mirror of https://github.com/jimsalterjrs/sanoid
Merge pull request #197 from phreaker0/resumeable-replication
Resumable replication of interrupted zfs send/receive
This commit is contained in:
Jim Salter
GitHub
commit
563a93bcfe
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@ -108,6 +108,7 @@ syncoid root@remotehost:data/images/vm backup/images/vm
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Which would pull-replicate the filesystem from the remote host to the local system over an SSH tunnel.
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Syncoid supports recursive replication (replication of a dataset and all its child datasets) and uses mbuffer buffering, lzop compression, and pv progress bars if the utilities are available on the systems used.
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If ZFS supports resumeable send/receive streams on both the source and target those will be enabled as default.
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##### Syncoid Command Line Options
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@ -147,6 +148,10 @@ Syncoid supports recursive replication (replication of a dataset and all its chi
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This argument tells syncoid to restrict itself to existing snapshots, instead of creating a semi-ephemeral syncoid snapshot at execution time. Especially useful in multi-target (A->B, A->C) replication schemes, where you might otherwise accumulate a large number of foreign syncoid snapshots.
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+ --no-resume
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This argument tells syncoid to not use resumeable zfs send/receive streams.
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+ --dumpsnaps
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This prints a list of snapshots during the run.
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115
syncoid
115
syncoid
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@ -19,7 +19,7 @@ use Sys::Hostname;
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my %args = ('sshkey' => '', 'sshport' => '', 'sshcipher' => '', 'sshoption' => [], 'target-bwlimit' => '', 'source-bwlimit' => '');
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GetOptions(\%args, "no-command-checks", "monitor-version", "compress=s", "dumpsnaps", "recursive|r",
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"source-bwlimit=s", "target-bwlimit=s", "sshkey=s", "sshport=i", "sshcipher|c=s", "sshoption|o=s@",
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"debug", "quiet", "no-stream", "no-sync-snap") or pod2usage(2);
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"debug", "quiet", "no-stream", "no-sync-snap", "no-resume") or pod2usage(2);
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my %compressargs = %{compressargset($args{'compress'} || 'default')}; # Can't be done with GetOptions arg, as default still needs to be set
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@ -46,6 +46,7 @@ my $rawsourcefs = $args{'source'};
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my $rawtargetfs = $args{'target'};
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my $debug = $args{'debug'};
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my $quiet = $args{'quiet'};
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my $resume = !$args{'no-resume'};
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my $zfscmd = '/sbin/zfs';
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my $sshcmd = '/usr/bin/ssh';
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@ -161,6 +162,26 @@ sub syncdataset {
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# does the target filesystem exist yet?
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my $targetexists = targetexists($targethost,$targetfs,$targetisroot);
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my $receiveextraargs = "";
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my $receivetoken;
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if ($resume) {
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# save state of interrupted receive stream
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$receiveextraargs = "-s";
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if ($targetexists) {
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# check remote dataset for receive resume token (interrupted receive)
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$receivetoken = getreceivetoken($targethost,$targetfs,$targetisroot);
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if ($debug && defined($receivetoken)) {
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print "DEBUG: got receive resume token: $receivetoken: \n";
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}
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}
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}
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my $newsyncsnap;
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# skip snapshot checking/creation in case of resumed receive
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if (!defined($receivetoken)) {
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# build hashes of the snaps on the source and target filesystems.
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%snaps = getsnaps('source',$sourcehost,$sourcefs,$sourceisroot);
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@ -177,9 +198,8 @@ sub syncdataset {
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print "\n\n\n";
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}
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# create a new syncoid snapshot on the source filesystem.
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my $newsyncsnap;
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if (!defined $args{'no-sync-snap'}) {
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# create a new syncoid snapshot on the source filesystem.
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$newsyncsnap = newsyncsnap($sourcehost,$sourcefs,$sourceisroot);
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} else {
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# we don't want sync snapshots created, so use the newest snapshot we can find.
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@ -189,6 +209,7 @@ sub syncdataset {
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return 0;
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}
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}
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}
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my $newsyncsnapescaped = escapeshellparam($newsyncsnap);
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# there is currently (2014-09-01) a bug in ZFS on Linux
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@ -223,7 +244,7 @@ sub syncdataset {
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my $oldestsnapescaped = escapeshellparam($oldestsnap);
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my $sendcmd = "$sourcesudocmd $zfscmd send $sourcefsescaped\@$oldestsnapescaped";
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my $recvcmd = "$targetsudocmd $zfscmd receive -F $targetfsescaped";
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my $recvcmd = "$targetsudocmd $zfscmd receive $receiveextraargs -F $targetfsescaped";
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my $pvsize = getsendsize($sourcehost,"$sourcefs\@$oldestsnap",0,$sourceisroot);
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my $disp_pvsize = readablebytes($pvsize);
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@ -287,6 +308,27 @@ sub syncdataset {
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# setzfsvalue($targethost,$targetfs,$targetisroot,'readonly',$originaltargetreadonly);
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}
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} else {
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# resume interrupted receive if there is a valid resume $token
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# and because this will ony resume the receive to the next
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# snapshot, do a normal sync after that
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if (defined($receivetoken)) {
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my $sendcmd = "$sourcesudocmd $zfscmd send -t $receivetoken";
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my $recvcmd = "$targetsudocmd $zfscmd receive $receiveextraargs -F $targetfsescaped";
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my $pvsize = getsendsize($sourcehost,"","",$sourceisroot,$receivetoken);
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my $disp_pvsize = readablebytes($pvsize);
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if ($pvsize == 0) { $disp_pvsize = "UNKNOWN"; }
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my $synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
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if (!$quiet) { print "Resuming interrupted zfs send/receive from $sourcefs to $targetfs (~ $disp_pvsize remaining):\n"; }
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if ($debug) { print "DEBUG: $synccmd\n"; }
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system("$synccmd") == 0
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or die "CRITICAL ERROR: $synccmd failed: $?";
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# a resumed transfer will only be done to the next snapshot,
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# so do an normal sync cycle
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return syncdataset($sourcehost, $sourcefs, $targethost, $targetfs);
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}
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# find most recent matching snapshot and do an -I
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# to the new snapshot
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@ -327,7 +369,7 @@ sub syncdataset {
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}
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my $sendcmd = "$sourcesudocmd $zfscmd send $args{'streamarg'} $sourcefsescaped\@$matchingsnapescaped $sourcefsescaped\@$newsyncsnapescaped";
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my $recvcmd = "$targetsudocmd $zfscmd receive -F $targetfsescaped";
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my $recvcmd = "$targetsudocmd $zfscmd receive $receiveextraargs -F $targetfsescaped";
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my $pvsize = getsendsize($sourcehost,"$sourcefs\@$matchingsnap","$sourcefs\@$newsyncsnap",$sourceisroot);
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my $disp_pvsize = readablebytes($pvsize);
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if ($pvsize == 0) { $disp_pvsize = "UNKNOWN"; }
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@ -417,6 +459,8 @@ sub checkcommands {
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$avail{'localmbuffer'} = 1;
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$avail{'sourcembuffer'} = 1;
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$avail{'targetmbuffer'} = 1;
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$avail{'sourceresume'} = 1;
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$avail{'targetresume'} = 1;
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return %avail;
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}
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@ -524,6 +568,37 @@ sub checkcommands {
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$avail{'localpv'} = 1;
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}
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# check for ZFS resume feature support
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if ($resume) {
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my $resumechkcmd = "$zfscmd get receive_resume_token -d 0";
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if ($debug) { print "DEBUG: checking availability of zfs resume feature on source...\n"; }
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$avail{'sourceresume'} = system("$sourcessh $resumechkcmd >/dev/null 2>&1");
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$avail{'sourceresume'} = $avail{'sourceresume'} == 0 ? 1 : 0;
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if ($debug) { print "DEBUG: checking availability of zfs resume feature on target...\n"; }
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$avail{'targetresume'} = system("$targetssh $resumechkcmd >/dev/null 2>&1");
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$avail{'targetresume'} = $avail{'targetresume'} == 0 ? 1 : 0;
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if ($avail{'sourceresume'} == 0 || $avail{'targetresume'} == 0) {
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# disable resume
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$resume = '';
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my @hosts = ();
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if ($avail{'sourceresume'} == 0) {
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push @hosts, 'source';
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}
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if ($avail{'targetresume'} == 0) {
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push @hosts, 'target';
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}
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my $affected = join(" and ", @hosts);
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print "WARN: ZFS resume feature not available on $affected machine - sync will continue without resume support.\n";
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}
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} else {
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$avail{'sourceresume'} = 0;
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$avail{'targetresume'} = 0;
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}
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return %avail;
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}
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@ -932,7 +1007,7 @@ sub getsnaps() {
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sub getsendsize {
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my ($sourcehost,$snap1,$snap2,$isroot) = @_;
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my ($sourcehost,$snap1,$snap2,$isroot,$receivetoken) = @_;
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my $snap1escaped = escapeshellparam($snap1);
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my $snap2escaped = escapeshellparam($snap2);
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@ -958,6 +1033,12 @@ sub getsendsize {
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$snaps = "$snap1escaped";
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}
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# in case of a resumed receive, get the remaining
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# size based on the resume token
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if (defined($receivetoken)) {
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$snaps = "-t $receivetoken";
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}
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my $getsendsizecmd = "$sourcessh $mysudocmd $zfscmd send -nP $snaps";
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if ($debug) { print "DEBUG: getting estimated transfer size from source $sourcehost using \"$getsendsizecmd 2>&1 |\"...\n"; }
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@ -970,7 +1051,13 @@ sub getsendsize {
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# size of proposed xfer in bytes, but we need to remove
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# human-readable crap from it
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my $sendsize = pop(@rawsize);
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# the output format is different in case of
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# a resumed receive
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if (defined($receivetoken)) {
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$sendsize =~ s/.*\s([0-9]+)$/$1/;
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} else {
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$sendsize =~ s/^size\s*//;
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}
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chomp $sendsize;
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# to avoid confusion with a zero size pv, give sendsize
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@ -1007,6 +1094,21 @@ sub escapeshellparam {
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return "'$par'";
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}
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sub getreceivetoken() {
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my ($rhost,$fs,$isroot) = @_;
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my $token = getzfsvalue($rhost,$fs,$isroot,"receive_resume_token");
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if ($token ne '-' && $token ne '') {
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return $token;
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}
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if ($debug) {
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print "DEBUG: no receive token found \n";
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}
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return
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}
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__END__
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=head1 NAME
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@ -1044,3 +1146,4 @@ Options:
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--quiet Suppresses non-error output
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--dumpsnaps Dumps a list of snapshots during the run
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--no-command-checks Do not check command existence before attempting transfer. Not recommended
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--no-resume Don't use the ZFS resume feature if available
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