[Pacemaker] DRBD with Pacemaker on CentOs 6.5

[Lars Ellenberg]

On Tue, Nov 11, 2014 at 12:27:23PM +0800, Sihan Goi wrote:
> Hi,
> 
> DocumentRoot is still set to /var/www/html
> ls -al /var/www/html shows different things on the 2 nodes
> node01:
> 
> total 28
> drwxr-xr-x. 3 root root  4096 Nov 11 12:25 .
> drwxr-xr-x. 6 root root  4096 Jul 23 22:18 ..
> -rw-r--r--. 1 root root    50 Oct 28 18:00 index.html
> drwx------. 2 root root 16384 Oct 28 17:59 lost+found
> 
> node02 only has index.html, no lost+found, and it's a different version of
> the file.

I'm unsure if there is just a language barrier,
or if you just have not enough experience with linux in general,
or if you try to make things more complicated as they are.

Do you know
 * what a block device is?
 * what a file system is?
 * what a mount point is?
 * that a mount point may not be empty, even though it typically is?
 * what it means to mount a file system to a mount point?

Assuming you set up DRBD in a sane way,
and it is mounted on *one* node (the node where it is Primary),
then on the *other* node, where it is NOT mounted,
you will only see the mount point,
and whatever happens to be in there.

You probably should clear out the contents of that mount point,
so that you'd have an empty mount point.

Or, if you like, replace it with some "dummy" content
that clearly shows that this is the mount point,
and not the file system that is intended to be mounted there.

> Status URL is enabled in both nodes.

As for the "DocumentRoot must be a directory",
please double check for typos...


> On Oct 30, 2014 11:14 AM, "Andrew Beekhof" <andrew at beekhof.net> wrote:
> 
> >
> > > On 29 Oct 2014, at 1:01 pm, Sihan Goi <goister at gmail.com> wrote:
> > >
> > > Hi,
> > >
> > > I've never used crm_report before. I just read the man file and
> > generated a tarball from 1-2 hours before I reconfigured all the DRBD
> > related resources. I've put the tarball here -
> > https://www.dropbox.com/s/suj9pttjp403msv/unexplained-apache-failure.tar.bz2?dl=0
> > >
> > > Hope you can help figure out what I'm doing wrong. Thanks for the help!
> >
> > Oct 28 18:13:38 node02 Filesystem(WebFS)[29940]: INFO: Running start for
> > /dev/drbd/by-res/wwwdata on /var/www/html
> > Oct 28 18:13:39 node02 kernel: EXT4-fs (drbd1): mounted filesystem with
> > ordered data mode. Opts:
> > Oct 28 18:13:39 node02 crmd[9870]:   notice: process_lrm_event: LRM
> > operation WebFS_start_0 (call=164, rc=0, cib-update=298, confirmed=true) ok
> > Oct 28 18:13:39 node02 crmd[9870]:   notice: te_rsc_command: Initiating
> > action 7: start WebSite_start_0 on node02 (local)
> > Oct 28 18:13:39 node02 apache(WebSite)[30007]: ERROR: Syntax error on line
> > 292 of /etc/httpd/conf/httpd.conf: DocumentRoot must be a directory
> >
> > Is DocumentRoot still set to /var/www/html?
> > If so, what happens if you run 'ls -al /var/www/html' in a shell?
> >
> > Oct 28 18:13:39 node02 apache(WebSite)[30007]: INFO: apache not running
> > Oct 28 18:13:39 node02 apache(WebSite)[30007]: INFO: waiting for apache
> > /etc/httpd/conf/httpd.conf to come up
> >
> > Did you enable the status url?
> >
> > http://clusterlabs.org/doc/en-US/Pacemaker/1.1-plugin/html/Clusters_from_Scratch/_enable_the_apache_status_url.html


-- 
: Lars Ellenberg
: http://www.LINBIT.com | Your Way to High Availability
: DRBD, Linux-HA  and  Pacemaker support and consulting

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