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Full Discussion: Lsyncd Configuration
Top Forums UNIX for Beginners Questions & Answers Lsyncd Configuration Post 303038591 by stomp on Friday 6th of September 2019 04:54:45 PM
Old 09-06-2019
I used lsyncd to migrate(p2v) servers to minimize downtime when migrating. Had lot's of files(1K-1M).

Like plain rsync it's good for a lot of things. It's very bad for syncing big files which change often(-> big database files), because lsyncd will constantly syncing those big files if only one byte changes. ( I had ~100 smaller mysql databases on some server. This worked fine.)

Worked like charm. You can apply rsync args with rsync/_extra:

Code:
sync {
    default.rsync,
    source    = "/",
    target    = "1.2.3.42:/disk/",
    exclude   = {
                "/proc/**",
                "/sys/**",
                "/dev/**"
                },
    rsync     = {
        archive  = true,
        _extra  = { "-v", "-H", "--numeric-ids" }
    }
}

Update:
Since you copy files from nfs to nfs I recommend to check disabling the Delta-Transfer with -W.

If not lsyncd/rsync will read the whole file from the source-nfs before transferring the 5 (Bytes? MBytes? GBytes?) that have changed.


The above is default, when - like in this case - both source and target path are local(begin with /).

If you have so many files and access it via nfs the initial phase is of course taking long. (I had backup issues of servers with 4-8 million files, took 10-30 hours for an rsync backup to take place even if little changed - and that was with a local source). This should be either with lsyncd or rsync. But I'm curious if plain rsync is faster.

If you just have vanishing many files, this should not cause heavy load.

I think there's not so much difference between lsyncd and rsync. Because the former is just like a wrapper of the latter.

Last edited by stomp; 09-07-2019 at 09:09 AM..
 

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rsync_selinux(8)					rsync Selinux Policy documentation					  rsync_selinux(8)

NAME
rsync_selinux - Security Enhanced Linux Policy for the rsync daemon DESCRIPTION
Security-Enhanced Linux secures the rsync server via flexible mandatory access control. FILE_CONTEXTS SELinux requires files to have an extended attribute to define the file type. Policy governs the access daemons have to these files. If you want to share files using the rsync daemon, you must label the files and directories public_content_t. So if you created a special directory /var/rsync, you would need to label the directory with the chcon tool. chcon -t public_content_t /var/rsync To make this change permanent (survive a relabel), use the semanage command to add the change to file context configuration: semanage fcontext -a -t public_content_t "/var/rsync(/.*)?" This command adds the following entry to /etc/selinux/POLICYTYPE/contexts/files/file_contexts.local: /var/rsync(/.*)? system_u:object_r:publix_content_t:s0 Run the restorecon command to apply the changes: restorecon -R -v /var/rsync/ SHARING FILES
If you want to share files with multiple domains (Apache, FTP, rsync, Samba), you can set a file context of public_content_t and pub- lic_content_rw_t. These context allow any of the above domains to read the content. If you want a particular domain to write to the pub- lic_content_rw_t domain, you must set the appropriate boolean. allow_DOMAIN_anon_write. So for rsync you would execute: setsebool -P allow_rsync_anon_write=1 BOOLEANS
system-config-selinux is a GUI tool available to customize SELinux policy settings. AUTHOR
This manual page was written by Dan Walsh <dwalsh@redhat.com>. SEE ALSO
selinux(8), rsync(1), chcon(1), setsebool(8), semanage(8) dwalsh@redhat.com 17 Jan 2005 rsync_selinux(8)
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