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Linux commands for network checking in Alfresco

Cesar Capillas
Cesar Capillas
Last day we wrote a little bit about basic commands to check disks
in an Alfresco installation [4].
This post is inspired in some basic network recipes and tests for an
Alfresco installation, usually in a three tier configuration composed
by three boxes. For example:
  • A – Apache Frontend
  • B – Alfresco Server
  • C – Database Server 
First checking we do is to try simple pings between the boxes via
ping -c command. A suitable network perfomance (for
is getting roundtrips (rtt) smaller than 1 ms and a
standard deviation less than 0.1 ms between Alfresco and Database
Server. This test in fact, is part of Alfresco
Environment Validation Tool (EVT)
and it
is part of Alfresco documentation
From Computer B:
$ ping -c database-server
We usually need first to check some ports, for example via nc
command [1] &
a very useful tool for checking ports, telnet usage, transfer files or
partitions, and so on. For example from Apache Web server we may want
to check if there are available 8009 and 8080 ports in Alfresco server
for reverse proxy. It is clear that all ports mentioned must be
available via local iptables (in the following example 8009 and 8080
in Alfresco Server).
From Computer A:
$ nc -v alfresco-server 8009
$ nc -v alfresco-server 8080
NOTE: You must check these ports in an Alfresco installation [3]
These ports are typical in any tomcat server. From your nagios /
icinga box, you may want to monitor JMX in Alfresco. Then you need to
enable JMX in Alfresco Server and configure JMX monitor port
(monitor.rmi.service.port=50508) defined in
And from Nagios / Icinga Box:
$ nc -v alfresco-server 50508
A network perfomance can be achieved via a combination of nc and dd
command. Last day, we used dd to test how fast our disks write. 
For example:
In Computer C (database server), we can open a socket in 12345
(this port must be opened via local iptables).
$ nc -vvlnp 12345 > /dev/null
In Computer B (application server):
$ dd if=/dev/zero bs=1M count=1K | nc -vvn database-server 12345

Connection to database-server 12345 port [tcp/*] succeeded!
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 9.11995 s, 118 MB/s
Another possibility, mentioned by Gustavo in this blog for doing
this [5] and
is via iperf (we need iperf installed in both boxes) which uses 5001
as default port 
Then on Computer C (as server – needs 5001 port):
$ iperf -s -p 5001
And on Computer B:
$ iperf -c <address of Computer C>

Client connecting to database, TCP port 5001
TCP window size: 16.0 KByte (default)
[  3] local alfresco port 37248 connected with database port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.04 GBytes    893 Mbits/sec

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