mirror of
https://github.com/samba-team/samba.git
synced 2024-12-25 23:21:54 +03:00
113 lines
3.1 KiB
HTML
113 lines
3.1 KiB
HTML
<!--#set var="TITLE" value="CTDB Testing" -->
|
|
<!--#include virtual="header.html" -->
|
|
|
|
<H2 align="center">Starting and testing CTDB</h2>
|
|
|
|
The CTDB log is in /var/log/log.ctdb so look in this file if something
|
|
did not start correctly.<p>
|
|
|
|
You can ensure that ctdb is running on all nodes using
|
|
<pre>
|
|
onnode all service ctdb start
|
|
</pre>
|
|
Verify that the CTDB daemon started properly. There should normally be at least 2 processes started for CTDB, one for the main daemon and one for the recovery daemon.
|
|
<pre>
|
|
onnode all pidof ctdbd
|
|
</pre>
|
|
|
|
Once all CTDB nodes have started, verify that they are correctly
|
|
talking to each other.<p>
|
|
|
|
There should be one TCP connection from the private ip address on each
|
|
node to TCP port 4379 on each of the other nodes in the cluster.
|
|
<pre>
|
|
onnode all netstat -tn | grep 4379
|
|
</pre>
|
|
|
|
|
|
<h2>Automatically restarting CTDB</h2>
|
|
|
|
If you wish to cope with software faults in ctdb, or want ctdb to
|
|
automatically restart when an administration kills it, then you may
|
|
wish to add a cron entry for root like this:
|
|
|
|
<pre>
|
|
* * * * * /etc/init.d/ctdb cron > /dev/null 2>&1
|
|
</pre>
|
|
|
|
|
|
<h2>Testing CTDB</h2>
|
|
|
|
Once your cluster is up and running, you may wish to know how to test that it is functioning correctly. The following tests may help with that
|
|
|
|
<h3>The ctdb tool</h3>
|
|
|
|
The ctdb package comes with a utility called ctdb that can be used to
|
|
view the behaviour of the ctdb cluster.<p>
|
|
|
|
If you run it with no options it will provide some terse usage information. The most commonly used commands are:
|
|
<pre>
|
|
ctdb status
|
|
ctdb ip
|
|
ctdb ping
|
|
</pre>
|
|
|
|
<h3>ctdb status</h3>
|
|
|
|
The status command provides basic information about the cluster and the status of the nodes. when you run it you will get some output like:
|
|
|
|
<pre>
|
|
<strong>Number of nodes:4
|
|
vnn:0 10.1.1.1 OK (THIS NODE)
|
|
vnn:1 10.1.1.2 OK
|
|
vnn:2 10.1.1.3 OK
|
|
vnn:3 10.1.1.4 OK</strong>
|
|
Generation:1362079228
|
|
Size:4
|
|
hash:0 lmaster:0
|
|
hash:1 lmaster:1
|
|
hash:2 lmaster:2
|
|
hash:3 lmaster:3
|
|
<strong>Recovery mode:NORMAL (0)</strong>
|
|
Recovery master:0
|
|
</pre>
|
|
|
|
The important parts are in bold. This tells us that all 4 nodes are in
|
|
a healthy state.<p>
|
|
|
|
It also tells us that recovery mode is normal, which means that the
|
|
cluster has finished a recovery and is running in a normal fully
|
|
operational state.<p>
|
|
|
|
Recovery state will briefly change to "RECOVERY" when there ahs been a
|
|
node failure or something is wrong with the cluster.<p>
|
|
|
|
If the cluster remains in RECOVERY state for very long (many seconds)
|
|
there might be something wrong with the configuration. See
|
|
/var/log/log.ctdb.
|
|
|
|
<h3>ctdb ip</h3>
|
|
|
|
This command prints the current status of the public ip addresses and which physical node is currently serving that ip.
|
|
|
|
<pre>
|
|
Number of nodes:4
|
|
192.168.1.1 0
|
|
192.168.1.2 1
|
|
192.168.2.1 2
|
|
192.168.2.1 3
|
|
</pre>
|
|
|
|
<h3>ctdb ping</h3>
|
|
this command tries to "ping" each of the CTDB daemons in the cluster.
|
|
<pre>
|
|
ctdb ping -n all
|
|
|
|
response from 0 time=0.000050 sec (13 clients)
|
|
response from 1 time=0.000154 sec (27 clients)
|
|
response from 2 time=0.000114 sec (17 clients)
|
|
response from 3 time=0.000115 sec (59 clients)
|
|
</pre>
|
|
|
|
<!--#include virtual="footer.html" -->
|