRange{start}" .
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(defined($$oArchiveRange{stop}) ? ", stop = $$oArchiveRange{stop}" : ''));
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push(@oyArchiveRange, $oArchiveRange);
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}
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}
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# Get all major archive paths (timeline and first 64 bits of LSN)
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foreach my $strPath ($oFile->list(PATH_BACKUP_ARCHIVE, $strArchiveId, "^[0-F]{16}\$"))
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{
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logDebugMisc($strOperation, "found major WAL path: ${strPath}");
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$bRemove = true;
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# Keep the path if it falls in the range of any backup in retention
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foreach my $oArchiveRange (@oyArchiveRange)
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{
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if ($strPath ge substr($$oArchiveRange{start}, 0, 16) &&
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(!defined($$oArchiveRange{stop}) || $strPath le substr($$oArchiveRange{stop}, 0, 16)))
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{
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$bRemove = false;
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last;
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}
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}
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# Remove the entire directory if all archive is expired
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if ($bRemove)
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{
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my $strFullPath = $oFile->pathGet(PATH_BACKUP_ARCHIVE, $strArchiveId) . "/${strPath}";
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remove_tree($strFullPath) > 0
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or confess &log(ERROR, "unable to remove ${strFullPath}", ERROR_PATH_REMOVE);
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# Log expire info
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logDebugMisc($strOperation, "remove major WAL path: ${strFullPath}");
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$self->logExpire($strPath);
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}
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# Else delete individual files instead if the major path is less than or equal to the most recent retention
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# backup. This optimization prevents scanning though major paths that could not possibly have anything to
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# expire.
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elsif ($strPath le substr($strArchiveExpireMax, 0, 16))
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{
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# Look for files in the archive directory
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foreach my $strSubPath ($oFile->list(PATH_BACKUP_ARCHIVE,
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"${strArchiveId}/${strPath}", "^[0-F]{24}.*\$"))
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{
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$bRemove = true;
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# Determine if the individual archive log is used in a backup
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foreach my $oArchiveRange (@oyArchiveRange)
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{
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if (substr($strSubPath, 0, 24) ge $$oArchiveRange{start} &&
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(!defined($$oArchiveRange{stop}) || substr($strSubPath, 0, 24) le $$oArchiveRange{stop}))
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{
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$bRemove = false;
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last;
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}
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}
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# Remove archive log if it is not used in a backup
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if ($bRemove)
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{
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fileRemove($oFile->pathGet(PATH_BACKUP_ARCHIVE, "${strArchiveId}/${strSubPath}"));
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logDebugMisc($strOperation, "remove WAL segment: ${strSubPath}");
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# Log expire info
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$self->logExpire(substr($strSubPath, 0, 24));
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}
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else
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{
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# Log that the file was not expired
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$self->logExpire();
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}
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}
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}
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}
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# Log if no archive was expired
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if ($self->{iArchiveExpireTotal} == 0)
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{
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&log(INFO, 'no archive to remove');
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}
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}
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}
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}
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}
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# Return from function and log return values if any
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return logDebugReturn
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(
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$strOperation
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);
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}
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1;
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